Some standard content:
ICS 77. 140. 75
National Standard of the People's Republic of China
GB/T14975—2002
Replaces GB/T14975—1994
Stainless steel seamless tubes for structures2002-09-11Promulgated
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Implementation on 2003-02-01
GB/T 14975 2002
This standard adopts ASTMA2692000-General purpose austenitic stainless steel seamless and welded steel tubes" and ASTMA5111996 "Stainless steel seamless tubes for mechanical engineering". Compared with the first two foreign standards, the allowable deviations of the outer diameter and wall thickness of this standard are equivalent to them. Ten major differences are as follows:
The phosphorus content in steel in this standard is stricter than that in foreign standards; Opa.2 in mechanical properties is stricter than that in foreign standards; hydraulic test is stricter than that in foreign standards.
Compared with GB/14975--1991, the main changes in this standard are as follows: Added classification, code and ordering content; Modified the outer diameter and wall thickness series; Expanded the specification range; · Modified the wall thickness size deviation, expanded the steel pipe range length: Modified the fixed length and multiple length deviation;
Added requirements for the full length bending, out-of-roundness and wall unevenness of steel pipes; —…· Modified the theoretical weight delivery deviation regulations. New content is added on the basis of the original brand:
The maximum test pressure of the hydraulic test is specified. This standard will be implemented from February 1, 2003. This standard shall replace GB/T1497-1994 "Structural Seamless Stainless Steel Pipe" from the date of implementation. This standard was proposed by the former State Metallurgical Industry Bureau and is under the jurisdiction of the National Steel Standardization Technical Committee. The drafting units of this standard are Sichuan Chuantou Great Wall Special Steel (Group) Co., Ltd. and Panzhihua Iron and Steel Group Chengdu Seamless Steel Pipe Co., Ltd. The main drafters of this standard are Xu Lianwen, Gao Zhiyuan, Yan Ru, Li Hong, Shi Jun, Su Cheng. This standard was first issued in 1994 and revised for the first time in 2001. 1 Scope
Structural Seamless Stainless Steel Pipe
GB/T 14975--2002
This standard specifies the classification, code, size, shape, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of structural seamless stainless steel pipes
This standard applies to stainless steel seamless pipes for general structures and machine-base structures (hereinafter referred to as steel pipes). 2 Normative references
The clauses in the following documents become the clauses of this standard through the use of the standard. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest versions shall apply to this standard. GB/T 222 Sampling methods for chemical analysis of steel and allowable deviations of chemical composition of finished products GI3/T 223.11 Chemical analysis of steel and alloys: Determination of chromium content by ammonium persulfate oxidation method GI3/T 223.16
5 Chemical analysis methods for steel and alloys: Determination of titanium content by chromotropic acid photometry GI3/T 223. 25
Chemical analysis methods for steel and alloys: Determination of nickel content by dimethylglyoxime gravimetric method G3/T 223. 28
GB/T 223. 36
G13/T223.4
Methods for chemical analysis of steel and alloysDetermination of clamp content by α-benzoin calendar gravimetric methodDetermination of nitrogen content by distillation separation-neutralization titration methodDetermination of sawdust content by chlorine magnetophenol S photometric methodGI3/T223.60Methods for chemical analysis of steel and alloysDetermination of silicon content by perchloric acid dehydration gravimetric methodG13/T 223. 62
Methods for chemical analysis of steel and alloys
Determination of phosphorus content by butyl acetate photometric method
G1/T 223.63
GB/T 223.68
GI3/T223.69
Methods for chemical analysis of iron, steel and alloys
The sodium (potassium) disulfide photometric method for determination of manganese contentMethods for chemical analysis of iron, steel and alloys
Methods for chemical analysis of iron, steel and alloys
GB/T228—1987Methods for tensile testing of metalsGB/T 241
GB/T 242
GB/T246
GB/T 2102
GB/F 2975
Methods for testing liquid metal tubes
Methods for testing expansion of metal tubes
Methods for testing flattening of metal tubes
Determination of sulfur content by potassium iodate titration after combustion in a tubular furnaceDetermination of carbon content by gas volumetric method after combustion in a furnaceAcceptance, packaging, marking and quality certificate of steelMechanical properties test sampling location and test sample preparation of steel and steel products10% oxalic acid corrosion test method for stainless steel
