CN115491577B - 一种提高汽车空心稳定杆用钢洁净度的冶炼方法 - Google Patents
一种提高汽车空心稳定杆用钢洁净度的冶炼方法 Download PDFInfo
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Abstract
本发明属于炼钢技术领域,具体公开了一种提高汽车空心稳定杆用钢洁净度的冶炼方法,采用“BOF+LF+RH+CC”工艺路线,转炉出钢时一次性加入造渣料,全程使用低碳低钙合金,控制炉渣碱度,采用高品位粉状碳化硅造还原渣,保持LF精炼后钢中夹杂物大部分为固态氧化物,然后通过RH高真空强搅拌去除,再进行少量钙处理后得到理想的变性夹杂物,最终以较低的成本实现提高汽车空心稳定杆用钢洁净度的目的,可以将其A类、B类、D类夹杂物控制在1.0级以下,C类夹杂物控制在0级,Ds类夹杂物控制在0.5级以下;并且成品氧含量可控制在0.0010%以下、S含量控制在0.005%以下。
Description
技术领域
本发明属于炼钢技术领域,具体公开了一种提高汽车空心稳定杆用钢洁净度的冶炼方法。
背景技术
汽车横向稳定杆,又称为防倾杆或者平衡杆,是汽车辅助型弹性元件中重要的组成部分之一。稳定杆在使用过程中主要承受旋转扭矩,其受力时,距离圆心越远其承受的转动力矩越大,而在圆心处受到的扭转力矩为零,因此在汽车行业采用先进高强钢制造的质量更轻、应力更高的空心稳定杆用来替代传统的实心稳定杆,并不会对其使用造成太大的影响,而且在保证产品高强度的同时,还可以有效地降低车身的质量,实现单个零件质量有效降低20%~40%。
目前汽车空心稳定杆制造技术有焊管与无缝管之分,采用无缝管技术的产品无焊缝,性能可靠,且在成本上更加具有竞争力,但同时对原材料的内部质量提出了更高的要求。无缝管技术生产工艺包括穿孔、校圆、减壁、减径等,在穿孔过程中,金属沿芯棒顶头轮廓,以轴向变形为主+横向变形为辅的方式碾扩成孔,原轴向分散分布的夹杂物间的距离逐渐缩小,向变形最大的内壁区集中,而大型夹杂物则会沿斜横向铺展成一个时断时续的薄弱面。在后续校圆、减壁、减径中,空心管自外而内依次收缩,内壁区含夹杂带的夹层因不能随本体同步缩减而离解,从而可能导致空心管内壁形成鼓包、破口、翘皮、内折等缺陷。所以下游加工采用无缝管工艺的汽车空心稳定杆用钢,对于非金属夹杂物的的要求极为苛刻,需要探索新工艺来提高汽车空心稳定杆用热轧圆钢的洁净度。
汽车空心稳定杆用钢为铝镇静钢,B类、D类及Ds夹杂物的控制是难点,常规控制思路为采用低碱度渣或不进行钙处理,以减少钢液中较大尺寸的CaO-Al2O3系液态夹杂物,但本钢种同时要求S含量≤0.005%,低碱度渣不利于硫的去除,若采用KR处理则会增加一定的成本。
发明内容
本发明的目的是提供一种提高汽车空心稳定杆用钢洁净度的冶炼方法。通过控制转炉终点碳含量、出钢双挡渣、使用低碳低钙含量合金、钢包顶渣在出钢时一次性加入、LF钢水到站后迅速升温使用高品位碳化硅造还原渣、RH采用高真空度强搅拌、少量钙处理,不仅能达到控制钢中非金属夹杂物的效果,同时还能保证产品氧含量和硫含量达到较低水平。
本发明通过以下技术方案来实现:
一种提高汽车空心稳定杆用钢洁净度的冶炼方法,其适用钢种按照质量百分数的组成为:C:0.24%~0.28%,Si:0.20%~0.30%,Mn:1.20%~1.40%,P≤0.020%,S≤0.005%,Cr:0.10%~0.18%,Ni≤0.20%,Cu≤0.10%,Al:0.020%~0.050%,Ti:0.020%~0.040%,B:0.0015%~0.0035%,As≤0.030%,Sn≤0.030%,Ca≤0.0012%,O≤0.0018%,余量为Fe。
