... ptroleum craking,chemical fertilizer equipment,high pressure boiler,low & mid-pressure boiler,etc.Stainless Steel Pipe300 SeriesGB,JIS,ASTM, ... 1240mm, 1-200mmApplied to electric power,resisting very high or low tempreture,chemical industry,petroleum service,corrossion ... in chemical equipment,fertilizer equipment and pipelines under high pressure or high tempretureOil casing pipeAPI J55, API K55, API ...