About induction hardened surface layer grain size

wqz198 · 发表于 2009-4-19 16:44:43

"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!

陆丰 · 发表于 2009-4-19 19:35:25

I think that ISO refers to International Standardization Organization.
" index"should be interpreted as "provision".

maxdew · 发表于 2009-4-23 11:15:25

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"

maxdew · 发表于 2009-4-23 11:17:15

http://www.iso.org

greatmanzhang · 发表于 2009-4-23 17:26:05

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 see GB****=ISO*****, word ,that mean the same info with ISO, then it can be referenced.

jysh81 · 发表于 2009-4-24 14:06:31

the standard GB is GB/T6394-2002

lanwenbiao · 发表于 2009-5-26 16:27:45

原帖由 jysh81 于 2009-4-24 14:06 发表
the standard GB is GB/T6394-2002

GB and ISO are very identical in terms of grain size.

jumnshen · 发表于 2010-1-12 10:47:46

You can also refer ASTM E112.

zbw99012333 · 发表于 2010-4-23 11:42:32

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.

Diego001 · 发表于 2010-5-8 15:13:35

Grade 7 in GB/T6394-2002,And the size is 28.24um,so it is equal to the iso standard you provide !

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[Help] About induction hardened surface layer grain size

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