A106-B cold rolled precision seamless steel pipe grade: A179, A106-B, 40Cr, 37Mn5, 20Cr; ... Standard: DIN 2391, GB/T 3639; Cold Rolled Precision Seamless Steel PipeSteel grade: 10#, 20#, 35#, 45#, 40Cr, 37Mn5 ... of automobile, absorber, and hydraulic pressure facility etc cold rolled precision seamless steel pipe