پشتیبانی سفارشی بادوام astm a312
ASTM A312/A312M-22a. Pipe having other dimensions is permitted to be ordered and furnished provided such pipe complies with all other requirements of this specification. 1.5 Grades TP321 and TP321H have lower strength requirements for pipe manufactured by the seamless process in nominal wall thicknesses greater than ³/ 8 in. [9.5 mm].