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NB/T 47010-2010 English PDF (NBT47010-2010)

NB/T 47010-2010 English PDF (NBT47010-2010)

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NB/T 47010-2010: Stainless and heat-resisting steel forgings for pressure equipment

This Standard specifies the technical requirements, test methods and inspection rules of stainless and heat-resisting steel forgings for the pressure equipment.
NB/T 47010-2010
ICS 77.140.85
J 32
INDUSTRY STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
NB/T 47010-2010 (JB/T 4728)
Replacing JB 4728-2000
Stainless and Heat-Resisting Steel Forgings for
Pressure Equipment
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 and 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) Piece-by-piece inspection Ultrasonic testing Piece-by-piece inspection 5.5 Heat treatment
Forgings shall be delivered at the heat treatment state specified in Table 3. If the 6 Test Methods
6.1 Chemical analysis
Chemical analysis shall be in accordance with GB/T 223 or GB/T 11170. Arbitration test shall be in accordance with GB/T 223.
6.2 Hardness test
Hardness test shall be in accordance with GB/T 231.1. Other determination methods may also be used as required.
6.3 Tensile test
Tensile test shall be in accordance with GB/T 228.
6.4 Ultrasonic testing
Ultrasonic testing shall be in accordance with JB/T 4730.3.
7 Inspection Rules
7.1 Forgings shall be inspected by the Supplier's inspection department according to the order contract.
7.2 Specimen for chemical analysis shall be prepared according to GB/T 20066. One specimen shall be taken from each s...

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