Some standard content:
National Standard of the People's Republic of China
Cable Outer Sheath
Protective coverings forekeciriccablesGeneral
Subject Content and Scope of Application
GB2952.189
Replaces GB2952-82
This standard specifies the types, model compilation, structure, size, technical requirements, test methods and inspection rules of cable outer sheath. This standard applies to fixedly laid power (including oil-filled cables), communication, signal, control and other cables, and also to optical cables. For cable outer sheaths with other special requirements beyond those specified in this standard, they should be specified separately in the corresponding product standards. 2 Reference standards
GB2900.10
GB4174
GB3082
GB8815
GB2697
GB2951
GB3048
GB3682
GB1842
GB2060
SY1668
SYPi811
JB4278
3 Terms
Cable sheath
Electrical terms
Wire and cable
Tin-plated steel strip for coaxial cable
Cold-rolled steel strip for armored cable
Armor Galvanized steel strip for cable
Galvanized low-carbon steel wire for armored cable
Soft polyvinyl chloride plastic for wires and cables
Technical conditions and classification requirements for cable yarn and threadTest methods for physical and mechanical properties of wires and cablesTest methods for electrical properties of wires and cables
Test method for melt flow rate of thermoplasticsTest method for environmental stress cracking of polyethylene
Brass strip
Cable asphalt
Petroleum copper naphthenate
Black low-density polyethylene cable sheath material
Rubber plasticVerification methods for testing instruments and equipment for wires and cablesA protective covering layer covered on the outside of the metal sheath, non-metal sheath or combined sheath of the cable to protect the cable from mechanical damage and corrosion or having other special functions
Types and model compilation
4.1 Cable outer sheaths are divided into the following types:
Universal outer sheaths for metal sheathed cables;
Universal outer sheaths for non-metal sheathed cables;
Universal outer sheaths for combined sheathed cables;
Special outer sheaths for lead sheathed oil-filled cables.
Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on March 25, 1989 and implemented on January 1, 1990
4.2 Model compilation of cable outer sheaths
GB2952.1—89
4.2.1 The models of universal outer sheaths for metal sheathed cables, universal outer sheaths for non-metallic sheathed cables and universal outer sheaths for combined sheathed cables shall be indicated by Arabic numerals according to the structural order of the armor layer and the outer layer. Each numeral indicates the main material used. In general, the model consists of two digits.
4.2.2 The model of the outer sheath of the oil-filled cable in the special outer sheath of the cable shall be indicated by Arabic numerals in the structural order of the reinforcement layer, armor layer and outer sheath. Each digit indicates the main material used. In general, the model consists of three digits. The models of other special outer sheaths of cables are under consideration.
4.2.3 When the number of armor layers increases or is composed of different materials, the number of digits indicating the model of the cable outer sheath shall increase accordingly. 4.2.4 The digits indicating the main materials used in the reinforcement layer, armor layer and outer sheath and their meanings shall comply with the provisions of Table 1. Table 1
Reinforcement layer
Radial copper strip
Radial stainless steel strip
Diameter, longitudinal copper strip
Diameter, longitudinal stainless steel strip
5Structural and dimensional requirements
Armor layer
Interlocking steel strip
Double steel strip
Fine round steel wire
Coarse steel wire
Corrugated steel strip
Double aluminum or aluminum alloy strip
The structure and size of the outer sheath of various cables shall comply with the provisions of the corresponding standards. 6 Material requirements
Unless otherwise specified in the cabinet standard, the materials used for the outer sheath of various cables shall comply with the following provisions: Outer layer or outer sheath
Fiber outer sheath
Polyvinyl chloride jacket
Polyethylene jacket
6.1 The back of the ground cable shall comply with the provisions of SY1668, and other anti-corrosion coatings with equivalent effectiveness may also be used instead. The anti-corrosion mixture used for corrugated steel belt armor shall be specified separately in the relevant product standards. 6.2 Plastic belts shall generally be polyvinyl chloride belts, and other belts with equivalent effectiveness may also be used instead. The nominal thickness of the belt shall not be less than 0.2mr and not more than 0.4mm. The plastic belt shall be adapted to the operating temperature of the cable. 6.3 The armored steel belt shall be galvanized or painted for rust prevention. The steel belt for interlocking armor shall be galvanized. Corrugated armored steel belts are divided into ordinary steel belts and steel-plastic composite belts.
5.3.1 Galvanized steel strip shall comply with the provisions of GB4175.2. The weight of the zinc layer for general use shall not be less than 80g/m2, and the weight of the zinc layer for interlocking armor shall not be less than 275g/m2.
