GB/T 37605: Evolution and historical versions
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Basic data | Standard ID | GB/T 37605-2025 (GB/T37605-2025) | | Description (Translated English) | Welded corrosion resistant alloy pipes and tubes | | Sector / Industry | National Standard (Recommended) | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 37605-2019, GB/T 37792-2019, GB/T 38682-2020 | GB/T 37605-2019: Welded corrosion resistant alloy pipes and tubes---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Welded corrosion resistant alloy pipes and tubes
ICS 77.140.99; 77.140.75
H59
National Standards of People's Republic of China
Corrosion resistant alloy welded pipe
Published on.2019-08-30
2020-07-01 implementation
State market supervision and administration
China National Standardization Administration issued
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Iron and Steel Association.
This standard is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This standard was drafted. Zhejiang Jiuli Special Materials Technology Co., Ltd., Jiangsu Wujin Stainless Co., Ltd., Shanxi Taigang Stainless Steel
Steel Tube Co., Ltd., Metallurgical Industry Information Standards Institute.
The main drafters of this standard. Xu Quanguang, Ji Hai, Yan Yuming, Cheng Jian, Wang Bowen, Xu Qi, Xu Amin, Kang Xitang, Liu Xiankun, Wang Xinhe.
Corrosion resistant alloy welded pipe
1 Scope
This standard specifies the order content, size, shape, weight, technical requirements, test methods, inspection rules, packaging, and marking of corrosion-resistant alloy welded pipes.
Zhihe quality certificate.
This standard applies to alloy grades NS1101, NS1102, NS1104, NS1402, NS1403, NS3102, NS3304, NS3306,
NS6400 corrosion resistant alloy welded pipe (hereinafter referred to as welded pipe).
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 223.3 Methods for chemical analysis of steels and alloys - Determination of phosphorus content by diantipyrine methane phosphomolybdate gravimetric method
GB/T 223.8 Methods for chemical analysis of steels and alloys - Determination of aluminium content by sodium sulphate separation - EDTA titration
GB/T 223.11 Determination of chromium content in steels and alloys - either titration or potentiometric titration
GB/T 223.13 Methods for chemical analysis of steels and alloys - Determination of vanadium content by ferrous ammonium sulphate titration
GB/T 223.17 Methods for chemical analysis of steels and alloys - Determination of titanium content by diantipyrylmethane photometric method
GB/T 223.18 Methods for chemical analysis of steels and alloys - Separation of sodium thiosulfate - Iodometric method
GB/T 223.21 Methods for chemical analysis of steels and alloys - 5-Cl-PADAB spectrophotometric method
GB/T 223.23 Determination of nickel content in steels and alloys - succinimide spectrophotometric method
GB/T 223.26 Determination of molybdenum content of steels and alloys - thiocyanate spectrophotometric method
GB/T 223.40 Determination of bismuth content of steels and alloys - s
GB/T 223.60 Steel and alloys - Determination of silicon content by perchloric acid dehydration gravimetric method
GB/T 223.64 Determination of manganese content in steels and alloys - Flame atomic absorption spectrometry
GB/T 223.67 Determination of sulphur content of steels and alloys
GB/T 223.69 Determination of carbon content of steel and alloys
GB/T 223.79 Determination of multi-element content of iron and steel by X-ray fluorescence spectrometry (conventional method)
GB/T 228.1 tensile testing of metallic materials - Part 1
GB/T 228.2 tensile testing of metallic materials - Part 2.
