This standard specifies the dimensions, shape, weight, technical requirements, test methods, inspection rules, coating, marking and quality certificate of spiral seam submerged arc welded steel pipes (hereinafter referred to as "steel pipes") for low-pressure fluid transportation pipelines. This standard applies to steel pipes for ordinary low-pressure fluid transportation pipelines such as water, sewage, air, heating steam and flammable fluids, and also applies to steel pipes for other fluid transportation pipelines with similar requirements. SY/T 5037-2000 Spiral seam submerged arc welded steel pipes for low-pressure fluid transportation pipelinesSY/T5037-2000 Standard download decompression password: www.bzxz.net

ICS 75.180; 23.040.10; 77.140,75E98
Registration No.: 8180--2001
Petroleum and Natural Gas Industry Standard of the People's Republic of China SY/T 5037-2000
Spiral submerged arc-welded steel pipefor pipelines for low pressure fluid service2000-12-25Released
State Administration of Petroleum and Chemical Industry
2001-06-01Implementation
SY/T 5037—2000
Cited standards
4 Dimensions, shape and weight
Technical requirements
Test methods
Inspection rules
Coating, marking and quality certificate
SY/T 5037—2000
This standard is a revision of SY/T5037-92 "Spiral submerged arc welded steel pipes for ordinary fluid conveying pipelines": In this revision, the steel pipe size series has been adjusted, and the contents of non-destructive inspection of welds, coatings and markings have been revised. This standard is based on (GB/T 1.1-1993 "Guidelines for Standardization Work Unit 1: Rules for Drafting and Presentation of Standards Part 1: Basic Provisions for the Preparation of Standards". This standard shall replace SY/T5037-92 from the date of implementation. This standard was proposed by China National Petroleum Corporation. This standard is under the jurisdiction of the Petroleum Pipeline Professional Standard Promotion Committee. The drafting unit of this standard: Songji Shishan Steel Pipe Factory. The main drafters of this standard are Wu Fangzhong, Su Qi, Sun Timin, and Wang Hui. This standard was first issued in 1983, revised for the first time in 1992, and this is the second revision. 1 Scope
Petroleum and Natural Gas Industry Standard of the People's Republic of China for low pressure fluid transportation pipelines
Spiral subrnerged arc - welded steel pipefar pipelines for low pressure fluid serviceSY/T 5037—2000
Replaces SY/5037—92
This standard specifies the dimensions, shape, weight, technical requirements, test methods, inspection rules, coating, marking and quality certificate of spirally welded steel pipes (hereinafter referred to as "steel pipes") for low-pressure fluid transmission pipelines. This standard applies to steel pipes for ordinary low-pressure fluid transmission pipelines such as water, sewage, air, heating steam and flammable fluids, and also to steel pipes for other fluid transmission pipelines with similar requirements. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T222-1984 Sampling method for chemical analysis of steel and allowable deviation of chemical composition of finished products GB/T223.5-1997 Chemical analysis method for steel and alloys - Determination of acid-soluble silicon content by reduced molybdenum silicate photometric method CB/T223.58-1987 Chemical analysis method for steel and alloys - Determination of manganese content by sodium arsenate-sodium nitrate nitrate method GB/T223.59-1987 Chemical analysis method for steel and alloys - Determination of phosphorus content by phosphorus blue photometric method GB/T223. 681997 Chemical analysis methods for steel and alloys - Determination of sulfur content by potassium iodate titration after combustion in a tubular furnace G13/T223.69—1997 Chemical analysis methods for steel and alloys - Determination of carbon content by gas volumetric method after combustion in a tubular furnace GB/T241—1990 Hydraulic test methods for metal pipes G3/T7001988 Carbon structural steel
GB/I26511989 Tensile test method for welded joints - Radiography and quality classification of steel fusion welded butt joints GB/T 3323-1987