一种提高汽车空心稳定杆用钢洁净度的冶炼方法:铁水经过转炉初炼、LF精炼、RH真空处理、连铸、连铸坯加热、轧制、轧后堆冷,即可得到成品汽车空心稳定杆用钢。
具体步骤如下:
(1)转炉初炼
转炉冶炼终点C含量控制在0.08%以上,出钢使用滑板和挡渣锥联合挡渣,严禁初炼氧化性渣进入钢包;出钢先加铝进行脱氧,随后加入硅锰、低碳锰铁、低碳铬铁进行合金化,再一次性加入石灰、护炉剂进行造渣(总用量7.5~9kg/t),LF精炼过程不再补加造渣料;
(2)LF精炼
LF钢水到站后迅速通电升温,采用高品位粉状碳化硅(SiC含量≥74%)进行渣面脱氧,造富含CO气体的还原发泡渣提高炉渣脱硫能力和吸附夹杂能力,将钢中S含量控制在≤0.005%;根据LF初样检测结果使用硅锰、低碳锰铁、低碳铬铁微调钢液成分,不再添加石灰、萤石等造渣料,将渣中(FeO+MnO)含量控制在0.85%以下,精炼炉渣碱度控制在2.5~4.5,LF精炼结束钢液中的Al含量控制为0.030~0.050%;
(3)RH真空脱气
RH提升气体流量96~120Nm3/h,高真空(≤67Pa)处理时间≥20min,破空后先喂入钛铁线、再加入硼铁,后进行少量钙处理,每炉钙线用量11.1~25.9kg,不再喂入铝线,软吹时间≥15min后吊包浇铸。
(4)连铸
连铸采用全程保护浇铸,保持恒拉速。
本发明的技术方案原理和有益效果为:
(1)使用低碳类合金,最大限度提高转炉终点碳,双挡渣操作防止下渣,降低钢水初始氧化性。出钢时一次性加入造渣料,可以缩短LF化渣时间,使用高品位粉状碳化硅造还原渣,脱氧产物SiO2进入炉渣可进一步促进化渣,优化炉渣成分将渣中(FeO+MnO)含量控制在0.85%以下。在不进行KR处理、不采用高碱度渣的情况下,也可以控制精炼钢液中S含量≤0.005%。此外,更低的S含量还可以减少A类硫化物夹杂的产生。
(2)全程使用低钙类合金、LF精炼过程不补加石灰等造渣料,可减少钢液中Ca含量以及减少炉渣向钢液传Ca,同时碳化硅的脱氧产物SiO2可以促进Ca重新成为CaO进入炉渣,以此保持了LF精炼后钢中夹杂物大部分为固态氧化物。
(3)通过RH高真空度强搅拌后,可去除大部分固态氧化物,但还存在少量1~5μm小尺寸的液态或半液态CaO-Al2O3系夹杂物,在浇铸过程中容易聚集长大。做为补充控制手段,真空处理后对钢液进行少量钙处理,一方面保证钢水可浇性,另一方面钙处理效果显著提高,所得到的高熔点系夹杂物在轧制过程中不易变形延展,降低了B类、D类夹杂物的形成几率。
(4)连铸全程保护浇铸,防止钢水二次氧化,保持恒拉速,为各类夹杂物的进一步上浮创造有利条件。
附图说明:
图1为实施例1冶炼过程钢液中夹杂物变化情况(实施例2、实施例3变化规律与之相同);
图2为对比例1冶炼过程钢液中夹杂物变化情况;
图3为对比例3冶炼过程钢液中夹杂物变化情况;
图4为对比例5冶炼过程钢液中夹杂物变化情况。
具体实施方式
下面结合具体实施方法对本发明进行进一步详细说明,但本发明的保护范围并不仅限于所述内容。本发明中所用原料、设备,若无特别说明,均为本领域的常用原料、设备;本发明中所用方法,若无特别说明,均为本领域的常规方法。凡是依据本发明的技术实质对以上实施例作的修改,均包含在本发明的保护范围之内。
实施例1
成品熔炼成分:C:0.26%;Si:0.27%;Mn:1.33%,P:0.013%,S:0.005%,Cr:0.15%,Ni:0.003%,Cu:0.014%,Al:0.025%,Ti:0.030%,B:0.0021%,As:0.002%,Sn:0.002%,Ca:0.0006%,余量为Fe。
