A new spheroidizing process of ultra-high carbon steel(UHCS)containing C 1.55%,Cr 1.45%,and Al 1.5% in mass percent has been proposed.The effect of processing parameters on the microstructure was analyzed.The UHCS produced by this new process has a microstructure with recrystallized ferrite matrix and fine and uniform carbide particles.After this spheroidizing,the UHCS exhibits good mechanical properties at ambient temperature,for example sigma_b=1100 MPa,sigma_s= 915 MPa,delta=8% and high ratio of sigma_s/sigma_b.
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