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NBT47008-2010

Chinese Standard: 'NBT47008-2010'
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ICS 77.140.85
J 32 NB
PROFESSIONAL STANDARD OF
THE PEOPLE'S REPUBLIC OF CHINA
NB/T 47008-2010 (JB/T 4726)
Replace JB 4726-2000
Carbon and Alloy Steel Forgings for
Pressure Equipments
Issued on August 27, 2010 Implemented on December 15, 2010
Issued by the National Energy Administration
Contents
Foreword ... II
1 Scope ... . ... 1
2 Normative References ... 1
3 Terms and Definitions ... 2
4 Ordering Information ... 2
5 Technical Requirements ... 3
6 Test Methods . . . . . . . . . . . . . . . . . . . . . ... 9
7 Inspection Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 1 0
8 Marking and Quality Certificate ... ... ... ... ... ... ... ... ... ... .. ... 12
Appendix A (Normative) Additional Requirements ... ... 13
Foreword
There have been some significant changes in this standard over JB 4726-2000.
--Design pressure in application scope has been improved to less than lOOMPa from
not larger than 35MPa;
--Add five steel grades, namely 20MnNiMo, 15NiCuMoNb, 12Cr2MolV,
12Cr3MolV and 10Cr9MolVNb;
--Degrade phosphorus and sulfur contents of a majority of steel grades;
--Add tensile property index of nominal thickness less than or equal to lOOmm for
20Mn and 16Mn steel grades offorgings;
--Improve strength index of 15CrMo and 12CriMoV steel forgings;
--Improve impact power index of all the steel forgings;
--Describe clearly that the Grade I forgings are only applicable to 20, 35 and 16Mn
steel grades of nominal thickness less than or equal to lOOmm.
The Appendix A in this standard is normative.
This standard is proposed by and under the jurisdiction of the National Technical
Committee on Boilers and Pressure Vessels of Standardization Administration of China
(SAC/TC 262).
Drafting organizations of this standard. Hefei General Machinery Research Institute,
China National General Machinery Engineering Corporation, China Special Equipment
Inspection and Research Institute, China First Heavy Industries, Anhui Bureau of Quality and
Technical Supervision, Shanghai Power Equipment Research Institute, Wuxi flange forging
Co,. Ltd and Jiangyin Fangyuan Ringlike Forging& Flange Co., Ltd
Drafting staffs of this standard. Zhang Xiaohu, Qin Xiaozhong, Zhang Yong, Yang
Guoyi, Zhang Wenhui, Zhang Rui, Teng Mingde, Ye Jianping, Chen Zhiwei and Zhao
Yuanzhong.
National Technical Committee on Boilers and Pressure Vessels of Standardization
Administration of China (SAC/TC 262) is in the charge of the explanation of this standard.
This part replaces the following editions in turn.
--JB 4726-1994;
-JB 4726-2000.
PROFESSIONAL STANDARD
OF THE PEOPLE'S REPUBLIC OF CHINA
NBff 47008-2010 (JBff 4726)
Carbon and Alloy Steel F orgings for Pressure Equipments
1 Scope
This standard specifies the technical requirements, test methods and inspection rules, etc.
for carbon steel and alloy steel forgings for pressure equipments.
This standard is applicable to carbon steel and alloy steel forgings for pressure
equipments with a design temperature not less than -20'C and design pressure below lOOMpa.
2 Normative References
The following documents contain provisions which, through reference in this text,
constitute provisions of this standard. For dated references, only the dated versions apply to
this standard. For undated references, the latest edition of the normative document (include all
the amendments) is applicable to this standard.
GB/T 222-2006 Permissible Tolerances for Chemical Composition of Steel Products
GRIT 223 Methods for Chemical Analysis of Iron, Steel and Alloy
GB/T 228 Metallic Materials-Tensile Testing at Ambient Temperature (ISO 6892.1998
(E))
GBIT/229-2007Metallic materials-Charpy pendulum impact test method (ISO
148-1.2006)
GB/T 23 1.1 Metallic Materials-Vickers Hardness Test-Part 1. Test Method (1SO
6506-1 .2005)
GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission Spectrometric
Analysis of Carbon and Low-Alloy Steel (Routine Method)
GB/T 4338 Metallic Materials-Tensile Testing at Elevated Temperature (ISO 783. 1999)
GB/f 6394 Metal-methods for Estimating the Average Grain Size (ASTM E 112. 1996)
GB/T 10561 Steel-Determination of Content of Nonmetallic Inclusions-Micrographic
Method Using Standards Diagrams (1SO 4967. 1998)
GB/T 20066 Steel and Iron-Sampling and Preparation of Samples for the Determination
of Chemical Composition (ISO 14284.1996) ......
Related standard:   NB/T 47008-2017  NB/T 47009-2017
   
 
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