... 630*2-80Temperature-resistantseamless steel pipefar high-pressure boilerSeamless pipes for petroleum 20, 12CrMo,15CrMo, Cr5Mo, Cr9MoGB9948-8810-530 ... boiled pipe10,20GB3087-199910-530*2-40Over-heat pipe for low and medium pressure boiler,boilling water pipe, ... supply engineering, steam heating, hydroelectric power station and long pipeline transportation projects.3.ends: 2" below plain ends; 2 ...