The results indicate that ultra-fine spheroidized carbides were formed by complete austenizing with high temperature tempering, and ultra-fine martensite or pearlite could be formed when the steel was then heated to lower austenizing temperature and quenched or normalized. 试验表明,该钢完全奥氏体化淬火后通过高温回火得到大量超细球状碳化物,然后在低温奥氏体化进行二次淬火和正火,获得超细马氏体、珠光体。