S.3.2 Painted steel strip shall comply with the provisions of Appendix A of this standard. 6.3.3 Ordinary steel strip for corrugated armored steel strip shall comply with the provisions of GB4175.1; steel-plastic composite strip shall comply with the provisions of Appendix B of this standard.
6.4 Armored steel wire shall comply with the provisions of GB3082, and generally adopts Group I coating. When required by the user, Group II coating may also be used. For thick steel wire for underwater cables, when required by the user, plastic-coated steel wire may be used, or other effective non-metallic corrosion protection layer may be applied to each thick steel wire, and its thickness shall not be less than 0.2mm and not more than 1.0mm. Plastic-coated steel wire shall comply with the provisions of Appendix C of this standard. 6.5 Polyethylene sheathing materials shall comply with the provisions of GB8815 and shall be compatible with the working environment and working temperature of the cable. Other grades of materials may be used when there are special requirements. 5.6 Polyethylene sheathing materials shall comply with the provisions of SG243; in situations where high environmental stress cracking resistance is required, the corresponding grade shall be used.
6.7 Paper shall be cable paper. Corrugated cable paper shall refer to the provisions of Appendix D of this standard. 2
GB 2952.1—89
6.8 Non-woven fabrics and non-woven linen shall refer to the provisions of Appendix E and Appendix F of this standard. 6.9 Linen shall comply with the provisions of GB2697. Linen yarn can be used for general cables, but linen thread shall be used for the outer sheath of submarine cables. 6.10 The reinforcement belt for oil-filled cables shall comply with the provisions of GB2060. Other non-magnetic metal belts with performance not lower than that specified in this standard may also be used.
6.11 Copper naphthenate shall comply with the provisions of SYB1811. Liquid petroleum copper naphthenate is allowed, and its requirements may be specified separately. 7 Process requirements
7.1 Coating
7.1.1 The cable asphalt or other anti-corrosion coating applied to the metal sheath shall have good adhesion, be uniform and complete. 7.1.2 All gaps between the corrugated steel belt longitudinal armor and the cable core, between the overlapping seams of the steel belt, and between the steel belt and the polyethylene jacket shall be filled with anti-corrosion mixture.
7.2 Metal belt armor
7.2.1 Interlocking armor shall be specially formed and interlocked. 7.2.2 Double-layer metal belt armor shall be wound in a left-hand spiral gap (S-twisted), the winding gap shall not be greater than 50% of the width of the metal belt, and the gap of the inner metal belt shall be covered by the part of the outer metal belt near the middle. 7.2.3 The longitudinal armor steel belt shall be pre-rolled into a corrugation similar to a sine wave. When a single layer of corrugated steel belt is used for longitudinal wrapping, the two sides of the steel belt should overlap, and the overlap width: for the case where the assumed diameter before armoring is 15mm or less, it should not be less than 3mm; for the case where the assumed diameter before armoring is greater than 15mm, it should not be less than 6mm. For cables with an outer diameter greater than 35mm after armoring, nylon yarn or polyester yarn of no more than 2000 denier should be wrapped around the armored steel belt, and the wrapping pitch should not be greater than 50mm. When a double layer of corrugated steel belt is used for longitudinal wrapping, the inner layer of the steel belt is longitudinally wrapped with a gap, and the gap should be between 3 and 6mm. The process of the outer layer of the steel belt is the same as that of the single layer longitudinal wrapping. The longitudinal wrapping seams of the inner and outer layers of the steel belts are not allowed to overlap, and should be in roughly opposite positions, with an angle of not less than 90°. 7.2.4·The metal belt joints must be welded, the rough surface should be repaired and leveled, and appropriate anti-corrosion treatment should be applied. 7.3 Steel wire armor
7.3.1 The steel wires should be tightly and completely wrapped on the inner lining layer, and the total spacing between the steel wires should not exceed the diameter of one steel wire. 7.3.2 The single-layer steel wire should be wrapped in the left direction (S twist); the inner layer of the double-layer steel wire should be wrapped in the right direction (Z twist) and the outer layer should be wrapped in the left direction (S twist). When the double-layer steel wire is required to be wrapped in the same direction, it should be left-handed (S twist). 7.3.3 The steel wire joints should be welded, the rough surface should be repaired and smoothed, and appropriate anti-corrosion treatment should be applied. The straight-line distance between the welding heads of two steel wires in the same layer should be not less than 1m.
7.3.4 AC single-core power cables should be armored with non-magnetic materials. When steel wire armor is used, it should be divided into at least 4 equal parts with non-magnetic materials.