GB/T 4334.1
GB/T 4334. 2
Test method for corrosion of stainless steel by sulfuric acid and ferric sulfate GB/T4334.3Test method for corrosion of stainless steel by 63% nitric acid GB/T 4334. 4
Test method for corrosion of stainless steel by nitric and hydrofluoric acid GB/T4334.5Test method for corrosion of stainless steel by sulfuric acid and copper sulfate GB/T4334.6Test method for corrosion of stainless steel by 5% sulfuric acid GB/T5777Ultrasonic flaw detection method for seamless steel pipes GB/T6397—1986Metal tensile test specimens GB/T7735—1995
Eddy current flaw detection method for steel pipes
GB/T 14975—2002
GB/T 11170 Photoelectric emission spectrum analysis method of stainless steel CB/T17395—1998 Dimensions, shape, weight and allowable deviation of seamless steel pipes 3 Classification and code
Steel pipes are divided into one category according to the product processing method, and the category and code are: Hot wheel (extrusion, expansion) steel pipe
Cold drawn (rolled) steel pipe
Steel pipes are divided into two categories according to dimensional accuracy:
General grade
Order content
The contract or order for ordering steel pipes according to this standard shall include the following contents as needed, so as to make appropriate descriptions of the required steel pipes: a) Standard number:
Product name;
Steel brand:
Dimensional specifications;
Weight or quantity;
Delivery status:
Optional requirements:
Other special requirements.
5 Dimensions, shape and weight
5.1 Outer diameter and wall thickness
5.1.1 The outer diameter and wall thickness of the steel pipe shall comply with the provisions of Table 3 of GB/T17395-1998. According to the requirements of the purchaser, after consultation between the supply and demand parties and indicated in the contract, steel pipes of other sizes other than those specified in Table 3 of GB/T17395-1998 may be supplied. The small deviation of the size shall comply with the provisions of the adjacent larger specification. 5.1.2 The allowable deviation of the outer diameter and wall thickness of the steel pipe It should comply with the specifications in Table 1. When the purchaser requires a high level of deviation, it should be noted in the contract. 5.1.3 According to the purchaser's requirements, after the agreement between the supply and demand parties, it should be noted in the contract that the steel pipes for mechanical processing can specify the mechanical allowance. 5.2 Length
5.2.1 Steel pipes are generally delivered in normal lengths, which should comply with the following provisions: Hot-rolled (extruded and protected) steel pipes...2mm~12000mm; Cold-drawn (rolled) steel pipes...·
*.*.-1 (0 mm--lo 500 mm.
5.2.2 The fixed length and multiple length should be within the normal length range. The full length tolerance is divided into three levels (see Table 2). Each multiple length should be left with the following cutout margins:
Outer diameter 159 mm..
Outer diameter ≥159 m*
...5 mm~-10 mm:
...10mm-15mm.
Nominal outer diameter
Nominal wall thickness
Hot-rolled (extruded, expanded> copper tube
Table 1 Outer diameter and wall thickness tolerance of steel tube
Allowable deviation
All common grades
68--159
>159～426
±1-25%
Above 1.5 Add
Allowable deviation grade of alloy length
Nominal outer diameter
Nominal wall thickness
Table 2 Allowable deviation of full length
Cold drawn (rolled) steel pipe
>30-~30
GR/T 14975 --2002
Unit: millimeter
Allowable deviation
Grade
Allowable deviation of full length/mm
Note: If the allowable deviation grade of full length is not specified in the contract, the allowable deviation of the full length of the pin shall be in accordance with I.1. High grade
5.2.3 For special purpose steel pipes, such as stainless acid-resistant steel ultra-thin-wall steel pipes with a ratio of nominal outer diameter to nominal wall thickness greater than or equal to 10, and steel pipes with a diameter ≤30 The length deviation of small diameter steel pipes of In can be agreed upon by the supply and demand parties. 5.2.4 The standard length should be within the normal length standard. 5.3 Curvature
5.3.1 Full length curvature
The full length curvature of the steel pipe should not be greater than 0.15 of the total length. 5.3.2 Curvature per meter
The curvature per meter of the steel pipe shall not be greater than the following provisions: Wall thickness 15 mm
Wall thickness 15 mm*
Heat protection pipe
5.4 End shape
.-1.5 /n:
.-2.0 mm/m:
.-3.0 mm/m.