GB/T 230.1 Rockwell hardness test for metallic materials - Part 1. Test methods
GB/T 231.1 Brinell hardness test for metallic materials - Part 1. Test methods
GB/T 241 metal pipe hydraulic test method
GB/T 242 metal tube flare test method
GB/T 246 metal material tube flattening test method
GB/T 2102 steel pipe acceptance, packaging, marking and quality certificate
GB/T 2651 welded joint tensile test method
GB/T 2653 welded joint bending test method
GB/T 2975 steel and steel products mechanical properties test sampling position and sample preparation
GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1. Test method
GB/T 6394 method for determination of average grain size of metals
GB/T 7735-2016 Automatic eddy current testing for seamless and welded (except submerged arc welding) steel pipe defects
GB/T 11170 Determination of multi-element content of stainless steels. Spark discharge atomic emission spectrometry (conventional method)
GB/T 15007 corrosion resistant grade
GB/T 15260-2016 Corrosion test method for corrosion of nickel alloys of metals and alloys
GB/T 20066 Sampling and sample preparation method for samples for determination of chemical composition of steel and iron
GB/T 20123 Determination of total carbon and sulfur content of steels - Infrared absorption method after high-frequency induction furnace combustion (conventional method)
GB/T 37612 corrosion resistant alloy wire
GB/T 37792 Corrosion-resistant alloy welded pipe general technical conditions
NB/T 47013.2-2015 Non-destructive testing of pressure equipment - Part 2. Radiographic testing
NB/T 47013.5-2015 Non-destructive testing of pressure equipment - Part 5. Penetration testing
NB/T 47013.11-2015 Non-destructive testing of pressure equipment - Part 11. X-ray digital imaging
3 Ordering content
Contracts or orders for ordering welded pipes in accordance with this standard shall include the following.
a) the standard number;
b) product name;
c) alloy grades;
d) the quantity delivered (total weight or total length);
e) size specifications;
f) delivery status;
g) Special requirements.
4 size, shape, weight and tolerance
The size, shape, weight and tolerance of the welded pipe shall comply with the provisions of GB/T 37792.
5 Technical requirements
5.1 Brand and chemical composition
5.1.1 The grade and chemical composition of the alloy shall comply with the requirements of Table 1. According to the requirements of the purchaser, the supplier can supply the cards outside the table 1 after negotiation between the supplier and the buyer.
No. welded pipe.
5.1.2 The allowable deviation of the chemical composition of the finished pipe shall comply with the provisions of GB/T 15007.
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5.2 Manufacturing methods
5.2.1 Smelting method
The alloy shall be smelted by means of electric arc furnace plus refining and electric slag remelting, or other smelting parties that can meet the requirements of this standard.
law. The smelting method should be indicated in the quality certificate.
5.2.2 Pipe making method
The manufacturing method of the welded pipe shall comply with the provisions of GB/T 37792. If you need to add filler metal, you can use the filler material recommended in Table 2.
Filler materials with a higher alloy content may also be selected, and the filler metal materials shall comply with the provisions of GB/T 37612.
Table 2 Base metal and filler metal materials
Serial number
Welded pipe base metal
Unified digital code number
Filled metal material
1 H08800 NS1101 HNS3106
2 H08810 NS1102 HNS3106a
3 H08811 NS1104 HNS3106a
4 H08825 NS1402 HNS3306
5 H08020 NS1403 HNS1403
6 H06600 NS3102 HNS3106
7 H10276 NS3304 HNS3304
8 H06625 NS3306 HNS3306
9 H04400 NS6400 HNS6060
a The use temperature does not exceed 800 °C. If it exceeds 800 °C, the filler metal should be selected according to the specific project design.
5.3 Delivery status
The welded pipe shall be delivered in a heat-treated and pickled state. The recommended heat treatment system can be found in Table 3. Whole polished, polished or protected atmosphere
The treated welded pipe can be washed without pickling. Other states of delivery may also be used upon negotiation between the supplier and the buyer.
5.4 Mechanical properties
The tensile test of the welded pipe and the tensile test of the welded joint shall be carried out in accordance with the provisions of GB/T 37792, and the results shall comply with the requirements of Table 3.