GB/T4336—1984 Photoelectric emission spectroscopic analysis method for carbon steel and medium and low alloy steels GB/T6397-—1986 Metal tensile test specimens GB/I 9711.1—1997 Technical conditions for delivery of steel pipes for natural gas transportation in Shishan industry Part 1: Grade A steel pipe SY/I6423.3-[999 Non-destructive testing methods for pressure steel pipes in petroleum and natural gas industry Ultrasonic testing of longitudinal and/or transverse imperfections in the weld of submerged arc welded steel pipes
3 Symbols
D)-Nominal outer diameter of steel pipe, nm;
T-Nominal wall of steel pipe, mm;
M-Weight of steel pipeline, kg/m;
Force-Test pressure of hydrostatic test, MPa; S-Test stress of static fire K test, MPa
h-Weld reinforcement, mm:
Approved by State Administration of Petroleum and Chemical Industry 2 Appendix-12-25 2040-06-01 Implementation
4 Dimensions, shape and weight
4.1 Outer diameter and wall thickness
SY/T5037—2000
4.1.1 The nominal outer diameter and nominal wall thickness of steel pipes shall comply with the provisions of Table 1. 4.1.2 The allowable deviation of the nominal outer diameter of steel pipes shall comply with the provisions of Table 2 and shall be measured by the circumference method. Note: After the allowable deviation of the nominal outer diameter of steel pipes is converted into circumference, it can be rounded to the nearest 1mm4.1.3 The allowable deviation of the nominal wall thickness of steel pipes shall comply with the provisions of Table 3. It can be measured by a wall thickness micrometer or other non-destructive testing devices with corresponding accuracy. In the event of a dispute over the nominal wall thickness measurement result or arbitration test, the result of the wall thickness micrometer measurement shall prevail. 4.2 Length of steel pipes
4.2.1 Normal length: 6~12m. The normal length of steel pipes can be lengthened or shortened by agreement between the purchaser and the manufacturer. 4.2.2 Cut length: Cut length should be within the usual length range, and its limit deviation is ±500mm4.2.3 Precision cut length: With the agreement between the purchaser and the manufacturer, precision cut length steel pipes with a length limit deviation stricter than that specified in 4.2.2 can be supplied.
4.3 Roundness
Within the 100mm length range of the pipe end, the maximum outer diameter of the steel pipe shall not be 1% larger than the nominal outer diameter, and the minimum outer diameter shall not be 1% smaller than the nominal outer diameter. Use a caliper, rod gauge or other measuring tool that can measure the maximum and minimum outer diameters. 4.4 Straightness
The curvature of the steel pipe shall not exceed 0.2% of the length of the steel pipe. A thin rope or thin metal wire can be pulled from one end of the side surface of the steel pipe to the other end, parallel to the axis of the steel pipe, and the maximum distance from the tightened thin rope or thin metal wire to the side surface of the steel pipe can be measured. 4.5 Pipe end
4.5.1 The pipe end of the steel pipe shall be processed with a groove. The groove angle is 30, and the blunt edge size is 1.6mm±0.8mm. The groove angle is measured based on the vertical line of the steel pipe axis. No burrs are allowed on the edge of the pipe end. According to the purchaser's requirements, it can be delivered in a flat head state. Other groove angles can also be used with the agreement of the supply and demand parties. 4.5.2 The end face of the steel pipe shall be perpendicular to the axis of the steel pipe. The limit deviation (cut bevel) is specified as follows: for steel pipes with a nominal outer diameter less than 813 mm, the limit deviation is 1.6 mm; for steel pipes with a nominal outer diameter greater than or equal to 813 mm, the limit deviation is 3.0 mmc4.6 Weight of steel pipe
4.6.1 The mass of the steel pipe line shall be calculated according to Table 1 or formula (1); M=0.0246615(DT)T
Wherein: M-
mass of the steel pipe line, kg/m;
-nominal outer diameter of the steel pipe, mm;
-nominal wall thickness of the steel pipe, mmo
4.6.2 The steel pipes within the scope of this standard shall be delivered by theoretical weight. With the agreement between the purchaser and the manufacturer, they may also be delivered by actual weight. 5 Technical requirements
5.1 Manufacturing method
5.1.1 The steel pipes within the scope of this standard are made of hot-rolled steel strips and spirally formed at room temperature. The spiral seams are welded by automatic submerged arc welding, and there shall be at least one internal and external submerged arc weld.
