Search result: GB/T 26656-2023 (GB/T 26656-2011 Older version)
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Metallographic test for compacted (vermicular) graphite cast irons
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GB/T 26656-2023
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| GB/T 26656-2011 | English | 759 |
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Metallographic test for compacted (vermicular) graphite cast irons
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GB/T 26656-2011
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| Standard ID | GB/T 26656-2023 (GB/T26656-2023) | | Description (Translated English) | Metallographic test for compacted (vermicular) graphite cast irons | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J31 | | Classification of International Standard | 77.080.10 | | Word Count Estimation | 22,252 | | Date of Issue | 2023-05-23 | | Date of Implementation | 2023-05-23 | | Older Standard (superseded by this standard) | GB/T 26656-2011 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Management Committee |
GB/T 26656-2023: Metallographic examination of vermicular graphite cast iron
ICS 77:080:10
CCSJ31
National Standards of People's Republic of China
Replacing GB/T 26656-2011
Metallographic examination of vermicular graphite cast iron
Released on 2023-05-23
2023-05-23 implementation
State Administration for Market Regulation
Released by the National Standardization Management Committee
table of contents
Preface I
1 Range 1
2 Normative references 1
3 Terms and Definitions 1
4 Preparation of metallographic samples 1
5 Inspection Items and Rating 1
Appendix A (Informative) Graphite Classification 10
Appendix B (Informative) Morphology of Vermicular Graphite 12
Appendix C (informative) Determination of creep rate of vermicular graphite cast iron 16
Reference 18
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 replaces GB/T 26656-2011 "Metallographic Examination of Vermicular Graphite Cast Iron": Compared with GB/T 26656-2011, except for structural adjustment and
Apart from editorial changes, the main technical changes are as follows:
a) The scope of application has been changed (see Chapter 1, Chapter 1 of the:2011 edition);
b) Added the terms and definitions of "maximum Fred's circle diameter" and "particle roundness" (see 3:1, 3:2);
c) The calculation formula of creep rate has been changed (see 5:1:2, 4:1:2 of the:2011 edition);
d) Changed the expression method of creep rate value range, and replaced the creep rate classification diagram (see 5:1:4, 4:1:6 of the:2011 edition);
e) Changed the expression method of pearlite content and the corresponding pearlite content grading evaluation reference map (see 5:2,:2011 edition
4:2:2);
f) Changed the expression method of phosphorus eutectic content and the corresponding phosphorus eutectic content grading evaluation reference map (see 5:3,:2011 edition
4:3:2);
g) Changed the representation method of carbide content and the corresponding carbide content grading and evaluation reference map (see 5:4,:2011 edition
4:4:2):
Please note that some contents of this document may refer to patents: The issuing agency of this document assumes no responsibility for identifying patents:
This document is proposed and managed by the National Foundry Standardization Technical Committee (SAC/TC54):
This document was drafted by: CRRC Qishuyan Locomotive and Rolling Stock Technology Research Institute Co:, Ltd:, Weichai Power Co:, Ltd:, Liyang Xinli
Machinery Casting Co:, Ltd:, Guangxi Yuchai Machinery Parts Manufacturing Co:, Ltd:, Midea Group Co:, Ltd:, Zhejiang Weishang Machinery Co:, Ltd:,
Shandong Longji Machinery Co:, Ltd:, Xixia County Internal Combustion Engine Inlet and Exhaust Pipe Co:, Ltd:, Shanxi Sanlian Sunco Auto Parts Co:, Ltd:,
Hebei Andy Mold Co:, Ltd:, Xixia County Zhongde Auto Parts Co:, Ltd:, Zhejiang Mechanical and Electrical Vocational Technical College, Jiangsu Kite Auto Parts Co:, Ltd:
Co:, Ltd:, Wuhu Xinxing Casting Pipe Co:, Ltd:, Xinxing Casting Pipe Co:, Ltd:, Hohai University, Yantai City Standard Metrology Inspection and Testing
Xin, Xiangyang Jinnaite Machinery Co:, Ltd:, Tongyu Heavy Industry Co:, Ltd:, Shanghai Volkswagen Automobile Co:, Ltd:, Shandong Huijin Co:, Ltd:
Company, Penglai Sanhe Casting Co:, Ltd:, Liaocheng Xinluo Machinery Co:, Ltd:, Shanghai Gongwu High-tech Industry Development Co:, Ltd:, Luoyang Gucheng Machinery Co:, Ltd:
Machinery Co:, Ltd:, Guangdong Jinzhili Technology Co:, Ltd:, and Guizhou Provincial Building Materials Product Quality Inspection and Testing Institute:
The main drafters of this document: Li Pingping, Deng Han, Lu Wenting, Chen Kaimin, Wang Zehua, Jiang Ailong, Wu Qihua, Wu Baocheng, Zhang Qiang, Shi Longhua,
Li Shengzhu, Mu Yanqing, Yu Guangyuan, Dong Peng, Pan Anxia, Chen Xinhua, Chen Yongfeng, Chen Jianhua, Qian Feng, Yao Junhong, Ruan Fang, Sun Zhenguo, Liu Yuli,
Zhou Kangkang, Cheng Haochuan, Yang Shuangjie, Zhang Xuejun, Zhang Guixian, Cui Lanfang, Ren Huawei, Shuai Dejun, Ruan Jiangang, Zhang Jie, Zhang Wenwei, Liu Honglei,
Tian Zhongqing, Li Ping, Tian Zheng, Huang Liankai, Li Jianbo, Wang Lilin, Feng Jiabo, Ren Xianwei, Qin Yanping, Xu Dean:
This document was first published in:2011, and this is the first revision:
Metallographic examination of vermicular graphite cast iron
1 Scope
This document specifies the preparation, inspection items and rating of metallographic specimens of vermicular graphite cast iron:
This document is applicable to the identification of graphite morphology of sand-cast vermicular graphite cast iron, as well as the vermicularization rate, pearlite, phosphorus eutectic and carbide quantity and distribution:
level assessment:
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references
For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
this document:
GB/T 13298 Metal Microstructure Examination Method
3 Terms and Definitions
The following terms and definitions apply to this document:
3:1
Maximum Féret diameter maximum Féretdiameter
lm
The maximum linear distance between any two points on the outer contour of graphite particles:
3:2
particle roundness particleroundness
The area of a graphite particle divided by the circle area of the largest Fred's circle diameter of the graphite particle:
4 Preparation of metallographic samples
4:1 The metallographic sample should be taken from the test block or casting, and the testing surface should avoid the casting surface:
4:2 The metallographic sample shall be prepared according to the provisions of GB/T 13298: During the process of intercepting and preparing the metallographic sample, it shall prevent the organization from changing and graphite peeling off:
The surface of the sample should be smooth and clean, and there should be no coarse scratches:
5 Inspection items and ratings
5:1 Classification and evaluation of creep rate
5:1:1 Graphite Morphology
Graphite form is divided into six categories, see Appendix A:
The morphology of graphite in vermicular graphite cast iron is mainly vermicular graphite (type III), and a small amount of spherical (group) graphite (type V, type VI) and group flocculent graphite:
......
