... Suppy seamless pipe. Standard: ASTM, API, JIS, GB, , DIN Grade: ASTM A106, AA53, API J55, K55, L80, P110,.etc. Seamless Steel pipe: Standard: ASTM, ... API, JIS, GB, DINGrade: ASTM A106, A53, API J55, K55, ... , chemical engineering and electric power.(3)Temperature-resistant seamless steel pipe for high-pressure boiler(4)For refinery ...