(1)转炉冶炼:转炉出钢量130t,终点C含量0.08%、S含量0.026%,出钢时依次加入脱氧剂铝饼1.3kg/t、硅锰合金(C≤1.8%、Si≥17%、Mn≥65%、P≤0.25%、S≤0.04%、水份≤0.1%)1131kg、低碳锰铁(C≤0.7%、Si≤1.5%、Mn≥80%、P≤0.15%、S≤0.02%、水份≤0.1%)1192kg、低碳铬铁(C≤0.5%、Si≤2.0%、Cr≥55%、P≤0.04%、S≤0.03%、水份≤0.1%)62kg、低氮增碳剂(C≥96%、N≤0.030%、S≤0.04%、水份≤0.5%)50kg、以及石灰3.5kg/t和护炉剂4.55kg/t(总加入量8.05kg/t)。
(2)LF精炼:对钢水进行升温至1620℃~1640℃、取样,根据成分微调成分,喂入169kg铝线,再加入240kg碳化硅进行渣面脱氧,并加入低碳锰铁110kg、低碳铬铁107kg,低氮增碳剂10kg(成分同步骤(1))。LF末期继续采用Al线调整钢液中Al含量为0.043%。精炼炉渣成分如表2所示,LF出站钢液S含量为0.005%。
(3)RH真空脱气:提升气体流量100Nm3/h,极限真空度60Pa,高真空保持时间22min,破空后取样检测成分,喂入钛铁线30kg、再加入硼铁20kg,后喂入钙线18.5kg,不再喂入铝线,软吹23min后上钢浇铸。
(4)连铸:全程保护浇铸,恒拉速0.85m/min。
实施例1制备的钢材采用GB/T 10561标准A法进行非金属夹杂物检测,其评级为:A细0.5级、A粗0.0级、B细≤1.0级、B粗≤0.0级、C细≤0.0级、C粗≤0.0级、D细≤1.0级、D粗≤0.5级、Ds≤0.5级。成品S含量0.005%,轧材氧含量0.0008%。
实施例2
成品熔炼成分:C:0.26%;Si:0.26%;Mn:1.34%,P:0.013%,S:0.005%,Cr:0.15%,Ni:0.003%,Cu:0.014%,Al:0.025%,Ti:0.029%,B:0.0022%,As:0.002%,Sn:0.002%,Ca:0.0006%,余量为Fe。
(1)转炉冶炼:转炉出钢量130t,终点C含量0.08%、S含量0.026%,出钢时依次加入脱氧剂铝饼1.3kg/t、硅锰合金(C≤1.8%、Si≥17%、Mn≥65%、P≤0.25%、S≤0.04%、水份≤0.1%)1135kg、低碳锰铁(C≤0.7%、Si≤1.5%、Mn≥80%、P≤0.15%、S≤0.02%、水份≤0.1%)1202kg、低碳铬铁(C≤0.5%、Si≤2.0%、Cr≥55%、P≤0.04%、S≤0.03%、水份≤0.1%)62kg、低氮增碳剂(C≥96%、N≤0.030%、S≤0.04%、水份≤0.5%)50kg、以及石灰3.5kg/t和护炉剂4.55kg/t(总加入量8.05kg/t)。
(2)LF精炼:对钢水进行升温至1620℃~1640℃、取样,根据成分微调成分,喂入169kg铝线,再加入240kg碳化硅进行渣面脱氧,并加入低碳锰铁110kg、低碳铬铁107kg,低氮增碳剂10kg(成分同步骤(1))。LF末期继续采用Al线调整钢液中Al含量为0.043%。精炼炉渣成分如表2所示,LF出站钢液S含量为0.005%。
(3)RH真空脱气:提升气体流量100Nm3/h,极限真空度60Pa,高真空保持时间22min,破空后取样检测成分,喂入钛铁线30kg、再加入硼铁20kg,后喂入钙线18.5kg,不再喂入铝线,软吹23min后上钢浇铸。
(4)连铸:全程保护浇铸,恒拉速0.85m/min。
实施例2制备的钢材采用GB/T 10561标准A法进行非金属夹杂物检测,其评级为:A细0.5级、A粗0.0级、B细≤1.0级、B粗≤0.0级、C细≤0.0级、C粗≤0.0级、D细≤1.0级、D粗≤0.5级、Ds≤0.5级。成品S含量0.005%,轧材氧含量0.0009%。
实施例3
