Spring steel heat treatment method

Heat treatment characteristics of spring steel heat treatment depends on the processing of forming method, spring can be divided into ordinary hot forming spring and cold forming spring two broad categories: 1) Hot forming spring of section size> 10 mm all kinds of large and complex shape spring adopt hot forming ( Such as hot rolling, hot roll) , such as cars, tractors, train plate spring and spring. Its concise road for processing: flat or round steel blanking to heating bending or winding, shot peening treatment of quenching medium temperature tempering -> appearance, using the state organization for tempering austenite. Shot peening can strengthen spring appearance quality, appearance and progress to improve the fatigue performance significantly. 2) Spring cold forming sectional dimension of < 10 mm small spring can use cold forming ( Such as cold rolled, cold rolled) , such as the instrument of the spiral spring, spring and spring leaf, etc. This kind of spring stop cold drawn before forming ( Cold rolled) Isothermal quenching, quenching medium temperature tempering or lead bath after cold drawing ( Rolling) Strengthening; Then stop cold forming, this process will further strengthen the metal, but also produce a large internal stress and brittleness, so should stop after low temperature annealing ( General 200 ~ 400 ℃)