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本文从冶金角度回顾了连续退火(CA)工艺的发展史,并介绍了应用该技术开发出的几种新产品及其生产原理。(1)1936年,Hague等人提出包括过时效处理的连续退火工艺技术。20世纪70年代日本钢铁企业引进并安装了该生产线,大批量地生产冷轧薄板。(2)运用连续退火快速冷却方法,生产高强度的双相钢。(3)运用连续退火快速冷却并进行过时效处理,用高温卷取的热轧卷生产低碳深冲钢(CQ和DQ)。(4)超低碳钢加Ti,Nb或Ti—Nb后进行连续退火,不需过时效处理,可生产CQ至EDDQ级薄钢板。(5)添加Nb的超低碳钢经高温连续退火处理,生产烤漆硬化超深冲钢。(6)从产品质量和生产方面看,可以预言连续退火工艺将会得到普遍发展。
This paper reviewed the history of the continuous annealing (CA) process from the metallurgical point of view, and introduced several new products and their production principles developed using this technology. (1) In 1936 Hague et al. Proposed a continuous annealing process that included over-aging. Japanese steelmakers introduced and installed the production line in the 1970s to produce cold-rolled sheets in large quantities. (2) The use of continuous annealing rapid cooling method, the production of high-strength dual-phase steel. (3) rapid cooling with continuous annealing and over-aging, and the production of low-carbon deep-drawn steel (CQ and DQ) from high-temperature coiled HRC. (4) After ultra-low carbon steel with Ti, Nb or Ti-Nb continuous annealing, without over-aging, can produce CQ to EDDQ grade steel. (5) adding Nb ultra-low carbon steel by high-temperature continuous annealing treatment, the production of paint hardening ultra-deep red steel. (6) In terms of product quality and production, it can be predicted that the continuous annealing process will be generally developed.