成品熔炼成分:C:0.26%;Si:0.27%;Mn:1.33%,P:0.013%,S:0.005%,Cr:0.15%,Ni:0.003%,Cu:0.014%,Al:0.025%,Ti:0.030%,B:0.0021%,As:0.002%,Sn:0.002%,Ca:0.0006%,余量为Fe。
(1)转炉冶炼:转炉出钢量130t,终点C含量0.08%、S含量0.026%,出钢时依次加入脱氧剂铝饼1.3kg/t、硅锰合金(C≤1.8%、Si≥17%、Mn≥65%、P≤0.25%、S≤0.04%、水份≤0.1%)1131kg、低碳锰铁(C≤0.7%、Si≤1.5%、Mn≥80%、P≤0.15%、S≤0.02%、水份≤0.1%)1192kg、低碳铬铁(C≤0.5%、Si≤2.0%、Cr≥55%、P≤0.04%、S≤0.03%、水份≤0.1%)62kg、低氮增碳剂(C≥96%、N≤0.030%、S≤0.04%、水份≤0.5%)50kg、以及石灰4.3kg/t和护炉剂4.55kg/t(总加入量8.85kg/t)。
(2)LF精炼:对钢水进行升温至1620℃~1640℃、取样,根据成分微调成分,喂入169kg铝线,再加入240kg碳化硅进行渣面脱氧,并加入低碳锰铁110kg、低碳铬铁107kg,低氮增碳剂10kg(成分同步骤(1))。LF末期继续采用Al线调整钢液中Al含量为0.043%。精炼炉渣成分如表2所示,LF出站钢液S含量为0.005%。
(3)RH真空脱气:提升气体流量100Nm3/h,极限真空度60Pa,高真空保持时间22min,破空后取样检测成分,喂入钛铁线30kg、再加入硼铁20kg,后喂入钙线18.5kg,不再喂入铝线,软吹23min后上钢浇铸。
(4)连铸:全程保护浇铸,恒拉速0.85m/min。
实施例3制备的钢材采用GB/T 10561标准A法进行非金属夹杂物检测,其评级为:A细0.5级、A粗0.0级、B细≤1.0级、B粗≤0.5级、C细≤0.0级、C粗≤0.0级、D细≤1.0级、D粗≤0.5级、Ds≤0.5级。成品S含量0.005%,轧材氧含量0.0009%。
对比例1
对比例1的出钢渣量及LF补加渣料与实施例不同,其余操作与实施例1实质相同。
成品熔炼成分:C:0.26%;Si:0.27%;Mn:1.33%,P:0.013%,S:0.005%,Cr:0.15%,Ni:0.003%,Cu:0.014%,Al:0.025%,Ti:0.030%,B:0.0021%,As:0.002%,Sn:0.002%,Ca:0.0006%,余量为Fe。
(1)转炉冶炼:转炉出钢量130t,终点C含量0.08%、S含量0.026%,出钢时依次加入脱氧剂铝饼1.3kg/t、硅锰合金1131kg、低碳锰铁1192kg、低碳铬铁62kg、低氮增碳剂50kg、以及石灰2.5kg/t和护炉剂4.55kg/t(总加入量7.05kg/t)。
(2)LF精炼:对钢水进行升温至1620℃~1640℃、取样,根据成分微调成分,加入1.8kg/t石灰,喂入169kg铝线,再加入240kg碳化硅进行渣面脱氧,并加入低碳锰铁110kg、低碳铬铁107kg,低氮增碳剂10kg(成分同步骤(1))。LF末期继续采用Al线调整钢液中Al含量为0.043%。精炼炉渣成分如表2所示,LF出站钢液S含量为0.005%。
(3)RH真空脱气:提升气体流量100Nm3/h,极限真空度60Pa,高真空保持时间22min,破空后取样检测成分,喂入钛铁线30kg、再加入硼铁20kg,后喂入钙线18.5kg,不再喂入铝线,软吹23min后上钢浇铸。
(4)连铸:全程保护浇铸,恒拉速0.85m/min。
