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GB 30813-2014: [GB/T 30813-2014] Welded austenitic stainless steel tubes and pipes for nuclear power plant
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Basic data | Standard ID | GB 30813-2014 (GB30813-2014) | | Description (Translated English) | [GB/T 30813-2014] Welded austenitic stainless steel tubes and pipes for nuclear power plant | | Sector / Industry | National Standard | | Classification of Chinese Standard | H48 | | Classification of International Standard | 77.140.75 | | Word Count Estimation | 20,231 | | Date of Issue | 6/24/2014 | | Date of Implementation | 4/1/2015 | | Quoted Standard | GB/T 222; GB/T 223.11; GB/T 223.16; GB/T 223.18; GB/T 223.19; GB/T 223.21; GB/T 223.22; GB/T 223.23; GB/T 223.25; GB/T 223.26; GB/T 223.28; GB/T 223.36; GB/T 223.37; GB/T 223.58; GB/T 223.59; GB/T 223.60; GB/T 223.62; GB/T 223.63; GB/T 223.64; GB/T 223.68 | | Adopted Standard | EN 10217-2005, NEQ | | Regulation (derived from) | National Standards Bulletin No. 14 of 2014 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Standard specifies the classification of nuclear power plants with austenitic stainless steel welded pipe, code, size, shape, weight and tolerances, technical requirements, test methods, inspection rules, packaging, marking and documentation. This St | GB 30813-2014: [GB/T 30813-2014] Welded austenitic stainless steel tubes and pipes for nuclear power plant
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Welded austenitic stainless steel tubes and pipes for nuclear power plant
ICS 77.140.75
H48
National Standards of People's Republic of China
Nuclear Power Station austenitic stainless steel welded pipe
Issued on. 2014-06-24
2015-04-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Introduction Ⅲ
1 Scope 1
2 Normative references 1
Classification and designation 3 2
4 order contents 2
5 size, shape, weight and tolerances 3
6 Technical requirements 4
7 Test methods 8
8 9 inspection rules
9 cleaning, packaging, marking and documentation 10
Appendix A (normative) intergranular corrosion test 11
Additional requirements in Appendix B (normative) ray detector 12
Foreword
This standard 5.1.2,5.4,5.5,6.1,6.4.1.2,6.4.2,6.5,6.9, Chapter 7, Chapter 8, Chapter 9 is mandatory, the rest are
Recommended.
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
The standard reference to EN10217-7.2005 "Pressure welded steel tubes - Part 7 - Technical delivery conditions. stainless steel tube" to develop.
The standard proposed by China Iron and Steel Association.
This standard by the National Steel Standardization Technical Committee (SAC/TC183) centralized.
This standard was drafted. Zhejiang Jiuli Special Materials Technology Co., Ltd., Jiangsu Wujin Stainless Steel Co., Ltd., metallurgical industry-standard information
Associate Research Institute, Suzhou Thermal Power Research Institute Co., Ltd., Shanxi Taigang Stainless Steel Co., Ltd..
The main drafters of this standard. Jihai, Shao Yu, Song Jianxin, Li Dong, Zhao positions, Kang Xi Tang, Shen Yun, Liu Jun, Wang Gang Gan, Zhou Zhibin, Lu Fenghui.
Nuclear Power Station austenitic stainless steel welded pipe
1 Scope
This standard specifies the classification of nuclear power plants with austenitic stainless steel welded pipe, code, size, shape, weight and tolerances, to technology
Requirements, test methods, inspection rules, packaging, marking and documentation.
