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低碳低氮微合金钢通常表现出抗横向开裂性能,而碳含量较高的微合金钢则不然。讨论了碳含量质量分数为0.05%~0.6%的含钒微合金钢的热塑性研究和工业经验。在不同碳含量的情况下,只要[V][N]乘积不超过1×10-3,添加的钒就能降低钢对横向开裂的敏感性。铌和钒的结合增加了800~900℃临界矫直温度范围内的热塑性,这一改善得益于钒和铌复合加入减缓了动态析出过程。在含钛钢中,最初在高温下生成的Ti N具有促进Ti Nb(C,N)沉淀粗化和降低对塑性不利的细小Nb V(C,N)沉淀体积分数的额外作用。还介绍了TWIP钢热塑性的最新结果以及含钒微合金钢连铸的工业经验。
Low-carbon, low-nitrogen, micro-alloyed steels generally show resistance to transverse cracking, whereas micro-alloyed steels with a high carbon content are not. The thermoplastic properties and industrial experience of vanadium microalloyed steels with carbon content of 0.05% ~ 0.6% were discussed. With different carbon contents, the addition of vanadium reduces the susceptibility of steel to transverse cracking as long as the product of [V] [N] does not exceed 1 × 10 -3. The combination of niobium and vanadium increases the thermoplasticity within the critical straightening temperature range of 800-900 ° C. This improvement is due to the slowing down of the dynamic precipitation process by the addition of vanadium and niobium. In titanium-containing steels, the TiN initially formed at high temperatures has the additional effect of promoting TiNb (C, N) precipitation coarsening and reducing the volume fraction of fine Nb V (C, N) precipitates that are detrimental to ductility. The latest results of the TWIP steels’ thermoplastic properties as well as their industrial experience with continuous casting of vanadium microalloyed steel are also presented.