... .5-200mmWidely used in ship,liquid service,ptroleum craking,chemical fertilizer equipment,high pressure boiler,low & mid-pressure boiler,etc.Stainless ... 15Cr2Mo 1Cr5MoGB6479-200025-426mm, 6-40mmMainly used in chemical equipment,fertilizer equipment and pipelines under high pressure or high tempretureOil casing ...