NB/T 47019.6-2011Purchase technical specification for boiler and heat exchanger tubes/pipes - Part 6: Ferrite/austenite duplex steel (English PDF)
锅炉、热交换器用管订货技术条件 第6部分：铁素体/奥氏体型双相不锈钢
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Issued by
NEA
Level / Type
Industry · Recommended
Issue date
July 1, 2011
Implementation date
October 1, 2011
Scope
NB/T 47019.6-2011 is the English-translated version of 锅炉、热交换器用管订货技术条件 第6部分：铁素体/奥氏体型双相不锈钢.
NB/T 47019.6-2011 is the Chinese standard "Purchase technical specification for boiler and heat exchanger tubes/pipes - Part 6: Ferrite/austenite duplex steel".
Its scope clause reads: This part specifies the designation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate requirements for the ferrite/austenite duplex seamless steel tube used for heater exchanger.
This part applies to the cold drawing (rolling) ferrite/austenite duplex seamless steel tube which is resistant to normal corrosion and stress corrosion. Its clauses include test methods.
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Document preview — NB/T 47019.6-2011
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 methods9
- 7 Inspection rules10
- 8 Packaging, marking and quality certificates11
1 Scope
This part specifies the designation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate requirements for the ferrite/austenite duplex seamless steel tube used for heater exchanger.
This part applies to the cold drawing (rolling) ferrite/austenite duplex seamless steel tube which is resistant to normal corrosion and stress corrosion.
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 (scales A, B, C, D, E, F, G, K, N, T)
GB/T 231.1 Metallic materials - Brinell 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 […]
5.6.2
After the water pressure test, BLOW dry the steel tube; if it cannot ensure
drying, the chlorine ion content in water shall not exceed 25 mg/L.
5.6.3
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 Corrosion test
Through negotiation between both parties, the welded tube may be subjected to the corrosion test, AND the test methods and qualification indicators will be noted in the contract.
5.8 Metallographic test
The steel tube shall be subjected to metallographic structure test, the metallographic structure is ferrite/austenite, AND it is not allowed for the existence of sigma phase. The area content of ferrite in the metallographic structure shall be 40% ~ 60%.
5.9 Non-destructive test
5.9.1
The steel tube shall be subjected to the ultrasonic detection one by one,
AND the longitudinal notch depth level of the contrasting sample tube shall comply with the provisions of L3 in GB/T 5777.
5.9.2
As for the non-destructive test blind test area, through negotiation between both parties, it is allowed to conduct penetration test. The penetration test shall follow the provisions of level I in JB/T 4730.5.
6 Test methods
6.1
The tube size and shape shall be measured one by one through the gauges which comply with the precision requirements.
6.2
The inner and outer surface quality of the tube shall be inspected visually one by one.
6.3
The sampling and test methods for the other inspection items shall comply with the requirements of Table 4.
......
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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