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JB/T 6402-2018: Heavy low alloy steel castings - Technical specification Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid JB/T 6402: Historical versions
JB/T 6402-2018: Heavy low alloy steel castings - Technical specification---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JBT6402-2018MECHANICAL INDUSTRY STANDARD ICS 77.140.80 J 31 Filing number. 61736-2018 Replacing JB/T 6402-2006 Heavy low alloy steel castings - Technical specification Issued on. FEBRUARY 09, 2018 Implemented on. OCTOBER 01, 2018 Issued by. Ministry of Industry and Information Technology of PRC Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Order requirements... 6 4 Manufacturing process... 6 4.1 Smelting... 6 4.2 Casting... 6 4.3 Heat treatment... 6 4.4 Repair welding... 6 4.5 Correction... 7 5 Technical requirements... 7 5.1 Chemical composition... 7 5.2 Mechanical properties... 10 5.3 Nondestructive testing... 11 5.4 Surface quality of casting... 12 5.5 Shape and dimensional tolerances... 12 6 Inspection rules and test methods... 12 6.1 Analysis of chemical composition... 12 6.2 Mechanical property test... 12 6.3 Nondestructive testing... 13 6.4 Surface roughness... 13 6.5 Retesting... 13 6.6 Reheat treatment... 14 7 Certificate of quality... 14 8 Marking and packaging... 14ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces JB/T 6402-2006 "Heavy low alloy steel castings". As compared with JB/T 6402-2006, the main technical changes are as follows. - MODIFY the order requirements (see Chapter 3; Chapter 3 of the 2006 edition); - MODIFY the melting method of steel for casting (see 4.1; 4.1.1 of 2006 edition); - MODIFY the provision for repair welding (see 4.4.1; 4.1.4 of 2006 edition); - ADD the definition of major defects (see 4.4.2); - ADD the material designations ZG25Mn, ZG20CrMoV, ZG15Cr1Mo1V (see Tables 1 and 2); - MODIFY the chemical composition of ZG20Mn and ZG35Mn (see Table 1; Table 1 of 2006 edition); - MODIFY the mechanical performance symbols; MODIFY some of the mechanical performance indicators of ZG20Mn, ZG30Mn, ZG35Mn, ZG40Mn, ZG40Mn2, ZG35Cr1Mo and ZG42Cr1Mo (see Table 2; Table 2 of the 2006 edition); - ADD the hardness requirements for ZG65Mn and ZG55CrMnMo (see Table 2; Table 2 of the 2006 edition); - ADD the requirements for non-destructive testing (see 5.3, 6.3); - MODIFY the requirements for the surface quality of castings (see 5.4.2; 4.4.2 of the 2006 edition); - MODIFY the requirements for chemical composition analysis; ADD the requirements for spectral analysis methods and arbitration analysis (see 6.1; 5.1 of the 2006 edition); - MODIFY the rules of the impact test, to change that “the single value of the impact absorption energy shall be not less than 2/3 of the specified value to "70%" (see 6.2.4; 5.2.4 of the 2006 edition); - MODIFY the requirements for the evaluation of surface roughness (see 6.4; 5.4 of the 2006 edition); - MODIFY the requirements for retesting and reheating treatment (see 6.5, 6.6; 5.3 of the 2006 edition); - MODIFY the content of the quality certificate (see Chapter 7; Chapter 6 of the 2006 edition). This standard was proposed by China Machinery Industry Federation. This standard shall be under the jurisdiction of the National Large-scale Casting and Forging Standardization Technical Committee (SAC/TC 506). Drafting organizations of this standard. Erzhong Group (Deyang) Heavy Equipment Co., Ltd., CITIC Heavy Industry Machinery Co., Ltd., Harbin Large Electric Machinery Research Institute, Taiyuan Heavy Industry Co., Ltd. The main drafters of this standard. Liu Xianyou, Xiao Zhangyu, Li Bin, Zhao Yongrang, Xu Enxian, Hou Shipu, Wei Xinhong. This standard replaces the standards previously issued as follows. - JB/T 6402-1992, JB/T 6402-2006. Heavy low alloy steel castings - Technical specification1 ScopeThis standard specifies the order requirements, manufacturing processes, technical requirements, inspection rules and test methods, quality certificates, markings and packaging for general heavy low-alloy steel castings (hereinafter referred to as castings). This standard applies to castings as casted in sand molds or molds with similar thermal conductivity to sand molds.2 Normative referencesThe following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard. GB/T 222 Permissible tolerances for