... : GB/T14975-2002, GB/T14976-2002, GB13296-91, GB9948-88, ASTM A312, ASTM A213, ASTM A269, ASTMA511, DIN17456,JIS3459 2) Grade: AISI 304, 304L ... petroleum, smelting, foodstuff, power, papermaking, chemical, medical equipment, aviation, boiler heat exchanger, and other fields heat-exchanger tube