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GB/T 8731-2008 Free-cutting structural steel

Standard Number:  GB/T 8731-2008
Title:  Free-cutting structural steel
Language:  Simplified Chinese
Publication Date:  2008/9/11
Execute Date:  2009/5/1
Adopted International Standard:  GB/T 10561;GB/T 14981;GB/T 15711;GB/T 17505;GB/T 1979;GB/T 20066;GB/T 20123;GB/T 20125;GB/T 2101;GB/T 2103;GB/T 222;GB/T 223.11;GB/T 223.12;GB/T 223.19;GB/T 223.23;GB/T 223.29;GB/T 223.3;GB/T 223.50;GB/T 223.58;GB/T 223.59;GB/T 223.60;GB/T 223.61;GB/T 223.62;GB/T 223.63;GB/T 223.64;GB/T 223.67;GB/T 223.68;GB/T 223.69;GB/T 223.71;GB/T 223.72;GB/T 223.74;GB/T 223.77;GB/T 224;GB/T 226;GB/T 228;GB/T 229;GB/T 231.1;GB/T 247;GB/T 2975;GB/T 3207;GB/T 342;GB/T 4336;GB/T 702;GB/T 708;GB/T 709;GB/T 905;GB/T 908
Status:  Current
Standard Type:  Product
International Classification for Standards (ICS)METALLURGY>>Iron and steel products>>Iron and steel products in general
Publisher:  Chinese Standards(GB)
Number of Pages:16  

Preface: Instead of this standard GB/T8731-1988 "free-cutting steel and technical conditions". Compared with the original standard of this standard, the main revision content is as follows: - was added into the scope of the steel plate and steel belt steel (see chapter 1); - reference ISO683  9:19 98 definition, increased the free-cutting steel The definition of (see chapter 3); - increases the classification (see chapter 4); - increase the content of the order (see chapter 5). - deleted in the original standard for hot rolled, cold drawn steel bar, steel wire and silver steel size, shape and allowable deviation form, instead of writing (in 1998 version of table 1, this version 6.1 ); - in the modified the original standard Y12PB composition range, increased Y08, Y45, Y15MN, Y45MNS, Y08PB, and other commonly used foreign brands; And add the part of patent ZL03122768.6 brand Y08SN, Y15SN, Y45SN, Y45MNS N and other domestic manufacturers are production using brand Y08MNS, Y35MN, Y45MN, Y45MNSPB (see table 1 and table 2, table 3). - increased not stipulated in GB/T222 tin and sulfur elements beyond the prescribed scope of the finished product ingredients allowed deviation (see table 5). - increase The provisions of the smelting method (see 7.2); - the delivery status in item added to silver state delivery (see 7.3); - changes the original standard, to the requirement of tensile mechanical properties of steel, amend will hold their value as A reference coordinate in appendix A (1998) in table 3, table 4, table 5 and table 6, this edition is appendix A). - changes the surface quality requirement, hot rolled steel, wire rod, such as hot forging steel surfaces allows references to the related provisions of GB/T699 defect depth, silver steel implement the relevant provisions in GB/T3207, increase the steel strip surface quality requirements (in 1988 version 2.7, this version 2.7); -- -- -- Increase the provisions of this standard brand corresponding relationship with foreign related brand of appendix B. Appendix A of this standard and appendix B are informative appendices. This standard put forward by the China iron and steel association. This standard by the national standardization technical committee under centralized steel. This standard drafting unit: shougang corporation, northeast special steel group co., LTD., guiyang special Steel co., LTD., Qingdao iron and steel group corporation, information standards institute of metallurgy industry. Main drafter of this standard: GongCui, Zhu Chen, wang liping, willow, chun-hong zhang, Zhou Yinghao, Tian Qiaoli, Zhang Qizhu. This standard replaced all previous releases of standard: GB/T8731-1988.   
Description:This standard stimulates the free-cutting steel scope, terms and definitions, the order of content, size, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, logo and certificate of quality.
this standard applies to mechanical machining steel, wire rod, wire, steel plates and steel strip steel, such as its chemical composition also applies to ingot, billet and its products.  
Cross References:,,,
GB/T223.12 
GB/T223.19 
GB/T223.29 
GB/T223.50 
GB/T223.58 
GB/T228 (GB/T 228-2002 Metallic materials--Tensile testing at ambient temperature,EQVISO6892:1998)
GB/T229 (GB/T 229-2007 Metallic materials - Charpy pendulum impact test method,ISO 148-1-2006/DAmd 1 Metallic materials - Charpy pendulum impact test - Part 1: Test method - Amendment 1: Measurement uncertainty of an absorbed energy value, KV,MOD)
GB/T231.1 1 :  
File Format:  PDF(Acrobat Reader) or Word version doc Document
File Size:  559KB
Tile in English:  Free-cutting structural steel

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