为了避免和减轻SS400含硼钢连铸坯表面裂纹，采用Gleeble-1500热模拟试验机对SS400含硼钢连铸坯的高温力学性能进行了测试，获得其在650～1350℃范围内热延塑性和高温强度的特性。试验结果表明，SS400含硼钢连铸坯的高温强度较低，且其高温强度随温度的升高而下降。SS400含硼钢的塑性区间仅在1000～1100℃温度范围内，该温度范围内试样的断面收缩率均大于90%；SS400含硼钢的低塑性区间较宽，第Ⅲ脆性温度区间为700～950℃，主要原因是硼在晶界的偏聚以及BN等第二相粒子在晶界析出后脆化晶界；局部区域的重熔也降低了SS400含硼钢在1150～1250℃温度区间内的塑性。
In order to avoid and reduce surface cracks of SS400 B-bearing steel slab,the high temperature mechanical properties of SS400 B-bearing steel slab have been investigated in the temperature range of 650-1 350℃by the hot ten-sile test technique with Gleeble-1500 system. The results showed that its yield strength and tensile strength in the tempera-ture range were relatively small;in general,which decreased with increased tested temperature. Only in the range of 1000-1 100℃,SS400 B-bearing steel slab has good hot ductility and the reductions of area were higher than 90%. The third brittle zone of the SS400 B-bearing steel is between 700-950℃. The low plasticity temperature range is relatively wide, because of boron segregation in grain boundaries and precipitation of BN leading to the grain boundary embrittlement. Be-cause of the remelting phenomenon of B-bearing steel,the plasticity can be reduced when the temperature lies between 1 150-1 250℃.
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