The two end faces of the steel pipe should be perpendicular to the steel pipe axis and clear of burrs. 5.5 Non-roundness and uneven wall thickness
According to the requirements of the purchaser, after consultation between the supply and demand parties and indicated in the contract, the non-roundness and uneven wall thickness of the steel pipe shall not exceed 80% of the outer diameter and wall thickness respectively.
5. 6 Delivery weight
The steel pipe is delivered according to the actual weight.
According to the requirements of the purchaser and indicated in the contract, the steel pipe can be delivered according to the theoretical weight. The theoretical weight of the steel pipe is calculated according to formula (1): os)
theoretical weight of steel pipe, in dry grams per meter (kg/tn);-(12
GB/T14975-2002
t3. 141 6;
——density of steel, in kilograms per cubic decimeter (kg/dm), the density of steel is shown in Table 4; S-nominal wall thickness of steel pipe, in millimeters (mm); L)-nominal outer diameter of steel pipe, in millimeters (nim). When the steel pipe is delivered according to the theoretical weight, the two parties shall negotiate the allowable deviation of the weight and note it in the contract. 5-7 Marking example
The outer diameter of the cold-drawn (rolled) steel pipe made of 00Cr17Ni14Mo2 steel is 25 mm, the wall thickness is 2mm, the cut length is 6000 mm, and the dimensional accuracy is ordinary grade. Its mark is: WC 00Cr[7Ni14Mo2-25X2X6 000 GB/T 14975 2002 The outer diameter of the cold-drawn (rolled) steel pipe made of 00Cr17Ni14Mo2 steel is 25 mm, the wall thickness is 2mm, the cut length is 6000 mm, and the dimensional accuracy is high-grade. Its mark is:
WC 00Cr17Ni14Mo2-25(PC) ×2X 6 000—GB/T 14975—20026 Technical requirements
6.1 Steel grade and chemical composition
6.1.1 The steel grade and chemical composition (melting analysis) shall comply with the provisions of Table 3, and the steel pipe shall be inspected and accepted according to the melting composition. According to the requirements of the purchaser, steel pipes with grades other than those in Table 3 may be supplied after agreement between the supply and demand parties. 6.1.2 If the purchaser requires finished product analysis, it shall be indicated in the contract. The allowable deviation of the chemical composition of the finished steel pipe shall comply with the provisions of GB/T222.
6.2 Manufacturing method
6.2.1 Steel smelting method
Steel can be smelted in an electric furnace or in an electric arc furnace plus refining outside the furnace. Other refining methods may be used upon agreement between the supplier and the end party. 6.2.2 Manufacturing method of steel pipes
Steel pipes shall be manufactured by hot rolling (extrusion, expansion) or cold drawing (rolling). When the purchaser requires a certain manufacturing method, it shall be specified in the contract. 6.3 Delivery status
6.3.1 Steel pipes shall be delivered after heat treatment and pickling. The recommended heat treatment system for finished steel pipes is shown in Table 4. 6.3.2 Austenitic hot extruded pipes, if quenched within the temperature range specified in Table 4, can be regarded as steel pipes that have undergone finished product heat treatment. 6.3.3 Steel pipes that have been integrally ground, bored or heat treated in a protective atmosphere may be delivered without pickling. 6.3.4 Steel pipes for mechanical processing may be delivered without pickling. 6.3.5 According to the requirements of the purchaser and indicated in the contract, austenite and austenite-ferrite cold drawn (rolled) steel tubes can also be delivered in the processed state. The bending degree, mechanical properties, flattening test, etc. of the steel tubes shall be agreed upon by the supply and demand parties. 6.3.6 After the agreement between the supply and demand parties and indicated in the contract, the steel tubes may adopt other heat treatment systems other than those specified in Table 4. 6.4 Mechanical properties
The longitudinal mechanical properties (tensile strength, elongation after fracture, etc.) of the heat-treated steel tubes shall comply with the provisions of Table 4. According to the requirements of the purchaser and indicated in the contract, the specified non-proportional elongation stress αPi2 of the steel tubes may be measured. The measured value shall comply with the provisions of Table 4.