This standard applies to nuclear power plant nuclear safety and non-nuclear Class 2,3 safety device level pressure parts made of austenitic stainless steel welded pipe.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 222 chemical composition of finished steel tolerance
Determination of GB/T 223.11 steel and alloy chromium content of visual titration or potentiometric titration
Spectrophotometric determination of titanium content GB/T 223.16 Methods for chemical analysis of iron, steel and alloy The chromotropic acid
GB/T 223.18 Methods for chemical analysis of iron, steel and alloy The sodium thiosulfate separation - determination of copper content Iodometry
GB/T 223.19 Methods for chemical analysis of iron, steel and alloy neocuproine - chloroform extraction spectrophotometric determination of copper content
GB/T 223.21 Methods for chemical analysis of iron, steel and alloy 5-Cl-PADAB spectrophotometric determination of cobalt content
GB/T 223.22 Methods for chemical analysis of iron, steel and alloy nitroso R salt spectrophotometric determination of cobalt content
GB/T 223.23 steel and alloy - Determination of nickel content dimethylglyoxime spectrophotometry
Determination of nickel content GB/T 223.25 Methods for chemical analysis of iron, steel and alloy dimethylglyoxime gravimetric method
GB/T 223.26 steel and alloy - Determination of molybdenum content - Thiocyanate spectrophotometric
GB/T 223.28 Determination of molybdenum steel and alloy chemical analysis method α- benzoin gravimetric method
GB/T 223.36 Methods for chemical analysis of iron, steel and alloy distillation - neutralization titration method for the determination of nitrogen
GB/T 223.37 Methods for chemical analysis of iron, steel and alloy distillation - indophenol blue photometric method for the determination of nitrogen
GB/T 223.58 Methods for chemical analysis of iron, steel and alloys of sodium arsenite - sodium nitrite determination of manganese content titration
GB/T 223.59 Steel and Alloy Determination of phosphorus content by bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometry
GB/T 223.60 Methods for chemical analysis of iron, steel and alloy perchloric acid dehydration gravimetric method for the determination of silicon content
GB/T 223.62 Methods for chemical analysis of iron, steel and alloy butyl acetate extraction spectrophotometric determination of phosphorus content
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy The sodium (potassium) for Determination of amount
GB/T 223.64 steel and alloy manganese content - Flame Atomic Absorption Spectrometry
Determination of sulfur content of potassium iodate titration method after GB/T 223.68 Methods for chemical analysis of iron, steel and alloy tube furnace combustion
GB/T 223.69 after carbon and alloy steel - Determination of the pipe furnace combustion gas volumetric method
GB/T 223.72 steel and alloy sulfur content - Gravimetric method
GB/T 223.75 Determination of methanol distillation steel and alloy of boron content - Curcumin spectrophotometric
GB/T 223.84 steel and titanium alloys - Determination of two methane antipyrine spectrophotometry
After GB/T 223.85 steel and alloy sulfur content induction furnace combustion infrared absorption method
After the determination of GB/T 223.86 total carbon content and alloy steel induction furnace combustion infrared absorption method
RT Test Method. Test Part 1 GB/T 228.1 metallic materials tensile
GB/T 229 metal Charpy pendulum impact test method
GB/T 232 metallic materials - Bend test
GB/T 241 metal pipe Hydrostatic pressure testing
GB/T 246 metal pipe Flattening test methods
GB/T 2102 Acceptance, packing, marking and quality certification
GB/T 2650 welded joint impact test
GB/T 2975 Steel and steel products for mechanical testing and sample preparation position
GB/T 3323 metal fusion welded joints radiography
Intergranular corrosion of stainless steel crystal GB/T 4334-2008 Corrosion of metals and alloys - Test methods
GB/T 4338 high-temperature metallic materials - Tensile testing
GB/T 6394 Determination of average grain size of metal
GB/T 7735 steel pipe eddy current testing method
GB/T 11170 Determination of multi-element stainless steel spark discharge atomic emission spectrometry (Routine method)
GB/T 20066 Steel and iron - Sampling and determination of the chemical composition of the sample with a sample preparation method
GB/T 20123 Steel - Determination of total carbon and sulfur content of the high-frequency induction furnace combustion infrared absorption method (conventional method)
GB/T 20124 Steel - Determination of nitrogen content of inert gas fusion thermal conductivity method (conventional method)
GB/T 21835 welded steel pipe size and weight per unit length
JB/T 4730.3 Non-destructive testing of pressure equipments - Part 3. Ultrasonic testing
JB/T 4730.5 Non-destructive testing of pressure equipments - Part 5. penetrant testing
JB/T 7902 NDT radiographic testing linear IQI
3 Classification and designation
3.1 Pipe manufacturing methods fall into two categories by product, category and symbol.
a) the state of welding. H;
b) heat treatment. T.
3.2 The following codes apply to this part.
D. outside diameter (nominal diameter, unless otherwise specified or the calculated diameter, is calculated nominal diameter or outside diameter).
