CN108396104A - 一种减少水口堵蓄提高轧板表面质量的冶炼方法 - Google Patents
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
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- B22D11/116—Refining the metal
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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Abstract
本发明公开一种减少水口堵蓄提高轧板表面质量的冶炼方法,钢液进入RH加Al预脱氧,使钢液中氧保持在0.004%~0.02wt%;尔后向钢液中加入Ti:0.01~0.4wt%,La+Ce:0.001~0.01wt%;根据实测中包内钢水全氧含量,计算出钢水增氧量,向中包内加入钢液增氧量0.2~1.2倍的La、Ce,形成尺寸更小,形貌近圆形的几种元素的复合夹杂物。本发明工艺简单,实施难度低,简单易行,通过夹杂物改性,能够减少中包水口堵蓄,增加中包连浇次数;生成尺寸细小、分布均匀的近球形夹杂物,减少轧板表面缺陷。
Description
技术领域
本发明属于冶炼工艺技术领域,特别涉及一种可减少水口堵蓄,提高轧板表面质量的冶炼方法。
背景技术
铝脱氧技术已经广泛应用于炼钢过程,非金属夹杂物氧化铝就此在钢液中生成,通过聚集上浮,有一大部分能够排除钢液,但仍有少部分氧化铝残留于钢液中,形成脆性夹杂物。氧化铝的残留是有害的,首先容易在连铸过程中聚集在水口,形成堵蓄,造成浇铸的不连续;另外残留于铸坯中的氧化铝夹杂是造成钢板表面质量缺陷的重要原因,因此,关于氧化铝的去除和改性工作一直是人们研究的重点,加铝时间、次数、质量、钢水镇静时间等等影响氧化铝生成和上浮的因素都被人们仔细研究,形成了比较成熟的有利于氧化铝去除的工业技术,并已经应用到实际生产中。
文献“X70管线钢钙处理研究”(《钢铁》,2010年第2期),通过工业试验表明钙处理前管线钢的夹杂物主要是絮状的Al2O3夹杂,尺寸较大,喂硅钙线后立即取样,钢中夹杂物发生了显著变化,绝大部分转化为CaO-CaS-A12O3夹杂,夹杂尺寸细小,形状接近球形。通过钙处理可以实现将絮状Al2O3夹杂变性为球状低熔点CaO-A12O3夹杂,减轻铸坯轧制成板材过程中Al2O3附近出现的细小裂纹或应力集中,防止连铸生产中出现絮流现象。控制夹杂物为熔点低于钢水温度的CaO-A12O3夹杂,此时夹杂物中nCaO/Al2O3应接近12CaO·7A12O3的比例,以保证夹杂的熔点较低。管线钢夹杂物变性还可以通过控制精炼后期和连铸过程中钢中夹杂物为液态夹杂,促进夹杂物的聚合长大和上浮去除;文献“板坯铸机水口堵塞的原因分析与改进”(《钢铁研究学报》,2015年第1期),总结生产经验发现,精炼工序用铝脱氧后在钢中形成大量的Al2O3,在浇铸时很容易粘附在水口壁上,絮状积聚造成水口堵塞浇铸中断,在精炼工序(LF炉或CAS工艺)通过对钢中喂钙线,形成易于上浮的低熔点夹杂物(铝酸钙),通过软吹氩工艺促进夹杂上浮、提高钢液的浇铸性能,但是铝与钙加入量、加入时机控制不当,极易形成其它高熔点复合夹杂,吹氩时间短及效果差,夹杂难以上浮,造成水口堵塞严重,成本升高的同时恶化了钢水质量。文献“特殊钢中稀土变质夹杂物行为研究”(《中国稀土学报》,2010年第5期),文中从理论和实验上分析了加入稀土对A12O3夹杂物改变的影响,研究表明稀土与A12O3可以形成硬度较低的REAlO3夹杂,从而减少A12O3的危害。
综合上述,钙处理改性A12O3夹杂物的研究较为普遍和成熟,稀土改性A12O3夹杂物的研究多侧重于理论和实验室研究,如果能够应用到工业生产中必将产生显著影响,因此值得深入调研。
发明内容
本发明的目的旨在通过夹杂物改性,减少中包水口堵蓄,增加中包连浇次数,生成尺寸细小、分布均匀的近球形夹杂物,减少轧板表面缺陷。
为此,本发明所采取的技术解决方案是:
一种减少水口堵蓄提高轧板表面质量的冶炼方法,其特征在于,冶炼工艺为BOF-LF-RH-CC,其具体方法和步骤为:
(1)转炉和LF冶炼后化学成分wt%满足:C:0~0.05%,Si:0~0.01%,Mn:0~0.5%,P:0~0.05%,S:0~0.02%;
(2)钢液进入RH后,向钢液中加Al进行预脱氧,使钢液中氧保持在0.004%~0.02wt%范围内;
(3)尔后向钢液中加入Ti、La、Ce,加入量为:Ti:0.01~0.4wt%,La+Ce:0.001~0.01wt%,所生成的复合夹杂物中(La2O3+Ce2O3)/TiO2比值在0.1~0.7范围内,对钢液进行取样测全氧含量;
(4)将满足上述条件的钢水浇注到中包内,并对中包内钢水进行取样测全氧含量,计算出钢水在中包内的增氧量;然后向中包内加入La、Ce金属或两者的混合物,加入量为中包内钢液增氧量的0.2~1.2倍;
(5)将上述钢水浇铸成铸坯。
本发明通过控制钢种成分,向钢中加入Ti、La、Ce,从而形成几种元素的复合夹杂物,而这些复合夹杂物相对比氧化铝夹杂,尺寸更小,形貌近圆形,复合夹杂物的形成降低了夹杂物与钢液的界面能,从而使夹杂物更容易稳定存在钢液中,抑制了夹杂物的聚集,从而减少氧化铝夹杂物危害。因此,本发明的积极效果为:
1、通过夹杂物改性,能够减少中包水口堵蓄,增加中包连浇次数;
2、生成尺寸细小、分布均匀的近球形夹杂物,减少了轧板表面缺陷;
