About induction hardened surface layer grain size
"If nothing else is indicated, the grain size in the induction hardened surface layer be ISO index G=7 or finer which corresponds to an average grain size of max 30μm. "What's mean "ISO index G=7"?
I guess it is"Grade 7" , but Idon't know which ISO standard? And which chinese standard corresponds to it?
Please help me! thank you very much! I think that ISO refers to International Standardization Organization.
" index"should be interpreted as "provision". you can search the iso spec on the web site.
but I think you just need know the "corresponds to an average grain size of max 30μm"
:lol http://www.iso.org In the first page in the some GB/T standards, you can see GB****=ISO*****, that mean the info in the 2 standard is the same, pls find the the GB standard about grain size evaluation,if the you can seeGB****=ISO*****, word ,that mean the same info with ISO, then it can be referenced. the standard GB is GB/T6394-2002 原帖由 jysh81 于 2009-4-24 14:06 发表 http://www.rclbbs.com/images/common/back.gif
the standard GB is GB/T6394-2002
GB and ISO are very identical in terms of grain size. You can also refer ASTM E112. Many GB standards copy or refer to other countrys`, such as Japanese and American. Nowdays, in order to make all standards follow in all countrys of the world. Those people who called "ISO" make the ISO standards. Grade 7 in GB/T6394-2002,And the size is 28.24um,so it is equal to theiso standard you provide !
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