S. Wall thickness (unless otherwise specified nominal wall thickness or wall thickness calculation, the calculation is the nominal wall thickness or wall thickness).
4 ordering content
Pipe ordered under this standard contract or order should include the following.
a) the standard number;
b) the product name;
c) nuclear safety level;
d) steel grades;
e) Dimensions (diameter × wall thickness, in millimeters);
f) Order number (total weight or length);
g) Delivery status;
h) special requirements.
5 size, shape, weight and tolerance
5.1 diameter and wall thickness
5.1.1 pipe sizes in the range of the outer diameter (D) is not greater than 1219mm, wall thickness (S) is not greater than 50mm, its dimensions should be consistent
GB/T 21835 requirements.
According to the requirements, negotiated by both sides, we can supply other than the GB/T 21835 provisions sizes of pipe.
5.1.2 pipe diameter and wall thickness tolerances shall comply with the provisions in Table 1.
Table 1 of the diameter and wall thickness tolerances in millimeters
No. nominal diameter
Outside diameter tolerance Wall thickness tolerance a
Non-nuclear Nuclear Safety Class 2,3 Class 2,3 safety level of nuclear safety non-nuclear security level
1 ≤168.3 ± 0.5% D ± 0.75% D
2 > 168.3 ± 0.5% D ± 1% D
10% S
-0.35 ± 10% S
In addition to a weld zone thickness.
5.2 roundness
According to the requirements, negotiated by both sides, and specified in the contract, the roundness of the tubes shall not exceed the outer diameter tolerances.
5.3 length
5.3.1 usual length
Pipe length is generally 4000mm ~ 12000mm.
5.3.2 cut length and double length
According to the requirements, negotiated by both sides, and specified in the contract, the supply cut-length or double length of the pipe. Pipe set
Foot length tolerance is 10 0 mm. Each double length should stay out of the incision margin 5mm ~ 10mm.
5.4 curvature
Curvature of the pipe should be less than 1.5mm/m, total length of curvature should not exceed 0.10% of the total pipe length.
5.5 tip shape
Pipe ends and pipe end should be perpendicular to the axis, cut burr should be removed.
5.6 Delivery Weight
Pipe shall theoretical weight delivery, can also be agreed between the actual weight of the delivery. Steel pipe theoretical weight per meter according to equation (1)
Calculated.
W =
1000ρS
(DS) (1)
Where.
The W --- theoretical weight per meter pipe, in kilograms per meter (kg/m);
π --- 3.1416;
Density ρ --- steel (see Table 3), in kilograms per cubic decimeter (kg/dm3);
S --- nominal pipe wall thickness, in millimeters (mm);
D --- steel pipe nominal outside diameter in millimeters (mm).
6 Technical Requirements
Grades and chemical composition of the steel 6.1
6.1.1 Steel grades and chemical composition (melting analysis) should meet the requirements of Table 2.
6.1.2 should be finished steel chemical composition analysis. Nuclear Safety Class 2,3 finished steel chemical composition shall comply with the requirements of Table 2; non-nuclear security
Full grade steel chemical composition of the finished product tolerances shall comply with the provisions of GB/T 222's.
6.2 Manufacturing Methods
6.2.1 Manufacturing Outline
Former steel manufacturing, the manufacturer shall establish manufacturing outline, which should include the welding procedure qualification and fabrication processes before the press has cis
Various manufacturing and inspection process sequence.
6.2.2 steel smelting method
EAF steel should be used to add external refining or remelting method of manufacturing.
According to the requirements, negotiated by both sides, and specified in the contract, may be more demanding other smelting methods.