5.1.2 Butt welds of steel strips:
5.1.2.1 Butt welds of steel strips are allowed on the steel pipes, and the distance between the butt welds of steel strips and the pipe ends shall not be less than 300mm. After consultation between the purchaser and the manufacturer, the butt welds of steel strips are allowed to be located at the pipe ends, but there shall be at least 150mm circumferential spacing between the butt welds of steel strips and the corresponding spiral welds at the pipe ends. Butt welds of steel strips shall be welded by submerged arc welding, and there shall be at least one internal and external submerged arc weld. 5.1.2.2 The excess height of the butt welds of steel strips is allowed to be milled off, but the milled area or the original surface of the weld shall not be lower than the surface of the parent material. SY/T5037--2000
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Nominal outer diameter D
Note: The end is 100mm away from the steel front end SY/T 5037-2000
Table 2 Allowable deviation of nominal outer diameter of steel pipe
Allowable deviation
Table 3 Allowable deviation of nominal wall thickness of steel pipe
Standard outer diameter 1
5.1.3 For welded long steel pipe:
±0.75% or 12.5, whichever is smaller
±0.50%D or ±4.5, whichever is smaller
Allowable deviation
±12.5% T
5.1.3.1 It is allowed to weld two sections of the same specification and the same steel grade into a steel pipe. The length of each short pipe shall not be less than 2m
5.1.3.2 The spiral welds on both sides of the circumferential weld shall be staggered, and the distance between them shall not be less than 150mm. 5.1.3.3 The circumferential weld can be welded by arc welding or manual welding. 5.2 Types of steel
The steel pipes within the scope of this standard shall be welded with Q195, Q215 and Q235 steels of GB/T700-1988. With the agreement between the purchaser and the manufacturer, other steel grades with good welding performance may also be used, and their technical conditions shall be determined by agreement between the two parties! 5.3 Chemical composition
The smelting analysis composition of the selected steel shall comply with the provisions of the technical conditions of the corresponding standards or agreements, and the allowable deviation of the product analysis composition shall comply with the provisions of Table 1 in (GB/T222-1984). 5.4 Mechanical Performance
The spiral welded joints of steel pipes within the scope of this standard shall be subjected to tensile tests to determine the tensile strength of the welded joints. The tensile strength value shall not be lower than the minimum tensile strength value of the corresponding steel strip standard specification: 5.5 Hydrostatic pressure test
5.5.1 Each steel pipe shall be subjected to a hydrostatic pressure test at the manufacturer without leakage, and the test repulsion shall not be lower than the provisions of 5.5.2. 5.5.2 The test pressure of the hydrostatic pressure test of the steel pipe shall be calculated according to formula (2) and shall be accurate to 0.1MPa. 2ST
or: h——test pressure of hydrostatic pressure test, MPa; S——test stress of hydrostatic pressure test, MPa; T——nominal wall thickness of steel pipe, mn;
D——nominal outer diameter of steel pipe, nm:
Note: The test pressure of the hydrostatic test refers to the test pressure for steel pipe production process inspection, which does not provide a basis for pipeline design, and does not necessarily have a direct relationship with the working pressure.
5.5.3 The bottom force of the hydrostatic test shall be selected according to 60% of the minimum yield strength specified in the corresponding steel strip standard. 5.5.4 For steel pipes with a nominal outer diameter less than 508mm, the test pressure holding time of the hydrostatic test shall be no less than 5s; for steel pipes with a nominal outer diameter not less than 508mm, the test pressure holding time of the hydrostatic test shall be no less than 105gSY/T5037-2000
5.5.5 Steel pipes found to be leaking or seeping during the hydrostatic test may be repaired according to the provisions of 5.9. 5.6 Nondestructive testing
5.6.1 The repair welds of steel pipes, butt welds of steel strips and circumferential welds shall be subjected to X-ray or ultrasonic testing. The spiral welds of steel pipes used for conveying flammable common fluids shall be subjected to 100% X-ray or ultrasonic inspection, and the spiral welds of steel pipes used for conveying common fluids such as water, sewage, air, heating steam, etc. shall be subjected to X-ray or ultrasonic inspection spot checks. 5.6.2 The weld acceptance standards are as follows: Www.bzxZ.net
a) When X-ray inspection is adopted, the welds shall not be lower than the grade III weld standard in GB/T3323-1987, but the circular defects of welds used for conveying flammable common fluids shall not be lower than the grade II weld standard in GB/T3323-1987. For welds that do not meet the above requirements, repair welding can be carried out in accordance with the provisions of 5.9.
