HR SA709Gr50W high strength steel is famous for its property in atmosphere corrosion resistance. SA709 Grade 50W steel plates are widely used in construction machinery, mining machinery, truck, bridges, pressure vessels, etc., structures building.
Product specification SA709Gr50W high-strength low-alloy steel range: thickness 8-650mm, width 1500-4020mm, length 3000-18800mm
The characteristic of niobium in SA709 Gr 50W steel material is to increase the recrystallization temperature of austenite, so as to achieve the purpose of refining austenite grains. In general, the amount of niobium added in steel material is less than 0.05%, and the contribution of niobium above 0.05% to strengthening and toughening will no longer be obvious.
Tempering includes high temperature tempering, medium temperature tempering and low temperature tempering. Tempering means to reheat the SA709Gr50W high-strength low-alloy steel quenched steel to a certain temperature and then cool it in a certain way. Tempering can reduce or eliminate the internal stress produced by quenching, reduce the hardness and strength, and improve the ductility or toughness of steel.
After SA709Gr50W low alloy steel quenching, the workpiece should be tempered in time, and the required mechanical properties can be obtained through the combination of quenching and tempering.