探讨了４５钢低温渗硼层的组织与性能，结果表明，低温渗硼层通常呈针状，在渗硼层前沿没有如高温渗硼那样的晶粒粗大的伪共析或过共析组织的过渡区，而只有一个相对较窄的富碳区。低温渗硼层的耐磨性和耐蚀性较高温渗硼层有所提高，而其脆性却有所降低。在一定条件下会出现块粒状硼化物层，其耐磨性低于针状渗硼层，而其耐蚀性却优于针状渗硼层。 The microstructure and properties of low temperature boronizing layer of 45 steel were investigated. The results show that the low temperature boronizing layer is usually needle-like. There is no coarse pseudo-eutectoid or hypereutectoid structure in the front of boronizing layer Transition zone, but only a relatively narrow carbon-rich area. The wear resistance and corrosion resistance of the low temperature boronizing layer are higher than the high temperature boronizing layer, but its brittleness is reduced. Under certain conditions, there will be block granular boride layer, its wear resistance is lower than acicular boronized layer, and its corrosion resistance is better than acicular boronized layer.