GB/T 14975—2002
zz0--C10
27*0--1
08 *0--(20 0
08 --(200
G2 '0~- %29
00~00-
00 *v-~00 \S
05 -~09*2
G9*--09*2
08 *0~-(2C 0-%3)9
Ge '--n8'1
C'0~%0S
CFz~-08 1
00 * ~00 2
00~00 2
00 81-~091
0981~00*91
00 -02~00 8
00 °61~00 21
00 *02~00*8
002~008
006 ~~90 21
00 *6t~30 9t
00 *61-~00:
(00 *61 --00 *91
00 '6[ ~-00 *91
00 *81-~00 *91
05 81~0091
-61-00:11
00*6[-~00°2]
00-081
00-61--00-21
00~61~-00-21
050 01980 -00
00 -F1-~00 :01
060 03 580 03
os'tt~-osGl
05-002
080 0580 0200 3
05*11 0s 8
00 3: 00:1
00'[~00°1
00 11-~00 8
00*+[--00 *11
00 *11-~00'11
00 *{{--00*11
00 *fl~-of'11
00*5~-00 °21
00 *1~00 °01
00 :1~-00 *G
001~006
00'2-~00 *8
[HO'OT-~On'8
00 :11~-00 *8
080.0960 03
00 001
0005900
090 C980 0
00-1 21 08
080-080 0
00 1c0 -0
08002980000
00 -2
00-200
A0netiN1330
NZOS LIN2[OG0
NOHN8OGO
EnNSTnGOCO: +
COWENGO08!
ILGIN8[IO
LE LEN&
OATIN8+0
ZOwiTinITIo
ANIN810
LOINDO
|tt||GB/T14975—2002
00*9~092
GO-6T-01-81
C*+--00l
00 *81~00*01
09 9~09
C30 000.0 0 2~08 c80 0
00 1 100
050 0580 0
ZISOWENSI00
GB/T14975—2002
Wuzhong:
H is the distance between the plates after flattening, in millimeters (mm); S is the distance between the steel pipes. Nominal wall thickness, in meters (mm); D---Nominal outer diameter of the steel pipe, in millimeters (mm); α---single length deformation coefficient. Austenitic steel pipe is 0.09, and other steel pipes are 0.07. 6.5.2 Expansion test
According to the requirements of the purchaser and specified in the contract, steel pipes with a wall thickness less than or equal to 10 mm can be subjected to expansion test. The top taper of the expansion test is 30°45\ Or 60°, the expansion value of the outer diameter after expansion is 10%, and no cracks or splits will appear on the test specimen after expansion. 6.5.3 Hydraulic test
According to the purchaser's requirements and specified in the contract, each steel pipe shall be subjected to hydraulic test. The test pressure shall be calculated according to formula (3). The maximum test pressure of the steel pipe shall not exceed 14MPa: ||tt ||P = 2SR/I
Wu Zhong:
-test pressure, in MPa
S--nominal wall thickness of boiler tube, in mm ( mm); D is the nominal outer diameter of the steel pipe, in millimeters (mm); R is the allowable stress, which is 40% of the tensile strength specified in this standard, in megapascals (MPa). Under the symptomatic test pressure, it should be ensured that the resistance to civil The time shall not be less than 5$, and the steel pipe shall not leak or seep. (3)
The supplier may use ultrasonic testing or eddy current testing instead of hydraulic testing. Ultrasonic testing is carried out in accordance with GB/T5777, and the groove depth of the comparison sample is 12.5% of the nominal wall thickness of the steel pipe; the eddy current test comparison sample pipe adopts Class A in GB/T7735-1995. 6.6 Intergranular corrosion test
According to The purchaser requires and specifies in the contract that austenitic and austenitic-ferritic steel pipes shall be subjected to inter-product corrosion tests. The inter-product corrosion test method shall comply with the provisions of CB/T1334.1~-4331.6. The test method shall be agreed upon by both parties and specified in the contract. If not specified, the test method shall be carried out in accordance with the test provisions of GB/T4334.5. 6.7 Surface quality
6.7.1 There shall be no cracks or folds on the inner and outer surfaces of the steel pipe. Rolling, delamination and scarring exist. These defects should be completely removed, and the removal depth shall not exceed the negative deviation of the nominal wall thickness. The actual wall thickness at the cleaned area shall not be less than the minimum allowed wall thickness. 6.7.2 On the inner and outer surfaces of the steel pipe, the allowable depth of the straight line is as follows: Hot rolling ( Extrusion, expansion) steel pipe: not more than 5 times the nominal wall thickness. For steel pipes with a diameter less than or equal to 140 mm, the maximum allowable depth is not more than 0.5 mm; for steel pipes with a diameter greater than 140 mm, the maximum allowable depth is not more than 0.8 mm. Drawing (rolling) steel pipe: not more than 4% of the nominal wall thickness (the allowable straight depth for wall thickness less than 1.4mm is 0.05mm), the maximum depth is not more than 0.30mm.