7.4 Wrapping
7.4.1 Non-metallic tapes should be wrapped in overlapping layers.
7.4.2 The fiber layer should be tightly wrapped, and the fiber material of the outer layer should be firmly adhered and not naturally loose. 7.5 Extrusion
The plastic sheath should be tightly wrapped, with a rounded surface, and its cross section should be free of sand holes, inclusions and bubbles visible to the naked eye. 8 Performance requirements
8.1 Coating
8.1.1 The asphalt or other similar coatings of the fiber outer layer should not drip naturally at a temperature of 70±2°C. 8.1.2 The asphalt or other similar coatings of the fiber outer layer should not fall off when bent at a temperature of 0±2°C. 8.2 Lining
8.2.1 The extruded lining layer of the metal sheathed cable shall be subjected to a spark test without breakdown in accordance with the provisions of Article 8.3.1. 3
GB 2952.1—89
8.2.2 The insulation resistance coefficient of the wrapped lining layer of the metal sheathed cable shall not be less than 20MQ·m at 20°C. 8.2.3 The wrapped lining layer of the metal sheathed cable shall be subjected to a salt bath test and shall meet the following requirements: a. After the inner lining has been subjected to 100 thermal cycle tests, the insulation resistance R1oo (MQ2) of the inner lining measured at a temperature of 25±2℃ shall comply with the formula (1):
RrooA≥10\MQ·cm?
Wherein: A—surface area of the inner lining immersed in the salt solution, A=πDL, cm2; D—outer diameter of the inner lining, cm;
L—length of the inner lining immersed in the salt solution, cm. b. After 100 thermal cycles, the corrosion on the metal sheath shall be level 0, c. After 100 thermal cycles, the waterproof tape shall not crack when folded in half by hand at room temperature, 8.3 Outer sheath
8.3.1' Non-insulated plastic sheath on the metal sheath or non-insulated plastic sheath on the armor shall be subjected to the DC or power frequency spark test specified in Table 2 without breakdown. The time for the cable to pass through the electrode shall be sufficient to detect defects. The power frequency spark machine shall comply with the provisions of JB4278.10, Table?
Spark test type
Note: t is the nominal thickness of the corrosion-resistant sheath, mm. Test voltage
Maximum test voltage
8.3.2 For insulating plastic jackets such as plastic jackets of oil-filled cables, a DC voltage of 8kV per mm of nominal thickness of the plastic jacket shall be applied for 1 min without breakdown, and the maximum test voltage is 25kV.8.3.3 The plastic jacket on the aluminum jacket shall be subjected to a local destructive corrosion extension test. After the test, the extension of corrosion from the edge of the locally damaged plastic sheath to the outside of the aluminum sheath should not exceed 10mm. 8.3.4 Plastic jackets with a diameter of 30mm and above should be subjected to abrasion tests. After the test, there should be no cracks or cracks visible to the naked eye on the inner and outer surfaces. Insulating plastic jackets, such as oil-filled cable plastic jackets, should be subjected to voltage withstand tests in the following order without breakdown after the abrasion test:
Test: Immerse in an aqueous solution of 0.5% sodium chloride and approximately 0.1% by weight of an appropriate non-ionic surfactant at room temperature for 24h.
After that, between the plastic jackets, with the inner metal layer as the negative electrode, a DC voltage of 20kV is applied between the metal layer and the salt solution for 1min.
Between the plastic jackets, that is, between the metal layer and the salt solution The impulse test voltage specified in Table 3 is applied between solutions with positive and negative polarities. b.
Main insulation withstand nominal lightning impulse voltage peak value <380
380~<750
750~1175
1175~<1550
≥1550
8.3.5The mechanical and physical properties of the plastic sheath shall comply with the provisions of Table 4. Impact test voltage peak value
8.4The coarse steel wire joints with non-metallic corrosion protection layer shall have effective corrosion protection, and its water-immersed insulation resistance shall not be less than 1MQ4
GB2952.1—89
8.5The outer sheath of the cable shall be made of hemp, paper and various strips containing natural fiber materials, which must be treated with copper cyclopentaneate for corrosion protection. The content of copper cyclohexane in hemp, paper or natural fiber shall not be less than 3.8%. Other equally effective methods are allowed for anti-corrosion treatment. Table 4
Cable conductors to which the sheath can be applied
Maximum rated operating temperature
Before heat aging:
(1) Tensile strength, minimum
(2) Elongation at break, minimum
After heat aging:
(1) Tensile strength, minimum
Change rate , maximum
(2) elongation at break, minimum
rate of change, maximum
thermal weight loss, maximum
high temperature pressure test, maximum penetration depth
low temperature impact test
thermal shock test
melt index, unaged maximum
carbon black content, minimum
environmental stress cracking resistance, minimum
combustion test
Note: 1) In situations with high requirements.