对比例1制备的钢材采用GB/T 10561标准A法进行非金属夹杂物检测,其评级为:A细0.5级、A粗0.0级、B细≤1.5级、B粗≤1.0级、C细≤0.0级、C粗≤0.0级、D细≤1.5级、D粗≤1.0级、Ds≤1.5级。成品S含量0.005%,轧材氧含量0.0009%。
对比例2
对比例2的LF脱氧剂种类与实施例不同,其余操作与实施例1实质相同。
成品熔炼成分:C:0.26%;Si:0.27%;Mn:1.33%,P:0.013%,S:0.005%,Cr:0.15%,Ni:0.003%,Cu:0.014%,Al:0.025%,Ti:0.030%,B:0.0021%,As:0.002%,Sn:0.002%,Ca:0.0006%,余量为Fe。
(1)转炉冶炼:转炉出钢量130t,终点C含量0.08%、S含量0.026%,出钢时依次加入脱氧剂铝饼1.3kg/t、硅锰合金1131kg、低碳锰铁1192kg、低碳铬铁62kg、低氮增碳剂50kg、以及石灰3.5kg/t和护炉剂4.55kg/t(总加入量8.05kg/t)。
(2)LF精炼:对钢水进行升温至1620℃~1640℃、取样,根据成分微调成分,喂入169kg铝线,再加入240kg电石(CaC2≥70%)进行渣面脱氧,并加入低碳锰铁110kg、低碳铬铁107kg,低氮增碳剂10kg(成分同步骤(1))。LF末期继续采用Al线调整钢液中Al含量为0.043%。精炼炉渣成分如表2所示,LF出站钢液S含量为0.005%。
(3)RH真空脱气:提升气体流量100Nm3/h,极限真空度60Pa,高真空保持时间22min,破空后取样检测成分,喂入钛铁线30kg、再加入硼铁20kg,后喂入钙线18.5kg,不再喂入铝线,软吹23min后上钢浇铸。
(4)连铸:全程保护浇铸,恒拉速0.85m/min。
对比例2制备的钢材采用GB/T 10561标准A法进行非金属夹杂物检测,其评级为:A细0.5级、A粗0.0级、B细≤1.0级、B粗≤0.5级、C细≤0.0级、C粗≤0.0级、D细≤1.5级、D粗≤1.0级、Ds≤1.5级。成品S含量0.005%,轧材氧含量0.0008%。
对比例3
对比例3的RH提升气体流量与实施例不同,其余操作与实施例1实质相同。
成品熔炼成分:C:0.26%;Si:0.27%;Mn:1.33%,P:0.013%,S:0.005%,Cr:0.15%,Ni:0.003%,Cu:0.014%,Al:0.025%,Ti:0.030%,B:0.0021%,As:0.002%,Sn:0.002%,Ca:0.0006%,余量为Fe。
(1)转炉冶炼:转炉出钢量130t,终点C含量0.08%、S含量0.026%,出钢时依次加入脱氧剂铝饼1.3kg/t、硅锰合金1131kg、低碳锰铁1192kg、低碳铬铁62kg、低氮增碳剂50kg、以及石灰3.5kg/t和护炉剂4.55kg/t(总加入量8.05kg/t)。
(2)LF精炼:对钢水进行升温至1620℃~1640℃、取样,根据成分微调成分,喂入169kg铝线,再加入240kg碳化硅进行渣面脱氧,并加入低碳锰铁110kg、低碳铬铁107kg,低氮增碳剂10kg(成分同步骤(1))。LF末期继续采用Al线调整钢液中Al含量为0.043%。精炼炉渣成分如表2所示,LF出站钢液S含量为0.005%。
(3)RH真空脱气:提升气体流量80Nm3/h,极限真空度60Pa,高真空保持时间22min,破空后取样检测成分,喂入钛铁线30kg、再加入硼铁20kg,后喂入钙线18.5kg,不再喂入铝线,软吹23min后上钢浇铸。
(4)连铸:全程保护浇铸,恒拉速0.85m/min。
对比例3制备的钢材采用GB/T 10561标准A法进行非金属夹杂物检测,其评级为:A细1.0级、A粗0.0级、B细≤1.5级、B粗≤1.5级、C细≤0.0级、C粗≤0.0级、D细≤1.0级、D粗≤1.0级、Ds≤1.0级。成品S含量0.005%,轧材氧含量0.0010%。
