Industrial production process of unquenched steel front axle for heavy automobile

In view of the disadvantage of mechanical properties decrease and high cost of truck front axle caused by using quenched and tempered steel, a non-quenched and tempered steel trucks front axle was designed by using of cheap substitute, such as Mn, Si alloy elements instead of Cr, Ni, Mo and other more expensive al-loying elements. The air-cooled bainitic steel components were designed as Mn-Si-V-B steel and the No. was 18Mn2SiVB. Through smelting operations, heat treatment of front axle was determined by test and industrial ex-periment was carried out. The product was tested by phase fatigue analysis and experimental. The results show that the basic conditions of smelting and casting and rolling can meet the designed requirements of 18Mn2SiVB steel production. 18Mn2SiVB instead of 45# steel, 40CrMo or 40CrNiMo to manufacture trucks front axle can satisfy the use requirements from the mechanical test results; in the manufacturing process, using air cooling in-stead of quenched and tempered after forging is feasible.