Biphase steel for wear-resisting screen mesh and heat treating technology

This invention provides a double phase steel for wear resisting screening net, It's chemical composition (wt.%) is: C-0.06@0.12% SI-1.51@2.1% Mn-0.25@0.5% P-0.05@0.15% S less than 0.035%, Mo-0.02@0.04%, La-0.020@0.005% Fe the remainder. The heat treatment procedure of said steel is that heat said stel to 850 deg.C@960 deg.C (double phose zone), keep for 4]8 minutes, then quench in a flowing water at room temp., cool to room temp. with a cooling rote 40@50deg.C/second. It can simplify the manufacturing technology, elliminate the environmental contamination due to lead bath treatment. It's average service life is 5 times more that of the carbon steel screens, and 2 times more than that of high-carbon spring steel net.