... and proof pressure, and are suit for Petrochemical Industry. ASTM A312 is a Standard Specification for Seamless, Welded, and Heavily Cold Worked ... meeting the ASTM A249/A269, A270, A312, A554 and DIN 118509 requirements.We are always improving our technique about welded ... ASTM A554, ASTM A249, ASTM A269, ASTM A270, ASTM A312,DIN 118504) Mark: Steel Seal and Label5) Applied field: Decoration, Heat ...