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JB/T 5000.8-2007   Heavy Mechanical General Techniques and Standards - Part 8: Forging (English Version)
Standard No.: JB/T 5000.8-2007 Status:valid remind me the status change

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Language:English File Format:PDF
Word Count: 3500 words Price(USD):70.0 remind me the price change

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Implemented on:2008-2-1 Delivery: via email in 1 business day
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Standard No.: JB/T 5000.8-2007
English Name: Heavy Mechanical General Techniques and Standards - Part 8: Forging
Chinese Name: 重型机械通用技术条件 第8部分:锻件
Chinese Classification: H90    Metallurgical machinery in general
Professional Classification: JB    Professional Standard - Machinery
ICS Classification: 25.120.20 25.120.20    Rolling, extruding and drawing equipment 25.120.20
Issued by: NDRC
Issued on: 2007-8-28
Implemented on: 2008-2-1
Status: valid
Superseding:JB/T 5000.8-1998 The heavy mechanical general techniques and STANDARDs Forging
Language: English
File Format: PDF
Word Count: 3500 words
Price(USD): 70.0
Delivery: via email in 1 business day
Heavy Mechanical General Techniques and Standards - Part 8: Forging 1 Scope This part of JB/T 5000 specifies the technical requirements, inspection rules, test methods, quality certificate and marking, etc. of large forgings for general purpose. This part is applicable to the ordering, manufacturing and inspection of large carbon steel and structural alloy forgings forged freely by water (oil) press and forging hammer. 2 Normative References The following normative documents contain provisions which, through reference in this part, constitute provisions of this part. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this part are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document referred to applies. GB/T 223 (All Parts) Methods for Chemical Analysis of Iron, Steel and Alloy GB/T 226 Etch Test for Macrostructure and Defect of Steels (GB/T 226-1991, neq ISO 4949:1980) GB/T 228 Metallic Materials-Tensile Testing at Ambient Temperature [GB/T228-2002, eqv ISO 6892:1998 (E)] GB/T 229 Metallic Materials-Charpy Notch Impact Test (GB/T229-1994, eqv ISO 148:1983) GB/T 231.1 Metallic Materials-Brinell Hardness Test-Part 1: Test Method [GB/T 231.1-2002, eqv ISO 6506-1:1999 (E)] GB/T 1979 Standard Diagrams for Macrostructure and Defect of Structural Steels GB/T 4338 Metallic Materials-Tensile Testing at Elevated Temperature (GB/T 4338-1995, eqv ISO 738:1989) GB/T 6394 Metal-Methods for Estimating the Average Grain Size (GB/T 6394-2002, ASTME112: 1996, MOD) GB/T 10561 Steel-Determination of Content of Non-metallic Inclusion-Micrographic Method Using Standard Diagrams (GB/T 10561-1989, eqv ISO 4967: 1979) JB/T 5000.15 Heavy Mechanical General Techniques and Standards-Part 15: Non-destructive Inspection of Forged Steel 3 Order Requirements 3.1 The demander shall specify the standards adopted, forging groups, steel grades, corresponding technical requirements and inspection items as well as other additional information in the order contract or order agreement. 3.2 The demander shall provide order drawings. 3.3 Supplementary requirements shall be negotiated by both the supplier and demander. 4 Specifications 4.1 Manufacturing Process 4.1.1 Smelting If no special requirement is made by the demander, then the smelting process shall be determined by the supplier. 4.1.2 Forging 4.1.2.1 The upper and lower parts of the ingots shall be provided with sufficient removal in order to make the finished forgings free from shrinkage and severe segregation. 4.1.2.2 Forgings shall be forged and formed on forging press with adequate capacity in order to ensure thorough internal forging. 4.1.2.3 If ingots are adopted for forging, their forging ratio shall be generally no less than 3 for those un-upset and no less than 2.5 for those upset. The forging ratio of flanges shall not be less than 1.7. If advanced forging methods are adopted, their forging ratio may be appropriately reduced. 4.1.2.4 If forge bars or mill bars are adopted for forging, the forging ratio shall be generally not less than 1.5 and that of the flanges not less than 1.3. 4.1.2.5 The forgings, after forging, shall be subjected to heat treatment with a certain method to reduce the forging stress and make forgings be with good machining property. As for those forgings for which the post-forging heat treatment is taken as the final heat treatment, they shall meet the technical requirements of drawing. 4.1.2.6 Forms and dimensions of forgings shall meet the requirements specified in the forging drawing and process documents. 4.1.3 Heat treatment Final heat treatment of the forgings shall be carried out based on the delivery state specified in the order contract or drawing. 4.1.4 Machining Machining of the forging shall be in accordance with the dimensions and surface roughness specified in the order drawing. 4.2 Chemical Compositions Chemical compositions of the steel shall meet the defined standards specified in the order contract or drawing. 4.3 Mechanical Properties Mechanical properties of the forging shall meet those specified in the order contract or drawing. 4.4 Others The demander, when necessary, may put forward non-destructive inspection, elevated temperature strength, low temperature flexibility, grain size, inclusion, metallurgical structure and other supplementary requirements, whose test methods and acceptance standards shall be determined through negotiation by both sides.
