微氮合金化螺纹钢的生产实践研究  

Study on trial production of nitrogen micro-alloyed reinforced bar

作　　者：邓深[1] 吴光亮[2] 覃强 袁勤攀 廖桓萱 杨跃标 

机构地区：[1]广西柳州钢铁(集团)公司,广西柳州545002 [2]中南大学钢铁冶金系,湖南长沙410083

出　　处：《炼钢》2014年第1期1-5,共5页Steelmaking

摘　　要：采用新型微氮合金化技术对HRB400E带肋钢筋进行生产试制研究，发现其钢坯在750-850℃存在热塑脆性区，通过控制连铸工艺可获得优质钢坯；钢筋成品具有较高抗拉强度和合适屈强比，时效性能稳定，其金相组织均以铁素体＋珠光体组成。研究表明，新型微氮钢筋的强度增加主要是由大小为5～30nm的第二相粒子析出强化作用引起的，可以使钢筋的合金钒用量节约40％～60％。采用该工艺生产的螺纹钢每吨钢的成本降低了40-60元，产生了显著的经济效益。The study on trial production of HRB400E using the new technique of nitrogen micro-alloying had been carried out. It was found that the billet had a thermoplastic brittle zone within the temperature range between 750 and 850 ℃. By controlling the continuous casting process, cast billet of high-quality had been successfully produced. The final rebar had high tensile strength and suitable yield ratio as well as stable aging performance, and metallurgical structure showed that it consisted of ferrite and pearlite. Further analysis revealed that the improvement in the strength of newly-developed N- microalloyed rebar was mainly due to the precipitation of secondary-phase particles with diameter from 5 to 30 nm. This new technique of nitrogen micro-alloying could save the usage of vanadium element by approximately 40 - to 60 %. It made the cost of steel per ton decrease 40-60 yuan and created obvious economic profits through adopting the production technology.

关 键 词：微氮合金化 螺纹钢 HRB400E 析出强化 

分 类 号：TF762.3[冶金工程—钢铁冶金]