The intercritical annealing-austenization-quenching-partitioning (I&Q&P ) heat treatment was conducted on low-carbon Si-Mn steel at different Mn partitioning temperatures, and then the effects of Mn partitioning temperature on the microstructure and mechanical properties of the steel were investigated.The results show that with the Mn partitioning temperature increasing,the martensite grains in the tested steel after I&Q&P treatment became larger,the lath became thicker and the lath spacing was widened;The elongation and retained austenite content both showed a changing trend of first increasing and then decreasing while the tensile strength decreased linearly.When the Mn partitioning temperature was 800 ℃,the comprehensive performance of the tested steel was the best with the product of strength and elongation over 29 046.65 MPa•%.%对低碳硅锰钢进行了不同锰配分温度下的双相区保温＋奥氏体化＋淬火碳配分(I&Q&P)热处理,研究了锰配分温度对该钢显微组织和力学性能的影响.结果表明：随着锰配分温度的升高,I&Q&P热处理后试验钢中马氏体晶粒变大,板条变粗,板条间距变宽；试验钢的伸长率和残余奥氏体含量均呈先增加后减小的变化趋势,抗拉强度则呈线性下降；当锰配分温度为800℃时,试验钢的综合性能最佳,强塑积可达29046．65 MPa•％.
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