硼微合金化中碳钢生产试验研究  

Experimental study on production of boron micro-alloying medium carbon steel

作　　者：彭胜[1] 彭其春[1] 范丹萍[1] 周春泉[2] 彭明耀[2] 周明伟[2] 

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点试验室,湖北武汉430081 [2]湖南华菱涟源钢铁有限公司,湖南娄底417009

出　　处：《炼钢》2014年第1期34-37,50,共5页Steelmaking

摘　　要：通过对湖南华菱涟源钢铁有限公司转炉一连铸流程生产中碳钢进行硼微合金化工艺的开发研究，揭示了硼微合金化的力学特征和机制。结果表明：微量的硼使钢的晶粒明显粗化，显著降低钢的屈服强度；硼对保护渣影响很小，无需针对中碳含硼钢设计特殊保护渣；将精炼过程控制△w（N）〈10×10^-6，加入锰铁、硅铁脱氧，在钙处理前3min加入钛铁固氮，钙处理前1min喂入硼线，可以保证硼稳定的收得率同时达到硼微合金化的效果，平均收得率达到78．8％；中碳钢A36-LB的第Ⅲ脆性温度区域在700-900℃，为避免角部裂纹的发生，需相应减少铸坯边部水量和总水量。Mechanics characteristic and the mechanism of boron microalloying were revealed through the development and research of boron microalloyed medium carbon steel production process in Lianyuan Iron ＆ Steel Co. converter→continuous casting process. The results showed that trace amounts of boron made grain coarsening behavior obviously, significantly reduced the yield strength of steel. It was not necessary to design special mold powder for boron microalloyed medium carbon steel, because boron had little effect on mold powder. The stable yielding rate of boron could be obtained through controlling Aw（N）〈10×10^-6, using ferromanganese, ferrosilicon to deoxi- dize, adding ferrotitanium at 3 minutes before calcium treatment, feeding boron line at 1 minutes before the calcium treatment in the process of refining, and the average yield was 78.8 %. First III brittleness temperature region of medium carbon steel A36-LB was among 700 - 900 ℃, the emergence of corner crack could be avoided through reducing of slab edge water and total water amount.

关 键 词：A36-LB钢 硼微合金化 屈服强度 保护渣 脆性温度 

分 类 号：TF761.3[冶金工程—钢铁冶金]