b) When ultrasonic inspection is adopted, the welds shall not be lower than the acceptance level L3 stipulated in SY/T6423.3-1999. For welds lower than the acceptance level L3, repair welding can be carried out in accordance with the provisions of 5.9. 5.7 Appearance quality
5.7.1 Surface quality of steel pipe
The surface of the steel pipe shall not have cracks, scars, folds or other defects whose depth exceeds the lower deviation of the nominal wall thickness. For defects whose depth cannot be determined, grinding should be used to completely remove them and then measure them. 5.7.2 Delamination and inclusions
The steel pipe is not allowed to have delamination or inclusions that extend to the end face or groove face and whose transverse dimension exceeds 6.4mm. The pipe end with delamination or inclusion exceeding 6.4mm should be cut back to make sure that there is no delamination or inclusion exceeding 6.4mm. 5.7.3 Pit
There shall be no pit with a depth exceeding 6.4mm on the wall of the steel pipe. The pit depth refers to the distance between the lowest point of the depression and the extension of the original contour of the steel pipe. The length of the pit shall not exceed 0.5D in any direction. When the depressed part has sharp scratches, the depression depth shall not exceed 3.2mm. For pits with sharp scratches, the sharp scratches should be ground off, but the depth and length of the pits after grinding should comply with the above provisions. 5.7.4 Weld Reinforcement
5.7.4.1 The weld reinforcement of steel pipes shall comply with the provisions of Table 4. Table 4 Weld Reinforcement
Nominal wall thickness of steel pipe T
According to needs, the weld within the length range of 100mm from the pipe end can be ground flat. 5.7.4.3 Grinding is allowed when the weld height exceeds the provisions of this article. 5.7.5 Misalignment
Weld Reinforcement h
5.7.5.1 For steel pipes with a nominal wall thickness less than or equal to 12.5mm, the misalignment (radial misalignment of two opposite sides of the steel strip) shall not exceed 0.35T and the maximum shall not exceed 3.0mm. For steel pipes with a nominal wall thickness greater than 12.5mm, the misalignment shall not exceed 0.25T. 5.7.5.2 For steel pipes with misaligned edges, it is allowed to cut the weld, heat and level it, and then repair it. After the repair welding, the leveling area and the 300mm length before and after it (along the weld direction) must be subjected to non-destructive inspection. 5.7.6 Weld defects
5.7.6.1 The weld shall not have defects such as cracks, broken arcs, burn-throughs and arc pits. The weld shape should be uniform and regular, with a smooth transition. 5.7.6.2 Weld bite edges of any length and a maximum depth of no more than 0.6rmm are allowed to exist. On any 0.3m length weld, the maximum depth shall not exceed 0.8mm, and shall not exceed 12.5% ​​of the nominal wall thickness of the steel pipe, and the weld bite edges with a maximum length of half the nominal wall thickness of the steel pipe shall not exceed two.
SY/T5037—2000
Weld undercuts exceeding the above requirements shall be handled in the following ways: a) Undercuts with a depth not exceeding 0.8mm and not exceeding 12.5% ​​of the nominal wall thickness of the steel pipe shall be ground; b) Undercuts with a depth exceeding 0.8mm or exceeding 12.5% ​​of the nominal wall thickness of the steel pipe shall be handled in accordance with the methods b), c) or d) in 5.7.7. 5.7.7 Treatment of defects
For steel pipes with the above defects, one of the following methods shall be used: a) The defects can be ground off with a grinding wheel, but the remaining wall thickness must be within the allowable deviation range; b) Repair according to the provisions of 5.9;
c) Cut off the defective pipe section within the allowable length range; d) Judge as unqualified.
