CN115305411A - 一种超深冲冷轧搪瓷钢高效生产的方法 - Google Patents
一种超深冲冷轧搪瓷钢高效生产的方法 Download PDFInfo
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Abstract
本发明公开了一种超深冲冷轧搪瓷钢高效生产的方法,属于搪瓷钢产技术领域。本发明的步骤为:步骤一:转炉根据热平衡控制入炉废钢量≤50吨,辅吹过程通过提高底吹氩气流量,增加熔池搅拌,降低终点氧;步骤二:出钢1/3时加入石灰,出钢结束抬炉后立即向钢包渣面加入炉渣调整剂和炉渣脱氧剂进行调整渣系结构。本发明通过对调整钢包顶渣渣系结构,全工序控制钢水过程氧含量,提高钢水洁净度,连铸采取全程保护浇铸,改善钢水可浇性,提高连浇炉数。“热机清+热装”组产模式,减少生产交货周期,降低生产成本,提高搪瓷钢炼钢生产效率。
Description
技术领域
本发明涉及搪瓷钢生产技术领域,更具体地说,涉及一种超深冲冷轧搪瓷钢高效生产的方法。
背景技术
冷轧搪瓷钢具有优异的耐腐蚀性、耐热性、耐磨性,广泛地应用于轻工、家电、冶金、化工、建筑等行业。因其要求具有较好的冲压性能和抗鳞爆性能,成分设计往往采用超低碳、高硫、高氮、高钛成分体系,通过热轧及冷轧退火过程中的Ti的析出相,如TiN、TiS、Ti4C2S2和Ti(C,N)等第二相析出物作为氢陷阱以提高钢板的抗鳞爆性能。此成分设计虽满足性能要求,但根据冶金学原理,钢水冶炼和浇铸过程易生成TiOX-Al2O3、硫化物类夹杂物,浇铸过程易水口蓄瘤,严重的会导致水口堵塞停浇,影响连浇炉数提升,一般钢厂为稳定生产连浇炉数限制在3-4炉左右。另外因钢种成分特点避免铸坯自然冷却产生裂纹,同时需满足成品对表面质量的要求,铸坯产出后需在保温坑缓冷72h后再进行铸坯表面自动火焰机清处理,增加了订单生产交付周期。连浇炉数低和生产交付周期长已严重限制搪瓷钢生产效率的提升,因此亟需开发一种搪瓷钢高效生产的方法是十分必要的。
发明内容
1.发明要解决的技术问题
针对现有技术存在的缺陷与不足,本发明提供了一种超深冲冷轧搪瓷钢高效生产的方法,本发明通过对调整钢包顶渣渣系结构,全工序控制钢水过程氧含量,提高钢水洁净度,连铸采取全程保护浇铸,改善钢水可浇性,提高连浇炉数。“热机清+热装”组产模式,减少生产交货周期,降低生产成本,提高搪瓷钢炼钢生产效率。
2.技术方案
为达到上述目的,本发明提供的技术方案为:
本发明的一种超深冲冷轧搪瓷钢高效生产的方法,其所冶炼搪瓷钢成分为:C≤0.0050%,Si≤0.03%,Mn:0.10-0.20%,P≤0.020%,S:0.022-0.035%,Alt:0.02-0.08%,Ti:0.090-0.120%,Cu:0.20-0.50%,N:0.0050-0.0100%,该方法涉及冶炼钢种工艺路径为:铁水预处理→300t转炉→RH精炼→连铸→火焰清理→热装轧制,其步骤为:
步骤一:转炉根据热平衡控制入炉废钢量≤50吨,辅吹过程通过提高底吹氩气流量,增加熔池搅拌,降低终点氧,底吹氩气流量为1980m3/h,转炉终点氧控制在350-500ppm,终点温度1670-1690℃;
步骤二:出钢1/3时加入石灰600±50kg/炉,出钢结束抬炉后立即向钢包渣面加入炉渣调整剂和炉渣脱氧剂进行调整渣系结构,降低炉渣氧化性,目标控制钢包顶渣TFe≤6%,钙铝比1.2-1.8;
步骤三:RH根据钢水进站碳、氧条件,通过脱碳期间加入碳粉尽可能降低脱碳结束氧控制在80-200ppm,为后面减少因铝脱氧产生氧化铝夹杂数量创造条件,改善钢水洁净度;铝脱氧循环6min后加入钛铁、硫铁调整成分至目标值,并在脱氧提升气体由氩气切换为氮气对钢水增氮,控制钢水氮含量至目标值,钛铁等合金化后钢水循环要求≥8min;
步骤四:连铸采用整体式浸入式水口,塞棒吹氩流量设置6-9L/min,全程保证恒拉速浇铸;
步骤五:铸坯切割完后要求在5小时内完成自动火焰清理,表面清理深度4mm;