6.7.3 No more than the step Other defects such as negative thickness deviation are allowed to exist. 6.7.4 For steel pipes for machining, if the supplier and buyer agree in the contract, as long as the supplier can ensure that the depth of the above defects is within the machining allowance range, they do not need to be removed.
7 Test method||tt| |The test methods for various inspections of steel pipes shall comply with the provisions of Table 5. 8 Inspection rules
8.1 Inspection and acceptance
The inspection and acceptance of steel pipes shall be carried out by the technical supervision department of the supplier. 8.2 Batch rules| |tt||GB/T14975—2002
Steel pipes are inspected and accepted in batches. Each batch of steel pipes shall be of the same brand, same furnace number, same specification and same heat treatment system (furnace). The quantity of each batch of steel pipes shall not exceed the following regulations: outer diameter 76mm wall thickness 3nm-..
Outer diameter 35lmm.
Other sizes:
8.3 Sampling quantity
·500 pieces;
50 pieces;
?200 pieces ,bzxZ.net
The number of samples to be taken for each inspection of each batch of steel pipes The provisions of Table 5 shall apply. Table 5 Inspection items, sampling quantity and test methods for steel pipes No.
Inspection item
Chemical composition
Tensile test
Pressure fan Test
Expansion test
Hydraulic test
Ultrasonic test
Vortex sparseness test
Glass erosion test
8.4 Retest and judgment rules
Test method
GB/T 223.GB/T 11170
GB/T6397,GB/T228
GR/T216
GH/T 242
GB/T 241
GB /T 5777
GB/T 7735
GB/T 4334. 1--4334. G
Accuracy: 0. 01 mm Measuring tools
The re-inspection and judgment rules of steel pipes shall be in accordance with the relevant provisions of GB/T2102. 9 Packaging, marking and quality certificate
Sampling quantity
Each furnace (tank) 1 pcs
2 pcs per batch
2 pcs of Haipi
2 pcs per batch
2 pcs per batch
Packaging, marking and quality certificate of steel pipes It should comply with the relevant provisions of GB/T 2102. Sampling method
GR/T222
Different steel pipesGB/T2975
Different steel pipes
Different steel pipes||tt| | Different roots of steel6. The specific corrosion test method shall be agreed upon by both parties and indicated in the contract. If not specified, it shall be carried out in accordance with the test provisions of GB/T4334.5. 6.7 Surface quality
6.7.1 There shall be no cracks, folds, rolls, delamination and scarring on the inner and outer surfaces of the steel pipe. These defects shall be completely removed, and the removal depth shall not exceed the negative deviation of the nominal wall thickness. The actual wall thickness at the cleaned location shall not be less than the minimum value allowed by the wall thickness. 6.7.2 On the inner and outer surfaces of the steel pipe, the allowable depth of the straight line is as follows: Hot-rolled (extruded, expanded) steel pipe: not more than 5% of the nominal wall thickness. For steel pipes with a diameter less than or equal to 140 III, the maximum allowable depth is not more than 0.5 mm; for steel pipes with a diameter greater than 140 mm, the maximum allowable depth is not more than 0.8 mm. Cold-drawn (rolled) steel pipe: not more than 4% of the nominal wall thickness (the allowable depth of the straight line for wall thickness less than 1.4 mm is 0.05 mm), and the maximum depth is not more than 0.30 mm.
6.7.3 Other defects that do not exceed the negative deviation of the step thickness are allowed to exist. 6.7.4 For steel pipes for machining, as long as the supplier can ensure that the depth of the above defects is within the machining allowance range, it is not necessary to remove them.
