... 2-80Temperature-resistantseamless steel pipefar high-pressure boilerSeamless pipes for petroleum 20, 12CrMo,15CrMo, Cr5Mo, Cr9MoGB9948-8810- ... 1.5-36Boiler pipes for refinery,heatexchangeing pipes,seamless steel pipes for pipelineHigh-pressureSeamless pipes for fertilizer making equipment20, 16Mn, ... pipe10,20GB3087-199910-530*2-40Over-heat pipe for low and medium pressure boiler,boilling water pipe ...