Test method
mg/cm2
100±2×7d
80±2℃×6h
15±2C×4h
No crack
150±3×1h
No crack
No flame extension
PVC-S2
100±2×7d
100±2×7d
90± 2c×6h
-15±2℃×4h
No crack
150±3×15
No crack
No flame retardancy
Polyethylene
100±2℃×10d
24(48\)
9.1 Inspection of structure, dimensions, materials and process quality (Chapters 5, 6 and 7): It should be carried out at a distance of not less than 300mm from both ends of the cable outer sheath. Except for those with dimensions available for inspection, other provisions shall be observed visually. 9.1.1 The thickness of the extruded lining and extruded jacket shall be measured in accordance with the method specified in GB2951.3. 9.1.2 Measurement of the thickness of the wrapped inner lining layer and the fiber outer sheath: Use a paper tape and a ruler with a minimum scale value of 0.5mm to measure the circumference, then convert it into a diameter, and calculate it as half of the difference between the inner and outer diameters of the sheath. 9.1.3 Inspection of the quality of the metal tape armor layer (Articles 7.2.1 and 7.2.2): After stripping off the outer layer on the armor layer, at a distance of not less than 1m from the end, wrap the cable around a cylinder with a diameter of about 15 times the outer diameter of the cable armor layer for not less than one circle, and inspect it visually. It should meet the following requirements:
GB2952.1-89
a. When using a layer of metal tape for interlocking armor, the locking edge does not open or detach; b. When using a double layer of metal tape for wrapped armor, the wrapping gap of the lower metal tape cannot be seen. 9.1.4 Inspection of total gap of armored steel wire (Article 5.2.5): After measuring the outer diameter of armored steel wire and armor layer, calculate the number of steel wires equivalent to the total gap of armored steel wire according to the following formula:
N =(Dd)sinα
α=tg\
元(Dd)
Where: N-the number of steel wires equivalent to the total gap of armored steel wire; D-the measured outer diameter of steel wire armor layer, mm; d-the measured outer diameter of armored steel wire (including anti-corrosion layer), mm; -wire wrapping angle, (°)
N. Measured number of armored steel wires;
1. Measured wire wrapping pitch, mm.
9.1.5 Check the tightness of the plastic sheath (Article 7.6): Take a cable sample of not less than 200mm in length, open the plastic sheath, and visually observe the inner surface of the sheath. There should be marks left by the wrapping tape or armor. 9.2 Paint hot drip test (Article 8.1.1): Cut 3 samples of 300mm in length from the finished cable (for oil-paper insulated cables, both ends of the sample should be properly sealed), hang them horizontally in the oven, and cover the bottom of the oven with white paper. After 4 hours at the specified temperature, observe the paint dripping. There should be no visible paint dripping marks on the white paper at the bottom of the oven. 9.3 Paint cold resistance test (Article 8.1.2): Take a sample of appropriate length from the finished cable and place it in a freezing tank or freezing room at the specified temperature for 2 hours, and then bend it 3 times according to the method specified in GB2951.23. There should be no visible debris on the outer coating. It is allowed to take the sample out of the freezing tank or freezing room for bending test, but the time from the sample being taken out to the start of bending test shall not exceed 60s. The cold resistance test of paint is also allowed to use the paint in the paint tank used in the production process as the sample, and it shall be carried out in accordance with the "freezing bending test method" in Appendix 1 of SY1668.
9.4 Test on insulation resistance coefficient of inner lining layer of metal sheathed cable wrapping type (Section 8.2.2): The test shall be carried out on a whole cable of manufacturing length or delivery length. The tested cable shall be stored at room temperature for not less than 24 hours, and measured at room temperature with a 1000V megohmmeter or other test instruments of equivalent effectiveness. When measuring, the high voltage terminal of the megohmmeter is connected to the metal sheath, and the ground terminal is connected to the armor. The insulation resistance value at stability or 1min is read and calculated according to formula (4):
Where: M--insulation resistance value of the cable armor lining per unit length at 20℃, MQ·m; R-insulation resistance value of the armor lining measured at t℃, MQ; L-measured length of the tested cable, m;
...(4)
α-temperature conversion coefficient. The lining layer mainly made of polyvinyl chloride tape can be obtained according to Appendix G of this standard, or it can be calibrated by the manufacturer. Other materials can be taken as 1.0.
