... , 40mm, 42.4mm, 42.7mm, 48mm, 50.8mm, 54mm, 57mm, 58mm, 60mm, 62mm, 63mm, 63.5mm, 68mm, 70mm, 73mm, 76.2mm ... , heat treatment, NDT Chemical Composition of Material MaterialComposition201202304316430C≤0.15≤0.15≤0.08≤0.08≤0.12Si≤1.00≤1.00≤1.00≤1 ... ≤2.00≤2.00≤1.00P≤0.06≤0.06≤0.045≤0.045≤0.040S≤0.03≤0.03≤0.030≤0.030≤0.030Cr16-1817-1918-2016-1816 ...