CN114850423B - 一种中碳锰钢连铸大方坯角部裂纹的控制方法 - Google Patents
一种中碳锰钢连铸大方坯角部裂纹的控制方法 Download PDFInfo
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Abstract
一种中碳锰钢连铸大方坯角部裂纹的控制方法,钢的化学成分组成重量百分比为C=0.45%~0.49%,Si=0.17%~0.37%,Mn=1.40%~1.80%,P≤0.020%,S≤0.015%,Al≥0.010%,其余为Fe和不可避免的杂质;包括以下工艺步骤:连铸:采用大断面矩形坯350*430mm,采用结晶器大倒角R25mm,结晶器水量4000L/min,二冷比水量0.16L/kg,拉速0.6m/min,矫直温度≥950℃;铸坯堆冷:入垛温度≥700℃,堆冷时间大于24小时。本发明关键是铸坯在结晶器内超强冷、二冷区内弱冷快回温,使铸坯角部奥氏体晶粒细化,全面消除“奥氏体+晶界铁素体膜”低塑性结构,并且高温矫直、高温入垛,避开高温脆性区,解决了高锰钢大方坯铸坯角部裂纹的难题。
Description
技术领域
本发明属于冶金技术领域,涉及一种连铸大方坯角部裂纹的控制方法。
背景技术
经济建设对冶金技术提出了越来越多的要求,其中对连铸坯的表面质量要求也越来越高。连铸坯的表面质量问题主要是连铸坯裂纹问题,其中铸坯的角部裂纹尤为突出。因此,如何有效控制连铸坯角部裂纹缺陷的产生是炼钢连铸生产中重要的研究内容。
由于钢种特性,高锰钢大方坯角部裂纹频发,严重影响钢材质量。因此,对控制高锰钢连铸大方坯角部裂纹的生产技术研究具有重要意义。
发明内容
本发明的目的是提供一种中碳锰钢连铸大方坯角部裂纹的控制方法,解决中碳锰钢连铸大方坯角部裂纹问题。
本发明的技术方案:
一种中碳锰钢连铸大方坯角部裂纹的控制方法,钢种的化学成分组成重量百分比为C=0.45%~0.49%,Si=0.17%~0.37%,Mn=1.40%~1.80%,P≤0.020%,S≤0.015%,Al≥0.010%,其余为Fe和不可避免的杂质;包括以下工艺参数:
(1)连铸:采用大断面矩形坯350*430mm,采用结晶器大倒角R25mm,结晶器水量4000L/min,二冷比水量0.16L/kg,拉速0.6m/min,矫直温度≥950℃;
(2)铸坯堆冷:入垛温度≥700℃,堆冷时间大于24小时。
本发明的优点:大断面矩形坯采用高拉速+大倒角结晶器+结晶器大水量超强冷+二冷弱冷+铸坯堆冷,铸坯在结晶器内超强冷、二冷区内弱冷快回温,使铸坯角部奥氏体晶粒细化,全面消除“奥氏体+晶界铁素体膜”低塑性结构,并且高温矫直、高温入垛,避开高温脆性区,解决了中碳锰钢大方坯铸坯角部裂纹的难题。
附图说明
图1为实施例1铸坯角部组织图。
图2为实施例2铸坯角部组织图。
具体实施方式
下面结合实施例对本发明内容作进一步说明。
实施例1:
一种连铸大方坯角部裂纹的控制方法,铸坯规格350*430mm。钢的化学成分组成重量百分比为:碳:0.47%,硅:0.21%,锰:1.55%,磷:0.016%,硫:0.005%,Al:0.017%,其余为Fe和不可避免的杂质。关键工艺步骤包括
(1)连铸:矩形坯350*430mm,结晶器倒角R25mm,结晶器水量4000L/min,二冷比水量0.16L/kg,拉速0.6m/min,矫直温度962℃;
(2)铸坯堆冷:入垛温度713℃,堆冷时间27小时。
铸坯角部组织见图1。
实施例2:
一种连铸大方坯角部裂纹的控制方法,铸坯规格350*430mm。钢的化学成分组成重量百分比为:碳:0.48%,硅:0.23%,锰:1.57%,磷:0.013%,硫:0.004%,Al:0.016%,其余为Fe和不可避免的杂质。关键工艺步骤如下:
(1)连铸:矩形坯350*430mm,结晶器倒角R25mm,结晶器水量4000L/min,二冷比水量0.16L/kg,拉速0.6m/min,矫直温度968℃;
(2)铸坯堆冷:入垛温度720℃,堆冷时间32小时。
铸坯角部组织见图2。
Claims (1)
1.一种中碳锰钢连铸大方坯角部裂纹的控制方法,其特征在于:钢的化学成分组成重量百分比为C=0.45%~0.49%,Si=0.17%~0.37%,Mn=1.40%~1.80%,P≤0.020%,S≤0.015%,Al≥0.010%,其余为Fe和不可避免的杂质;包括以下工艺步骤:
(1)连铸:采用大断面矩形坯350*430mm,采用结晶器大倒角R25mm,结晶器水量4000L/min,二冷比水量0.16L/kg,拉速0.6m/min,矫直温度≥950℃;
(2)铸坯堆冷:入垛温度≥700℃,堆冷时间大于24小时。
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