对比例4
对比例4的钙处理操作(不进行钙处理)与实施例1不同,其余操作与实施例实质相同。
成品熔炼成分:C:0.26%;Si:0.27%;Mn:1.33%,P:0.013%,S:0.005%,Cr:0.15%,Ni:0.003%,Cu:0.014%,Al:0.025%,Ti:0.030%,B:0.0021%,As:0.002%,Sn:0.002%,Ca:0.0003%,余量为Fe。
(1)转炉冶炼:转炉出钢量130t,终点C含量0.08%、S含量0.026%,出钢时依次加入脱氧剂铝饼1.3kg/t、硅锰合金1131kg、低碳锰铁1192kg、低碳铬铁62kg、低氮增碳剂50kg、以及石灰3.5kg/t和护炉剂4.55kg/t(总加入量8.05kg/t)。
(2)LF精炼:对钢水进行升温至1620℃~1640℃、取样,根据成分微调成分,喂入169kg铝线,再加入240kg碳化硅进行渣面脱氧,并加入低碳锰铁110kg、低碳铬铁107kg,低氮增碳剂10kg。LF末期继续采用Al线调整钢液中Al含量为0.043%。精炼炉渣成分如表2所示,LF出站钢液S含量为0.005%。
(3)RH真空脱气:提升气体流量100Nm3/h,极限真空度60Pa,高真空保持时间22min,破空后取样检测成分,喂入钛铁线30kg、再加入硼铁20kg,不进行钙处理,不再喂入铝线,软吹23min后上钢浇铸。
(4)连铸:全程保护浇铸,恒拉速0.85m/min。
对比例4制备的钢材采用GB/T 10561标准A法进行非金属夹杂物检测,其评级为:A细1.0级、A粗0.0级、B细≤2.0级、B粗≤1.0级、C细≤0.0级、C粗≤0.0级、D细≤1.5级、D粗≤1.0级、Ds≤1.0级。成品S含量0.005%,轧材氧含量0.0008%。
对比例5
对比例5的钙处理操作(过量钙处理)与实施例不同,其余操作与实施例1实质相同。
成品熔炼成分:C:0.26%;Si:0.27%;Mn:1.33%,P:0.013%,S:0.005%,Cr:0.15%,Ni:0.003%,Cu:0.014%,Al:0.025%,Ti:0.030%,B:0.0021%,As:0.002%,Sn:0.002%,Ca:0.0010%,余量为Fe。
(1)转炉冶炼:转炉出钢量130t,终点C含量0.08%、S含量0.026%,出钢时依次加入脱氧剂铝饼1.3kg/t、硅锰合金1131kg、低碳锰铁1192kg、低碳铬铁62kg、低氮增碳剂50kg、以及石灰3.5kg/t和护炉剂4.55kg/t(总加入量8.05kg/t)。
(2)LF精炼:对钢水进行升温至1620℃~1640℃、取样,根据成分微调成分,喂入169kg铝线,再加入240kg碳化硅进行渣面脱氧,并加入低碳锰铁110kg、低碳铬铁107kg,低氮增碳剂10kg。LF末期继续采用Al线调整钢液中Al含量为0.043%。精炼炉渣成分如表2所示,LF出站钢液S含量为0.005%。
(3)RH真空脱气:提升气体流量100Nm3/h,极限真空度60Pa,高真空保持时间22min,破空后取样检测成分,喂入钛铁线30kg、再加入硼铁20kg,后喂入钙线27.5kg,不再喂入铝线,软吹23min后上钢浇铸。
(4)连铸:全程保护浇铸,恒拉速0.85m/min。
对比例5制备的钢材采用GB/T 10561标准A法进行非金属夹杂物检测,其评级为:A细0.5级、A粗0.0级、B细≤1.0级、B粗≤0.5级、C细≤0.0级、C粗≤0.0级、D细≤1.5级、D粗≤1.0级、Ds≤1.5级。成品S含量0.005%,轧材氧含量0.0009%。
表1各实施例和对比例化学成分
类别 | C/% | Si/% | Mn/% | P/% | S/% | Cr/% | Al/% | Ti/% | B/% | Ca/% |
