Cold deformation of the plastic medium cutting and welding is acceptable, but before welding the parts preheat to above 200 ℃. Drawing, good for cold heading and heat treatment process performance, high hardenability in oil critical hardenability diameter 6.5 ~ 18mm quenching deformation is small, but there is overheating, decarburization sensitivity and temper brittleness. This steel after quenching and tempering of a high strength, toughness and abrasion resistance, static strength and fatigue strength are good.