Construction machinery - General specification for spheroidal graphite cast iron
1 Scope
This standard specifies the terms and definitions, requirements, test methods, inspection rules, marking, packaging, transportation and storage of spheroidal graphite cast iron for construction machinery.
This standard is applicable to the ordinary and low alloy spheroidal graphite cast iron (hereinafter referred to as “casting”) cast in sand molds or molds with thermal conductivity equivalent to sand molds.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1348-2009 Spheroidal graphite iron castings
GB/T 2829 Sampling procedures and tables for periodic inspection by attributes (Apply to inspection of process stability)
GB 5611 Foundry terminology
GB/T 6414-2017 Castings - Dimensional tolerances and geometrical tolerances and machining allowances
GB/T 9441 Metallographic test method for spheroidal graphite cast iron
GB/T 11351 Mass tolerances of casting
JB/T 5000.4 Heavy mechanical general techniques and standards - Part 4: Iron casting
JB/T 5947 Construction machinery - General specifications for packing
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 1348-2009 and GB/T 5611 apply.
4 Requirements
4.1 Grade
The grade of the casting shall meet the requirements of GB/T 1348.
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4.2 Mechanical property
The mechanical property of the casting shall meet the requirements of 7.1 ~ 7.4 in GB/T 1348-2009.
4.3 Chemical composition
The chemical composition of the casting shall be determined by the manufacturer or by negotiation between the purchaser and the supplier.
4.4 Metallographic microstructure
Where there are special requirements for metallographic microstructure of the casting, it shall be indicated in the drawing or relevant technical documents, and shall meet the requirements of GB/T 9441.
4.5 Geometric shapes and dimensions
The geometric shapes and dimensions of the casting shall meet the requirements of user product drawings and technical documents.
4.6 Dimensional tolerance
4.6.1 Dimensional tolerance class
The class of tolerance of the casting shall be selected according to Table 1 of this standard, and the dimensional tolerance shall meet those specified in Table 1 of GB/T 6414-2017.
Table 1 Dimensional tolerance class
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
4.1 Grade
4.2 Mechanical property
4.3 Chemical composition
4.4 Metallographic microstructure
4.5 Geometric shapes and dimensions
4.6 Dimensional tolerance
4.7 Machining allowance
4.8 Tolerance of geometrical shape
4.9 Mass deviation
4.10 Pattern draft
4.11 Surface quality
4.12 Defect repair
4.13 Heat treatment
4.14 Other requirements
5 Test methods
6 Test rules
6.1 General requirements
6.2 Tensile test
6.3 Hardness test
6.4 Chemical analysis
6.5 Metallographic microstructure
6.6 Geometric shapes and dimensions
6.7 Mass deviation
6.8 Surface quality and defect repair quality
7 Marking, packaging, transportation and storage
7.1 Marking
7.2 Packaging
7.3 Transportation
7.4 Storage
Annex A (Informative) Casting machining allowance
Annex B (Informative) Dimension range of non-cast holes
Annex C (Informative) Casting mass tolerance
Annex D (Informative) Pattern draft of castings
D.1 Pattern draft
D.2 Types and applications of pattern draft
Figure 1 Mismatch
Table 1 Dimensional tolerance class
Table 2 Mismatch value
Table 3 Deformation of bending and warping
Table A.1 Rank of machining allowances
Table A.2 Machining allowance for castings used in conjunction with the dimensional tolerance
Table B.1 Dimension range of non-cast holes
Table C.1 Mass tolerance for castings
Table C.2 Class of mass tolerances of castings
Table D.1 Pattern draft of castings
Table D.2 Types and application of pattern draft for castings
