1.side door steel bar 2.material:65Mn 3.Hardness: HRC38-45 4.high quality 5.good toughness and hardness Our steel sheets/ plates are made by continuous vacuum quenching which is the most domestic processing technique. With uniform hardness and no deformation in quenching, steel sheets/ plates maintain their strength and toughness, have high wear resistance, high toughness, high flatness, proper ...