步骤六:铸坯机清结束后快速排入热轧生产计划,安排进入加热炉,要求进加热炉前铸坯温度≥400℃。
进一步地,所述的步骤二的加入方式为:先在缓冲斗放入炉渣调整剂,后放入脱氧铝粒,抬炉后一起加入;炉渣调整剂和炉渣脱氧剂加入量则根据转炉终点定氧结果确定。
进一步地,所述的步骤二中,加炉渣调整剂化学组分包括CaO:20.0~40.0%,SiC:15.0-30.0%,C≥10%,S≤0.15%,P≤0.08%,MgO≤8.0%,粒度为10-40mm,所加炉渣脱氧剂为铝粒,Al≥99.5%,充分利用炉渣调整剂发泡效果,使渣料加入后快速铺开钢包渣面,并快速与钢渣反应充分,降低钢渣氧化性。
3.有益效果
采用本发明提供的技术方案,与现有技术相比,具有如下有益效果:
本发明通过对调整钢包顶渣渣系结构,全工序控制钢水过程氧含量,提高钢水洁净度,连铸采取全程保护浇铸,改善钢水可浇性,提高连浇炉数。“热机清+热装”组产模式,减少生产交货周期,降低生产成本,提高搪瓷钢炼钢生产效率。
附图说明
图1为本发明的实施例1浇筑曲线图;
图2为本发明的实施例2浇筑曲线图。
具体实施方式
下面结合附图和实施例对本发明作进一步的描述:
实施例1
从图1-2可以看出,本实施例的一种超深冲冷轧搪瓷钢高效生产的方法,其所冶炼搪瓷钢成分为:C≤0.0050%,Si≤0.03%,Mn:0.10-0.20%,P≤0.020%,S:0.022-0.035%,Alt:0.02-0.08%,Ti:0.090-0.120%,Cu:0.20-0.50%,N:0.0050-0.0100%,该方法涉及冶炼钢种工艺路径为:铁水预处理→300t转炉→RH精炼→连铸→火焰清理→热装轧制,其步骤为:
步骤一:转炉根据热平衡控制入炉废钢量≤50吨,辅吹过程通过提高底吹氩气流量,增加熔池搅拌,降低终点氧,底吹氩气流量为1980m3/h,转炉终点氧控制在350-500ppm,终点温度1670-1690℃;
步骤二:出钢1/3时加入石灰600±50kg/炉,出钢结束抬炉后立即向钢包渣面加入炉渣调整剂和炉渣脱氧剂进行调整渣系结构,降低炉渣氧化性,目标控制钢包顶渣TFe≤6%,钙铝比1.2-1.8;
炉渣调整剂和炉渣脱氧剂加入量则根据转炉终点定氧结果确定,加入量基准表如下表1。
表1炉渣调整剂和炉渣脱氧剂加入量基准表
副枪定氧/ppm | 350<[O]≤450 | 450<[O]≤550 | >550 |
炉渣调整剂/kg | 370±50 | 400±50 | 430±50 |
铝粒加入量/kg | 160±20 | 190±20 | 210±20 |
步骤三:RH根据钢水进站碳、氧条件,通过脱碳期间加入碳粉尽可能降低脱碳结束氧控制在80-200ppm,为后面减少因铝脱氧产生氧化铝夹杂数量创造条件,改善钢水洁净度;铝脱氧循环6min后加入钛铁、硫铁调整成分至目标值,并在脱氧提升气体由氩气切换为氮气对钢水增氮,控制钢水氮含量至目标值,钛铁等合金化后钢水循环要求≥8min;
步骤四:连铸采用整体式浸入式水口,塞棒吹氩流量设置6-9L/min,全程保证恒拉速浇铸;
步骤五:铸坯切割完后要求在5小时内完成自动火焰清理,表面清理深度4mm;
步骤六:铸坯机清结束后快速排入热轧生产计划,安排进入加热炉,要求进加热炉前铸坯温度≥400℃。
步骤二的加入方式为:先在缓冲斗放入炉渣调整剂,后放入脱氧铝粒,抬炉后一起加入;炉渣调整剂和炉渣脱氧剂加入量则根据转炉终点定氧结果确定。
步骤二中,加炉渣调整剂化学组分包括CaO:20.0~40.0%,SiC:15.0-30.0%,C≥10%,S≤0.15%,P≤0.08%,MgO≤8.0%,粒度为10-40mm,所加炉渣脱氧剂为铝粒,Al≥99.5%,充分利用炉渣调整剂发泡效果,使渣料加入后快速铺开钢包渣面,并快速与钢渣反应充分,降低钢渣氧化性。
具体实施过程中,实施例1与实施例2在同组工况下同时生产,其生产过程指标如下
表2实施例主要生产过程指标结果
