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NB/T 47019.6-2011 (NB/T47019.6-2011)

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NB/T 47019.6-2011English90 Add to Cart 0-9 seconds. Auto-delivery. Purchase technical specification for boiler and heater exchanger tubes/pipes. Part 6: Ferrite/austenite duplex steel Obsolete

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NB/T 47019.6-2011: PDF in English (NBT 47019.6-2011)

NB/T 47019.6-2011
ICS 27.060.30
J 75
Purchase technical specification for boiler & heater
exchanger tubes/pipes –
Part 6. Ferrite/austenite duplex steel
ISSUED ON. JULY 01, 2011
Issued by. National Energy Administration
Table of contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 General requirements ... 6 
4 Dimensions and shapes ... 6 
5 Technical requirements ... 7 
6 Test methods ... 9 
7 Inspection rules ... 10 
8 Packaging, marking and quality certificates ... 11 
This standard NB/T 47019-2011 “Purchase technical specification for boiler &
heater exchanger tubes/pipes” was compiled with reference to the European
standard EN, United States standard ASME, Japan standard JIS, and so on,
combining with China's national standards and industry standards, AND the
purchase agreement of boiler and heat exchanger manufacturers.
This standard covers the purchase technical specifications for the steel tubes
and non-ferrous metal tubes which are normally used in boiler, heat exchangers
and other pressure equipment. It is mainly divided into the following eight parts.
- Part 1. General requirements;
- Part 2. Non-alloy and alloy steel with room temperature properties;
- Part 3. Non-alloy and alloy steel with specified elevated temperature
- Part 4. Low alloy steel for low-temperature services.
- Part 5. Stainless steel;
- Part 6. Ferrite/austenitic duplex steel;
- Part 7. Copper and copper alloy tube;
- Part 8. Titanium and titanium alloy.
This part is the sixth part of NB/T 47019-2011. This part mainly makes reference
to SA-789 Seamless and welded ferrite/austenite stainless steel tube for
general use, GB/T 21883 Austenitic – Ferritic (duplex) stainless steel seamless
tubes and pipes, AND other enterprise’s purchase standard. This part totally
lists 4 designations, which mainly considers the utilization demands of duplex
steel in China in the future.
As compared with the domestic and international standards, the main
differences are as follows.
- SPECIFY stricter P, S element limit;
- SPECIFY the inspection of ultrasonic wave test blind area;
- SPECIFY the requirements for the inspection items as agreed between
both parties;
Purchase technical specification for boiler & heater
exchanger tubes/pipes -
Part 6. Ferrite/austenite duplex steel
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 σ 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.
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.