3、工艺简单,实施难度低,简单易行。
具体实施方式
实施例1:
冶炼工艺路线为:BOF→LF→RH→CC,转炉容量为300吨。
转炉和LF冶炼后化学成分wt%:C:0.03%,Si:0.005%,Mn:0.25%,P:0.025%,S:0.01%。
进入RH后加入铝进行预脱氧,脱氧后钢液中氧含量为0.014%;加入100kg Ti、5kgLa、3kg Ce,取钢样进行成分化验,结果为C:0.0013%,Si:0.004%,Mn:0.009%,P:0.012%,S:0.006%,Ti:0.03%,La:0.001%,Ce:0.0008%,Al:0.002%,O:0.0046%,取钢样进行夹杂物检验,发现所生成的夹杂物中(La2O3+Ce2O3)/TiO2的比值为0.2。
将钢液浇注到中包内,当中包液面稳定后取钢样进行全氧含量测试,全氧量为0.008%,大包长水口流量为4.4t/min,向中包内喂La粉包芯线,喂线速度为40g/min,取中包样进行化学成分[O]、[La]测试,[O]值为0.005%,[La]为0.0018%。
浇注铸坯下线检验,铸坯尺寸为1800×230mm,从铸坯内弧表面向铸坯中心方向取样,检验厚度为20mm,发现铸坯表层夹杂物为La2O3、Ce2O3、TiO2、A12O3的复合夹杂,夹杂物尺寸在0.5~30μm,(La2O3+Ce2O3)/TiO2的比值为0.25,浇铸罐次4罐,未发现水口堵蓄,轧制后成品轧板未发现表面质量缺陷。
实施例2:
冶炼工艺路线为BOF→LF→RH→CC,转炉容量为300吨。
转炉和LF冶炼后化学成分wt%:C:0.025%,Si:0.004%,Mn:0.35%,P:0.030%,S:0.009%。
进入RH后加入铝进行预脱氧,脱氧后钢液中氧含量为0.018%,加入90kg Ti、15kgLa、5kg Ce,取钢样进行成分化验,结果为C:0.0013%,Si:0.004%,Mn:0.009%,P:0.012%,S:0.006%,Ti:0.028%,La:0.0021%,Ce:0.00010%,Al:0.002%,O:0.0046%,取钢样进行夹杂物检验,发现所生成的夹杂物中(La2O3+Ce2O3)/TiO2的比值为0.15。
将钢液浇注到中包内,当中包液面稳定后取钢样进行全氧含量测试,全氧量为0.0069%,大包长水口流量为4.4吨/min,向中包内喂La粉包芯线,喂线速度为40g/min,取中包样进行化学成分[O]、[La]测试,[O]值为0.0047%,[La]为0.0021%。
浇注铸坯下线检验,铸坯尺寸为1800×230mm,从铸坯内弧表面向铸坯中心方向取样,检验厚度为20mm,发现铸坯表层夹杂物为La2O3、Ce2O3、TiO2、A12O3的复合夹杂,夹杂物尺寸在0.5μm~30μm,(La2O3+Ce2O3)/TiO2的比值为0.3,浇铸罐次4罐,未发现水口堵蓄,轧制成的成品轧板未发现表面质量缺陷。
Claims (1)
1.一种减少水口堵蓄提高轧板表面质量的冶炼方法,其特征在于,冶炼工艺为BOF-LF-RH-CC,其具体方法和步骤为:
(1)转炉和LF冶炼后化学成分wt%满足:C:0~0.05%,Si:0~0.01%,Mn:0~0.5%,P:0~0.05%,S:0~0.02%;
(2)钢液进入RH后,向钢液中加Al进行预脱氧,使钢液中氧保持在0.004%~0.02wt%范围内;
(3)尔后向钢液中加入Ti、La、Ce,加入量为:Ti:0.01~0.4wt%,La+Ce:0.001~0.01wt%,所生成的复合夹杂物中(La2O3+Ce2O3)/TiO2比值在0.1~0.7范围内,对钢液进行取样测全氧含量;
(4)将满足上述条件的钢水浇注到中包内,并对中包内钢水进行取样测全氧含量,计算出钢水在中包内的增氧量;然后向中包内加入La、Ce金属或两者的混合物,加入量为中包内钢液增氧量的0.2~1.2倍;
(5)将上述钢水浇铸成铸坯。
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JPS61179811A (ja) * | 1985-02-06 | 1986-08-12 | Nippon Kokan Kk <Nkk> | 耐硫化物腐食割れ性に優れた清浄鋼の製造法 |
JP2002332516A (ja) * | 2001-05-09 | 2002-11-22 | Nippon Steel Corp | 溶鋼中微細酸化物の多量分散方法 |
JP2009113086A (ja) * | 2007-11-07 | 2009-05-28 | Nippon Steel Corp | 極低炭素鋼の連続鋳造方法 |
CN101302573A (zh) * | 2008-06-17 | 2008-11-12 | 鞍钢股份有限公司 | 用于制备细小氧化物弥散钢的添加剂及其制法和应用 |
CN101319259A (zh) * | 2008-07-17 | 2008-12-10 | 鞍钢股份有限公司 | 细小氧化物弥散钢的制备方法 |
Cited By (1)
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CN111593252A (zh) * | 2020-06-30 | 2020-08-28 | 新余钢铁股份有限公司 | 一种稀土钢冶炼方法 |
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