20CrMo steel plate has high hardenability, no temper brittleness, good weldability, little tendency of forming cold crack, good machinability and cold strain plasticity.
Mechanical properties of 20CrMo steel plate: the blank size of the sample is 15 mm. Tensile strength 0, >885 MPa; yield strength R, 2685 MPa; elongation 6, >12%; reduction of area >50%; impact energy a, >78j; impact toughness value a, >98 J /cm2; hardness <197 Hb, generally used in tempering or carburizing and quenching state, 20CrMo steel plate is used to manufacture high-pressure pipes, various fasteners and high-grade carburized parts, such as gears, shafts, fasteners, flanges, nuts, etc., which work in non corrosive medium and medium with working temperature lower than 250 ℃ and containing nitrogen hydrogen mixture.
The executive standard of 20CrMo steel plate is GB/T 3077-1999, corresponding to foreign standards: JSG4053: 2003; ASTM A29M: 2005; ISO 683-18:1996.
Chemical composition of 20CrMo steel plate (mass fraction,%): C content 0.17-0.24; Si 0.17-0.37; Mn 0.40-0.70; s < 0.035; P < 0.035; Cr 0.80-1.10; Mo 0.15-0.25; Ni 0.25; Cu < 0.3.
20CrMo steel plate heat treatment: quenching 880 ℃, water cooling, oil cooling; tempering 500 ℃, water cooling, oil cooling, low temperature tempering 150-200 ℃, hardness 32-33hrc. Delivery state of 20CrMo steel plate: delivered in heat treatment (normalizing, annealing or high temperature tempering) or non heat treatment state.
