A low-cost low alloy medium-carbon steel was produced,and its mechanical properties were investigated.The low-cycle fatigue behavior of the tested steel was investigated by controlling the total strain amplitude.The results show that the tested steel salt bath quenched at 302 ℃ for 2 h has a relatively high tensile strength of 957 MPa.As the salt bath quenching temperature increases to 312 ℃,the tensile strength decreases,but the U-notched impact property increases,with the salt bath temperature further increasing,the impact property is reduced.The increase of salt bath holding time results in the decrease of hardness of the tested steel.Under high strain amplitude(0.80％),the initial hardening rate of the steel salt bath quenched at 312 ℃ is lower,while the tested steel with higher strength martensite salt bath quenched at 302 ℃ has higher low-cycle fatigue strength and fatigue life.
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