本实施例连浇炉数由原来3-4炉提高到6炉,生产浇铸过程稳定,采用“热机清+热装”组产模式,生产周期减少了5-6天,产品性能和抗磷爆试验经验证均符合标准要求,新方法大大提高搪瓷钢炼钢生产效率,支撑了搪瓷钢炼钢产能释放,同时降低了生产成本进一步提高了产品竞争力
本发明通过调整钢包顶渣渣系结构、降低钢包顶渣氧化性,钢包顶渣TFe≤6%,钙铝比1.2-1.8,减少顶渣对钢水二次氧化,提高顶渣对夹杂物的吸附能力,改善钢水可浇铸性;采用全工序低氧位控制:降低转炉终点氧和RH低脱碳结束氧,提高钢水洁净度;连铸采用整体式浸入式水口,合理设置塞棒吹氩流量,减少钢水蓄瘤趋势,采用“热机清+热装”组产模式,减少生产交货周期,降低生产成本;
通过本发明技术实施,搪瓷钢钢水可浇性明显改善,连浇炉数由之前3-4炉提高至稳定浇铸6炉以上。铸坯采用“热机清+热装”组产模式,生产周期减少了5-6天,产品性能和抗磷爆试验经验证均符合标准要求,新方法大大提高搪瓷钢炼钢生产效率,支撑了搪瓷钢炼钢产能释放,同时降低了生产成本提高了产品竞争力。
本发明通过对调整钢包顶渣渣系结构,全工序控制钢水过程氧含量,提高钢水洁净度,连铸采取全程保护浇铸,改善钢水可浇性,提高连浇炉数。“热机清+热装”组产模式,减少生产交货周期,降低生产成本,提高搪瓷钢炼钢生产效率。
以上示意性的对本发明及其实施方式进行了描述,该描述没有限制性,附图中所示的也只是本发明的实施方式之一,实际的结构并不局限于此。所以,如果本领域的普通技术人员受其启示,在不脱离本发明创造宗旨的情况下,不经创造性的设计出与该技术方案相似的结构方式及实施例,均应属于本发明的保护范围。
Claims (3)
1.一种超深冲冷轧搪瓷钢高效生产的方法,其所冶炼搪瓷钢成分为:C≤0.0050%,Si≤0.03%,Mn:0.10-0.20%,P≤0.020%,S:0.022-0.035%,Alt:0.02-0.08%,Ti:0.090-0.120%,Cu:0.20-0.50%,N:0.0050-0.0100%,该方法涉及冶炼钢种工艺路径为:铁水预处理→300t转炉→RH精炼→连铸→火焰清理→热装轧制,其特征在于:其步骤为:
步骤一:转炉根据热平衡控制入炉废钢量≤50吨,辅吹过程通过提高底吹氩气流量,增加熔池搅拌,降低终点氧,底吹氩气流量为1980m3/h,转炉终点氧控制在350-500ppm,终点温度1670-1690℃;
步骤二:出钢1/3时加入石灰600±50kg/炉,出钢结束抬炉后立即向钢包渣面加入炉渣调整剂和炉渣脱氧剂进行调整渣系结构,降低炉渣氧化性,目标控制钢包顶渣TFe≤6%,钙铝比1.2-1.8;
步骤三:RH根据钢水进站碳、氧条件,通过脱碳期间加入碳粉尽可能降低脱碳结束氧控制在80-200ppm,为后面减少因铝脱氧产生氧化铝夹杂数量创造条件,改善钢水洁净度;铝脱氧循环6min后加入钛铁、硫铁调整成分至目标值,并在脱氧提升气体由氩气切换为氮气对钢水增氮,控制钢水氮含量至目标值,钛铁等合金化后钢水循环要求≥8min;
步骤四:连铸采用整体式浸入式水口,塞棒吹氩流量设置6-9L/min,全程保证恒拉速浇铸;
步骤五:铸坯切割完后要求在5小时内完成自动火焰清理,表面清理深度4mm;
步骤六:铸坯机清结束后快速排入热轧生产计划,安排进入加热炉,要求进加热炉前铸坯温度≥400℃。
2.根据权利要求1所述的一种超深冲冷轧搪瓷钢高效生产的方法,其特征在于:所述的步骤二的加入方式为:先在缓冲斗放入炉渣调整剂,后放入脱氧铝粒,抬炉后一起加入;炉渣调整剂和炉渣脱氧剂加入量则根据转炉终点定氧结果确定。
3.根据权利要求1所述的一种超深冲冷轧搪瓷钢高效生产的方法,其特征在于:所述的步骤二中,加炉渣调整剂化学组分包括CaO:20.0~40.0%,SiC:15.0-30.0%,C≥10%,S≤0.15%,P≤0.08%,MgO≤8.0%,粒度为10-40mm,所加炉渣脱氧剂为铝粒,Al≥99.5%,充分利用炉渣调整剂发泡效果,使渣料加入后快速铺开钢包渣面,并快速与钢渣反应充分,降低钢渣氧化性。
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