The role of trace metal elements in steel:

9, aluminum (Al): (1) 0.5 ~ 1% of Al in low-carbon structural steel contribute to increase the hardness and strength of the steel; (2) Al-containing chromium and molybdenum steel and chromium steel can increase its wear resistance; (3) The presence of Al in high carbon tool steels can produce quench brittleness.

10, tungsten (W): can increase the creep strength of steel, but also a strong promoter of carbides in steel, each 1% W can increase the tensile strength and yield point of the steel 4×9.8N/cm² , And make it have temper stability and high temperature strength.

11, molybdenum (Mo): can increase the strength of the steel without reducing the plasticity and toughness of the steel, while enabling the steel at high temperatures with sufficient strength, can improve the steel's cold brittleness and wear resistance.

12. Cobalt (Co): It can improve and improve the high temperature performance of steel, increase its red hardness, and improve the oxidation resistance and corrosion resistance of steel.