实施例1 | 0.26 | 0.27 | 1.33 | 0.013 | 0.005 | 0.15 | 0.025 | 0.030 | 0.0021 | 0.0006 |
实施例2 | 0.26 | 0.26 | 1.34 | 0.013 | 0.005 | 0.15 | 0.025 | 0.029 | 0.0022 | 0.0006 |
实施例3 | 0.26 | 0.27 | 1.33 | 0.013 | 0.005 | 0.15 | 0.025 | 0.030 | 0.0021 | 0.0006 |
对比例1 | 0.26 | 0.27 | 1.33 | 0.013 | 0.005 | 0.15 | 0.025 | 0.030 | 0.0021 | 0.0006 |
对比例2 | 0.26 | 0.27 | 1.33 | 0.013 | 0.005 | 0.15 | 0.025 | 0.030 | 0.0021 | 0.0006 |
对比例3 | 0.26 | 0.27 | 1.33 | 0.013 | 0.005 | 0.15 | 0.025 | 0.030 | 0.0021 | 0.0006 |
对比例4 | 0.26 | 0.27 | 1.33 | 0.013 | 0.005 | 0.15 | 0.025 | 0.030 | 0.0021 | 0.0003 |
对比例5 | 0.26 | 0.27 | 1.33 | 0.013 | 0.005 | 0.15 | 0.025 | 0.030 | 0.0021 | 0.0010 |
表2各实施例和对比例具体工艺
表3各实施例和对比例非金属夹杂物、O含量及成品疲劳寿命
Claims (3)
1.一种提高汽车空心稳定杆用钢洁净度的冶炼方法,其特征在于,所述冶炼方法步骤如下:
(1)转炉冶炼终点C含量控制在0.08%以上,出钢使用滑板和挡渣锥联合挡渣;
(2)转炉出钢先加铝进行脱氧,随后加入硅锰、低碳锰铁、低碳铬铁进行合金化,再一次性加入总量7.5~9kg/t的石灰、护炉剂进行造渣,LF精炼过程不再补加造渣料;
(3)LF钢水到站后迅速通电升温,采用SiC含量≥74%的粉状碳化硅进行渣面脱氧,造富含CO气体的还原发泡渣,将钢中S含量控制在≤0.005%,使用硅锰、低碳锰铁、低碳铬铁微调成分,将渣中FeO+MnO含量控制在0.85%以下,精炼炉渣碱度控制在2.5~4.5,精炼结束钢液中的Al含量控制为0.030~0.050%;
(4)RH提升气体流量96~120Nm3/h,≤67Pa高真空处理时间≥20min,破空后先喂入钛铁线、再加入硼铁,后进行少量钙处理,每炉钙线用量11.1~25.9kg,不再喂入铝线,软搅拌15min以上后吊包浇铸;
(5)连铸采用全程保护浇铸,保持恒拉速。
2.根据权利要求1所述的提高汽车空心稳定杆用钢洁净度的冶炼方法,其特征在于,所述步骤(2)和步骤(3)中所使用硅锰、低碳锰铁、低碳铬铁均为低碳低钙含量合金。
3.根据权利要求1所述方法冶炼得到的汽车空心稳定杆用钢,其特征在于,所述汽车空心稳定杆用钢按照质量百分比的组成为:C:0.24%~0.28%,Si:0.20%~0.30%,Mn:1.20%~1.40%,P≤0.020%,S≤0.005%,Cr:0.10%~0.18%,Ni≤0.20%,Cu≤0.10%,Al:0.020%~0.050%,Ti: 0.020%~0.040%,B:0.0015%~0.0035%,As≤0.030%,Sn≤0.030%,Ca≤0.0012%,O≤0.0018%,余量为Fe。
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