Improve the hardenability of the steel, so that the steel has good strength by heat treatment, hardness and wear resistance. But the disadvantage is easy to cause the coarse grain, there is overheating sensitivity and temper brittleness.
On the effect of solid solution strengthening ferrite, can improve the yield strength of the steel. With appropriate silicon and manganese, but also the grain is slightly reduced manganese steel heat treatment of the growing tendency.
Improve hardenability, reduce the temper brittleness. Low temperature impact toughness of high manganese molybdenum and creep resistant ability.
The formation of carbides in the steel iron and carbon, and partially dissolved in solid solution, and to improve the high temperature performance of the.
Strong carbide forming elements, can improve the tempering temperature and stable organization, so that the steel has good abrasion resistance, ductility and thermal conductivity at high temperature. The main role of vanadium in grain refinement.
At low levels of grain refinement, improved toughness.
High strength low alloy steel by adding alloy elements, the relative carbon steel, mobility decreased slightly, the poor thermal conductivity, casting stress increases relatively, preferably in the annealing or normalizing after cutting the riser.