利用Gleeble1500热模拟试验机，测试了45钢（w(S)=0016%）轧材、45钢（w(S)=006%）轧材及连铸坯的高温塑性。试验结果表明，在相同的温度下，低硫45钢轧材比高硫45钢轧材的高温塑性好，而高温强度基本相当；高硫45钢的连铸坯脆性转变温度区间为1100～1000 ℃，而连铸坯纵向比横向的高温塑性好，高温强度相当。扫描电镜分析结果表明，随着钢中硫含量的增加，在断口晶界上（Mn,Fe）S析出物数量有所增加，钢的高温塑性（断面收缩率）下降，降低了晶间的结合强度，对裂纹的敏感性增强。
Gleeble1500 was used to test the hot ductility of rolled mediumcarbon 45 steel bars from continuously cast billets with sulphur contents of 0.016% and 0.06% respectively. The results show that the hot ductility of low sulphur steel is higher than that of high sulphur steel but with similar hot strength; the ductilebrittle transition temperature zone of high sulphur steel is 1100~1000 ℃, and hot ductility in longitudinal direction is better than that in transverse direction. The results of SEMEDX indicate that the amount of precipitated particles of (Mn,Fe)S on grain boundary of fracture are increased with increasing sulphur content, while the bond strength between grains and the hot ductility RA value are reduced, and sensitivity to crack is increased.
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