CN108396091B - 一种低硅低铝低氧钢的冶炼方法 - Google Patents
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Abstract
本发明提供一种低硅低铝低氧钢的冶炼方法,铁水预处理向铁水中喷入石灰和钝化金属镁粉,将铁水S脱至<0.0020%;脱硫后彻底扒渣,铁水温度>1260℃。转炉兑铁,铁水P≤0.08%,采用单渣法冶炼;铁水P>0.08%,则选择双渣法冶炼;转炉沸腾出钢,出钢C 0.065~0.08%,氧活度500~600ppm,Mn<0.05%,P<0.009%,出钢温度<1665℃。RH真空度0.2kPa以下的时间不低于20min;脱氧后破空,喂Ca‑Fe线,Ca含量达到10~25ppm时停止喂线;结束喂线后弱吹氩时间大于10min后直接上机浇注。本发明在不增加生产成本,不拉长生产节奏的前提下,既可保证钢中低铝低氧,又能保证全氧的低值,有效解决低硅低铝钢的全氧控制难题,并有利于钢质的纯净化。
Description
技术领域
本发明属于冶金技术领域,特别涉及一种低硅低铝低氧钢的冶炼方法。
背景技术
钢铁工业的竞争日趋激烈,钢铁工业将以调整结构,适应市场为主。成品质量将成为核心因素。从当前的连铸实际生产和进一步发展看,高速连铸、近终形连铸、连铸坯热送热装工艺、连铸坯直接轧制工艺以及连铸钢种和品种的增多均是以铸坯的高质量为前提,因此确保连铸坯质量已成为连铸技术的关键环节。
钢的性能主要决定于钢的化学成分和组织。现在对钢的强度、韧性、寿命和加工性能等要求日益严格,对钢的化学成分和组织均匀性的要求也日益严格。钢中非金属夹杂物的存在是钢制品性能的重要因素,有时甚至是决定性因素。夹杂物对钢的力学性能和工艺性能的影响,主要是降低材料的塑性、韧性、疲劳性能和耐腐蚀性能,尤其当夹杂物以不利的形状及分布特征存在时,对材料的机械性能影响更为严重。统计结果表明,疲劳破坏约占机器零件失效原因的90%以上。钢中非金属夹杂物,如氧化物、硫化物等危害性就在于都呈独立相存在,破坏了钢基体的均匀连续性,造成了应力集中,促进了疲劳裂纹的产生,并在一定条件下加速了裂纹的扩展,从而加速了疲劳破坏的过程。
发明内容
本发明旨在提供一种在全程适当加铝的基础上,精炼过程通过碳脱氧后再利用喂丝工艺将钢中残氧去除,从而既保证钢中低铝,又保证全氧低值的低硅低铝低氧钢的冶炼方法。
为此,本发明所采取的技术解决方案是:
一种低硅低铝低氧钢的冶炼方法,所述低硅低铝低氧钢的成分质量百分比含量为:C≤0.05%,Si≤0.05%,Mn≤0.05%,Al≤0.002%,O≤0.002%,N≤0.003%,P≤0.010%,S≤0.010%;
冶炼方式为铁水预处理深脱S,转炉沸腾出钢,RH脱氧并弱吹氩;具体方法和步骤为:
(1)铁水预处理根据铁水情况,向铁水中喷入石灰和钝化金属镁粉,将铁水S脱至<0.0020%;脱硫后彻底扒渣,扒渣后铁水温度>1260℃;
(2)转炉兑铁,如果铁水P≤0.08%,采用单渣法冶炼;如果铁水P>0.08%,则选择双渣法冶炼;转炉沸腾出钢,出钢C控制在0.065~0.08%,同时保证出钢时钢中氧活度为500~600ppm;如果钢中氧活度>600ppm,则在炉后进行喂铝线操作,控制罐内钢水氧活度在500~600ppm;出钢Mn控制在0.05%以下,P控制在0.009%以下,出钢温度控制在1665℃以上;
(3)出钢后钢包运至RH工位,进站测温后进入真空模式,为保证碳脱氧的能力和效果,RH真空度0.2kPa以下的时间不低于20min;之后定氧加铝,将氧活度控制在40~60ppm后破空,其后进行喂Ca-Fe线操作,在钢中Ca含量达到10~25ppm时停止喂线;结束喂线后进行弱吹氩操作,弱吹氩时间大于10min后直接上机浇注。
本发明的有益效果为:
本发明通过精准的转炉终点控制,获得良好的C-O差值,在进入RH后进行碳脱氧而不污染钢液,之后用铝将钢水中的氧脱到适当值的基础上用喂线处理中将残氧脱除,达到低氧的目的。既可保证钢中低铝低氧,又能保证全氧的低值,有效解决低硅低铝钢的全氧控制难题。本发明不增加生产成本,不拉长生产节奏,同时对钢质的纯净化也极为有利。
具体实施方式
在260t转炉、260t钢包上实施。
实施例1:
1、铁水预处理进行脱硫处理,向铁水中喷入石灰和钝化金属镁粉,S含量控制在0.0017%。脱硫后扒渣,处理完毕后铁水温度1290℃。
2、铁水P值为0.108%,转炉选择双渣法冶炼。其终点控制如下:C:0.07%,P:0.0084%,Mn:0.04%,出钢温度1670℃,罐内钢水氧活度为580ppm。
