铌元素对超低碳IF钢性能的影响
Effect of Nb Element on Properties of Ultra-low-carbon IF Steel
潘利波, 魏 星, 胡吟萍
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作者单位：(武汉钢铁(集团)公司研究院, 湖北 武汉 430080)
中文关键字：铌； 超低碳IF钢； 性能； Δr值
英文关键字：Nb; ULC-IF steel; properties; Δr value
中文摘要：通过对同等生产条件下的Ti-IF钢和Ti+Nb-IF钢冷轧后试样进行不同温度的连续退火试验，检测其金相组织与力学性能，分析了Nb元素对超低碳IF钢性能的影响。结果表明：在超低碳IF钢中，Nb元素的加入显著提高了再结晶温度，由于其细化晶粒的作用，使IF钢的强度得到提高，且对产品的后续焊接性能起着重要作用，另外，Nb元素可以大大减小IF钢的平面各向异性，保证优异深冲性能的同时降低Δr值。
英文摘要：The annealing experiment at different temperature was made on the cold rolled Ti-IF steel and Ti + Nb-IF steel samples manufactured under the same process conditions. The microstructure and mechanical properties were tested, and the effects of Nb element on the properties of ultra-low-carbon IF steel were analyzed. The experiment results indicate that adding Nb evidently improves the re-crystallization temperature of ultra-low-carbon IF steel. And the strength of IF steel increases because Nb makes grain finer, which also plays a great role in the welding properties. In addition, the plane anisotropy and Δr greatly decreases by adding Nb under the premises of ensuring the excellent deep drawing properties.