9.5 Salt bath test (Article 8.2.3): Conducted in accordance with the method specified in GB2951.26. 9.6 Spark test (Articles 8.2.1 and 8.3.1): Conducted in accordance with the method specified in GB3048.10. 9.7 DC voltage withstand test of plastic sheath of oil-filled cable (Article 8.3.2): The test shall be conducted on a whole cable drum of manufacturing length or delivery length. The metal layer under the plastic sheath (such as reinforcement layer or armor layer) is used as the negative electrode, and the outer electrode is grounded. The outer electrode can be a semi-conductive graphite coating or water, that is, the whole cable drum is immersed in water. 9.8 Corrosion extension test (Article 8.3.3): Carry out according to the method specified in GB2951.27. 9.9 Scrape test (Article 8.3.4): Carry out according to the method specified in GB2951.28. 6
GB2952.189
Plastic sleeve mechanical and physical properties test (Article 8.3.5): Carry out according to the corresponding methods specified in GB2951, GB3682 and GB1842. 9.10
9.11 Anti-corrosion thick steel wire joint immersion test (Article 8.4): Take no less than 3 specimens with joints in the middle of appropriate length. Immerse the joint part of the specimen in a 0.5% sodium nitride solution with a depth of not less than 100mm, with the end of the specimen exposed to the liquid surface. After 24 hours at 20 ± 5, use a 1000V megohmmeter or other insulation test instrument with equivalent performance to test the insulation resistance between the steel wire and the salt solution. 9.12 Determination of naphthenate copper content or anti-corrosion treatment effect (Article 8.5): Conduct according to the method specified in GB2951.24 or GB2951.25.
10 Inspection rules
The cable outer sheath shall be inspected by the manufacturer's quality inspection department according to Table 5 for factory inspection (R) and type inspection (T). Table 5
Structure, size, material and process quality inspection Paint hot drip test
Coating cold resistance test
Insulation resistance coefficient test of inner lining
Salt bath test
Spark test
DC voltage resistance test
Corrosion extension test
Scrape test
Tensile strength and elongation at break test
Heat aging test
Heat weight loss test|| tt||High overflow pressure test
Low temperature impact test
Thermal shock test
Melt index determination
Carbon black content determination
Environmental stress cracking resistance test
Combustion test
Immersion test for corrosion-resistant thick steel wire joints
Copper cyclohexaneate blood content determination or anaerobicity
Bacterial corrosion test
10.2 Factory inspection
Article number
Chapter 5, 6, 7
Article 8.1.1
Article 8.1.2
Article 8.2.2
Article 8 .2.3
Article 8.2.1 and
Article 8.3.1
Article 8.3.2
Article 8.3.3
Article 8.3.4
Article 8.3.5
Article 8.3.5
Article 8.3.5
Article 8.3.5
Article 8.3.5
Article 8.3.5
Article 8.3.5
Article 8.3.5
Article 8.3.5
Article 8.3.5
Article 8.3.5
Article 8.3.5
Article 8.3.5
Article 8.3.5
Article 8.3. 4 Articles
Article 8.3.5
Inspection rules
Test methods
GB2951.3 and Article 9.1 of this standard
Article 9.2 of this standard
Article 9.3 of this standard
Article 9.4 of this standard
GB2951.26
GB3048.10
Article 9.7 of this standard
GB2951.27
GB2951.28
GB2951.11
GB2951.17
GB 2951.14
GB2951
GB3682
GB2951.36
GB1842
GB2951.19
Article 9.11 of this standard
GB2951.24 or GB2951.25
10.2.1 Factory inspection must be carried out on the outer sheath of each manufactured length or delivered length. 10.2.2 If one item of factory inspection fails, the outer sheath of the cable is considered a defective product. 10.2.3 It is allowed to repair the defective products and conduct factory inspection again. 10.3 Type inspection
10.3.1 Type inspection must be carried out in the following cases: new products or old products are transferred to the factory for trial production and identification; a.
GB2952.1-89
b. When there are major changes in structure, materials, and processes that may affect product performance; c. In normal production, sampling inspection is carried out once a year (item 5 in Table 5 is sampled and inspected once every three years); d. When production is resumed after more than one year of suspension; when the national quality supervision agency proposes a requirement for type inspection. c.
10.3.2 Type inspection is carried out on cables with the same type of outer sheath but different reel numbers. Randomly take 3 samples for type inspection. If one or more samples fail the test results, double the sample on the outer sheath of the same type of cable and retest. If one or more samples still fail, the type inspection items sampled shall be judged as unqualified. 10.3.3 The outer sheath of the cable that fails the type inspection is a defective product. It must be qualified before it can be put into formal production. A1 Scope of application
GB2952.1-89
Appendix A
Painted steel strip
(Supplement)
The painted steel strip specified in this appendix is applicable to the armor of the cable. Note: It is not applicable to bare armor. bzxz.net
A2 Models, specifications and dimensions
A2.1 The model of the painted steel strip is QG.
