... B); A106(B, C); A178... composition (%):Standard Steel grade CSiMnP≤S≤Cu≤Ni≤Cr≤GB/T 8162100. ... We can also provide customers with ERW pipe, steel pipe, line pipe, casing pipe, high pressure ... low pressure boiler pipe, structural and mechanical pipe, round pipe and tubing, suqare pipe, rectangular pipe, ... are also invited to Tianjn for business tour. Welded stainless steel tubes for machine structures