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NB/T 47008-2017 PDF English


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NB/T 47008-2017: PDF in English (NBT 47008-2017)

NB/T 47008-2017 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.85 J 32 Replacing NB/T 47008-2010, JB/T 9626-1999 Carbon and alloy steel forgings for pressure equipment ISSUED ON. MARCH 28, 2017 IMPLEMENTED ON. AUGUST 01, 2017 Issued by. National Energy Administration 3. No action is required - Full-copy of this standard will be automatically & immediately delivered to your EMAIL address in 0~60 minutes. Table of Contents Foreword ... 3 1 Scope ... 5 2 Normative references ... 5 3 Terms and definitions ... 6 4 Order content ... 8 5 Technical requirements ... 9 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 Foreword 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 as follows. - 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). Drafting organizations of this Standard. Hefei General Machinery Research Institute, 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. Carbon and alloy steel forgings for pressure equipment 1 Scope 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. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the dated edition cited applies. For undated references, the latest edition of the referenced document (including all amendments) applies. GB/T 222 Permissible tolerances for chemical composition of steel products GB/T 223 Methods for chemical analysis of iron, steel and alloy (applicable parts) GB/T 226 Test method for macrostructure and defect of steel by etching GB/T 228.1 Metallic materials - Tensile testing - Part 1. Method of test at room temperature GB/T 228.2 Metallic materials - Tensile testing - Part 2. Method of test at elevated temperature GB/T 229 Metallic materials - Charpy pendulum impact test method GB/T 231.1 Metallic materials - Brinell hardness test - Part 1. 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 6394 Metal - Methods for estimating the average grain size GB/T 8650 Evaluation of pipeline and pressure vessel steels for resistance to hydrogen-induced cracking GB/T 10561 Steel - Determination of content of nonmetallic inclusions - Micrographic method using standards diagrams GB/T 13298 Inspection methods of microstructure for metals GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition GB/T 20123 Steel and iron - Determination of total carbon and sulfur content - Infrared absorption method after combustion in an induction furnace (routine method) 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 testing NB/T 47013.4 Nondestructive testing of pressure equipment - Part 4. Magnetic particle testing NB/T 47013.5 Nondestructive testing of pressure equipment - Part 5. Penetrant testing 3 Terms and definitions 3.1 hollow forging 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. 3.2 ring forging 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. 3.3 disk forging 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. 3.4 bowl forging 5 Technical requirements 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 Chemical composition 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 the provisions of GB/T 222. 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 product analysis. 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 such as the welding material, the welding technology parameters and the nondestructive testing report. 5.13 Additional requirements As required by the demand party, agreed upon between the supply and demand parties, and indicated in the contract, it may add other inspection items of Annex B. 6 Test methods 6.1 Chemical analysis The chemical analysis shall comply with the provisions of GB/T 223, GB/T 4336, GB/T 20123, GB/T 20124. The arbitration test shall comply with the provisions of GB/T 223. 6.2 Tensile test The room temperature tensile test shall comply with the provisions of GB/T 228.1, and the high temperature tensile test shall comply with the provisions of GB/T 228.2. 6.3 Impact test The impact test shall comply with the provisions of GB/T 229. 6.4 Hardness test The hardness test is carried out according to GB/T 231.1. 6.5 Low magnification test... ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.