SPV235 steel can get rapid heating through different heating source.When SPV235 steel parts surface temperature is above the critical point (the SPV235 steel core temperature is below the critical point) it should be cooled rapidly. As a result, SPV235 got hardened steel surface layer and still keeping the original core tissue. In order to achieve the purpose of heating SPV235 steel surface only, all the heat source are demanded with high energy density.
According to the different heating methods, SPV235 steel surface can be divided into the induction heating quenching (high frequency, intermediate frequency and power frequency) surface hardening, flame heating surface hardening, electric contact heating surface hardening, electrolyte heating surface hardening, laser heating surface hardening, the electron beam surface hardening. induction heating methods and flame heating surface hardening methods are widely used in industrial.
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