ansi 9standards0 code issues - ansi a312 and a320
 

ansi ansi a312 and a320?
dear friends
what do these specs refer to? my guess is they are stainless steel grades or specification but i am new to stainless steel
respects
ijr
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a312 seamless stainless steel pipe
a320 - standard specification for alloy steel bolting materials for low- temperature service
astm a312 relates to austenetic stainless grades of piping - a320 - alloy bolting