... Steel Pipeseamless steel pipe Is widely used in transportation of oil, natural gas, gas, water and some solid materials, pipes, etc ... in the manufacture structural parts and mechanical parts, such as oil drill pipe, automobile drive shaft, bicycle stand, as well as ... pressure boiler tube10#20#GB3087-199910-530×2-40(mm)Oil cracking tube2012CrMo 15CrMoGB9948-8810.530×1.5-36(mm)Chemical ...