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Q345b alloy round steel bar Alloy Seamless Steel Pipe 1cr5mo Aisi 1045 Hollow Steel Round Bar Nominal wall thickness: mm2.0, 2.5, 2.8, 3.2, 3.5, 3.8, 4.0, 4.5; Coefficients: c1.064, 1.051, 1.045, 1...