CN114737105B - 一种低硫铁水生产含硫钢的冶炼方法 - Google Patents
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Abstract
本发明公开了一种低硫铁水生产含硫钢的冶炼方法,步骤为:初炼炉(电炉/转炉)出钢过程中钢水进行铝脱氧,加入硫铁等合金进行合金化,配加石英砂、预熔精炼渣和石灰造低碱度炉渣;LF精炼过程进行渣面复合扩散脱氧操作。本发明通过出钢过程加硫铁提高钢水硫含量,解决铁水硫含量低带来的钢水初始硫含量低问题,同时采用铝强脱氧、造低碱度炉渣,LF精炼过程脱硫量<0.010%,保证钢水硫含量稳定。
Description
技术领域
本发明属于冶金领域,具体涉及一种低硫铁水生产含硫钢的冶炼方法。
背景技术
随着我国钢铁冶炼业的快速发展,开发了诸多含硫特殊钢,而目前针对含硫特殊钢的生产工艺技术,还处于摸索阶段,尤其是钢水中硫含量的控制技术不够成熟、稳定,生产质量和成本控制水平较差。
如专利CN201510358287公布的一种控制钢中硫含量的方法和专利CN201510158044公布的一种含硫钢的冶炼方法,选择高硫铁水,精炼生产过程喂硫线对钢水进行增硫、VD进行扒渣减少脱硫,这类生产方法工艺制定受铁水限制,精炼过程增硫又扒渣,影响生产操作和钢的纯净度。专利CN201510095647公布的一种含铝含硫系列齿轮钢冶炼工艺,生产过程先脱硫再增硫,生产成本增加,精炼后期增硫同样不利于钢水纯净度的控制。
发明内容
本发明的目的在于:针对初炼炉用的铁水硫含量不稳定,导致钢水初始硫含量不稳定,影响钢的纯净度,提供一种低硫铁水生产含硫钢的冶炼方法。
本发明所采取的技术方案是:
一种低硫铁水生产含硫钢的冶炼方法,包括以下步骤:
1)使用铁水和废钢作原料,采用初炼炉(电炉/转炉)冶炼,出钢过程中钢水进行脱氧,合金化,配加石英砂、预熔精炼渣和石灰造低碱度炉渣;所述铁水硫含量≤0.045%;
2)LF精炼过程进行渣面复合扩散脱氧,渣面扩散脱氧为,电石和碳化硅进行渣面扩散脱氧;
3)钢水精炼结束一是进行真空处理之后软吹,二是直接软吹。
本发明进一步改进方案是,所述步骤1)中,钢水铝脱氧为:出钢量为10t~30t时,根据钢水终点自由氧含量,加入1.1kg/t~1.7kg/t铝块脱氧。
本发明进一步改进方案是,所述步骤1)中,钢水合金化为:根据钢水初始硫含量,在出钢量为20t~40t时,配加硫铁合金,保证精炼到站w ([S])=成品目标值+0.010%~0.020%。
本发明进一步改进方案是,所述步骤1)中,使用石英砂、预熔精炼渣和石灰,出钢结束之前按照石英砂→预熔精炼渣→石灰顺序加入钢包中,用量按照1:2:4配比,石英砂用量1.2kg/t~2.4kg/t。
进一步的,LF进站炉渣成分(质量百分数):w(CaO)=45%~60%,w(SiO2)=8%~14%,w(MgO)=4%~9%、w(Al2O3)= 20%~30%,炉渣二元碱度R=3~6。
本发明进一步改进方案是,所述步骤2)中,渣面扩散脱氧为,电石和碳化硅进行渣面扩散脱氧:碳化硅用量0.6kg/t~1.8kg/t,碳化硅和电石用量比为2:1~3:1。
进一步的,控制精炼渣终渣w(CaO)=40%~55%,w(SiO2)=10%~17%,w(MgO)=5%~11%、w(Al2O3)= 22%~35%,炉渣二元碱度R=2~5。
本发明的有益效果在于:
第一、本发明的一种低硫铁水生产含硫钢的冶炼方法,通过出钢过程增硫,使得钢水中的硫含量更加均匀,钢水中硫的均质化,有利于铸坯中硫化物的分数均匀。
