NB/T 47019.5-2011Purchase technical specification for boiler and heat exchanger tubes/pipes - Part 5: Stainless steel (English PDF)
锅炉、热交换器用管订货技术条件 第5部分：不锈钢
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Issued by
NEA
Level / Type
Industry · Recommended
Issue date
July 1, 2011
Implementation date
October 1, 2011
Scope
NB/T 47019.5-2011 is the English-translated version of 锅炉、热交换器用管订货技术条件 第5部分：不锈钢.
NB/T 47019.5-2011 is the Chinese standard "Purchase technical specification for boiler and heat exchanger tubes/pipes - Part 5: Stainless steel".
Its scope clause reads: This part specifies the classification and marking, technical requirements, test methods, inspection rules, packaging, marking and quality requirements for seamless and welded stainless steel tubes.
This part applies to seamless and welded stainless steel tubes for boilers and heat exchangers.
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Document preview — NB/T 47019.5-2011
National Standard of the People's Republic of China
Issued by: National Energy Administration of the People's Republic of China
Contents
- Foreword3
- 1 Scope5
- 2 Normative references5
- 3 General requirements6
- 4 Dimensions and shapes6
- 5 Technical requirements7
- 6 Test methods12
- 7 Inspection rules12
- 8 Packaging, marking and quality certificates14
1 Scope
This part specifies the classification and marking, technical requirements, test methods, inspection rules, packaging, marking and quality requirements for seamless and welded stainless steel tubes.
This part applies to seamless and welded stainless steel tubes for boilers and heat exchangers.
2 Normative references
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223 (all parts) Methods for chemical analysis of iron steel and alloy
GB/T 228 Metallic materials – Tensile testing at ambient temperature
GB/T 230.1 Metallic materials – Rockwell hardness test – Part 1: Test method
GB/T 241 Metal materials – Tube – Hydrostatic pressure test
GB/T 242 Metal materials – Tube – Drift-expending test
GB/T 246 Metal materials – Tube – Flattening test
GB/T 2102 Acceptance packing marking and quality certification of steel pipe
GB/T 2975 Steel and steel products – Location and preparation of test pieces for mechanical testing
GB/T 4334 Corrosion of metals and alloys – Test methods for intergranular corrosion of stainless steel […]
5.5.4 Reverse bending test
As for the tube with the ratio of wall thickness to outer diameter less than 10%
OR the wall thickness less than 3.4 mm OR the outer diameter less than 9.5 mm, it shall be subjected to the reverse bending test. After the test, the sample shall be free from cracks or folding due to inner weld finishing.
5.6 Water pressure test
5.6.1
The steel tube shall be subjected to water pressure test one by one. The maximum test pressure shall not exceed 20 MPa AND the pressure regulation time shall be 10 s.
5.6.2
Where the purchaser has no requirement, the manufacturer may use the eddy current test in lieu of the water pressure test. When the eddy current test is used to replace the water pressure test, the artificial defects of the contrasting sample tube and the acceptance level shall comply with the requirements of level A in GB/T 7735.
5.7 Underwater sealing test
As requested by the purchaser, the welded tube may be subjected to the underwater sealing test in accordance with NB/T 47019.1.
5.8 Intergranular corrosion
The tube shall be, in accordance with the method E of GB/T 4334, subjected to the intergranular corrosion test. If requested by the purchaser AND noted in the contract, it is also allowed to use other intergranular corrosion test methods.
5.9 Non-destructive test
5.9.1
The seamless tube shall be subjected to the ultrasonic detection one by one, AND the longitudinal depth level of the contrasting sample tube shall comply with the provisions of L2.5 in GB/T 5777.
5.9.2
The welded tube shall be subjected to the eddy current test one by one,
AND the artificial defects and acceptance level of the contrasting sample tube shall comply with the provisions of level A in GB/T 7735.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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NB/T 47019.5-2011
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