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GB/T 45684-2025: Grey cast irons - Classification
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Grey cast irons - Classification
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GB/T 45684-2025
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Basic data | Standard ID | GB/T 45684-2025 (GB/T45684-2025) | | Description (Translated English) | Grey cast irons - Classification | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J31 | | Classification of International Standard | 77.140.80 | | Word Count Estimation | 30,317 | | Date of Issue | 2025-05-30 | | Date of Implementation | 2025-12-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 45684-2025: Grey cast irons - Classification---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 77.140.80
CCSJ31
National Standard of the People's Republic of China
Gray cast iron classification
(ISO 185.2020,MOD)
Released on 2025-05-30
2025-12-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of contents
Preface III
Introduction IV
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Grade 2
5 Ordering requirements 2
6 Manufacturing 2
7 Technical Requirements 2
8 Sample preparation 6
9 Inspection Methods 10
10 Retest 12
Appendix A (Informative) Comparison table of chapter numbers between this document and ISO 185.2020 13
Appendix B (Informative) Technical differences between this document and ISO 185.2020 and their reasons 14
Appendix C (informative) Additional information on mechanical and physical properties of grey cast iron 15
Appendix D (Informative) Relationship between hardness and tensile strength of grey cast iron 17
Appendix E (informative) Additional information on the relationship between tensile strength, hardness and wall thickness of grey iron castings 19
Appendix F (Informative) Comparison table of grey cast iron grades between this document and other standards 22
Reference 23
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document is modified to adopt ISO 185.2020 "Classification of grey cast iron".
Compared with ISO 185.2020, this document has more structural adjustments. Appendix A lists the differences between this document and ISO 185.2020.
A comparison table of chapter and article numbers.
This document has many technical differences compared to ISO 185.2020.
A list of these technical differences and their causes is given in Appendix B.
Compared with ISO 185.2020, the following editorial changes have been made to this document.
--- Modified the format of the notes in Table 3;
--- Modified the dimensioning format of Figures 1, 2 and 3.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed and coordinated by the National Casting Standardization Technical Committee (SAC/TC54).
This document was drafted by. Shandong University of Technology, Tianrun Industrial Technology Co., Ltd., Jiangxi Shenglisu CNC Machinery Co., Ltd., East Asia
Technology (Suzhou) Co., Ltd., Weichai Power Co., Ltd., Guangxi Jinchuang Auto Parts Manufacturing Co., Ltd., Shandong Tianli Machinery Casting
Co., Ltd., China Machinery Engineering Institute Group Shenyang Foundry Research Institute Co., Ltd., Hangzhou Hangyang Foundry Co., Ltd., Changluo (Liaocheng) Intelligent Manufacturing
Co., Ltd., Shandong Huijin Co., Ltd., Hebei University of Technology, Zhejiang Mechanical and Electrical Vocational and Technical University, Weihai Wendeng District Market Supervision and Administration
Comprehensive Service Center, Tongyu Heavy Industry Co., Ltd., Huizhou Jinzhu Equipment Casting Co., Ltd., Linqing Jinguang Machinery Manufacturing Co., Ltd.,
Qingzhou Junkai Industrial Equipment Co., Ltd., Luoyang Gucheng Machinery Co., Ltd., Shenzhen Haitengda Machinery Equipment Co., Ltd., Ningbo Yierda
Hardware Industry and Trade Co., Ltd., CRRC Qishuyan Locomotive and Rolling Stock Technology Research Institute Co., Ltd., and Shandong Jinlei New Energy Heavy Equipment Co., Ltd.
The main drafters of this document are. Cong Jianchen, Sun Jun, Liu Jibo, Ge Wenqing, Ren Xianwei, Chen Kaimin, Wang Darui, Yan Haifeng, Ju Chuanshui,
Qian Dongfang, Wang Lilin, Dai Xuezhong, Deng Han, Yang Zhisen, Zhang Jie, Yu Jianjun, Zhang Yin, Yu Xuru, Jiao Jinguo, Li Xihua, Xiang Liang, Sheng Yukai,
Wang Hongwei, Fu Binguo, Xie Xun, You Xiaoyang, and Wang Rui.
Introduction
The grey cast irons covered by this document are divided into two categories.
--- Classification according to tensile strength;
---Classified according to hardness.
It can also be classified by tensile strength and hardness.
NOTE. This document does not include technical delivery conditions for grey cast iron.
The properties of grey cast iron depend on the shape and distribution of graphite and the matrix structure.
For many applications, casting designers are not only concerned with tensile strength and hardness. Other mechanical or physical properties may determine the
Application of iron. For example.
---Thermal conductivity and thermal diffusivity of the brake disc;
--- Damping performance of engine block and machine tool;
---Thermal cycle fatigue performance of exhaust manifold and ingot mold.
Therefore, Annex C gives additional information for the attention of casting designers.
also.
--- Appendix D gives additional information on the relationship between hardness and tensile strength;
--- Appendix E gives additional information on the relationship between tensile strength, hardness and main wall thickness of grey iron castings;
--- Appendix F provides a comparison table of gray cast iron grades in ISO 185 and other standards.
Gray cast iron classification
1 Scope
This document specifies the grades, ordering requirements, manufacturing, technical requirements, specimen preparation, inspection methods and re-inspection of grey cast iron.
This document applies to unalloyed and low-alloy grey cast iron for castings in sand moulds or moulds with thermal conductivity equivalent to that of sand moulds.
Grey cast iron for pipes, pipe fittings and continuous casting products. This document does not include the technical delivery conditions for grey iron castings.
2 Normative references
The contents of the following documents constitute essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 228.1 Tensile tests on metallic materials - Part 1.Test methods at room temperature (GB/T 228.1-2021, ISO 6892-1.
2019,MOD)
GB/T 231.1 Metallic materials Brinell hardness test Part 1.Test method (GB/T 231.1-2018, ISO 6506-1.
2014,MOD)
GB/T 5612 Method for indicating cast iron grades
GB/T 7216 Metallographic Examination of Grey Cast Iron (GB/T 7216-2023, ISO 945-1.2019, MOD)
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Grey cast iron
Cast iron with iron and carbon as basic elements, with carbon mainly in the form of flake graphite.
Note 1.Grey cast iron is also called flake graphite cast iron, and is less commonly referred to as lamellar graphite cast iron.
Note 2.Graphite morphology, distribution and size are specified in GB/T 7216.
3.2
Relevant wal thickness of castings
The thickness of the casting section, which is agreed upon by the supplier and the buyer, represents the mechanical properties of the casting material.
3.3
separately cast sample
Test bars cast in a separate mould under casting conditions and materials representative of the casting
3.4
Side-by-side cast sample
A test bar cast side by side with the casting and connected to the casting using the same gating system.
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