Foreword II 1 Scope 2 Normative References 3 Order Requirements 4 Specifications 4.1 Manufacturing process 4.2 Chemical compositions 4.3 Mechanical Properties 4.4 Others 5 Test Rules and Test Methods 5.1 Chemical Composition Analysis 5.2 Mechanical Test 6 Acceptance, Re-inspection and Re-heat Treatment 7 Quality Certificate 8 Printing and Packing Figure 1 Axial or Square and Rectangular Forging Figure 2 Hollow Forging Figure 3 Disc Forging Figure 4 Ring Forging Table 1 Permissible Deviation of Common Straight Carbon Steel and Low-alloy Steel Product Analysis Table 2 Permissible Deviation of Qualitative Carbon Steel and Alloy Structural Steel Product Analysis Table 3 Acceptance and Grouping of Forgings Table 4 Reduction Value of Tangential and Transverse Mechanical Properties
Referred in JB/T 5000.8-2007:
*GBT223-
*GB/T 226-2015 Test method for macrostructure and defect of steel by etching
*GB/T 228-2002 Metallic Materials – Tensile Testing at Ambient Temperature
*GB/T 229-2020 Metallic materials—Charpy pendulum impact test method
*GB/T 231.1-2018 Metallic materials-Brinell hardness test-Part 1:Test method
*GB/T 1979-2001 STANDARD diagrams for macrostructure and defect of structural steels
*GB/T 4338-2006 Metallic materials - Tensile testing at elevated temperature
*GB/T 6394-2017 Metal - Methods for estimating the average grain size
*GB/T 10561-2005 Steel - Determination of Content of Nonmetallic Inclusions - Micrographic Method Using Standards Diagrams
*JB/T 5000.15-2007 Heavy mechanical general techniques and standards-Part 15:Non-destructive inspection of forged steel
JB/T 5000.8-2007 is referred in:
* JB/T 5000.1-2007 Heavy mechanical general techniques and standards-Part 1:Check of product
* GB/T 26079-2010 Beam-type lifting device
*GB/T 14370-2015 Anchorage,grip and coupler for prestressing tendons
*JB/T 12474.10-2015 Coke oven machine-Part 10:Stamping machine
*JB/T 10731-2017 Limestone wet ball mill for desulphurization
*NB/T 47060-2017 The rotary air preheater
*GB/T 10595-2017 Belt conveyors
*HG/T 2268-2009 Technical specifications of steel vessel with mechanical agitating equipment
*JB/T 4149-2010 Specifications for boom stacker reclaimer
Code of China
Standard
JB/T 5000.8-2007  Heavy Mechanical General Techniques and Standards - Part 8: Forging (English Version)
Standard No.JB/T 5000.8-2007
Statusvalid
LanguageEnglish
File FormatPDF
Word Count3500 words
Price(USD)70.0
Implemented on2008-2-1
Deliveryvia email in 1 business day
Detail of JB/T 5000.8-2007
Standard No.