A2.2 The specifications and dimensions of the painted steel strip shall comply with the provisions of GB4175.1. For example, the marking of the painted steel strip for armored cables with a thickness of 0.5mm and a width of 35mm is QG-0.5×3.5--GB2952.1 Appendix A
A3 Technical requirements
A3.1 The strip base for the painted steel strip shall comply with the provisions of GB4175.1. A3.2 The paint film quality of the painted steel strip shall comply with the provisions of Table A1. A4 Acceptance rules
A4.1 Painted steel strips shall be accepted in batches, and each batch shall consist of painted steel strips of the same model, size and delivery status. A4.2
Each drum of painted steel strip shall be inspected for size and appearance. In addition, other items shall be inspected by sampling, and the sampling method is as follows.
Inspection.
Painted steel strip base is sampled according to GB247 "Acceptance, packaging, marking and quality certification of steel plates and steel strips-General provisions" Table A1
Thickness μm (single side)
Bending test. 5, times
Impact test
N·cm1 time
Steel strip thickness <0.5mm
Steel strip thickness ≥0.5mm
Corrosion resistance test 20±5℃, 24h
Heat resistance test 200±5℃, 0.5h
Low temperature resistance test -20±5℃, 2h
Uniform and continuous, slight sagging and scratches are allowed, but no large pieces fall off or missing coating
≥100
≥300
Test method
Visual inspection
Article A5.2
Article A5.3
Article A5.4
Article A5.5
Article A5.6
Article A5.7
For the bending test and impact test of the paint film of the painted steel strip, 5% of the strips (but not less than 5 strips) shall be randomly selected from the painted steel strips that have passed the strip base inspection and the paint film appearance and thickness inspection, and then a sample shall be taken from the inner and outer ends of each strip for testing. A4.2.3The corrosion resistance test, heat resistance test and low temperature resistance test of the paint film of the painted steel strip are type test items. The number of samples for each test shall not be less than 3. Type tests are only carried out when the product is finalized or the material formula and process are changed. However! It should be used as a quality assurance item. 9
GB2952.1—89
A4.2.4If the sampling test fails, the unqualified item shall be re-inspected by randomly selecting double the number of samples from the untested steel strip reels; if the re-inspection still fails, the unqualified items shall be inspected one by one to remove the unqualified products. A5 Test method
A5.1 The strip base for painted steel strips shall be tested in accordance with the provisions of GB4175.1. A5.2 The paint film thickness of the painted steel strip shall be measured with an EQR-7504 coating thickness gauge (measuring range 0~15um, accuracy ±5%) or other measuring instruments of equal accuracy. The measuring part shall be no less than 3mm from the edge. Measure 3 points on each side at approximately equal intervals on a painted steel strip with a length of no less than 100mm. The arithmetic mean of 6 test data is taken as the paint film thickness value of the painted steel strip. A5.3 The paint film bending test of the painted steel strip is to take a sample of appropriate length and conduct it on a QGW801 bending instrument or other equivalent bending equipment. The test bending diameter shall be 5.0±0.2mm, with forward and reverse bending as 1 time. After the prescribed number of bendings, the paint film shall be visually observed to be qualified if it does not peel or crack.
A5.4 The impact test of the paint film of the painted steel strip is carried out by taking a sample of appropriate size on a DHC802 impact instrument or other equivalent impact equipment. The radius of curvature of the punch is 4.0±0.1mm. After the test according to the specified impact momentum and number of times, the paint film on the convex part of the sample is not peeled or cracked by visual observation. A5.5 The corrosion resistance test of the paint film of the painted steel strip is divided into three items: acid resistance, alkali resistance and salt resistance. It is carried out as follows: A5.5.1 Preparation of test solution
a. 5% hydrochloric acid solution---chemically pure hydrochloric acid, specific gravity about 1.18) 42.4mL add 950niL of distilled water. b. 5% sodium hydroxide solution-sodium hydroxide (chemically pure) 50g add 950mL of distilled water. c. 5% sodium chloride solution --- sodium chloride (chemically pure) 50g plus distilled water 950mL. A5.5.2 Test steps
a. Take a painted steel strip of about 50mm in length as the test sample, and do not seal the cut edge. b. Place the sample flat in an appropriate uncovered glass container (one sample per container), then add about 50mL of test solution, so that the sample is immersed in the test solution during the test time. After the specified temperature and time, take out the sample and observe the changes in the paint film by force. c.
A5.5.3 Qualified indicators
The test results shall be evaluated according to Table A2.
