GB/T 5612-2025 English PDFUS$279.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 5612-2025: Designation of cast irons Status: Valid GB/T 5612: Historical versions
Basic dataStandard ID: GB/T 5612-2025 (GB/T5612-2025)Description (Translated English): Designation of cast irons Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J31 Classification of International Standard: 77.140.80 Word Count Estimation: 14,149 Date of Issue: 2025-03-28 Date of Implementation: 10/1/2025 Older Standard (superseded by this standard): GB/T 5612-2008 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 5612-2025: Designation of cast irons---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.National Standard of the People's Republic of China ICS 77.140.80CCS J 31 Cast iron grade indication method 2025-03-28 Release 2025-10-01 Implementation State Administration for Market Regulation The National Standardization Administration issued Replace GB/T 5612-2008 Table of contentsPreface Ⅲ 1 Scope...1 2 Normative references ...1 3 Terms and Definitions 1 4 Cast iron classification and code ...1 5 Method of indicating cast iron grades...1 6 Examples of cast iron grades...2 Appendix A (Informative) Comparison between cast iron grades and ISO cast iron grades ...5 References 9ForewordThis 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 is required. This document replaces GB/T 5612-2008 "Methods for indicating cast iron grades". Compared with GB/T 5612-2008, except for structural adjustments and In addition to logical changes, the main technical changes are as follows. a) Added cast iron classification (see 4.1); b) The cast iron code description has been changed (see 4.2, 3.1 of the.2008 edition); c) Added the method of indicating cast iron grades (see Chapter 5, 3.2 and 3.3 of the.2008 edition). 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 Technical Committee on Foundry Standardization (SAC/TC 54). This document was drafted by. China Machinery Engineering Institute Group Shenyang Foundry Research Institute Co., Ltd., CRRC Qishuyan Locomotive and Rolling Stock Technology Research Institute Co., Ltd., Zhejiang Boxing Industry and Trade Co., Ltd., Wuhu Xinxing Casting Pipe Co., Ltd., East Asia Technology (Suzhou) Co., Ltd., Guangxi Yuchai Crankshaft Co., Ltd., Shandong Tianli Machinery Casting Co., Ltd., Hangzhou Hangyang Casting Co., Ltd., Weichai Power Co., Ltd., Shandong Huijin Co., Ltd., Shandong Jinlei New Energy Heavy Equipment Co., Ltd., Riyue Heavy Industry Co., Ltd., Tongyu Heavy Industry Co., Ltd. Co., Ltd., Jinan University, Hohai University, Shandong University of Technology, Zhejiang Mechanical and Electrical Vocational and Technical University, Tongling University, Jiangsu Hongde Special Components Co., Ltd. Co., Ltd., Hubei Sanhuan Casting Co., Ltd., Tianrun Industrial Technology Co., Ltd., Xinxing Casting Pipe Co., Ltd., Ningbo Yier Da Hardware Industry and Trade Co., Ltd., Hebei Juxing Intelligent Equipment Manufacturing Co., Ltd., Linqing Jinguang Machinery Manufacturing Co., Ltd., Jiangsu Kate Automobile Components Co., Ltd. and Wuhu Emerging New Materials Industrial Park Co., Ltd. The main drafters of this document are. Zhang Yin, Deng Han, Wu Qihua, Li Wei, Jin Li, Chen Kaimin, Cong Jianchen, Wang Zehua, Chen Jianhua, Qian Dongfang, Zhang Jie, Yu Xuru, Zhou Kangkang, Zhang Xin, Yu Jianjun, Chen Yongfeng, Wu Baocheng, Yang Zhisen, Chu Dong, Li Chaogui, Zhou Jianjun, Tang Guangwei, Xu Gangqiang, Xie Laiwang, Wang Songlin, Xie Xun, Jiao Honglei, Li Yongliang, Kong Xiangjian, Liu Hongfei, Zhang Yajun, Li Nana, Wei Zhangan. This document was first published in 1985, revised for the first time in.2008, and this is the second revision. Cast iron grade indication method1 ScopeThis document gives the classification of cast irons and the designation of cast iron grades. This document is applicable to various cast iron materials and castings.2 Normative referencesThis document has no normative references.3 Terms and definitionsThere are no terms or definitions that require definition in this document.4 Cast iron classification and code4.1 Classification of cast iron According to the graphite particle morphology in the metallographic structure of cast iron and the existence form of carbon in cast iron, cast iron is divided into gray cast iron, ductile cast iron, vermicular cast iron and so on. There are five major categories. graphite cast iron, malleable cast iron and white cast iron. 4.2 Cast iron code 4.2.1 The basic code of cast iron shall be the first capital letter of the Chinese phonetic alphabet of the type of cast iron, such as grey cast iron, ductile iron, The codes for wrought iron and white cast iron are HT, QT, KT and BT respectively. When the code letters of two cast iron names are the same, the code letter is used. Types of cast iron are composed of the first capital Latin letter of the Chinese phonetic alphabet followed by the second lowercase letter of the pinyin, such as vermicular cast iron is represented as RuT. 4.2.2 The code for cast iron with special properties can be composed of the basic code of cast iron and the first letter of the Chinese phonetic symbol used to indicate the special property. It is composed of capital letters, such as HTM stands for wear-resistant gray cast iron, HTR stands for heat-resistant gray cast iron, and HTS stands for corrosion-resistant gray cast iron. 4.2.3 The code for cast iron produced by special process can be composed of the basic code of cast iron and the other code following it to indicate the name of the special process. The first capital letter of the Chinese phonetic symbol of one or two Chinese characters is used, such as QTD for isothermally quenched ductile iron, HTLZ for continuous Casting grey cast iron. 4.2.4 For the codes of various types of cast iron, see 6.2. 5.Cast iron grade indication method 5.1 Cast iron grades expressed in terms of mechanical properties 5.1.1 When the tensile properties are used to indicate the cast iron grade, the tensile property value is listed after the cast iron code. If there is only one group of numbers after the code, the The first group of numbers indicates the tensile strength value in MPa. MPa, the second group of numbers indicates the elongation value in %, and the two groups of numbers are separated by “⁃”. 5.1.2 When hardness is used to indicate cast iron grades, the hardness code and hardness value are placed after the cast iron code, with the hardness code between the cast iron code and the hardness code. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 5612-2025_English be delivered?Answer: Upon your order, we will start to translate GB/T 5612-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 5612-2025_English with my colleagues?Answer: Yes. 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