GB/T 26656-2011
Metallographic test for compacted (vermicular) graphite cast irons
ICS 77.040.99
J31
National Standards of People's Republic of China
Compacted graphite iron metallography
Metalographictestforcompacted (vermicular) graphitecastirons
Issued on. 2011-06-16
2012-03-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Preface Ⅰ
1 Scope 1
2 Normative references 1
Metallographic sample preparation 3 1
1 4 test items and ratings
Appendix A (informative) graphite classification 9
Annex B (informative) graphite morphology 11
(Informative) Determination Appendix C compacted graphite iron vermicularity 13
Foreword
This standard is based on GB/T 1.1-2009 writing rules drafted.
The standard reference to international standard ISO 16112.2006 "compacted graphite iron category" in Appendix B of the relevant content re-enacted.
--- The standard rate will creep into eight levels.
--- Using the ISO 16112.2006 standard in Appendix B of the creep rate ≥95%, 90%, 85%, 80% metallurgical grade four pictures.
--- Appendix A of this standard is quoted from ISO 945 graphite classification.
--- Reference to ISO 16112.2006 Standard Appendix B, with the area method to calculate the creep rate of compacted graphite cast iron.
This standard by the National Foundry Standardization Technical Committee (SAT/TC54) and focal points.
This standard is drafted by. Shandong Zibo Co., compacted graphite iron.
Participated in the drafting of this standard. Zhengzhou Machinery Research Institute, Dongfeng Motor Corporation, Sun Moon Heavy Industries Co., Ltd., Xixia County internal combustion engine intake and exhaust
Trachea limited liability company, Shandong Machinery Design Institute, Wuxi FAW Foundry Co., Ltd., Shandong sophisticated Hoi-wai Machinery Co., Ltd. Shenyang
Foundry Research Institute.
Drafters of this standard. Wen Jing Bao, Zhang Qiu, Wan Ren Fang, Françoise Yip, Yungang Wang, Song Yin-fat, Zhao Xinwu, Zhang Zhiyong, HAN Zhen, the
Zhang Heng rock Iraq beginning of winter, Yin Chang.
Compacted graphite iron metallography
1 Scope
This standard specifies the metallographic sample preparation, testing and rating items.
This standard applies to compacted graphite iron graphite morphology identification, assessment creep rate, pearlite, phosphorus eutectic carbides and the number of classification.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 13298 metallographic inspection method
3 metallographic sample preparation
3.1 metallographic sample should be cast simultaneously with the casting, heat treatment furnace with the test piece or cast cut.
3.2 metallographic sample preparation according to GB/T 13298 regulations, cut and process for preparing metallographic specimens should prevent tissue changes, stone
Ink and graphite flake trailing sample surface should be smooth, not allowed to have scratches.
4 test items and ratings
4.1 Classification and assessment of the creep rate
4.1.1 graphite morphology
Vermicular graphite cast iron is mainly in Appendix A worm-like graphite (Ⅲ type), and a small amount of spheroidal graphite (Ⅵ type) and slug, Xu group
Graphite (Ⅳ, Ⅴ type) exists, and does not allow fine flake graphite flake (Ⅰ, type Ⅱ).
Vermicular graphite form in Appendix B.
4.1.2 Calculation of creep rate (not allowed in the presence of compacted graphite iron flake graphite)
This standard specifies the creep rate calculated according to area method.
Vermicularity = ΣA vermicular graphite 0.5ΣA slug, each group flocculent graphite graphite ΣA ×
100% (1)
Where.
Area A worm-like graphite --- worm-like graphite particles; (RSF round coefficient is < 0.525);
A slug, slug --- group flocculent graphite, area group flocculent graphite particles; (RSF round coefficient 0.525 ~ 0.625);
A graphite --- Each Each graphite particles (maximum length center ≥10μm) area.
Compacted graphite iron calculated creep rate are shown in Appendix C.
4.1.3 Test creep rate, magnified 100 times, depending on the field diameter of 70mm or smaller than this area, the perimeter of the field of view, excluding the cut graphite,
Magnified 100 times, a small amount of < 1mm (actual size 10μm, vision area 0.785mm2) graphite do not count.
4.1.4 Test vermicularity grade graphite in the polishing state election zoom in principle 100 times round the press Appendix C coefficient (RSF) on stone
......
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