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采用不同的TMCP工艺,轧制了16mm厚的Q345建筑钢板材。对钢材的金相组织进行了观察,对抗拉强度和屈服强度进行了测试。结果表明,随着精轧温度区间向较低的轧制温度推移时,钢材F+P(铁素体+珠光体)组织明显细化,抗拉强度和屈服强度均逐渐升高,屈强比小幅增加;随着冷却速度的增加,组织由F+P逐渐向F+B(铁素体+贝氏体)转变,抗拉强度和屈服强度均逐渐升高,屈强比明显增加,特别是当冷却速度超过40℃/s时屈强比大幅提高;随着终冷温度的增加,F组织尺寸增大,P含量降低,抗拉强度和屈服强度均线性降低,屈强比也几乎呈线性降低的趋势。
Using a different TMCP process, a 16mm thick Q345 building steel sheet was rolled. The microstructure of the steel was observed, and the tensile strength and yield strength were tested. The results show that the microstructures of F + P (ferrite + pearlite) are obviously refined with the increase of the rolling temperature to the lower rolling temperature, and the tensile strength and yield strength increase gradually. The yield ratio Slightly increased. With the increase of cooling rate, the microstructures changed gradually from F + P to F + B (ferrite + bainite), the tensile strength and yield strength gradually increased, and the yield ratio increased obviously, especially When the cooling rate exceeds 40 ℃ / s, the yield ratio increases sharply. With the increase of the final cooling temperature, the size of the F structure increases, the content of P decreases, the tensile strength and yield strength decrease linearly, and the yield ratio is almost linear Decreasing trend.