chemical composition of steel products GB/T 223 (All parts) Methods for chemical analysis of steel and alloys GB/T 228.1 Metallic materials - Tensile testing - Part 1.Method of test at room 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 11352 Carbon steel castings for general engineering purpose GB/T 15056 Casting surface roughness - Appraising method GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition JB/T 5000.6 Heavy mechanical general techniques and standards - Part 6. Steel castings JB/T 5000.7 Heavy mechanical general techniques and standards - Part 7. Repair welding for steel castings JB/T 6397-2006 Specification for the heavy carbon structural steel forgings3 Order requirements3.1 The purchaser shall specify the name of the casting, material designations, technical requirements, inspection items, delivery status and quantity of supply in the order contract.4 Manufacturing process4.1 Smelting Steel for castings shall be smelted by induction furnace, electric arc furnace, electric furnace and refined outside the furnace or adopt other melting methods that meet the requirements confirmed by both the supplier and the purchaser. 4.3 Heat treatment Castings shall be heat treated. Unless otherwise specified, the supplier may perform heat treatment according to the requirements of mechanical properties. 4.4 Repair welding 4.4.1 When the purchaser permits repair welding of casting defects, the supplier may repair of casting defects. Unless otherwise specified, repair welding shall be performed in accordance with the provisions of JB/T 5000.7.The process of repair welding shall be determined by the supplier. 4.5 Correction Deformation caused by castings can be eliminated by corrective methods. Correction is usually performed at room temperature. It may use thermal correction in special cases.5 Technical requirements5.1 Chemical composition 5.1.1 The smelting chemical composition of steel shall meet the requirements of Table 1. 5.4 Surface quality of casting 5.4.1 The surface roughness of castings shall meet the requirements of drawings or order agreements. In general, the surface roughness Rα shall be less than or equal to 100 pm. 5.5 Shape and dimensional tolerances The dimensional tolerances and machining allowances of castings shall comply with the provisions of drawings or order agreements. If there are no requirements in the drawings or order agreements, the machining allowances and dimensional tolerances of castings shall comply with the provisions of JB/T 5000.6.6 Inspection rules and test methods6.1 Analysis of chemical composition 6.1.1 When there is no special agreement between the supplier and the purchaser, samples for chemical composition analysis of the casting shall be taken from the ladle during the pouring process or before tapping; one sample shall be taken from each ladle. 6.1.2 Sampling and sample preparation for chemical composition analysis shall be performed in accordance with the provisions of GB/T 20066. 6.2 Mechanical property test 6.2.1 The test blocks for mechanical property tests are in accordance with GB/T 11352.When there is no special agreement between the supplier and the purchaser, the use of individual or auxiliary test blocks shall be determined by the supplier. 6.2.4 For the impact test, the arithmetic mean of the test results of a group of 3 impact specimens shall reach the specified value, of which only one specimen is allowed to have a test result lower than the specified value, but shall not be lower than 70% of the specified value. 6.4 Surface roughness 6.4.1 The assessment of surface roughness shall be carried out in accordance with GB/T 15056. 6.4.2 The surface of the casting shall be visually inspected. 6.5 Retesting 6.6 Reheat treatment When the retest results still do not meet the requirements in Table 2, the castings and test blocks may be heat treated again, but the reheat treatment shall not be more than 2 times (the number of tempering is unlimited). After reheating, the test shall be repeated as specified in 6.2 and 6.3.7 Certificate of qualityUpon delivery, the supplier shall provide the quality certificate to the purchaser. The quality certificate shall include the following.8 Marking and packaging8.1 Castings shall be identified by supplier identification, order contract number, furnace number, production batch number, part number, etc. JB/T 6402-2018 MECHANICAL INDUSTRY STANDARD ICS 77.140.80 J 31 Filing number. 