5.8 Grinding and repairing of defects
5.8.1 The ground area shall smoothly transition to the original surface of the steel pipe. 5.8.2 Repair welding can be carried out by submerged arc welding or manual welding. 5.8.3 Defects on the parent material and welds of the steel pipe can be repaired. Repair should be carried out in accordance with the provisions of 5.9. The repair welds should be inspected by the non-destructive testing method specified in 5.6.
5.9 Requirements for repair of defects
5.9.1 Defects should be removed before repair. The repair weld should be thoroughly cleaned to meet the welding requirements. 5.9.2 The minimum length of the repair weld is 50mm. If the direction of the defects on the parent material of the steel pipe allows, the repair weld should be in the circumferential direction. 5.9.3 The repair weld should be ground to make a smooth transition with the original surface of the steel pipe. The height of the parent material after repair welding shall not exceed 1.5mm. 5.9.4 The repaired steel pipe shall be subjected to a hydrostatic pressure test in accordance with the provisions of 5.5.1. 6 Test method
6.1 Chemical composition
6.1.1 The samples for chemical analysis can be taken from finished steel pipes or steel strips. When sampling from steel strips, the sampling method shall comply with the sampling provisions of the steel strip standard; when sampling from steel pipes, the distance between the sampling position and the weld shall not be less than one-fourth of the distance between adjacent spiral welds. 6.1.2 The chemical composition analysis method shall be carried out in accordance with the provisions of GB/T4336 or GB/T223.5, GB/T223.58, GB/T223.59, GB/T223.68, GB/T223.69. In case of dispute, the analysis results of GB/T223.5, GB/T223.58, GB/T223.59, GB/T223.68, GB/T223.69 shall prevail. 6.2 Tensile test
6.2.1 The sample for tensile test of welded joints shall be cut perpendicular to the weld, with the weld in the middle of the sample. Its shape and size shall comply with the provisions of 4.3.2 of GB/T6397-1986. Whether the weld excess height is removed shall be determined by the manufacturer. It is allowed to flatten the specimen at room temperature. 6.2.2 Except as otherwise specified in this standard, the tensile test method shall be carried out in accordance with the provisions of GB/T2651, and the test temperature shall be room temperature. 6.3 Hydrostatic pressure test
The hydrostatic pressure test method shall be carried out in accordance with the provisions of GB/T241 6.4 Nondestructive testing
6.4.1 The X-ray inspection method shall comply with the provisions of 8.10.11.2 of GB/T9711.1-1997. 6.4.2 The ultrasonic inspection method shall comply with the provisions of SY/T6423.3 7 Inspection rules
7.1 Surface and dimension inspection
The surface quality of steel pipes shall be inspected one by one. At least one steel pipe shall be randomly selected at the beginning of each work shift and every 4 hours for dimension and shape measurement. If the size or shape of any steel pipe exceeds the allowable deviation, all steel pipes before and after the steel pipe shall be measured one by one until the size or shape of two consecutive steel pipes are within the allowable deviation range. 7.2 Chemical composition of parent material
SY/T 5037--2000
7.2.1 The manufacturer shall take samples of steel pipe parent material or steel strip for chemical analysis, and one sample shall be taken from each smelting batch of steel pipes or steel strips for testing.
7.2.2 If the test results of the steel pipes or steel strips representing a smelting batch are unqualified, the manufacturer shall take two samples from the uninspected steel pipes or steel strips of the smelting batch for re-inspection; if the test results of the re-inspected samples are all qualified, then the batch of steel pipes can be judged as qualified except for the steel pipes or steel strips that failed the initial inspection; if the test results of one or two samples in the re-inspected samples are unqualified, the steel pipes or steel strips that have not been inspected in the smelting batch shall be sampled one by one (roll) for testing. 7.3 Tensile test of welded joints
7.3.1 The tensile test of welded joints shall be conducted on one steel pipe from a batch of no more than 80 steel pipes of the same steel grade and size produced by the same work shift, and a sample shall be taken for testing.
7.3.2 If the tensile test results of a batch of steel pipes are unqualified, the manufacturer may select two more steel pipes from the same batch of steel pipes and take one sample from each steel pipe for re-inspection; if the test results of the re-inspected samples are all qualified, then the batch of pipes can be judged as qualified except for the steel pipes that failed the initial sampling. If the test results of one or two samples in the re-inspected samples are unqualified, the manufacturer shall take samples from the uninspected steel pipes in the batch for testing.
