... , GB/T8163 ,ASTM A53 ,ASTM A106 ,DIN1629 , API 5L Steel Grade GB/T8162 , GB/T8163:10#, 20#, ... seamless medium-carbon steel boiler and superheater pipes heat-exchanger pipes. ASTM A 213 specification for seamless ferrite ... X46,X52,X56/X65,X70 and more. Certificate:API spac 5L/5CT,ISO9001:2000 Process method:hot ... 11mm -59.94mm Length:5-12m,customized Standards:API 5L,API5CT,ASTM A106,ANSI,ISO9001,DIN,EN, ...