61736-2018 Replacing JB/T 6402-2006 Heavy low alloy steel castings - Technical specification Issued on. FEBRUARY 09, 2018 Implemented on. OCTOBER 01, 2018 Issued by. Ministry of Industry and Information Technology of PRCTable of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Order requirements... 6 4 Manufacturing process... 6 4.1 Smelting... 6 4.2 Casting... 6 4.3 Heat treatment... 6 4.4 Repair welding... 6 4.5 Correction... 7 5 Technical requirements... 7 5.1 Chemical composition... 7 5.2 Mechanical properties... 10 5.3 Nondestructive testing... 11 5.4 Surface quality of casting... 12 5.5 Shape and dimensional tolerances... 12 6 Inspection rules and test methods... 12 6.1 Analysis of chemical composition... 12 6.2 Mechanical property test... 12 6.3 Nondestructive testing... 13 6.4 Surface roughness... 13 6.5 Retesting... 13 6.6 Reheat treatment... 14 7 Certificate of quality... 14 8 Marking and packaging... 14ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces JB/T 6402-2006 "Heavy low alloy steel castings". As compared with JB/T 6402-2006, the main technical changes are as follows. - MODIFY the order requirements (see Chapter 3; Chapter 3 of the 2006 edition); - MODIFY the melting method of steel for casting (see 4.1; 4.1.1 of 2006 edition); - MODIFY the provision for repair welding (see 4.4.1; 4.1.4 of 2006 edition); - ADD the definition of major defects (see 4.4.2); - ADD the material designations ZG25Mn, ZG20CrMoV, ZG15Cr1Mo1V (see Tables 1 and 2); - MODIFY the chemical composition of ZG20Mn and ZG35Mn (see Table 1; Table 1 of 2006 edition); - MODIFY the mechanical performance symbols; MODIFY some of the mechanical performance indicators of ZG20Mn, ZG30Mn, ZG35Mn, ZG40Mn, ZG40Mn2, ZG35Cr1Mo and ZG42Cr1Mo (see Table 2; Table 2 of the 2006 edition); - ADD the hardness requirements for ZG65Mn and ZG55CrMnMo (see Table 2; Table 2 of the 2006 edition); - ADD the requirements for non-destructive testing (see 5.3, 6.3); - MODIFY the requirements for the surface quality of castings (see 5.4.2; 4.4.2 of the 2006 edition); - MODIFY the requirements for chemical composition analysis; ADD the requirements for spectral analysis methods and arbitration analysis (see 6.1; 5.1 of the 2006 edition); - MODIFY the rules of the impact test, to change that “the single value of the impact absorption energy shall be not less than 2/3 of the specified value to "70%" (see 6.2.4; 5.2.4 of the 2006 edition); - MODIFY the requirements for the evaluation of surface roughness (see 6.4; 5.4 of the 2006 edition); - MODIFY the requirements for retesting and reheating treatment (see 6.5, 6.6; 5.3 of the 2006 edition); - MODIFY the content of the quality certificate (see Chapter 7; Chapter 6 of the 2006 edition). This standard was proposed by China Machinery Industry Federation. This standard shall be under the jurisdiction of the National Large-scale Casting and Forging Standardization Technical Committee (SAC/TC 506). Drafting organizations of this standard. Erzhong Group (Deyang) Heavy Equipment Co., Ltd., CITIC Heavy Industry Machinery Co., Ltd., Harbin Large Electric Machinery Research Institute, Taiyuan Heavy Industry Co., Ltd. The main drafters of this standard. Liu Xianyou, Xiao Zhangyu, Li Bin, Zhao Yongrang, Xu Enxian, Hou Shipu, Wei Xinhong. This standard replaces the standards previously issued as follows. - JB/T 6402-1992, JB/T 6402-2006. Heavy low alloy steel castings - Technical specification1 ScopeThis standard specifies the order requirements, manufacturing processes, technical requirements, inspection rules and test methods, quality certificates, markings and packaging for general heavy low-alloy steel castings (hereinafter referred to as castings). This standard applies to castings as casted in sand molds or molds with similar thermal conductivity to sand molds.2 Normative referencesThe following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard. GB/T 222 Permissible tolerances for chemical composition of steel products GB/T 223 (All parts) Methods for chemical analysis of steel and alloys GB/T 228.1 Metallic materials - Tensile testing - Part 1.Method of test at room 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 11352 Carbon steel castings for general engineering purpose GB/T 15056 Casting