(Quality
) A
Si
, C
Sb
, C
Ni
Cr
Cu
Ti
S3
Cr
Ni
.08
.75
.00
.03
.01
.00
.00
.00
.00
S3
2C
r1
Ni
.03
.75
.00
.03
.01
.00
.00
.00
.00
.00
S3
2C
r1
Ni
.03
.75
.00
.03
.01
.00
.00
.50
.00
.08
.00
S3
twenty one
Cr
Ni
Ti
.10
.75
.00
.03
.01
.00
.00
.00
.00
.00
5C
.70
S3
Cr
Ni
o2
.08
.75
.00
.03
.01
.00
.00
.00
.00
.00
.50
S3
2C
r1
Ni
o2
.03
.75
.00
.03
.01
.00
.00
.00
.00
.00
.50
.00
S3
2C
r1
Ni
o2
.03
.75
.00
.03
.01
.50
.50
.00
.20
.25
.75
.08
.00
B /
By
Can
(C
) Containing
.20
Boron
(B
) Containing
.00
, N
Ta
.15
, S
.00
. P
.04
, S
.03
2C
r1
Ni
twenty two
Cr
Ni
Ni
.00
.00
; Non
2C
r1
Ni
o2
Ni
.00
.00
6.2.3 The method of manufacturing a steel pipe
6.2.3.1 filler metal pipe should be added or not added automatic arc welding filler metals manufacturing.
6.2.3.2 When the steel manufacturing process when added filler metal material, filler metal alloy composition of its material should not be less than the base metal.
6.2.3.3 negotiated by both sides, and specified in the contract, you can pipe girth weld or butt double longitudinal seam stitching.
6.3 Delivery Status
6.3.1 pipe shall be a solid solution heat treatment delivery. Solution heat treatment temperature is 1050 ℃ ~ 1150 ℃.
6.3.2 The steel shall be subject to pickling, passivation after delivery. Where it overall grinding, boring or bright heat treatment of steel may pickled delivery.
6.3.3 agreed between manufacturer and specified in the contract manufacturing of steel plate has been solution heat treatment, steel may be used without heat treatment
In welding the state of delivery, but should be flagged "H" on the pipe.
6.4 Mechanical Properties
6.4.1 Tensile Test
6.4.1.1 base metal at room temperature tensile test
Portrait of the base material at room temperature tensile properties shall conform to Table 3. For non-nuclear safety grade steel, the base material can be transversely stretched at room temperature
Test instead of longitudinal tensile test, transverse tensile properties shall conform to Table 3.
6.4.1.2 transverse weld tensile test at room temperature
An outer diameter of not less than 168mm of steel pipe welds should be carried out at room temperature tensile test transverse weld tensile strength should not be less than Table 3 Regulation
Tensile strength of a given base material.
6.4.2 Impact test
Wall thickness of not less than 12mm, and the base material at room temperature tensile elongation after fracture is less than 45% of the Nuclear Safety Class 2,3 pipe should impact test.
Impact test should be separately from each group of three samples in the base material, weld and heat affected zone test. The impact of three sample absorb energy
Average should be in accordance with Table 3, the impact of individual specimens absorbed energy may be less than the value specified in Table 3, but not less than the predetermined value
70%.
Table 3 density mechanical properties of steel and steel
No.
Unified Digital
Code
Trademark
Plastic provisions
Extension strength
Rp0.2 /
MPa
tensile strength
Rm /
MPa
The Elongation
A /
Portrait Landscape
Attack
Energy absorption
KV2 /
Density of steel
ρ /
(Kg/dm3)
1 S30408 06Cr19Ni10 ≥210 ≥520 ≥45 ≥35
2 S30403 022Cr19Ni10 ≥175 ≥490 ≥45 ≥35
3 S30453 022Cr19Ni10N ≥210 ≥520 ≥45 ≥30
4 S32168 06Cr18Ni11Ti ≥220 ≥540 ≥40 ≥30
5 S31608 06Cr17Ni12Mo2 ≥210 ≥520 ≥45 ≥30
6 S31603 022Cr17Ni12Mo2 ≥175 ≥490 ≥45 ≥30
7 S31653 022Cr17Ni12Mo2N ≥220 ≥520 ≥45 ≥30
≥60
7.93
7.90
7.93
8.03
8.00
8.00
8.04
6.5 Process Performance
6.5.1 Flattening test
An outer diameter of not more than 219.1mm pipe should be flattening test. An outer diameter of not more than 50mm steel ring flattening taking samples; outer diameter
Greater than 50mm but not more than 219.1mm take C-shaped steel flattened specimens. During the test, the weld should be in the direction of the force of 90 °.
Heat-treated steel, the sample should be pressed to distance between two flat pipe diameter of 1/3; steel without heat treatment, the samples should be pressed to two flat
Distance between the plates is 2/3 of the pipe diameter.
After flattening, the sample does not allow cracks or gaps.
