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JB/T 5938-2018Construction machinery - General specification for spheroidal graphite cast iron (English PDF)

工程机械球墨铸铁件通用技术条件

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Issued by

MIIT

Level / Type

Industry · Recommended

Issue date

February 9, 2018

Implementation date

October 1, 2018

Scope

JB/T 5938-2018 is the English-translated version of 工程机械球墨铸铁件通用技术条件.

JB/T 5938-2018 is the Chinese standard "Construction machinery - General specification for spheroidal graphite cast iron". Its scope clause reads: 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. Its clauses include terms and definitions; requirements.

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Document preview — JB/T 5938-2018

National Standard of the People's Republic of China

ICS: 53.100
Replacing: JB/T 5938-1991

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

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

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.

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.

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 […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

Cited by

Similar standards

GB/T 25390-2024|GB/T 9441-2021|NB/T 20008.26-2017|GB/T 28702-2012|JB/T 9104-2013|JB/T 5937-2018

Editions of JB/T 5938

Edition	Title	Revision	Status
JB/T 5938-2018	Construction machinery - General specification for spheroidal graphite cast iron	current edition	Current
JB/T 5938-1991	Construction machinery - General specification for spheroidal graphite cast iron	previous edition	Superseded

This page sells the current edition, JB/T 5938-2018. Earlier editions are listed for reference only.

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