... 5-200mmWidely used in ship,liquid service,ptroleum craking,chemical fertilizer equipment,high pressure boiler,low & mid-pressure boiler, ... electric power,resisting very high or low tempreture,chemical industry,petroleum service,corrossion resistant,etc.High-pressure ... 1Cr5MoGB6479-200025-426mm, 6-40mmMainly used in chemical equipment,fertilizer equipment and pipelines under high pressure or high ...