7.4 Non-destructive testing
Except for 100% X-ray or ultrasonic testing of spiral welds of steel pipes used for conveying flammable common fluids, the spiral welds of the first steel pipe for X-ray or ultrasonic spot inspection of spiral welds shall be inspected at the beginning of each shift and when the production process parameters of the steel pipe are adjusted. During normal production, at least two steel pipes are sampled for spiral weld inspection for every 10 steel pipes. 8 Coating, marking and quality certificate
8.1 Coating
Steel pipes shall be delivered as plain pipes (without coating). If the purchaser requires the outer surface of the steel pipe to be delivered with a temporary coating to reduce rust during transportation, the purchaser shall indicate this in the order form. The temporary coating shall be smooth and uniform, and shall not be too thick or leaking. 8.2 Marking
8.2.1 Marking position
For steel pipes with a nominal outer diameter less than 40%.4mm, the marking position shall start from 450mm to 750mm from the outer surface to the pipe end. For steel pipes with a nominal outer diameter not less than 406.4mm, the marking position shall start from not less than 150mm from the inner surface to the pipe end. The marking shall be done by stencil painting according to the contents and sequence described in 8.2.2. Marking,
8.2.2 Content and order of marking
a) Manufacturer's name or logo:
This standard number:
e) Nominal outer diameter of steel pipe: mm;
d) Nominal wall thickness of steel pipe, r;
e) Length of steel pipe, imm
f Steel grade:
g) Zeng number (the last two digits of the year of production, followed by "car" and serial number) and manufacturing! Other contents that are deemed necessary to be marked: Marking example: Spiral submerged arc welded steel pipe for low-pressure fluid delivery pipeline, manufacturer mark AB, nominal outer diameter 610mm, nominal wall thickness 8mm, length 11.5m, steel grade 235H, pipe number 00#2140AH SY/T5037610&11500
Q235B00=2140
8.3 Quality certificate
The steel pipes shipped out of the factory shall be provided by the manufacturing or quality inspection department with a certificate of quality to prove that the steel provided meets the requirements of this standard. The quality certificate shall state: a) manufacturer name; b) purchaser name; c) contract number; d) standard number; e) product name and size; g) number and weight of strips; SY/T 5037-2000; h) various test results specified in the standard and contract; i) shipping number; i) shipping date; k) stamp of the quality inspection department. And other contents that the manufacturer deems necessary to indicate.2 If the tensile test results of a batch of steel pipes are unqualified, the manufacturer may select two more steel pipes from the same batch of steel pipes and take one sample from each steel pipe for re-inspection; if the test results of the re-inspected samples are all qualified, then the batch of pipes can be judged as qualified except for the steel pipes that failed the initial sampling: If the test results of one or two samples in the re-inspected samples are unqualified, the manufacturer shall take samples of the uninspected steel pipes in the batch for testing.
