Production Practice of Process Optimization of 780 MPa Cold Rolled Dual Phase Steel
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摘要: 为了获得冷轧双相高强钢DP780稳定优良的力学性能, 在多次生产实践中进行工艺优化, 具体包括针对C、Si、Nb、Ti、Cr等化学元素和热轧卷取温度进行调整, 利用光学显微镜和拉伸性能检验设备, 分析了DP780的热轧、冷轧金相组织和性能检验结果。结果表明, 冷轧双相钢DP780采用0.12%C、0.39%Si及0.25%0.60% (Nb+Cr) 的化学成分合理匹配和低于660℃的卷取温度, 可以获得理想的组织比例和力学性能指标, 屈强比和强塑积也能达到最佳值, 最大强塑积达到18 318 MPa·%。Abstract: In order to obtain excellent mechanical property of 780 MPa cold rolled dual phase steel,process optimization had been done including adjusting the chemical elements C、Si、Nb、Ti、Cr and coiling temperature.And the microstructure observation and mechanical properties measurement of hot and cold rolling strip had been performed.It is found out that alloying design of 0.12%C+0.39%Si+0.25% ~0.60% Nb+Cr and suitable coiling temperature below 660 ℃ can generate desired microstructure and mechanical properties.And optimal ratio of yield to tensile strength and the product of tensile strength and elongation of 18 318 MPa·% had been achieved.
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Key words:
- dual phase steel /
- chemical composition /
- coiling temperature /
- microstructure /
- mechanical properties
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