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双辊薄带连铸技术自上世纪80年代至今已有近40年,但在常规不锈钢的工业化生产方面一直未取得成功。究其原因,主要归因于生产消耗、产品利润与产能之间的不匹配。近年来,国际国内开始将薄带连铸应用于制备节约型高强韧不锈钢,从而简化了热轧生产工艺,解决了因热塑性差而造成的钢板边裂和中裂等缺陷,大大提高了成材率。韩国浦项制铁采用薄带连铸技术生产出节约型双相不锈钢,耐腐蚀性能与SUS304奥氏体不锈钢相当,而抗拉强度可提高1倍,产品主要用于取代材料成本过高的奥氏体不锈钢。我国东北大学开发出高强韧节约型不锈钢的成分体系及其薄带连铸技术,制备出0.30~1.5mm厚薄带,其强塑积高达62 000 MPa·%且其耐腐蚀性能较SUS304高出10%~15%,可以应用于核电、石化、铁路交通及汽车结构等领域。本文就薄带连铸高强韧不锈钢的现状、应用及未来发展趋势进行了综述和分析。
Two-roll strip casting has been nearly 40 years since the 1980s, but has been unsuccessful in the industrial production of conventional stainless steel. The reason, mainly due to production consumption, product mismatch between profit and capacity. In recent years, the international and domestic began to use the strip casting continuous casting to save energy high toughness stainless steel, thus simplifying the hot-rolled production process, to solve the poor thermoplasticity caused by edge cracking and cracking and other defects, greatly improving the yield . South Korea Posco uses strip casting technology to produce economical duplex stainless steel, corrosion resistance and SUS304 austenitic stainless steel equivalent, while the tensile strength can be increased by 1 times, the product is mainly used to replace the material cost is too high Austrian Stainless steel body. China Northeastern University developed a high strength and toughness saving stainless steel component system and its strip casting technology to prepare a 0.30 ~ 1.5mm thick strip, the plastic material up to 62 000 MPa% and its corrosion resistance than SUS304 10 % ~ 15%, can be applied to nuclear power, petrochemical, railway traffic and automobile structure and other fields. This article summarizes and analyzes the status quo, application and future development trend of high strength and toughness stainless steel strip casting.