JB/T 5000.8-2007
English Name
Heavy Mechanical General Techniques and Standards - Part 8: Forging
Chinese Name
重型机械通用技术条件 第8部分:锻件
Chinese Classification
H90
Professional Classification
JB
ICS Classification
Issued by
NDRC
Issued on
2007-8-28
Implemented on
2008-2-1
Status
valid
Superseded by
Superseded on
Abolished on
Superseding
JB/T 5000.8-1998 The heavy mechanical general techniques and STANDARDs Forging
Language
English
File Format
PDF
Word Count
3500 words
Price(USD)
70.0
Keywords
JB/T 5000.8-2007, JB 5000.8-2007, JBT 5000.8-2007, JB/T5000.8-2007, JB/T 5000.8, JB/T5000.8, JB5000.8-2007, JB 5000.8, JB5000.8, JBT5000.8-2007, JBT 5000.8, JBT5000.8
Introduction of JB/T 5000.8-2007
Heavy Mechanical General Techniques and Standards - Part 8: Forging 1 Scope This part of JB/T 5000 specifies the technical requirements, inspection rules, test methods, quality certificate and marking, etc. of large forgings for general purpose. This part is applicable to the ordering, manufacturing and inspection of large carbon steel and structural alloy forgings forged freely by water (oil) press and forging hammer. 2 Normative References The following normative documents contain provisions which, through reference in this part, constitute provisions of this part. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this part are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document referred to applies. GB/T 223 (All Parts) Methods for Chemical Analysis of Iron, Steel and Alloy GB/T 226 Etch Test for Macrostructure and Defect of Steels (GB/T 226-1991, neq ISO 4949:1980) GB/T 228 Metallic Materials-Tensile Testing at Ambient Temperature [GB/T228-2002, eqv ISO 6892:1998 (E)] GB/T 229 Metallic Materials-Charpy Notch Impact Test (GB/T229-1994, eqv ISO 148:1983) GB/T 231.1 Metallic Materials-Brinell Hardness Test-Part 1: Test Method [GB/T 231.1-2002, eqv ISO 6506-1:1999 (E)] GB/T 1979 Standard Diagrams for Macrostructure and Defect of Structural Steels GB/T 4338 Metallic Materials-Tensile Testing at Elevated Temperature (GB/T 4338-1995, eqv ISO 738:1989) GB/T 6394 Metal-Methods for Estimating the Average Grain Size (GB/T 6394-2002, ASTME112: 1996, MOD) GB/T 10561 Steel-Determination of Content of Non-metallic Inclusion-Micrographic Method Using Standard Diagrams (GB/T 10561-1989, eqv ISO 4967: 1979) JB/T 5000.15 Heavy Mechanical General Techniques and Standards-Part 15: Non-destructive Inspection of Forged Steel 3 Order Requirements 3.1 The demander shall specify the standards adopted, forging groups, steel grades, corresponding technical requirements and inspection items as well as other additional information in the order contract or order agreement. 3.2 The demander shall provide order drawings. 3.3 Supplementary requirements shall be negotiated by both the supplier and demander. 4 Specifications 4.1 Manufacturing Process 4.1.1 Smelting If no special requirement is made by the demander, then the smelting process shall be determined by the supplier. 4.1.2 Forging 4.1.2.1 The upper and lower parts of the ingots shall be provided with sufficient removal in order to make the finished forgings free from shrinkage and severe segregation. 4.1.2.2 Forgings shall be forged and formed on forging press with adequate capacity in order to ensure thorough internal forging. 4.1.2.3 If ingots are adopted for forging, their forging ratio shall be generally no less than 3 for those un-upset and no less than 2.5 for those upset. The forging ratio of flanges shall not be less than 1.7. If advanced forging methods are adopted, their forging ratio may be appropriately reduced. 4.1.2.4 If forge bars or mill bars are adopted for forging, the forging ratio shall be generally not less than 1.5 and that of the flanges not less than 1.3. 4.1.2.5 The forgings, after forging, shall be subjected to heat treatment with a certain method to reduce the forging stress and make forgings be with good machining property. As for those forgings for which the post-forging heat treatment is taken as the final heat treatment, they shall meet the technical requirements of drawing. 4.1.2.6 Forms and dimensions of forgings shall meet the requirements specified in the forging drawing and process documents. 4.1.3 Heat treatment Final heat treatment of the forgings shall be carried out based on the delivery state specified in the order contract or drawing. 4.1.4 Machining Machining of the forging shall be in accordance with the dimensions and surface roughness specified in the order drawing. 4.2 Chemical Compositions Chemical compositions of the steel shall meet the defined standards specified in the order contract or drawing. 4.3 Mechanical Properties Mechanical properties of the forging shall meet those specified in the order contract or drawing. 4.4 Others The demander, when necessary, may put forward non-destructive inspection, elevated temperature strength, low temperature flexibility, grain size, inclusion, metallurgical structure and other supplementary requirements, whose test methods and acceptance standards shall be determined through negotiation by both sides.
Contents of JB/T 5000.8-2007
Foreword II 1 Scope 2 Normative References 3 Order Requirements 4 Specifications 4.1 Manufacturing process 4.2 Chemical compositions 4.3 Mechanical Properties 4.4 Others 5 Test Rules and Test Methods 5.1 Chemical Composition Analysis 5.2 Mechanical Test 6 Acceptance, Re-inspection and Re-heat Treatment 7 Quality Certificate 8 Printing and Packing Figure 1 Axial or Square and Rectangular Forging Figure 2 Hollow Forging Figure 3 Disc Forging Figure 4 Ring Forging Table 1 Permissible Deviation of Common Straight Carbon Steel and Low-alloy Steel Product Analysis Table 2 Permissible Deviation of Qualitative Carbon Steel and Alloy Structural Steel Product Analysis Table 3 Acceptance and Grouping of Forgings Table 4 Reduction Value of Tangential and Transverse Mechanical Properties
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