Source: https://www.chinesestandard.net/PDF/English.aspx/NBT47008-2017
Timestamp: 2019-12-07 03:49:51
Document Index: 75023524

Matched Legal Cases: ['art 0', 'art 1', 'art 2', 'art 3', 'art 4', 'art 5']

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Detail Information of NB/T 47008-2017; NB/T47008-2017
Word Count Estimation: 21,296
Date of Issue: 2017-03-28
Date of Implementation: 2017-08-01
Older Standard (superseded by this standard): NB/T 47008-2010; JB/T 9626-1999
Quoted Standard: GB/T 222; GB/T 223; GB/T 226; GB/T 228.1; GB/T 228.2; GB/T 229; GB/T 231.1; GB/T 4336; GB/T 6394; GB/T 8650; GB/T 10561; GB/T 13298; GB/T 20066; GB/T 20123; GB/T 20124; NB/T 47013.3; NB/T 47013.4; NB/T 47013.5
Administrative Organization: National Boiler and Pressure Vessel Standardization Technical Committee
Regulation (derived from): State Energy Bureau Announcement No. 6 of 2017
Summary: This standard specifies the pressure equipment carbon steel and alloy steel forgings terms and definitions, ordering content, technical requirements, test methods, inspection rules and signs and quality certificates.
Replacing NB/T 47008-2010, JB/T 9626-1999
forgings for pressure equipment
ISSUED ON. MARCH 28, 2017
IMPLEMENTED ON. AUGUST 01, 2017
4 Order content ... 8
6 Test methods ... 17
7 Inspection rules ... 18
8 Markings and quality certificates ... 21
Annex A (informative) Forgings for supporting valves and special components
of boilers ... 22
Annex B (normative) Additional requirements ... 24
Annex C (informative) High temperature mechanical properties ... 26
This Standard is drafted according to the rules given in GB/T 1.1-2009 “Directives for
standardization - Part 1. The structure and drafting of standards”.
This Standard replaces NB/T 47008-2010 “Carbon and alloy steel forgings for pressure
equipment” and incorporates the relevant contents of JB/T 9626-1999 “Specification
for boiler forging”. Compared with NB/T 47008-2010, the main technical changes are
- ADD 5 steel forging designations, i.e. 12CrMo, 30CrMo, 10Cr9MoW2VNbBN,
09CrCuSb, 08Cr2AlMo, and 2 steel forging designations, i.e. 35CrNi3MoV,
36CrNi3MoV, for ultra-high pressure vessels;
- CANCLE the contents of design pressure and design temperature in the scope;
- REFINE the relevant requirements for the order content;
- ADD the requirements for low magnification test;
- ADD the requirements for metallographic examination;
- IMPROVE the quality grade of ultrasonic testing for steel forgings;
- ADD the requirements for hydrogen-induced cracking (HIC) test;
- MODIFY the permissible criteria for welding;
- ADD 6 forging designations, i.e. 25,25Cr2MoV, 25Cr2MolV, 20CrlMolVNbTiB,
20CrlMolVTiB, 38CrMoAl, for supporting valves and special components;
- ADD the table of high temperature mechanical properties of commonly used
forging steels.
Annex A and Annex C of this Standard are informative. Annex B is normative.
This Standard is proposed by and shall be under the jurisdiction of China
Standardization Committee on Boilers and Pressure Vessels (SAC/TC 262).
China Special Equipment Inspection and Research Institute, Shanghai Power
Equipment Research Institute, China First Heavy Industries, Dalian Jinzhou Heavy
Machinery Group Co., Ltd., Zhangjiagang Haiguo New Energy Equipment
Manufacturing Co., Ltd., Dashiqiao Petrochemical Machinery Forge (general
Partnership), China Sinopec Engineering Incorporation, Wuxi Hongda Heavy Forging
Products Co., Ltd., Shanghai Boiler Works Co., Ltd., Dongfang Boiler Group Co., Ltd.
This Standard specifies terms and definitions, order content, technical requirements,
test methods, inspection rules and markings and quality certificates of carbon and alloy
steel forgings for pressure equipment.
GB/T 223 Methods for chemical analysis of iron, steel and alloy (applicable parts)
GB/T 228.2 Metallic materials - Tensile testing - Part 2. Method of test at elevated
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents -
Spark discharge atomic emission spectrometric method (routine method)
GB/T 8650 Evaluation of pipeline and pressure vessel steels for resistance to
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content -
GB/T 20124 Steel and iron - Determination of nitrogen content - Thermal
conductimetric method after fusion in a current of inert gas (routine method)
NB/T 47013.3 Nondestructive testing of pressure equipment - Part 3. Ultrasonic
NB/T 47013.4 Nondestructive testing of pressure equipment - Part 4. Magnetic
NB/T 47013.5 Nondestructive testing of pressure equipment - Part 5. Penetrant
Axisymmetric hollow forging with an axial length L greater than its outer diameter D,
as shown in Figure 1 a). t is the nominal thickness.
Axisymmetric hollow forging with an axial length L less than or equal to its outer
diameter D, as shown in Figure 1 b). The smaller one of L and t is the nominal thickness.
Axisymmetric solid forging with an axial length L less than or equal to its outer diameter
D, as shown in Figure 1 c). L is the nominal thickness.
5.1 Smelting method
Forging steel shall be killed steel smelted using electric furnace or oxygen converter
and subjected to secondary refining. Agreed upon between the supply and demand
parties, electroslag remelting and other smelting methods can be used.
5.2.1 Smelting analysis
5.2.1.1 Forge steel designation and chemical composition (smelting analysis) shall
comply with the provisions of Table 1.
5.2.1.2 Designation and chemical composition of steel for forgings of supporting valves
and special components is shown in Annex A.
5.2.1.3 As required by the demand party, and indicated in the contract in Table 1, the
P, S content of 35 steel in Table 1 can be P ≤ 0.025 %, S ≤ 0.015 %.
5.2.2 Finished product analysis
5.2.2.1 The demand party may carry out the finished product analysis, and the analysis
result and the allowable deviation of the specified value in Table 1 shall comply with
5.2.2.2 For designations with P ≤ 0.020 % in Table, the allowable positive deviation of
phosphorus content is 0.003 % in finished product analysis; for designations with S ≤
0.010 %, the allowable positive deviation of sulfur content is 0.002 % in finished
5.12 Repair by welding
5.12.1 Steel forgings are not allowed to be repaired by welding without the consent of
the demand party.
5.12.2 As agreed by the demand party, the repair by welding of steel forgings shall
comply with the provisions of relevant regulations and standards. The position, depth,
area of repair by welding, welding material, welding technology, welder qualification
requirements, nondestructive testing methods and qualification grades before and
after repair by welding shall be agreed upon between the supply and demand parties.
5.12.3 The supply party shall provide the demand party with the schematic diagram of
the position, depth and area of repair by welding, and information......
Related standard: NB/T 47009-2017 NB/T 47010-2017