5% hydrochloric acid solution
5% sodium cyanide solution
5% sodium chloride solution
Qualified index
The paint film is intact, but the paint film is allowed to peel off no more than 30% of the total area of the sample, and small bubbles on the surface are not counted. The paint film is intact, and only the paint film on the shear edge is allowed to peel off slightly by no more than 5mm. The paint film is intact, and only the paint film on the shear edge is allowed to peel off slightly by no more than 5mm. A5.6 The heat resistance test of the paint film of the painted steel strip is to separate the samples and place them flat in an oven at a specified temperature. After the specified time, take out the samples and cool them to room temperature. Then, the samples are bent once according to the test method of Article A5.3. The paint film is considered qualified if it does not peel or crack. However, the paint film peeling or cracking within 3mm from the edge is allowed to be ignored. A5.7 The low-temperature test of the paint film of the painted steel strip is to separate the samples and place them flat in a refrigerator at a specified temperature. After the specified time test, take out the samples and restore them to room temperature. Then, the sample is subjected to a bending test once according to the test method of Article A5.3. The sample is qualified if the paint film does not peel or crack visually. However, the paint film peeling or cracking within 3mm from the edge can be ignored. A6 Packaging and marking
A6.1 Painted steel strips shall be delivered in rolls. The inner diameter of each roll of painted steel strip shall be 200±5mm, and the outer diameter shall be 630+10mm, which can also be determined according to the agreement between the supplier and the buyer.
GB 2952.1-89
A6.2 Each roll of painted steel strip shall consist of one strip, and no more than 3 joints painted after electric welding are allowed. The joints shall be free of defects such as sharp corners, slag, perforation, dislocation, etc. The tensile strength of the welded joint shall be not less than 300N/mm (measured based on the original strip base cross-section). A6.3 Each roll of painted steel strip shall be tightened with at least three appropriate tapes and packaged in sequence with moisture-proof materials and linen tapes. Other packaging forms may also be used according to the agreement between the supplier and the buyer. A6.4 Each reel of painted steel strip shall be marked by appropriate methods, including: model, thickness, width, standard number, grade, batch number, manufacturer name and inspection department seal. A6.5 Each batch of painted steel strip shall be accompanied by a quality certificate, including: product name, model, thickness, width, standard number, grade, batch number, net weight, manufacturer name and manufacturing year and month. Appendix B
Main technical requirements for steel-plastic composite strip
(Supplement)
Steel-plastic composite strip is divided into plastic-steel-plastic and plastic-steel. B1
B2 Steel strip for steel-plastic composite strip shall be tin-plated and shall comply with the provisions of GB4174. Steel strip can also be chrome-plated, and its requirements shall be specified separately. The thickness of tin-plated steel strip or chrome-plated steel strip for steel-plastic composite strip is 0.15mm and 0.20mm. B34
B4 The peel strength between the films of the steel-plastic composite tape after hot pressing (temperature 150±2℃, pressure 30N/cm2, time 15s) should not be less than 17.5N/cm.
B5 The peel strength between the film and the steel tape of the steel-plastic composite tape should not be less than 6.1N/cm. 113 Qualified index
Test results shall be evaluated according to Table A2.
5% hydrochloric acid solution
5% sodium hydrocyanide solution
5% sodium chloride solution
Qualified index
The paint film is intact, but the paint film is allowed to peel off no more than 30% of the total area of the sample, and small bubbles on the surface are not counted. The paint film is intact, and only the paint film on the shear edge is allowed to peel off slightly by no more than 5mm. The paint film is intact, and only the paint film on the shear edge is allowed to peel off slightly by no more than 5mm. A5.6 The heat resistance test of the paint film of the painted steel strip is to separate the samples and place them flat in an oven at a specified temperature. After the specified time, take out the samples and cool them to room temperature. Then, the samples are bent once according to the test method of Article A5.3. The paint film is considered qualified if it does not peel or crack. However, the paint film peeling or cracking within 3mm from the edge can be ignored. A5.7 The low temperature test of the paint film of the painted steel strip is to separate the samples and place them flat in a refrigerator at a specified temperature. After the specified time test, take out the samples and restore them to room temperature. Then, the samples are subjected to a bending test once according to the test method of Article A5.3. The paint film is considered qualified if it does not peel or crack visually, but the paint film peeling or cracking within 3mm from the edge can be ignored. A6 Packaging and marking
A6.1 Painted steel strips should be delivered in rolls. The inner diameter of each roll of painted steel strip should be 200±5mm, and the outer diameter should be 630+10mm, which can also be determined according to the agreement between the supplier and the buyer.