3、进入RH后,测温1613℃,进行抽真空操作用来进行碳脱氧反应,真空度在0.2kPa的时间达到18min,加铝88kg后定氧为57ppm。RH破空,开始喂Ca-Fe线,喂线900m时定氧7.8ppm,随后再次喂线500m,钢中钙含量为0.0020%。之后进行弱吹氩,弱吹氩13min后上机浇注。
实施例2:
1、铁水预处理进行脱硫处理,脱硫后扒渣;处理完毕后铁水温度1287℃,S含量为0.0012%。
2、铁水P值为0.112%,转炉选择双渣法冶炼。其终点控制如下:C:0.073%,P:0.0088%,Mn:0.043%,出钢温度1672℃,罐内钢水氧活度为560ppm;
3、进入RH后,测温1616℃,进行抽真空操作用来进行碳脱氧反应,真空度在0.2kPa的时间达到19min,加铝86kg后定氧为52ppm。RH破空,开始喂Ca-Fe线,喂线940m时定氧8.5ppm,随后再次喂线450m,钢中钙含量为0.0019%。之后进行弱吹氩,弱吹氩12min后上机准备浇注。
实施例3:
1、铁水预处理进行脱硫处理,脱硫后扒渣;处理完毕后铁水温度1292℃,S含量为0.0013%。
2、铁水P值为0.072%,转炉选择单渣法冶炼。其终点控制如下:C:0.071%,P:0.0076%,Mn:0.047%,出钢温度1678℃,罐内钢水氧活度为577ppm;
3、进入RH后,测温1619℃,进行抽真空操作用来进行碳脱氧反应,真空度在0.2Kpa的时间达到19min,加铝92kg后定氧为51ppm。RH破空,开始喂Ca-Fe线,喂线980m时定氧5.5ppm,随后再次喂线450m,钢中钙含量为0.0022%。之后进行弱吹氩,弱吹氩15min后上机准备浇注。
实施例1~3铸坯最终成分质量百分比如表1所示。
表1实施例1~3的最终成分
实施例 | C | Si | Mn | P | S | Al | T.O | N |
1 | 0.01 | 0.022 | 0.047 | 0.0080 | 0.009 | 0.0017 | 0.0019 | 0.0021 |
2 | 0.0092 | 0.027 | 0.045 | 0.0089 | 0.0086 | 0.0015 | 0.0017 | 0.0019 |
3 | 0.0094 | 0.026 | 0.049 | 0.0077 | 0.0083 | 0.0018 | 0.0017 | 0.0024 |
经检验,本发明冶炼方法生产的铸坯完全满足低硅低铝低氧钢的成分及生产工艺要求。
Claims (1)
1.一种低硅低铝低氧钢的冶炼方法,其特征在于,所述低硅低铝低氧钢的成分质量百分比含量为:C≤0.05%,Si≤0.05%,Mn≤0.05%,Al≤0.002%,O≤0.002%,N≤0.003%,P≤0.010%,S≤0.010%;余量为Fe和不可避免的杂质;
冶炼方式为铁水预处理深脱S,转炉沸腾出钢,RH脱氧并弱吹氩;具体方法和步骤为:
(1)铁水预处理根据铁水情况,向铁水中喷入石灰和钝化金属镁粉,将铁水S脱至<0.0020%;脱硫后彻底扒渣,扒渣后铁水温度>1260℃;
(2)转炉兑铁,如果铁水P≤0.08%,采用单渣法冶炼;如果铁水P>0.08%,则选择双渣法冶炼;转炉沸腾出钢,出钢C控制在0.065~0.08%,同时保证出钢时钢中氧活度为500~600ppm;如果钢中氧活度>600ppm,则在炉后进行喂铝线操作,控制罐内钢水氧活度在500~600ppm;出钢Mn控制在0.05%以下,P控制在0.009%以下,出钢温度控制在1665℃以上;
(3)出钢后钢包运至RH工位,进站测温后进入真空模式,为保证碳脱氧的能力和效果,RH真空度0.2kPa以下的时间不低于20min;之后定氧加铝,将氧活度控制在40~60ppm后破空,其后进行喂Ca-Fe线操作,在钢中Ca含量达到10~25ppm时停止喂线;结束喂线后进行弱吹氩操作,弱吹氩时间大于10min后直接上机浇注。
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CN105908056A (zh) * | 2016-06-17 | 2016-08-31 | 辽宁科技大学 | 一种低碳低氮高铬钢的冶炼方法 |
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CN102851435A (zh) * | 2012-09-12 | 2013-01-02 | 首钢总公司 | 一种超低碳、低硅和低氧钢及其冶炼方法 |
CN104561429A (zh) * | 2014-12-25 | 2015-04-29 | 安阳钢铁股份有限公司 | 一种低碳低硅钢的控硅方法 |
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