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GB/T 7216-2023: Metallographic test for grey cast iron Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 7216: Historical versions
Similar standardsGB/T 7216-2023: Metallographic test for grey cast iron---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT7216-2023GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.080.10 CCS J 31 Replacing GB/T 7216-2009 Metallographic test for grey cast iron (ISO 945-1.2019, Microstructure of cast irons - Part 1.Graphite classification by visual analysis, MOD) Issued on. MAY 23, 2023 Implemented on. MAY 23, 2023 Issued by. State Administration for Market Regulation. Standardization Administration of PRC. Table of ContentsForeword... 3 1 Scope... 6 2 Normative references... 6 3 Terms and definitions... 6 4 Specimen preparation... 6 5 Inspection items and rating chart... 7 6 Result representation... 22 7 Test report... 23 Appendix A (Informative) Comparison of clause number between this document and ISO 945-1.2019... 24 Appendix B (Informative) Technical differences between this document and ISO 945- 1.2019 and their reasons... 25 Appendix C (Informative) Example of typical flake graphite distribution morphology ... 27 Appendix D (Informative) Graphite type identification by image analysis... 29 Appendix E (Informative) Phosphorus eutectic type... 30ForewordThis document was drafted in accordance with the provisions of GB/T 1.1-2020 "Directives for standardization - Part 1.Rules for the structure and drafting of standardizing documents". This document replaces GB/T 7216-2009 "Metallographic test for gray cast iron". Compared with GB/T 7216-2009, in addition to structural adjustments and editorial changes, the main technical changes are as follows. a) CHANGE the scope of application of the standard (see Chapter 1; Chapter 1 of the 2009 edition); b) ADD the terms and definitions (see Chapter 3); c) CHANGE the graphite distribution chart (see Figure 1; Figure 1 ~ Figure 6 of the 2009 edition); d) CHANGE the graphite length measurement method (see 5.2.2; 4.2.1 of the 2009 edition); e) CHANGE the graphite length grade reference chart (see Figure 2; Figure 7 ~ Figure 14 of the 2009 edition); f) ADD the calculation method of graphite content (see 5.3); g) CHANGE the pearlite content chart (see Figure 3; Figure 15 ~ Figure 22 of the 2009 edition); h) CHANGE the carbide content chart (see Figure 4; Figure 23 ~ Figure 28 of the 2009 edition); i) CHANGE the phosphorus eutectic content chart (see Figure 5; Figure 29 ~ Figure 34 of the 2009 edition); j) CHANGE the magnification for detecting the number of eutectic clusters (see 5.7.1; 4.6.1 of the 2009 edition); k) CHANGE the diameter of the 50x magnification photo of the eutectic cluster (see Table 6; Table 6 of the 2009 edition); l) CHANGE the eutectic cluster number chart (see Figure 6 ~ Figure 13; Figure 35 ~ Figure 42 of the 2009 edition); m) CHANGE the expression method of graphite shape and length (see 6.1 and 6.2; 5.1 and 5.2 of the 2009 edition); n) ADD the examples of expressions of graphite shape and length (see 6.1 and 6.2). This document modifies and adopts ISO 945-1.2019 "Microstructure of cast irons - Part 1.Graphite classification by visual analysis". Compared with ISO 945-1.2019, this document has many structural adjustments. See Appendix A for the comparison of structure numbers between the two documents. Compared with ISO 945-1.2019, this document has many technical differences. The terms involved are marked with a vertical single line (|) in the outer margin of the page. These technical differences and their reasons are as shown in Appendix B. Compared with ISO 945-1.2019, this document has also made the following editorial changes. - CHANGE the name of the document from ISO 945-1.2019 "Microstructure of cast irons - Part 1.Graphite classification by visual analysis" to "Metallographic test for gray cast iron". This document adopts Type I and Type II graphite in ISO 945- 1.2019; - ADD the Appendix A, Appendix B, Appendix D, Appendix E. Please note that some content in this document may be subject to patents. The publisher of this document assumes no responsibility for identifying patents. This document was proposed by AND shall be under the jurisdiction of the National Casting Standardization Technical Committee (SAC/TC 54). Drafting organizations of this document. CRRC Qishuyan Locomotive and Rolling Stock Technology Research Institute Co., Ltd., Weichai Power Co., Ltd., Zhejiang Mechanical and Electrical Design Institute Co., Ltd., Wuhu Xinxing Cast Pipe Co., Ltd., Guangxi Yuchai Machine Parts Manufacturing Co., Ltd., Midea Group Co., Ltd., Shandong Huijin Co., Ltd., Hangzhou Hangyang Casting Co., Ltd., Zhejiang Boxing Industry and Trade Co., Ltd., Zhejiang Yueda Precision Forging Co., Ltd., Tianrun Industrial Technology Co., Ltd., Shandong University of Technology, Liyang Xinli Machinery Foundry Co., Ltd., Jinhua Wanliyang Machinery Manufacturing Co., Ltd., Jiangsu Gangrui Precision Machinery