CN113136522B - 用氩氧炉冶炼含钛奥氏体不锈钢工艺 - Google Patents
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Abstract
本发明涉及一种用氩氧炉冶炼含钛奥氏体不锈钢的工艺,采用“感应炉~氩氧炉~炉外精炼~真空脱气~炉外精炼~浇注”的工艺路线,按照一定比例在感应炉熔化优质返回料、高碳铬铁、电解镍、钼铁,温度合适后出钢,兑入氩氧炉内;氩氧炉根据取样结果补加合金及石灰,吹氧脱碳至0.06%以下,随后加硅铁还原,加金属锰整锰,最后加铌铁铁调整铌含量,温度成分合适后出钢,出钢后转炉外精炼工位,加铝粉、硅钙粉脱氧将除钛以外的所有合金调整完毕转真空脱气工位除气;真空脱气工位脱气处理,脱气结束后转炉外精炼工位;转炉外精炼工位喂钛铁线调整钛含量,弱搅拌结束后吊包浇注;在氩气保护气氛下浇注成型,适用于利用氩氧炉冶炼控氮的含钛奥氏体不锈钢。
Description
技术领域
本发明属于炼钢技术领域,涉及一种用氩氧炉冶炼含钛奥氏体不锈钢工艺。
背景技术
含钛奥氏体不锈钢广泛应用与对晶界腐蚀性要求高的化学、煤炭、石油产业的运输管道,也常用作生产各种常规武器、枪管、炮弹等。
在该钢种中含有含量较高的钛,而钛容易与钢中的氮结合,形成氮化钛杂质而影响钢的质量,目前,多数工艺路线没有控氮措施;钛由于非常容易烧损,回收率不稳定。
发明内容
本发明的目的在于克服现有技术中存在的不足而提供一种用氩氧炉冶炼含钛奥氏体不锈钢的工艺。
为了实现上述目的,本发明采用如下技术方案:
一种用氩氧炉冶炼含钛奥氏体不锈钢工艺,采用“感应炉~氩氧炉~炉外精炼~真空脱气~炉外精炼~浇注”的工艺路线,不锈钢成分按照质量百分比控制如下:[C]:0.08~0.011%,[Si]:0.40~0.70%,[Mn]≤2.00%,[P]≤0.020%,[S]≤0.015%,[Ni]:9.00~10.00%,[Cr]:18.00~19.00%,[Nb]:0.07~0.10%,[Ti]:0.45~0.80%,[N]≤0.018%,其余为Fe,具体冶炼工艺的步骤如下:
步骤1)、在感应炉内熔化含P≤0.012%的优质料头550~620kg/t、高碳铬铁300~350kg/t、电解镍80~90kg/t、钼铁8~10kg/t,温度控制在1560~1580℃之间取样,出钢温度控制在1600~1620℃之间,之后兑入氩氧炉内;所使用料头必须无油污、无锈蚀;
步骤2)、氩氧炉根据取样结果补加合金0-40kg/t及石灰10-12kg/t,吹氧脱碳至0.06%以下,温度控制在1650~1700℃之间,根据Cr烧损情况加入5~25kg/t的硅铁进行还原,还原结束后加18~20kg/t的金属锰调整锰含量,最后加1-2kg/t的铌铁调整铌含量;
吹氩搅拌3~5分钟后,拔渣80%以上,加石灰10kg/t、萤石5kg/t和铝3kg/t进行二次还原,吹氩搅拌2~3分钟后取样分析化成成分,控制[C]≤0.08%,[Si]≤0.10~0.15%,[Mn]:1.40~1.80%,[P]≤0.018%,[S]≤0.010%,[Ni]:9.00~10.00%,[Cr]:18.00~19.00%,控制温度在1560~1620℃之间出钢;
步骤3)、出钢后转炉外精炼工位,期间加入硅钙粉和Al粒1~2kg/t,其中硅钙粉与Al粒之间的比例1:1,保持还原气氛,控制温度在1600~1630℃之间;脱氧将除钛以外的所有合金调整完毕转真空脱气工位除气;
步骤4)、进行真空脱气工位脱气处理,在真空度≤0.7mbar下保持时间≥15分钟,破空后在线定氢控制[N]≤150ppm,脱气结束后转炉外精炼工位;
步骤5)、除气后再次转炉外精炼调整钛含量,喂钛铁线10~25m/t,喂线温度控制在1560~1580℃之间;出钢温度控制在1510~1520℃之间,弱搅拌时间≥15min;弱搅拌结束后吊包浇注;
步骤6)、在氩气保护气氛下浇注成型,具体是采用模内充氩及氩气保护下进行浇注,镇静时间≥10分钟,开浇温度控制在1500~1510℃,开浇后按1~2.0kg/t加入超低碳保护渣,保护渣使用前要充分干燥;浇注上冒口2/3后加入发热剂0.5~1kg/t,浇完补加碳化稻壳0.5~1kg/t保温,确保补缩效果。
本发明的技术方案产生的积极效果如下:可以将钢中的氮含量控制在较低的水平180ppm以内,氮化钛夹杂稳定控制在2.5级以内,钛的回收率可以达到80%以上。
具体实施方式
实施例:本发明采用“感应炉~氩氧炉~炉外精炼~真空脱气~炉外精炼~浇注”的工艺路线,不锈钢成分按照质量百分比控制如下:[C]:0.08~0.011%,[Si]:0.40~0.70%,[Mn]≤2.00%,[P]≤0.020%,[S]≤0.015%,[Ni]:9.00~10.00%,[Cr]:18.00~19.00%,[Nb]:0.07~0.10%,[Ti]:0.45~0.80%,[N]≤0.018%,其余为Fe和微量残余元素,具体冶炼工艺的步骤如下:
步骤1)、在感应炉内熔化质量百分比P≤0.012%的优质料头550~620kg/t、高碳铬铁300~350kg/t、电解镍80~90kg/t、钼铁8~10kg/t,温度控制在1560~1580℃取样,出钢温度控制在1600~1620℃;所使用料头必须无油污、无锈蚀,配料时根据具体使用料头的所含合金量,适当增加或者减去相应数的合金量;
步骤2)、氩氧炉根据取样结果补加合金0-40kg/t及石灰10-12kg/t,吹氧脱碳至0.06%以下,温度控制在1650~1700℃之间,根据Cr烧损情况计算加入5~25kg/t硅铁进行还原,加入18~20kg/t金属锰进行整锰,吹氩搅拌3~5分钟后,拔渣80%以上,加石灰10kg/t,萤石5kg/t和铝3kg/t二次还原,吹氩搅拌2~3分钟后取样分析化成成分,控制[C]≤0.08%,[Si]:0.10~0.15%,[Mn]:1.40~1.80%,[P]≤0.018%,[S]≤0.010%,[Ni]:9.00~10.00%,[Cr]:18.00~19.00%,控制温度1560~1620℃出钢;
步骤3)、出钢后转炉外精炼工位,期间加入硅钙粉、Al粒1~2kg/t,硅钙粉与Al粒之间的比例1:1,保持还原气氛,控制温度1600~1630℃;脱氧将除钛以外的所有合金调整完毕转真空脱气工位除气;
步骤4)、进行真空脱气工位脱气处理,在真空度≤0.7mbar下保持时间≥15分钟,破空后在线定氢控制[N]≤150ppm,脱气结束后转炉外精炼工位;
步骤5)、除气后再次转炉外精炼调整钛含量,喂钛铁线20m/t,喂线温度控制在1560~1580℃之间;出钢温度控制在1510~1520℃之间,弱搅拌时间≥15min;弱搅拌结束后吊包浇注;
步骤6)、在氩气保护气氛下浇注成型,具体是采用模内充氩及氩气保护下进行浇注,镇静时间≥10分钟,开浇温度控制在1500~1510℃之间,开浇后按1~2.0kg/t加入超低碳保护渣,保护渣使用前要充分干燥;浇注上冒口2/3后加入发热剂0.5~1kg/t,浇完补加碳化稻壳0.5~1kg/t保温,确保补缩效果。
根据本实施例的冶炼工艺进行了两组冶炼,两组冶炼得到的产品的化学成分含量表1中,均符合目标要求:
表1化学成分m%
本冶炼工艺仅适用于利用氩氧炉冶炼控氮的含钛奥氏体不锈钢。
Claims (1)
1.一种用氩氧炉冶炼含钛奥氏体不锈钢工艺,其特征在于,采用“感应炉~氩氧炉~炉外精炼~真空脱气~炉外精炼~浇注”的工艺路线,不锈钢成分按照质量百分比控制如下:[C]:0.08~0.011%,[Si]:0.40~0.70%,[Mn]≤2.00%,[P]≤0.020%,[S]≤0.015%,[Ni]:9.00~10.00%,[Cr]:18.00~19.00%,[Nb]:0.07~0.10%,[Ti]:0.45~0.80%,[N]≤0.018%,其余为Fe,具体冶炼工艺的步骤如下:
步骤1)、在感应炉内熔化含P≤0.012%的优质料头550~620kg/t、高碳铬铁300~350kg/t、电解镍80~90kg/t、钼铁8~10kg/t,温度控制在1560~1580℃之间取样,出钢温度控制在1600~1620℃之间,之后兑入氩氧炉内;所使用料头必须无油污、无锈蚀;
步骤2)、氩氧炉根据取样结果补加合金0-40kg/t及石灰10-12kg/t,吹氧脱碳至0.06%以下,温度控制在1650~1700℃之间,根据Cr烧损情况加入5~25kg/t的硅铁进行还原,还原结束后加入18~20kg/t的金属锰进行调整锰含量,最后加入1-2kg/t的铌铁调整铌含量;
吹氩搅拌3~5分钟后,拔渣80%以上,加石灰10kg/t、萤石5kg/t和铝3kg/t进行二次还原,吹氩搅拌2~3分钟后取样分析化成成分,控制[C]≤0.08%,[Si]:0.10~0.15%,[Mn]:1.40~1.80%,[P]≤0.018%,[S]≤0.010%,[Ni]:9.00~10.00%,[Cr]:18.00~19.00%,控制温度在1560~1620℃之间出钢;
步骤3)、出钢后转炉外精炼工位,期间加入硅钙粉和Al粒1~2kg/t,其中硅钙粉与Al粒之间的重量比为1:1,保持还原气氛,控制温度在1600~1630℃之间;脱氧将除钛以外的所有合金调整完毕转真空脱气工位除气;
步骤4)、进行真空脱气工位脱气处理,在真空度≤0.7mbar下保持时间≥15分钟,破空后在线定氢控制[N]≤150ppm,脱气结束后转炉外精炼工位;
步骤5)、除气后再次转炉外精炼调整钛含量,喂钛铁线10~25m/t,喂线温度控制在1560~1580℃之间;出钢温度控制在1510~1520℃之间,弱搅拌时间≥15min;弱搅拌结束后吊包浇注;
步骤6)、在氩气保护气氛下浇注成型,具体是采用模内充氩及氩气保护下进行浇注,镇静时间≥10分钟,开浇温度控制在1500~1510℃之间,开浇后按1~2.0kg/t加入超低碳保护渣,保护渣使用前要充分干燥;浇注上冒口2/3后加入发热剂0.5~1kg/t,浇完补加碳化稻壳0.5~1kg/t保温,确保补缩效果。
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