7 Test methods
The test methods for various inspections of steel pipes shall comply with the provisions of Table 5. 8 Inspection rules
8.1 Inspection and acceptance
The inspection and acceptance of steel pipes shall be carried out by the technical supervision department of the supplier. 8.2 Batch rules
GB/T14975—2002
Steel pipes shall be inspected and accepted in batches. Each batch of steel pipes shall be of the same brand, same furnace number, same specification and same heat treatment system (furnace). The quantity of each batch of steel pipes shall not exceed the following regulations: outer diameter 76mm, wall thickness 3nm-..
outer diameter 351mm.
other sizes:
8.3 Sampling quantity
·500 pieces;
50 pieces;
?200 pieces,
the sampling quantity for each inspection of each batch of steel pipes shall be The provisions of Table 5 shall apply. Table 5 Inspection items, sampling quantity and test methods for steel pipes No. Inspection item Month Chemical composition Tensile test Fan pressure test Expansion test Hydraulic test Ultrasonic test Vortex sparseness test Crystal corrosion test 8.4 Re-inspection and judgment rules Test method GB/T 223.GB/T 11170
GB/T6397,GB/T228
GR/T216
GH/T 242
GB/T 241
GB/T 5777
GB/T 7735
GB/T 4334. 1--4334. G
Accuracy: 0. 01 mm Measuring tools
The re-inspection and judgment rules of steel pipes shall be in accordance with the relevant provisions of GB/T2102. 9 Packaging, marking and quality certificate
Sampling quantity
1 per furnace (tank)
2 per batch
2 per batch
The packaging, marking and quality certificate of steel pipes shall comply with the relevant provisions of GB/T 2102. Sampling method
GR/T222
Different steel pipesGB/T2975
Different steel pipes
Different steel pipes
Different steel pipes6. The specific corrosion test method shall be agreed upon by both parties and indicated in the contract. If not specified, it shall be carried out in accordance with the test provisions of GB/T4334.5. 6.7 Surface quality
6.7.1 There shall be no cracks, folds, rolls, delamination and scarring on the inner and outer surfaces of the steel pipe. These defects shall be completely removed, and the removal depth shall not exceed the negative deviation of the nominal wall thickness. The actual wall thickness at the cleaned location shall not be less than the minimum value allowed by the wall thickness. 6.7.2 On the inner and outer surfaces of the steel pipe, the allowable depth of the straight line is as follows: Hot-rolled (extruded, expanded) steel pipe: not more than 5% of the nominal wall thickness. For steel pipes with a diameter less than or equal to 140 III, the maximum allowable depth is not more than 0.5 mm; for steel pipes with a diameter greater than 140 mm, the maximum allowable depth is not more than 0.8 mm. Cold-drawn (rolled) steel pipe: not more than 4% of the nominal wall thickness (the allowable depth of the straight line for wall thickness less than 1.4 mm is 0.05 mm), and the maximum depth is not more than 0.30 mm.
6.7.3 Other defects that do not exceed the negative deviation of the step thickness are allowed to exist. 6.7.4 For steel pipes for machining, as long as the supplier can ensure that the depth of the above defects is within the machining allowance range, it is not necessary to remove them.
7 Test methods
The test methods for various inspections of steel pipes shall comply with the provisions of Table 5. 8 Inspection rules
8.1 Inspection and acceptance
The inspection and acceptance of steel pipes shall be carried out by the technical supervision department of the supplier. 8.2 Batch rules
GB/T14975—2002
Steel pipes shall be inspected and accepted in batches. Each batch of steel pipes shall be of the same brand, same furnace number, same specification and same heat treatment system (furnace). The quantity of each batch of steel pipes shall not exceed the following regulations: outer diameter 76mm, wall thickness 3nm-..
outer diameter 351mm.
other sizes:
8.3 Sampling quantity
·500 pieces;
50 pieces;
?200 pieces,
the sampling quantity for each inspection of each batch of steel pipes shall be The provisions of Table 5 shall apply. Table 5 Inspection items, sampling quantity and test methods for steel pipes No. Inspection item Month Chemical composition Tensile test Fan pressure test Expansion test Hydraulic test Ultrasonic test Vortex sparseness test Crystal corrosion test 8.4 Re-inspection and judgment rules Test method GB/T 223.GB/T 11170
GB/T6397,GB/T228
GR/T216
GH/T 242
GB/T 241
GB/T 5777
GB/T 7735
GB/T 4334. 1--4334. G
Accuracy: 0. 01 mm Measuring tools
The re-inspection and judgment rules of steel pipes shall be in accordance with the relevant provisions of GB/T2102. 9 Packaging, marking and quality certificate
Sampling quantity
1 per furnace (tank)
2 per batch
2 per batch
The packaging, marking and quality certificate of steel pipes shall comply with the relevant provisions of GB/T 2102. Sampling method
GR/T222
Different steel pipesGB/T2975
Different steel pipes
Different steel pipes
Different steel pipes
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.