V-N微合金化Q460GJC钢板的研发

 为降低传统的Nb-V复合微合金化Q460建筑用钢板中的合金含量及生产成本，利用第3代TMCP技术和V-N微合金化技术，研制出单独V-N微合金化(wV=0.06%~0.08%)、不含铌的合金设计，并通过合理地控轧控冷工艺，在中厚板轧机上成功地生产出厚度40和50mm的V-N微合金化Q460GJC钢板。产品具有良好的综合性能，屈服强度大于470MPa，0℃冲击功超过150J，屈强比仅为80%。分析表明，细晶及析出强化对强度的贡献比例达到66%。

Development of V-N Microalloyed Q460GJC Steel Plates

For the purpose of reducing alloys additions and then its cost of conventionally combined Nb-V microalloyed Q460 grade steel plates for construction, an HSLA steel alloying design with only V-N microalloying of 0.06%-0.08% V and free of niobium, and corresponding thermal mechanical controlled process were facilitated by better understanding the third generation TMCP concept and V-N microalloying technology. These resulted in the success of commercializing final gauges of 40 and 50mm V-N microalloyed Q460GJC steel plates with good combination properties of high strength greater than 470MPa and improved toughness of AKV at 0℃ larger than 150J, and low YS/UST ratio of 80% as well. Theoretical calculation shows that the contribution by fined-grain and precipitate strengthening amount to about 66% of yield strength of the newly developed plate steels.