1)Seamless pipes for petroleum 2)Size:1/4"-36"*Sch5-Sch160.XXS ... 14-830*2-80Temperature-resistantseamless steel pipefar high-pressure boilerSeamless pipes for petroleum 20, 12CrMo,15CrMo, Cr5Mo, Cr9Mo GB9948-8810-530 ... *1.5-36Boiler pipes for refinery,heatexchangeing pipes,seamless steel pipes for pipelineHigh-pressureSeamless pipes for fertilizer making equipment20, 16Mn,Q345GB6479 ...