研究了低碳和超低碳两种成分500 MPa级高性能桥梁钢的成分设计及组织控制对性能的影响。连续冷却的实验表明，在相同冷却速度下, 碳的质量分数为0.08%的微合金钢比碳的质量分数为0.04%的微合金钢容易得到更多的板条贝氏体组织。碳的质量分数为004%的微合金钢在一定的冷却速度范围内（1~10 ℃/s）均可得到低碳贝氏体组织， 因此有利于大厚度钢板内部的组织均匀性。实验轧制结果显示，两种成分钢的屈服强度均能达到500 MPa，并且具有良好的伸长率和低温冲击韧性。20 mm厚钢板的断面组织均匀，为以粒状贝氏体和针状铁素体为主的低碳贝氏体组织。
The influence of composition and microstructure on the properties of 500 MPa grade high performance 0.08% and 0.04% carbon bridge steels were investigated. After continuous cooling, at same cooling speed in 0.08%C microalloyed steel, it is easier to form more lath bainite than in 0.04%C steel. In 0.04%C steel, cooled in the range of 110 ℃/s, the low carbon bainitic structure can be observed, which is helpful to uniformity of microstructure of steel plates. By the experimental thermamechanical control process (TMCP), two carbon steels have good elongation and impact performance at low temperature with the yield strengths up to 500 MPa. The crosssection microstructure of steel plate of 20 mm in thickness is uniform with granular bainite and acicular ferrite as main components.
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