... 19888-1240mm, 1-200mmApplied to electric power,resisting very high or low tempreture,chemical industry,petroleum service,corrossion resistant ... in chemical equipment,fertilizer equipment and pipelines under high pressure or high tempretureOil casing pipeAPI J55, API K55, API L80 ... used in the construction,pipe of industrial,water pipe,fence equipment,telecommunication tubes as well as green house tubes ...