surface roughness - Appraising method GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition JB/T 5000.6 Heavy mechanical general techniques and standards - Part 6. Steel castings JB/T 5000.7 Heavy mechanical general techniques and standards - Part 7. Repair welding for steel castings JB/T 6397-2006 Specification for the heavy carbon structural steel forgings3 Order requirements3.1 The purchaser shall specify the name of the casting, material designations, technical requirements, inspection items, delivery status and quantity of supply in the order contract.4 Manufacturing process4.1 Smelting Steel for castings shall be smelted by induction furnace, electric arc furnace, electric furnace and refined outside the furnace or adopt other melting methods that meet the requirements confirmed by both the supplier and the purchaser. 4.3 Heat treatment Castings shall be heat treated. Unless otherwise specified, the supplier may perform heat treatment according to the requirements of mechanical properties. 4.4 Repair welding 4.4.1 When the purchaser permits repair welding of casting defects, the supplier may repair of casting defects. Unless otherwise specified, repair welding shall be performed in accordance with the provisions of JB/T 5000.7.The process of repair welding shall be determined by the supplier. 4.5 Correction Deformation caused by castings can be eliminated by corrective methods. Correction is usually performed at room temperature. It may use thermal correction in special cases.5 Technical requirements5.1 Chemical composition 5.1.1 The smelting chemical composition of steel shall meet the requirements of Table 1. 5.4 Surface quality of casting 5.4.1 The surface roughness of castings shall meet the requirements of drawings or order agreements. In general, the surface roughness Rα shall be less than or equal to 100 pm. 5.5 Shape and dimensional tolerances The dimensional tolerances and machining allowances of castings shall comply with the provisions of drawings or order agreements. If there are no requirements in the drawings or order agreements, the machining allowances and dimensional tolerances of castings shall comply with the provisions of JB/T 5000.6.6 Inspection rules and test methods6.1 Analysis of chemical composition 6.1.1 When there is no special agreement between the supplier and the purchaser, samples for chemical composition analysis of the casting shall be taken from the ladle during the pouring process or before tapping; one sample shall be taken from each ladle. 6.1.2 Sampling and sample preparation for chemical composition analysis shall be performed in accordance with the provisions of GB/T 20066. 6.2 Mechanical property test 6.2.1 The test blocks for mechanical property tests are in accordance with GB/T 11352.When there is no special agreement between the supplier and the purchaser, the use of individual or auxiliary test blocks shall be determined by the supplier. 6.2.4 For the impact test, the arithmetic mean of the test results of a group of 3 impact specimens shall reach the specified value, of which only one specimen is allowed to have a test result lower than the specified value, but shall not be lower than 70% of the specified value. 6.4 Surface roughness 6.4.1 The assessment of surface roughness shall be carried out in accordance with GB/T 15056. 6.4.2 The surface of the casting shall be visually inspected. 6.5 Retesting 6.6 Reheat treatment When the retest results still do not meet the requirements in Table 2, the castings and test blocks may be heat treated again, but the reheat treatment shall not be more than 2 times (the number of tempering is unlimited). After reheating, the test shall be repeated as specified in 6.2 and 6.3.7 Certificate of qualityUpon delivery, the supplier shall provide the quality certificate to the purchaser. The quality certificate shall include the following.8 Marking and packaging8.1 Castings shall be identified by supplier identification, order contract number, furnace number, production batch number, part number, etc. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of JB/T 6402-2018 be delivered?Answer: The full copy PDF of English version of JB/T 6402-2018 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of JB/T 6402-2018_English with my colleagues?Answer: Yes. 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