A kind of low alloy steel was designed by adopting the orthogonal method whose main compositions were silicon and manganese elements. In order to improve the hardening ability of low alloy steel, a small amount of chromium and boron elements were added. Moreover, a small amount of rare earth and titanium elements were used to modify the microstructure. Under the condition of the air cooling the structure of this steel is bainite and its tensile strength, hardness, impact and fracture toughness excel 2000 MPa, 55 HRC, 30 J/cm and 70 MPa·m1/2 respectively. In the pin abrasion and impact ab...