第二、本发明的一种低硫铁水生产含硫钢的冶炼方法,避免钢水精炼过程增硫,杜绝喂入大量硫线造成钢水的二次污染,以及挥发出的硫磺造成环境污染。
第三、本发明的一种低硫铁水生产含硫钢的冶炼方法,通过使用石英砂造低碱度炉渣,转炉使用铝进行单一的强脱氧,同时LF精炼使用碳化硅和电石脱氧,保证钢水有效脱氧去夹杂物的同时,保持炉渣的低硫容量,降低钢水硫的损失,LF精炼过程脱硫量<0.010%,使得钢水中硫含量保持稳定,精炼后期钢水不加硫合金。
具体实施方式
实施例1
采用本方法冶炼SAE1117,化学成分质量百分比为:C 0.15%~0.22%、Si 0.15%~0.45%、Mn1.10%~1.55 %、Cr ≤0.40%、Al ≤0.040%、P≤0.020%、S 0.080%~0.130%、Ni≤0.20%、Cu≤0.20%、V≤0.20%、Ti≤0.030%,其余为Fe。其具体包括以下步骤:
1)铁水硫含量0.025%~0.040%,初炼炉冶炼,钢水终点w([S])=0.015%~0.035%。出钢量为10t~30t时,根据钢水终点自由氧含量,加入1.1kg/t~1.7kg/t铝块脱氧;在出钢量为20t~40t时,配加硫铁合金2.0kg/t~4.0kg/t,精炼到站w ([S])=0.100%~0.120%。
出钢结束之前按照石英砂→预熔精炼渣→石灰顺序加入钢包中,用量按照1:2:4配比,石英砂用量1.8kg/t~2.0kg/t。
LF进站炉渣成分(质量百分数):w(CaO)=45%~50%,w(SiO2)=12%~14%,w(MgO)=4%~9%、w(Al2O3)= 20%~25%,炉渣二元碱度R=3~4。
2)LF精炼过程进行渣面复合扩散脱氧。渣面扩散脱氧为,电石和碳化硅进行渣面扩散脱氧,碳化硅用量1.1kg/t~1.8kg/t,碳化硅和电石用量比为3:1。精炼渣终渣w(CaO)=40%~55%,w(SiO2)=13%~17%,w(MgO)=5%~11%、w(Al2O3)= 22%~25%,炉渣二元碱度R=2~3。
3)钢水精炼结束后进行真空处理,之后软吹。其余实施如该钢种的常规方法。
通过步骤1)~步骤3)所得的钢,A类硫化物2.5~3.0级、B类氧化物0~0.5级、C类氧化物0级、D类氧化物0.5~1.0级、DS类0~0.5级。
实施例1对比例
铁水硫含量0.025%~0.040%,初炼炉冶炼,钢水终点w([S])=0.015%~0.035%。出钢过程加脱氧剂、合金、渣料。
LF进站炉渣二元碱度R=7~9。LF精炼过程进行脱氧、合金化。精炼渣终渣二元碱度R=7~11。LF出站钢水硫含量<0.012%,钢水精炼结束后进行真空处理,破空后分2~3次喂入硫磺线共500m~700m,之后软吹。
A类硫化物3.5~4.5级、B类氧化物0.5~1.0级、C类氧化物0级、D类氧化物1.5级、DS类1.0~2.0级。
实施例2
采用本方法冶炼C38N2+BY,化学成分质量百分比为:C 0.32%~0.42%、Si 0.40%~0.70%、Mn1.20%~1.70 %、Cr 0.05%~0.25%、Al ≤0.025%、P≤0.025%、S 0.045%~0.070%、Ni≤0.20%、Cu≤0.20%、V 0.02%~0.10%、Ti 0.005%~0.035%,其余为Fe。其具体包括以下步骤:
1)铁水硫含量0.020%~0.035%,初炼炉冶炼,钢水终点w([S])=0.015%~0.030%。出钢量为10t~30t时,根据钢水终点自由氧含量,加入1.1kg/t~1.7kg/t铝块脱氧;在出钢量为20t~40t时,配加硫铁合金0.85kg/t~2.5kg/t,精炼到站w ([S])=0.060%~0.075%;
出钢结束之前按照石英砂→预熔精炼渣→石灰顺序加入钢包中,用量按照1:2:4配比,石英砂用量1.2kg/t~1.5kg/t。
LF进站炉渣成分(质量百分数):w(CaO)=48%~53%,w(SiO2)=9%~12%,w(MgO)=5%~8%、w(Al2O3)= 22%~27%,炉渣二元碱度R=4~6。
2)LF精炼过程进行渣面复合扩散脱氧。渣面扩散脱氧为,电石和碳化硅进行渣面扩散脱氧,碳化硅用量0.6kg/t~1.3kg/t,碳化硅和电石用量比为2:1。精炼渣终渣w(CaO)=50%~55%,w(SiO2)=12%~15%,w(MgO)=6%~10%、w(Al2O3)= 25%~33%,炉渣二元碱度R=3~5。
3)钢水精炼结束后进行真空处理,之后软吹。其余实施如该钢种的常规方法。
通过步骤1)~步骤3)所得的钢,A类硫化物2.0~2.5级、B类氧化物0.5级、C类氧化物0级、D类氧化物0.5级、DS类0~0.5级。
实施例2对比例
铁水硫含量0.020%~0.035%,初炼炉冶炼,钢水终点w([S])=0.015%~0.030%。出钢过程加脱氧剂、合金、渣料。
LF进站炉渣二元碱度R=7~9。LF精炼过程进行脱氧、合金化。精炼渣终渣二元碱度R=7~11。LF出站钢水硫含量<0.010%,钢水精炼结束后进行真空处理,破空后分1~2次喂入硫磺线共300m~500m,之后软吹。
A类硫化物3.0~4.0级、B类氧化物1.0~1.5级、C类氧化物0级、D类氧化物1.5级、DS类1.0~2.5级。
Claims (3)
1.一种低硫铁水生产含硫钢的冶炼方法,其特征在于包括以下步骤:
1)使用铁水和废钢作原料,采用初炼炉冶炼,出钢过程中钢水进行脱氧、合金化,配加石英砂、预熔精炼渣和石灰造低碱度炉渣,出钢结束之前按照石英砂→预熔精炼渣→ 石灰顺序加入钢包中,用量按照1:2:4配比,石英砂用量1 .2kg/t~2.4kg/t;
所述铁水硫含量≤0.045%;
钢水铝脱氧为:出钢量为10t~30t时,根据钢水终点自由氧含量,加入1 .1kg/t~1.7kg/t铝块脱氧;
钢水合金化为:根据钢水初始硫含量,在出钢量为20t~40t时,配加硫铁合金,保证精炼到站w ([S])=成品目标值+0.010%~0.020%;
2)LF精炼过程用电石和碳化硅进行渣面扩散脱氧;
3)钢水精炼结束:一是进行真空处理之后软吹,二是直接软吹,
LF进站炉渣成分:w (CaO)=45%~60%,w (SiO2)=8%~14%,w (MgO)=4%~9%、w (Al2O3)=20%~30%,炉渣二元碱度R=3~6。
2.如权利要求1所述的一种低硫铁水生产含硫钢的冶炼方法,其特征在于:所述步骤2)中,电石和碳化硅进行渣面扩散脱氧:碳化硅用量0 .6kg/t~1 .8kg/t,碳化硅和电石用量比为2:1~3:1。
3. 如权利要求2所述的一种低硫铁水生产含硫钢的冶炼方法,其特征在于:控制精炼渣终渣w (CaO)=40%~55%,w (SiO2)=10%~17%,w (MgO)=5%~11%、w (Al2O3)= 22%~35%,炉渣二元碱度R=2~5。
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