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NB/T 47010-2010

Chinese Standard: 'NB/T 47010-2010'
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Detail Information of NB/T 47010-2010; NB/T47010-2010
Description (Translated English): Stainless and heat-resisting steel forgings for pressure equipment
Sector / Industry: Energy Industry Standard (Recommended)
Classification of Chinese Standard: J32
Classification of International Standard: 77.140.85
Word Count Estimation: 13,178
Date of Issue: 2010-08-27
Date of Implementation: 2011-12-15
Older Standard (superseded by this standard): JB 4728-2000
Quoted Standard: GB/T 222-2006; GB/T 223; GB/T 228; GB/T 231.1; GB/T 6394; GB/T 10561; GB/T 11170; GB/T 20066; JB/T 4730.3
Drafting Organization: Hefei General Machinery Research Institute
Administrative Organization: National Standardization Technical Committee Boiler and Pressure Vessel
Regulation (derived from): ?National Energy Board Announcement 2010 No.3
Summary: This standard specifies the pressure equipment with stainless and heat-resisting steel forgings technical requirements, test methods and inspection rules. This standard applies to the design pressure of less than 100MPa pressure equipment with stainless steel and heat-resistant steel plating.

NB/T 47010-2010
ICS 77.140.85
J 32
INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
NB/T 47010-2010 (JB/T 4728)
Replacing JB 4728-2000
Stainless and Heat-Resisting Steel Forgings for
Pressure Equipment
承压设备用不锈钢和耐热钢锻件
ISSUED ON. AUGUST 27, 2010
IMPLEMENTED ON. DECEMBER 15, 2011
Issued by. National Energy Administration
NB
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 6
4 Order Contents ... 7
5 Technical Requirements ... 8
6 Test Methods ... 13
7 Inspection Rules ... 13
8 Marking and Quality Certificate ... 15
Annex A (Normative) Additional Requirements ... 17
Annex B (Informative) Steel Grade Comparison Between the New and Old
Standards ... 19
Foreword
Compared with JB 4728-2000, this Standard has the following main changes.
- Design pressure in application scope has been improved from not greater than 35
MPa to less than 100 MPa;
- Steel grade in this Standard adopts unified numerical code; ADD steel grade
comparison between the new and old standards in Annex B (Informative);
- ADD two austenitic stainless steel grades (S31703 and S39042); four austenitic
heat-resisting steel grades (S30409, S34779, S31609 and S31008); two austenitic
- ferritic stainless steel grades (S22253 and S220553);
- REDUCE sulfur contents in a majority of steel grades;
- ENLARGE nominal thickness range of all the steel forgings;
- IMPROVE tensile strength index of steel forging with nominal thickness greater
than 100 mm;
- It is specified that Class I forgings are only applicable to S11306 and S30408 steel
grades with nominal thickness less than or equal to 150 mm.
Annex A of this Standard is normative, and Annex B is informative.
This Standard was 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, Anhui Bureau of Quality and Technical Supervision,
Wuxi Falan Forging Co., Ltd., Shanghai Power Equipment Research Institute, Nanjing
Develop Industry Co., Ltd., Changzhou Sunshine General Petrochemical Fittings Co.,
Ltd.
Drafting staffs of this Standard. Zhang Xiaohu, Qin Xiaozhong, Zhang Yong, Yang
Guoyi, Ai Zhibin, Zhang Rui, Teng Deming, Chen Zhiwei, Yin Lijun, Zhang Li.
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.
The previous editions of the standards replaced by this Standard are.
Stainless and Heat-Resisting Steel Forgings for
Pressure Equipment
1 Scope
This Standard specifies the technical requirements, test methods and inspection rules
of stainless and heat-resisting steel forgings for the pressure equipment’s.
This Standard is applicable to the stainless and heat-resisting steel forgings for
pressure equipment’s with a design pressure less than 100 MPa.
2 Normative References
The following documents are indispensable for the application of this Standard. For
dated references, only the dated edition is applicable to this document. For undated
references, the latest editions of the normative documents (including all the
amendments) are applicable to this document.
GB/T 222-2006 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223 Methods for Chemical Analysis of Iron, Steel and Alloy
GB/T 228 Metallic Materials - Tensile Testing at Ambient Temperature (ISO