Co., Ltd., Yantai Shengsheng Auto Parts Manufacturing Co., Ltd., Shandong Longji Machinery Co., Ltd., Ningbo Tuotie Machinery Co., Ltd., Yantai Standard Metrology Inspection and Testing Center, Zhejiang Kunbo Precision Technology Co., Ltd., Huzhou Dingsheng Machinery Technology Co., Ltd., Changge Fuxing Auto Parts Co., Ltd., Tongyu Heavy Industry Co., Ltd., Shandong Huifeng Casting Technology Co., Ltd., Cixi Huili Mechanical and Electrical Co., Ltd., Zhejiang Mechanical and Electrical Vocational and Technical College, Hangzhou Liande Precision Machinery Co., Ltd., Xixia County Zhongde Auto Parts Co., Ltd., Yuzhou Henglilai New Materials Co., Ltd., Anhui Yulong Mold Casting Co., Ltd., Hohai University, Benxi Iron and Steel (Group) Machinery Manufacturing Co., Ltd., Liyang Wansheng Casting Co., Ltd., Shanghai Gongwu High-tech Industrial Development Co., Ltd., Guangdong Jinzhili Technology Co., Ltd., Xinxing Cast Pipe Co., Ltd., Zhejiang Bairun Kitchen Products Co., Ltd., Jiuquan Iron and Steel (Group) Co., Ltd., SAIC Maxus Automobile Co., Ltd., SAIC Volkswagen Co., Ltd., Ningbo Branch of China Academy of Ordnance Science, Shenyang Casting Research Institute Co., Ltd., Guizhou Building Materials Product Quality Inspection and Testing Institute, Zhangzhou Hengchang Machinery Manufacturing Co., Ltd., Zhangzhou Haili Machinery Manufacturing Co., Ltd., Fuxin Lida Steel Casting Co., Ltd. The main drafters of this document. Pan Anxia, Ren Haojuan, Chen Kaimin, Deng Han, Wang Zehua, Jin Li, Jiang Ailong, Chen Yongfeng, Zhang Qiang, Shi Longhua, Wu Qihua, Wu Baocheng, Cong Jianchen, Li Shengzhu, Ma Yongming, Zhang Jie, Chen Xinhua, Shi Lifang, Hai Fenglong, Liang Huilei, Wang Rui, Yao Junhong, Qian Feng, Zhou Kangkang, Xu Gangqiang, Cao Liwei, Ren Hualin, Yi Liyan, Liang Lisheng, Liu Yuli, He Guanshui, Wang Haijie, Ruan Jiangang, Xu Wenda, Cui Lanfang, Liu Weiming, Zhang Wenwei, Chen Jianhua, Zhang Song, Xu Gangqiang, Wu Chao, Xiang Zhengyu, Hou Dongliang, Wang Yufang, Tian Zhongqing, Huang Liankai, Xiang Liang, Liu Qingkun, Liu Xianmin, Zhou Changmeng, Tian Long, Fu Xiaoyun, Xie Zhongyun, Liu Yan, Gao Renqiang, Zhang Youyu, Zhao Jie, Deng Shouliang, Qiu Zhonghua, Chen Yihan, Yao Jun, Xu Yusheng, Zhang Peng, Zheng Wanxin, Qin Man, Xu De'an, Lv Jianpan, Liu Jiance, Liu Sha. This standard replaces the standard previously issued as follows. - It was first published as GB/T 7216-1987 in 1987.It was first revised in 2009; - This is the second revision. Metallographic test for grey cast iron1 ScopeThis document specifies the preparation of specimens, inspection items and rating charts, result representation, test reports for metallographic examination of gray cast iron.2 Normative referencesThe contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, for dated reference documents, only the version corresponding to the date applies to this document; for undated reference documents, the latest version (including all amendments) applies to this document. GB/T 5611 Foundry terminology GB/T 13298 Inspection methods of microstructure for metals3 Terms and definitionsThe terms and definitions defined in GB/T 5611, as well as the following terms and definitions, apply to this document. The maximum straight-line distance between any two points on the graphite sheet outline.4 Specimen preparation4.1 Metallographic specimens shall be taken from the test block or casting; the detection surface shall avoid the casting surface. 4.2 Metallographic specimens are prepared in accordance with the provisions of GB/T 13298.During the process of intercepting and preparing metallographic specimens, changes in the structure, graphite peeling, graphite tailing shall be prevented. The surface of the specimen shall be smooth and clean; there shall be no coarse scratches.5 Inspection items and rating chart5.1 Graphite distribution morphology 5.1.1 To examine the graphite distribution morphology in the polished state, first observe the entire inspected surface; compare the graphite morphology in most fields of view with the corresponding rating chart, with a magnification of 100x. 5.1.2 According to the distribution form of graphite, it is divided into 6 types, as shown in Figure 1; detailed description is as shown in Table 1.6 Result representation6.2 The length of graphite is expressed in terms of grades or length values. If the graphite observed in different fields of view includes two length grades, the two length grades of graphite can be described as. 3/4.By using an underline at a certain grade number, it is indicated that graphite of that grade accounts for the majority. 6.3 Graphite content, pearlite content, carbide content, phosphorus eutectic content are expressed by corresponding grade names or percentages; if the total content of carbide and phosphorus eutectic does not exceed 5%, the two can be combined for assessment.7 Test reportThe test report shall include at least the following parts. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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