Onye na-ere ahịa na onye na-eweta ASTM A249 Tube

ASTM A249 / A249M – 16a

Nọmba aha ASTM na-achọpụta ụdị pụrụ iche nke ọkọlọtọ ASTM.

A249 / A249M – 16a

A = ọla ferrous;

249 = nọmba usoro e kenyere

M = nkeji SI

16 = afọ nke nnabata mbụ (maọbụ, n'ihe gbasara mgbanwe, afọ nke mgbanwe ikpeazụ)

a = na-egosi mgbanwe ndị ọzọ na-esote n'otu afọ ahụ