炼钢工序增氮情况试验分析

Experimental analysis of nitrogen increasing in steelmaking process

一般情况下在低碳钢中,氮以氮化物形式存在。对于低碳钢而言,它是一种有害元素。氮能降低钢的塑性、韧性、焊接性,增加钢的强度。通过不同环节,不同工艺(主要是转炉底吹、出钢过程、钢包底吹、保护浇注等方面)间横纵向对比,分析氮含量变化规律。发现转炉底吹气体、钢包吹气、大包保护浇注、中间包保护浇注等是炼钢工序主要增氮环节,严守工艺要点和工艺操作规程,避免不合格品出现。

In low carbon steels, nitrogen exists in the form of nitrides. For low carbon steel, it is a harmful element. Nitrogen can reduce the plasticity, toughness, weldability and increase the strength of steel. Through different links, different processes （mainly of converter bottom blowing and discharging process, ladle bottom blowing, protective casting etc.） between horizontal and vertical contrast, analyzed the variation of nitrogen content. Found converter bottom blowing gas, ladle, ladle blowing protection casting, tundish casting steelmaking is the main protection of nitrogen links, key processes and strict process procedures, to avoid the unqualified products.