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为了提高钢筋的综合机械性能,充分利用钢材的潜在强度,最近经上海冶金局、上钢三厂、新沪钢厂、钢铁研究所等单位和我局有关单位的通力合作试验,对原Ⅱ级20MnSi钢筋自φ12～32大小不同规格的螺纹钢筋,采用钢筋轧后余热处理的新工艺,大大提高了钢筋的机械性能,各项指标均符合设计、施工、使用要求,因而是很有发展前途的钢材之一。过去,在提高钢筋强度级别的生产中,通常是采用合金强化,冷加工强化,常规热处理强化等手段,其效果虽然都较显著,但伴随而来的,不是钢的韧性和塑性的下降,就是生产工艺繁复,成本提高。为此,国内外一些钢厂就研制采用了轧后余热处理的新工艺以提高钢材的综合机械性能(主要是强度和韧性),简化工艺,节约能耗,减少钢
In order to improve the comprehensive mechanical properties of steel bars and make full use of the potential strength of steel, recently through the joint efforts of Shanghai Metallurgical Bureau, Shanghai No. 3 Steel Works, Xinhu Steel Works, Steel Research Institute and other relevant units of the Bureau, the original level II 20MnSi steel bar from φ12 ~ 32 size of the different specifications of the rebar, the use of residual heat treatment after the new process of rolling, greatly improving the mechanical properties of the bar, the indicators are in line with the design, construction, use requirements, which is very promising One of the steel. In the past, in the production of steel bar strength grades, alloy strengthening, cold working strengthening, and conventional heat treatment strengthening methods were commonly used. Although the effects were all significant, the decline in toughness and plasticity of steel was not the same as production. The process is complicated and costs increase. To this end, some domestic and foreign steel mills have developed a new process of after-heat treatment after rolling to improve the overall mechanical properties of the steel (mainly strength and toughness), simplify the process, save energy, and reduce steel