1 Scope
This standard specifies the technical requirements, inspection rules, test methods, quality certificate and marking of large gear (including gear shaft) and girth gear forgings.
This standard is applicable to order, manufacture and acceptance of large gear (including gear shaft) and girth gear forgings.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding corrections to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.
GB/T 223 Methods for Chemical Analysis of Iron, Steel and Alloy (All Parts)
GB/T 228 Metallic Materials - Tensile Testing at Ambient Temperature (GB/T 228-2002, Eqv ISO 6892: 1998 (E))
GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method (GB/T 229-2007, ISO 148-1: 2006, MOD)
GB/T 230.1 Metallic Materials - Rockwell Hardness Test - Part 1: Test Method (Scales A, B, C, D, E, F, G, H, K, N and T) (GB/T 230.1-2009, ISO 6508-1: 2005, MOD)
GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1: Test Method (GB/T 231.1-2009, ISO 6506-1: 2005, MOD)
GB/T 6394 Metal - Methods for Estimating the Average Grain Size (GB/T 6394-2002, ASTM E 112: 1996, MOD)
JB/T 5000.15-2007 Heavy Mechanical General Techniques and Standards - Part 15: Non-destructive Inspection of Forged Steel
JB/T 6397-2006 Specification for the Heavy Carbon Structural Steel Forgings
3 Order Requirements
3.1 The Demander shall indicate the name, material designation, supply quantity and delivery state of forgings, the corresponding technical requirements and inspection items agreed by the Supplier and the Demander as well as the inspection items beyond this standard in order contract.
Foreword I
1 Scope
2 Normative References
3 Order Requirements
4 Manufacturing Process
4.1 Smelting
4.2 Forging
4.3 Heat Treatment
4.4 Mechanical Processing
4.5 Repair Welding
5 Technical Requirements
5.1 Chemical Composition
5.2 Mechanical Property
5.3 Hardness
5.4 Grain Size
5.5 Non-destructive Testing
6 Inspection Rules and Test Methods
6.1 Chemical Composition Analysis
6.2 Mechanical Property Test
6.3 Grain Size Inspection
6.4 Non-destructive Testing
6.5 Retest
6.6 Re-heat Treatment
7 Acceptance and Quality Certificate
7.1 Acceptance
7.2 Quality Certificate
8 Marking and Packaging
Table 1 Chemical Composition (Mass Fraction)
Table 2 Permissible Deviation of Chemical Composition (Mass Fraction) in Product Analysis
Table 3 Mechanical Property
Table 4 Inspection Items and Sampling Requirements
Table 5 Amount of Reduction in Tangential and Horizontal Mechanical Property Indexes