6.5.2 Weld transverse bending test
6.5.2.1 219.1mm outside diameter greater than the transverse weld pipe bending test should be done. Bend test specimens shall be welded steel plate or interception,
Welded plates shall be the same steel grade, the same heat, the same thickness, the same heat treatment system and the same welding process. For small wall thickness
20mm in steel, should take a bending test, bending test should include a face bend test, a back bend test (steel outer and inner weld
Weld respectively in the maximum bending surface); for pipe wall thickness greater than 20mm, should take two full-thickness side bend test.
6.5.2.2 When a bending test bending the specimen core diameter three times the thickness, the bending angle of 180 °. After bending the sample weld areas allowed
Cracks or gaps.
6.6 intergranular corrosion test
Steel intergranular corrosion test should be done. After the test sample is not allowed to intergranular corrosion tendency test methods in Appendix A.
6.7 hydraulic testing
Steel hydraulic test should be carried out by the root. Test pressure according to equation (2) calculation of the maximum test pressure of 20MPa, the regulator should be less than the time
15s. Under test pressure, pipe leakage is not allowed.
p = 2SR/D (2)
Where.
p --- test pressure in megapascals (MPa);
S --- nominal pipe wall thickness, in millimeters (mm);
D --- steel pipe nominal outside diameter in millimeters (mm);
R --- allowable stress, in megapascals (MPa), nuclear safety grade steel press 2,3 Rp0.2 minimum specified in Table 3, 70%, non-nuclear
Steel security level specified in Table 3 Rp0.2 minimum of 50%.
Grade steel for non-nuclear safety, the need to agree, before use for eddy current testing instead of hydraulic tests. When the eddy current testing, comparative sample tube artificial shortage
Trap shall comply with GB/T 7735 in the acceptance level A.
Water hydraulic test requirements negotiated by both parties and specified in the contract.
6.8 Non-destructive testing
6.8.1-ray inspection
6.8.1.1 Nuclear Safety Class 2,3 full-length weld pipe respond 100%-ray detector. The method of radiographic testing shall comply with Appendix B of Regulation
The remaining requirements set ray detection methods should be consistent with the provisions of GB/T 3323's.
According to the requirements, negotiated by both sides, and specified in the contract, use other methods to detect radiation and/or inspection requirements.
6.8.1.2 According to the requirements, negotiated by both sides, and in the contract, non-nuclear safety grade steel can be welded in accordance with GB/T 3323
Seam-ray detector, the detection rate negotiated by both parties and specified in the contract.
6.8.2 penetrant testing
The outer surface of the pipe weld Nuclear Safety Class 2,3 shall be JB/T 4730.5 liquid penetrant inspection. When penetrant inspection, the size of more than
2mm defects should be recorded; where the presentation of the following defects should be displayed indicating the location and make clear.
--- Linear defect display;
--- Nonlinear defect size exceeds 4mm display;
--- 3 or more than 3 arranged in rows, and the edge spacing is less than 3mm defect display;
--- On a rectangular area of 100cm2, there are a total of eight or more intensive defects revealed that the long side of the rectangle of not more than 20cm,
And the assessment of indications from the most disadvantaged areas.
6.8.3 Ultrasound
For wall thickness of not less than 2,3 nuclear safety 6mm grade steel, they use steel or steel tube (except welds) shall
JB/T 4730.3 ultrasonic testing, acceptance requirements for quality level of not less than two.
According to the requirements, negotiated by both sides, and specified in the contract, other methods may also be used ultrasonic testing and/or inspection requirements.
6.9 surface quality
6.9.1 steel inner and outer surfaces should be smooth, does not allow the existence of stratification, cracks, folds, heavy leather, twist, pickling, descaling and other residues
Hinder defect use. These defects should be completely removed, clear the depth should not exceed the thickness of negative deviation, and its clean-up at the actual wall thickness of not less than
The minimum wall thickness allowed.
