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JB/T 6402-2018

Chinese Standard: 'JB/T 6402-2018'
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JB/T 6402-2018
MECHANICAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.80
J 31
Filing number: 61736-2018
Replacing JB/T 6402-2006
Heavy low alloy steel castings -
Technical specification
大型低合金钢铸件 技术条件
ISSUED ON: FEBRUARY 09, 2018
IMPLEMENTED ON: OCTOBER 01, 2018
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 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 ... 14 
Foreword
This 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);
Heavy low alloy steel castings -
Technical specification
1 Scope
This 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 references
The 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 Hea......
Related standard:   JB/T 6405-2018  JB/T 6403-2017
   
 
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