GB 2952.1-89
A6.2 Each roll of painted steel strip should consist of one strip, and no more than 3 joints that are painted after electric welding are allowed. The joints should be free of defects such as sharp corners, slag, perforation, dislocation, etc. The tensile strength of the welded joint should not be less than 300N/mm (measured by the original strip base cross section). A6.3 Each roll of painted steel strip shall be tied with at least three appropriate tapes and packed with moisture-proof materials and linen tapes in sequence. Other packaging forms may also be used according to the agreement between the supplier and the buyer. A6.4 Each roll of painted steel strip shall be marked with appropriate methods, including: model, thickness, width, standard number, grade, batch number, manufacturer name and inspection department seal. A6.5 Each batch of painted steel strip shall be accompanied by a quality certificate, including: product name, model, thickness, width, standard number, grade, batch number, net weight, manufacturer name and manufacturing year and month. Appendix B
Main technical requirements for steel-plastic composite strip
(supplement)
Steel-plastic composite strip is divided into two types: plastic-steel-plastic and plastic-steel. B1
B2 Steel strip for steel-plastic composite strip shall be tin-plated and shall comply with the provisions of GB4174. Steel strip can also be chrome-plated, and its requirements shall be specified separately. The thickness of tin-plated steel or chrome-plated steel for steel-plastic composite tape is 0.15mm and 0.20mm. B34
B4 The peel strength between the films of steel-plastic composite tape after hot pressing (temperature 150±2℃, pressure 30N/cm2, time 15s) should not be less than 17.5N/cm.
B5 The peel strength between the film and steel tape of steel-plastic composite tape should not be less than 6.1N/cm. 113 Qualified index
Test results shall be evaluated according to Table A2.
5% hydrochloric acid solution
5% sodium hydrocyanide solution
5% sodium chloride solution
Qualified index
The paint film is intact, but the paint film is allowed to peel off no more than 30% of the total area of the sample, and small bubbles on the surface are not counted. The paint film is intact, and only the paint film on the shear edge is allowed to peel off slightly by no more than 5mm. The paint film is intact, and only the paint film on the shear edge is allowed to peel off slightly by no more than 5mm. A5.6 The heat resistance test of the paint film of the painted steel strip is to separate the samples and place them flat in an oven at a specified temperature. After the specified time, take out the samples and cool them to room temperature. Then, the samples are bent once according to the test method of Article A5.3. The paint film is considered qualified if it does not peel or crack. However, the paint film peeling or cracking within 3mm from the edge can be ignored. A5.7 The low temperature test of the paint film of the painted steel strip is to separate the samples and place them flat in a refrigerator at a specified temperature. After the specified time test, take out the samples and restore them to room temperature. Then, the samples are subjected to a bending test once according to the test method of Article A5.3. The paint film is considered qualified if it does not peel or crack visually, but the paint film peeling or cracking within 3mm from the edge can be ignored. A6 Packaging and marking
A6.1 Painted steel strips should be delivered in rolls. The inner diameter of each roll of painted steel strip should be 200±5mm, and the outer diameter should be 630+10mm, which can also be determined according to the agreement between the supplier and the buyer.
GB 2952.1-89
A6.2 Each roll of painted steel strip should consist of one strip, and no more than 3 joints that are painted after electric welding are allowed. The joints should be free of defects such as sharp corners, slag, perforation, dislocation, etc. The tensile strength of the welded joint should not be less than 300N/mm (measured by the original strip base cross section). A6.3 Each roll of painted steel strip shall be tied with at least three appropriate tapes and packed with moisture-proof materials and linen tapes in sequence. Other packaging forms may also be used according to the agreement between the supplier and the buyer. A6.4 Each roll of painted steel strip shall be marked with appropriate methods, including: model, thickness, width, standard number, grade, batch number, manufacturer name and inspection department seal. A6.5 Each batch of painted steel strip shall be accompanied by a quality certificate, including: product name, model, thickness, width, standard number, grade, batch number, net weight, manufacturer name and manufacturing year and month. Appendix B
Main technical requirements for steel-plastic composite strip
(supplement)
Steel-plastic composite strip is divided into two types: plastic-steel-plastic and plastic-steel. B1
B2 Steel strip for steel-plastic composite strip shall be tin-plated and shall comply with the provisions of GB4174. Steel strip can also be chrome-plated, and its requirements shall be specified separately. The thickness of tin-plated steel or chrome-plated steel for steel-plastic composite tape is 0.15mm and 0.20mm. B34
B4 The peel strength between the films of steel-plastic composite tape after hot pressing (temperature 150±2℃, pressure 30N/cm2, time 15s) should not be less than 17.5N/cm.
B5 The peel strength between the film and steel tape of steel-plastic composite tape should not be less than 6.1N/cm. 11
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