ASTM A312 is marked standard of the American Society for testing and materials on austenitic stainless steel welded steel pipe seamless steel tube.

Chermical composition of ASTM A312 standard stainless steel seamless pipe:

Size tolerance of ASTM A312 standard stainless steel seamless pipe:

The length is less than or equal to 24ft (7.3m),and the tolerance is +1/4in(6mm)/0. ; length of more than 24ft (7.3m) the tolerance is resolved by manufacturer and purchaser consultation.

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