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GB/T 37605-2019 PDF in English


GB/T 37605-2019 (GB/T37605-2019, GBT 37605-2019, GBT37605-2019)
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GB/T 37605-2019: PDF in English (GBT 37605-2019)

GB/T 37605-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.99;77.140.75
H 59
Welded corrosion resistant alloy pipes and tubes
ISSUED ON: AUGUST 30, 2019
IMPLEMENTED ON: JULY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Order content ... 6 
4 Size, shape, weight and allowable deviation ... 7 
5 Technical Requirements ... 7 
6 Test method ... 12 
7 Inspection rules ... 14 
8 Packaging, marking and quality certificate ... 14 
Welded corrosion resistant alloy pipes and tubes
1 Scope
This Standard specifies the order content, size, shape, weight, technical
requirements, test methods, inspection rules, packaging, marking and quality
certificates of welded corrosion resistant alloy pipes and tubes.
This Standard applies to welded corrosion resistant alloy pipes and tubes
(hereinafter referred to as welded pipes) whose alloy designations are NS1101,
NS1102, NS1104, NS1402, NS1403, NS3102, NS3304, NS3306, NS6400.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
GB/T 223.3, Methods for chemical analysis of iron, steel and alloy - The
diantipyrylmethane phosphomolybdate gravimetric method for the
determination of phosphorus content
GB/T 223.8, Methods for chemical analysis of iron, steel and alloy - The
sodium fluoride separation. EDTA titration method for the determination of
aluminium content
GB/T 223.11, Iron, steel and alloy. Determination of chromium content -
Visual titration or potentiometric titration method
GB/T 223.13, Methods for chemical analysis of iron, steel and alloy - The
ammonium ferrous sulfate titration method for the determination of vanadium
content
GB/T 223.17, Methods for chemical analysis of iron, steel and alloy - The
diantipyrylmethane photometric method for the determination of titanium
content
GB/T 223.18, Methods for chemical analysis of iron steel and alloy - The
sodium thiosulfate separation iodimetric method for the determination of
cupper content
GB/T 223.21, Methods for chemical analysis of iron steel and alloy - The 5-
CL-PADAB spectrophotometric method for the determination of cobalt
content
GB/T 2975, Steel and steel products. Location and preparation of samples
and test pieces for mechanical testing
GB/T 4340.1, Metallic materials. Vickers hardness test - Part 1: Test method
GB/T 6394, Determination of estimating the average grain size of metal
GB/T 7735-2016, Automated eddy current testing of seamless and welded
(except submerged arc-welded) steel tubes for detection of imperfections
GB/T 11170, Stainless steel - Determination of multi-element contents. Spark
discharge atomic emission spectrometric method (Routine method)
GB/T 15007, Designations of corrosion-resistant alloy
GB/T 15260-2016, Standard Test Method for Intergranular Corrosion of
Nickel Alloys by Corrosion of Metals and Alloys
GB/T 20066, Steel and iron. Sampling and preparation of samples for the
determination of chemical composition
GB/T 20123, Steel and iron. Determination of total carbon and sulfur content
Infrared absorption method after combustion in an induction furnace (routine
method)
GB/T 37612, Corrosion-resistant alloy wires for welding
GB/T 37792, General technical specification for welded corrosion resistant
alloy pipes and tubes
NB/T 47013.2-2015, Nondestructive testing of pressure equipment - Part 2:
Radiographic testing
NB/T 47013.5-2015, Nondestructive testing of pressure equipment - Part 5:
Penetrant testing
NB/T 47013.11-2015, Nondestructive Testing of Pressure Equipment - Part
11: Standard practice for X-ray digital radiography
3 Order content
The contract or order that orders welded pipes in accordance with this Standard
shall include the following information:
a) number of this Standard;
b) product name:
Welded pipes whose nominal outer diameter (D) is not greater than 168.3 mm
shall be subjected to a flaring test. The test requirements shall comply with the
provisions of GB/T 37792; the sample after flaring shall not have cracks or gaps.
5.5.3 Bend test on welded joints
Welded pipes whose nominal outer diameter (D) is not greater than 168.3 mm
shall be subjected to a bend test on welded joints. The test requirements shall
comply with the provisions of GB/T 37792; the sample after bending shall not
have cracks or gaps.
5.6 Grain size
5.6.1 NS1102 and NS1104-designation welded pipes shall be examined for
grain size; the average grain size shall be level 5 or thicker.
5.6.2 According to the requirements of the buyer, if it is specified in the contract,
welded pipes of other designations can also be tested for grain size. The
average grain size qualified level is determined by the supplier and the buyer.
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. For welded pipes whose nominal outer diameter is not more than 50.8
mm, it’s available to use a gas tightness test to replace the hydraulic test. The
test requirements shall be in accordance with the provisions of GB/T 37792.
5.7.2 The supplier may use eddy current testing to replace the hydraulic test.
For eddy current testing, the artificial defects of the comparative sample tube
shall comply with the acceptance level E4H or E4 in GB/T 7735-2016.
5.8 Radiographic testing
5.8.1 Welded pipes whose nominal outer diameter (D) is not greater than 168.3
mm shall be subjected to a full-length weld joint radiographic testing. The
radiographic testing is carried out according to the provisions of NB/T 47013.2-
2015 or NB/T 47013.11-2015. The level of inspection technology shall be in
accordance with Class AB, and the quality level shall meet the requirements of
Level II.
5.8.2 According to the requirements of the buyer, if it is negotiated between the
buyer and the supplier AND indicated in the contract, it’s also available to use
other radiographic testing methods or acceptance requirements.
5.8.3 The radiographic testing may be performed before the heat treatment.
5.9 Intergranular corrosion
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.