Table 3 Recommended heat treatment system and mechanical properties
Serial number
Uniform number
Word code
Recommended heat treatment system/°C
Room temperature mechanical properties
tensile strength
Rm/MPa
Plastic extension strength
Rp0.2/MPa
Elongation after break
A/%
not less than
1 H08800 NS1101 ≥1040, quenching 520 205 30
2 H08810 NS1102 ≥1120, quenching 450 170 30
3 H08811 NS1104 ≥1150, quenching 450 170 30
Table 3 (continued)
Serial number
Uniform number
Word code
Recommended heat treatment system/°C
Room temperature mechanical properties
tensile strength
Rm/MPa
Plastic extension strength
Rp0.2/MPa
Elongation after break
A/%
not less than
4 H08825 NS1402 930~980, quenching 586 240 30
5 H08020 NS1403 930~1010, quenching 551 241 30
6 H06600 NS3102 980~1010, quenching 550 240 30
7 H10276 NS3304 ≥1120, quenching 690 283 40
8 H06625 NS3306
Solution treatment. ≥1090, quenching 690 276 30
Annealing treatment. ≥ 870, quenching 827 414 30
9 H04400 NS6400
Annealing treatment. D≤127mm,
900~930, quenching
Annealing treatment. D >127mm,
900~930, quenching
Stress relief treatment. 540~565, quenching 585 380 15
5.5 Process performance
5.5.1 Flattening test
Welded pipes with a nominal outer diameter (D) not greater than 168.3 mm shall be subjected to a flattening test. The test requirements shall comply with the provisions of GB/T 37792, test
There should be no cracks or cracks in the specimen after the test.
5.5.2 Flaring test
A welded pipe with a nominal outer diameter (D) of not more than 168.3 mm shall be subjected to a flare test. The test requirements shall comply with the provisions of GB/T 37792,
There should be no cracks or cracks in the sample after the mouth.
5.5.3 Welding joint bending test
Welded joints with a nominal outer diameter (D) greater than 168.3 mm shall be subjected to a welded joint bending test. Test requirements shall be in accordance with GB/T 37792
It is stipulated that the specimen shall not show cracks or cracks after bending.
5.6 grain size
5.6.1 NS1102 and NS1104 grade welded pipes shall be examined for grain size, and the average grain size shall be 5 or thicker.
5.6.2 According to the requirements of the purchaser and stated in the contract, the other grades of welded pipes can also be tested for grain size, and the average grain size is qualified.
It needs to be determined by both parties.
5.7 Hydraulic test
5.7.1 The welded pipe shall be subjected to a hydraulic test. The test requirements shall be implemented in accordance with the provisions of GB/T 37792. The nominal outer diameter is not more than 50.8mm
The welded pipe can be replaced by a gas tightness test instead of the hydraulic test. The test requirements should be carried out in accordance with the provisions of GB/T 37792.
5.7.2 The supplier may use eddy current testing instead of hydraulic test. For eddy current testing, the artificial defects of the comparative sample tube should meet the requirements of GB/T 7735-2016.
Acceptance level E4H or E4.
5.8 Radiation detection
5.8.1 For welded pipes with a nominal outer diameter (D) greater than 168.3 mm, full-length weld inspection of the weld shall be carried out. Radiation detection according to NB/T 47013.2-2015
Or the test of NB/T 47013.11-2015. The level of inspection technology should be in accordance with Class AB, and the quality level should meet the requirements of Level II.
5.8.2 According to the requirements of the purchaser, after consultation between the supplier and the buyer, and in the contract, other radiographic methods and acceptance requirements may also be used.
5.8.3 Radiation inspection can be performed prior to heat treatment.
5.9 Intergranular corrosion
The intergranular corrosion test of NS1403 welded pipe shall be carried out according to the B method in GB/T 15260-2016, and the corrosion rate shall not exceed 0.05 mm/
month. After consultation between the supplier and the buyer, and indicated in the contract, other intergranular corrosion test methods may be used.
5.10 Surface quality
5.10.1 The surface quality of the welded pipe shall comply with the provisions of GB/T 37792.
5.10.2 After the surface defects of the welded pipe are repaired, liquid penetrant inspection shall be carried out. The test results shall be in accordance with Class II of NB/T 47013.5-2015.