6892.1998 (E))
GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1. Test Method (ISO
6506-1.2005)
GB/T 6394 Metal-methods for Estimating the Average Grain Size (ASTM E112.1996)
GB/T 10561 Steel Determination of Content of Nonmetallic Inclusions -
Micrographic Method Using Standards Diagrams (ISO 4967.1998)
GB/T 11170 Stainless Steel - Determination of Multi-Element Contents - Spark
Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 20066 Steel and Iron - Sampling and Preparation of Samples for the
Determination of Chemical Composition (ISO 14284.1996)
JB/T 4730.3 Nondestructive Testing of Pressure Equipment - Part 3. Ultrasonic
Testing
3 Terms and Definitions
For the purposes of this Standard, the following terms and definitions apply.
3.1
Hollow forging
It refers to the axisymmetrical hollow forging, whose axial length L is greater than its
outer diameter D, as shown in Fig. 1 a). t shall be the nominal thickness.
3.2
Ring forging
It refers to the axisymmetrical hollow forging whose axial length L is less than or equal
to its outer diameter D, as shown in Fig. 1 b). The smaller one of L and t shall be the
nominal thickness.
3.3
Disk forging
It refers to the axisymmetrical solid forging, whose axial length L is less than or equal
to its outer diameter D, as shown in Fig. 1 c). L shall be the nominal thickness.
3.4
Bowl forging
It refers to the axisymmetrical forging with concave section, whose height H is less
than or equal to its outer diameter D, as shown in Fig. 1 d). The greater one of t1 and
t2 shall be the nominal thickness.
3.5
Neck flange forging
It refers to the axisymmetrical hollow forging with two axials outside diameters, as
shown in Fig. 1 e). The greater one of t1 and t2 shall be the nominal thickness.
3.6
Bar forging
It refers to the solid forging with circular section, whose axial length L is greater than
its outer diameter D, as shown in Fig. 1 f). D shall be the nominal thickness.
4.2 The Buyer shall provide order drawing.
4.3 When the additional requirements in Annex A (Normative) of this Standard and
other requirements which exceed or are higher than this Standard are used, they shall
be indicated in the order contract by the Buyer.
5 Technical Requirements
5.1 Smelting process
The steel for forging shall be smelted through electric furnace or oxygen converter and
also shall adopt external refining process.
5.2 Chemical Compositions
5.2.1 Chemical compositions (heat analysis) of the steel for forging shall be in
accordance with those specified in Table 1.
5.2.2 The Buyer may carry out product analysis, the allowable deviation between the
analysis results and the specified values in Table 1 shall comply with the requirements
in Table 3 of GB/T 222.
5.3 Forging
5.3.1 Steel ingot, billet steel, rolled metal used for forging shall be accompanied with
the quality certificate of the smelter.
5.3.2 Steel ingots to be used to produce forgings shall have sufficient cut-off quantities
at their tops & bottoms, ensuring no shrinkage cavity, serious segregation and other
defects within the forgings.
5.3.3 Forging ratio of main section of the forging shall not be less than 3 (not less than
2 for electroslag remelting steel) when steel ingot or billet steel is used for forging. And
the forging ratio of main section of the forging shall not be less than 1.6 when rolled
metal is used for forging.
5.3.4 The forging shall be formed through hot working by press, forging hammer or
rolling mills, the metal on the whole section shall be forged thoroughly and should be
close to the shape and dimension of the finished parts as far as possible.
5.4 Forging class
Forgings are divided into four classes of I, II, III and IV. The inspection item of each
class shall follow the requirements in Table 2. Class I forging is only applicable to
S11306 and S30408 steel forgings of nominal thickness less than or equal to 150 mm.
Table 2
Forging class Inspection item Inspection quantity
I Hardness (HBW) Piece-by-piece inspection
II Tension (Rm, Rp0.2, A)
Inspect one forging
randomly from each batch
composed of the forgings of
the same smelting furnace
number and heat treated in
the same furnace III Tension (Rm, Rp0.2, A)
Ultrasonic testing Piece-by-piece inspection
IV Tension (Rm, Rp0.2, A)......
Related standard:   NB/T 47010-2017  NB/T 47008-2017
   
 
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