7.4 Non-destructive testing
Except for 100% X-ray or ultrasonic testing of spiral welds of steel pipes used for conveying flammable ordinary fluids, the spiral welds of the first steel pipe for X-ray or ultrasonic spot inspection of spiral welds shall be inspected at the beginning of each shift and when the production process parameters of the steel pipe are adjusted. During normal production, at least two steel pipes shall be sampled for spiral weld inspection for every 10 steel pipes. 8 Coating, marking and quality certificate
8.1 Coating
Steel pipes shall be delivered as plain pipes (without coating). If the purchaser requires the outer surface of the steel pipe to be delivered with a temporary coating to reduce rust during transportation, the purchaser shall indicate this in the order form. The temporary coating shall be smooth and uniform, and shall not be too thick or leaking. 8.2 Marking
8.2.1 Marking position
For steel pipes with a nominal outer diameter less than 40%.4mm, the marking position shall start from 450mm to 750mm from the outer surface to the pipe end. For steel pipes with a nominal outer diameter not less than 406.4mm, the marking position shall start from not less than 150mm from the inner surface to the pipe end. The marking shall be done by stencil painting according to the contents and sequence described in 8.2.2. Marking,
8.2.2 Content and order of marking
a) Manufacturer's name or logo:
This standard number:
e) Nominal outer diameter of steel pipe: mm;
d) Nominal wall thickness of steel pipe, r;
e) Length of steel pipe, imm
f Steel grade:
g) Zeng number (the last two digits of the year of production, followed by "car" and serial number) and manufacturing! Other contents that are deemed necessary to be marked: Marking example: Spiral submerged arc welded steel pipe for low-pressure fluid delivery pipeline, manufacturer mark AB, nominal outer diameter 610mm, nominal wall thickness 8mm, length 11.5m, steel grade 235H, pipe number 00#2140AH SY/T5037610&11500
Q235B00=2140
8.3 Quality certificate
The steel pipes shipped out of the factory shall be provided by the manufacturing or quality inspection department with a certificate of quality to prove that the steel provided meets the requirements of this standard. The quality certificate shall state: a) manufacturer name; b) purchaser name; c) contract number; d) standard number; e) product name and size; g) number and weight of strips; SY/T 5037-2000; h) various test results specified in the standard and contract; i) shipping number; i) shipping date; k) stamp of the quality inspection department. And other contents that the manufacturer deems necessary to indicate.2 If the tensile test results of a batch of steel pipes are unqualified, the manufacturer may select two more steel pipes from the same batch of steel pipes and take one sample from each steel pipe for re-inspection; if the test results of the re-inspected samples are all qualified, then the batch of pipes can be judged as qualified except for the steel pipes that failed the initial sampling: If the test results of one or two samples in the re-inspected samples are unqualified, the manufacturer shall take samples of the uninspected steel pipes in the batch for testing.
7.4 Non-destructive testing
Except for 100% X-ray or ultrasonic testing of spiral welds of steel pipes used for conveying flammable ordinary fluids, the spiral welds of the first steel pipe for X-ray or ultrasonic spot inspection of spiral welds shall be inspected at the beginning of each shift and when the production process parameters of the steel pipe are adjusted. During normal production, at least two steel pipes shall be sampled for spiral weld inspection for every 10 steel pipes. 8 Coating, marking and quality certificate
8.1 Coating
Steel pipes shall be delivered as plain pipes (without coating). If the purchaser requires the outer surface of the steel pipe to be delivered with a temporary coating to reduce rust during transportation, the purchaser shall indicate this in the order form. The temporary coating shall be smooth and uniform, and shall not be too thick or leaking. 8.2 Marking
8.2.1 Marking position
For steel pipes with a nominal outer diameter less than 40%.4mm, the marking position shall start from 450mm to 750mm from the outer surface to the pipe end. For steel pipes with a nominal outer diameter not less than 406.4mm, the marking position shall start from not less than 150mm from the inner surface to the pipe end. The marking shall be done by stencil painting according to the contents and sequence described in 8.2.2. Marking,
8.2.2 Content and order of marking
a) Manufacturer's name or logo:
This standard number:
e) Nominal outer diameter of steel pipe: mm;
d) Nominal wall thickness of steel pipe, r;
e) Length of steel pipe, imm
f Steel grade:
g) Zeng number (the last two digits of the year of production, followed by "car" and serial number) and manufacturing! Other contents that are deemed necessary to be marked: Marking example: Spiral submerged arc welded steel pipe for low-pressure fluid delivery pipeline, manufacturer mark AB, nominal outer diameter 610mm, nominal wall thickness 8mm, length 11.5m, steel grade 235H, pipe number 00#2140AH SY/T5037610&11500
Q235B00=2140
8.3 Quality certificate
The steel pipes shipped out of the factory shall be provided by the manufacturing or quality inspection department with a certificate of quality to prove that the steel provided meets the requirements of this standard. The quality certificate shall state: a) manufacturer name; b) purchaser name; c) contract number; d) standard number; e) product name and size; g) number and weight of strips; SY/T 5037-2000; h) various test results specified in the standard and contract; i) shipping number; i) shipping date; k) stamp of the quality inspection department. And other contents that the manufacturer deems necessary to indicate.
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