Provisions.
5.11 Special requirements
According to the requirements of the purchaser, after the supply and demand sides negotiate and indicate in the contract, the following inspections can be carried out on the welded pipe.
a) high temperature stretching;
b) hardness;
c) intergranular corrosion (except NS1403 welded pipe);
d) Other special requirements.
6 Test methods
6.1 The inspection items and test methods of welded pipes shall comply with the requirements of Table 4.
6.2 The chemical composition test of steel is generally carried out according to GB/T 223.79, GB/T 11170, GB/T 20123 or general chemical analysis methods.
According to GB/T 223.3, GB/T 223.8, GB/T 223.11, GB/T 223.13, GB/T 223.17, GB/T 223.18,
GB/T 223.21, GB/T 223.23, GB/T 223.26, GB/T 223.40, GB/T 223.60, GB/T 223.64, GB/T 223.67,
The provisions of GB/T 223.69 and GB/T 20123 are carried out.
6.3 The inner and outer surfaces of the welded pipe shall be visually inspected under full lighting conditions. The liquid penetrant inspection shall be in accordance with NB/T 47013.5-2015.
The regulations are carried out.
6.4 The size and shape of the welded pipe shall be measured by the gage which meets the accuracy requirements. Welded pipe with a nominal outer diameter of not less than 508 mm should be taken
Measure the outside diameter with a caliper tape measure.
Table 4 Inspection items, sampling quantities, sampling locations and test methods
Serial number test item sampling quantity sampling part test method
1 Chemical composition 1/furnace GB/T 20066 See 6.2
2 Stretching 2/batch of different welded pipes at room temperature, GB/T 2975 GB/T 228.1
3 welded joint stretch 1/batch
Welding joints for welded test plates or welded pipes,
GB/T 2651
GB/T 2651
4 flattening test 2/batch of different welded pipe on GB/T 246
5 flaring test 2/batch of different welded pipe on GB/T 242
Table 4 (continued)
Serial number test item sampling quantity sampling part test method
6 Welded joints are bent in each batch and take a set of 2 samples on different welded pipes, GB/T 2653 GB/T 2653
7 grain size 1/batch on one of the welded pipes, GB/T 6394 GB/T 6394
8 Hydraulic test by section - GB/T 241
9 air tightness test by section - see 5.7.1
10 Eddy current testing by branch - GB/T 7735-2016
11 ray detection by branch -
NB/T 47013.2-2015,
NB/T 47013.11-2015
12 High temperature stretching on both sides of different welded pipes, GB/T 2975 GB/T 228.2
13 hardness is negotiated on different welded pipes
GB/T 230.1, GB/T 231.1,
GB/T 4340.1
14 intergranular corrosion 1/batch of any welded pipe on GB/T 15260-2016
15 Surface quality by cost - see 6.3
16 size, shape by item - see 6.4
7 Inspection rules
7.1 Inspection and acceptance
The inspection and acceptance of the welded pipe shall be carried out by the supplier's quality and technical supervision department. The purchaser has the right to inspect the welded pipe in accordance with the provisions of this standard.
acceptance.
7.2 Batch rule
In addition to chemical composition, the welded pipe shall be inspected and accepted in batches. Each batch shall be of the same grade, the same heat number, the same specification, the same welding process and
For the same heat treatment system (heating), the number of welded pipes shall not exceed the following.
a) D ≤ 57mm, 400;
b) 57mm \u003cD≤219.1mm,200支;
c) D >219.1mm, 100 pieces.
7.3 Number of samples and sampling locations
The number of samples and sampling locations of the welded pipe inspections shall comply with the requirements of Table 4.
7.4 Re-inspection and decision rules
The re-inspection and determination rules of welded pipes shall comply with the provisions of GB/T 2102.
8 Packaging, sign and quality certificate
The packaging, marking and quality certificate of the welded pipe shall comply with the provisions of GB/T 2102.
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