Study on Compound Strengthening of 20 CrMnMo Steel
The compound strengthening and toughening of sub-critical quenching and cold-drawing deformation on 20CrMnMo steel was studied.The changing law of microstructure and properties during sub-critical quenching and cold-drawing deformation was analyzed. The results show that,after pre-quenching and 770℃sub-critical quenching followed by 200℃ low temperature tempering and 2.5%cold-drawing deformation and low temperature aging, the strength and plasticity of the steel match very well. The tensile strength is 1140 MPa, the elongation is 11.40% and the reduction of area is 51.26%.