6.9.2 Nuclear Safety Class 2,3 steel surface quality should meet the following requirements.
a) the use of comparative specimen or sample tube steel measuring surface roughness Ra, the subject surface should be dry, clean and free of oil, grease and coatings table
The surface roughness Ra should not exceed 12.5μm;
b) within the pipe weld counterpart wrong side of the wall thickness should not exceed 10%, and a maximum of 2.0mm;
c) does not allow the presence of scratches, pitting, pits, collapse, shrink groove, undercut, honeycomb defects, local uplift and slag;
d) When the grinding surface defects at or on the surface quality of doubt, the manufacturer shall be liquid penetrant inspection, liquid penetrant examination shall comply
6.8.2 regulations.
6.9.3 weld defects may be repaired, but the repair should be re-hydraulic testing, heat treatment delivery pipe should be re-heat
Management. 2,3 grade steel for nuclear safety, should be in accordance with 6.8.2 after repair liquid penetrant inspection, welding, but the number should not exceed the same site
2 times.
6.9.4 steel inside and outside weld reinforcement shall meet the following requirements.
a) is not greater than the wall thickness of 8mm steel pipe, weld reinforcement shall not exceed 10% S 0.5mm; steel pipe wall thickness greater than 8mm, weld
Reinforcement should not exceed S/6;
Within the weld reinforcement b) exceeds a predetermined height should be polished to the predetermined range.
6.10 special requirements
According to the requirements, the agreement by both sides, and noted in the contract, increase the following test items.
a) high-temperature tensile test;
b) austenite grain inspection;
c) to check the cleanliness of the steel surface.
7 Test methods
7.1 pipe size and shape should meet the accuracy requirements of the measuring gage by root.
7.2 inner and outer surfaces of the tubes shall visually inspected by the root under sufficient lighting conditions.
7.3 Number of test samples of other steel items, sampling methods and test methods should be consistent with the provisions of Table 4.
Table 4 pipe test items, the number of sampling and testing methods
Test item number number of samples Sampling Methods Test Method
A chemical composition of each heat takes a sample GB/T 20066
GB/T 223, GB/T 11170,
GB/T 20123, GB/T 20124
2 base material at room temperature tensile test each batch of samples from each of a GB/T 2975 GB on two steel/T 228.1
3 transverse weld at room temperature tensile tests on each batch a sample from each of two steel GB/T 2975 GB/T 228.1
4 room temperature impact test each batch of samples from each of three groups of three on a steel pipe
GB/T 2975,
GB/T 2650
GB/T 229, GB/T 2650
5 flattening test each batch of samples from each of a GB/T 246 GB/T 246,6.5.1 on two tubes
6 Weld transverse bending test each batch of samples taken 2 GB/T 232 GB/T 232 on a steel pipe
7 intergranular corrosion test each batch of samples from each one in two tubes
GB/T 4334-2008,
Appendix A
GB/T 4334-2008, Appendix A
8 hydraulic test by root - GB/T 241
9 eddy current testing by the root - GB/T 7735
Ray detector 10 6.8.1 - GB/T 3323, Appendix B
11 Liquid penetrant examination 6.8.2 - JB/T 4730.5,6.8.2
12 Ultrasonic Testing 6.8.3 - JB/T 4730.3
13 high-temperature tensile protocol GB/T 2975 GB/T 4338
Austenite grain size 14 agreement GB/T 6394 GB/T 6394
8 Inspection Rules
8.1 inspection and acceptance
Pipe inspection and acceptance carried out by the supplier quality and technical supervision departments.
8.2 Batch rules
Batches pipe inspection and acceptance. Each batch should be the same brand, the same heat, the same size, the same welding process and the same heat treatment
Pipe system (heats) of the composition. The number of each batch of steel should not exceed the following provisions.
a) is not greater than the outer diameter of 57mm, 400-gen;
b) outer diameter larger than 57mm but not more than 219.1mm, 200 gen;
c) greater than the outer diameter of 219.1mm, 100 roots.
8.3 Number of Samples
The number of samples of each batch of the test pipe shall conform to Table 4.
8.4 reinspection and decision rules
Pipe reinspection shall comply with judgment rules GB/T 2102's.
8.5 Re-heat treatment
Mechanical and technological properties unqualified steel pipes, can be re-heat treatment. After the re-heat-treated steel should submit a new batch test
Income. Re-heat treatment only allowed once.
9 cleaning, packaging, marking and documentation
Use oil-free before packing steel 9.1, dry and clean compressed air or other suitable methods for the inner and outer surfaces of the steel pipe c...
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