CN112853218B - 一种高速动车转向架用钢及其制造方法 - Google Patents
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Abstract
本发明公开了一种高速动车转向架用钢及其制造方法,涉及钢铁生产技术领域,其化学成分及质量百分比如下:C:0.11%~0.15%,Si:0.10%~0.30%,Mn:1.40%~1.50%,P≤0.013%,S≤0.0050%,Ni:0.10%~0.20%,Cr:0.10%~0.30%,Cu:0.10%~0.20%,Nb:0.030%~0.050%,Mo≤0.10%,V:0.01%~0.04%,Ti:0.006%~0.015%,Al:0.005%~0.015%,Mg:0.0008%~0.0015%,N:0.0050%,余量为Fe及不可避免的杂质。获得以铁素体、珠光体为主的组织,有效球化了硫化物夹杂、改性了钙铝酸盐夹杂物,获得的细小的夹杂物强化了组织性能,满足了产品高疲劳寿命、焊接性能要求。
Description
技术领域
本发明涉及钢铁生产技术领域,特别是涉及一种高速动车转向架用钢及其制造方法。
背景技术
随着我国经济进程加速,铁路运输得到了飞速的发展,车辆车速得到了大幅度的提高,其中大于300公里/小时的车辆已经成为主要的人员运输方式。高速铁路的发展的离不开高质量钢铁的应用,其中高速动车转向架用钢一直是高速动车的核心配件,其性能要求较高的抗疲劳性能及焊接性能。目前,我国高速动车转向架用钢主要依赖进口,提高钢材质量,完成高端产品的国产替代,实现大国重器的核心技术势在必行。
发明内容
本发明针对上述技术问题,克服现有技术的缺点,提供一种高速动车转向架用钢,其化学成分及质量百分比如下:C:0.11%~0.15%,Si:0.10%~0.30%,Mn:1.40%~1.50%,P≤0.013%,S≤0.0050%,Ni:0.10%~0.20%,Cr:0.10%~0.30%,Cu:0.10%~0.20%,Nb:0.030%~0.050%,Mo≤0.10%,V:0.01%~0.04%,Ti:0.006%~0.015%,Al:0.005%~0.015%,Mg:0.0008%~0.0015%,N≤0.0050%,余量为Fe及不可避免的杂质。
本发明进一步限定的技术方案是:
前所述的一种高速动车转向架用钢,其化学成分及质量百分比如下:C:0.11%~0.13%,Si:0.10%~0.29%,Mn:1.40%~1.48%,P≤0.012%,S≤0.0030%,Ni:0.10%~0.19%,Cr:0.10%~0.29%,Cu:0.10%~0.19%,Nb:0.030%~0.049%,Mo≤0.10%,V:0.01%~0.39%,Ti:0.006%~0.013%,Al:0.005%~0.013%,Mg:0.0008%~0.0013%,N≤0.0040%,余量为Fe及不可避免的杂质。
前所述的一种高速动车转向架用钢,其化学成分及质量百分比如下:C:0.13%~0.15%,Si:0.11%~0.30%,Mn:1.42%~1.50%,P≤0.011%,S≤0.0030%,Ni:0.11%~0.20%,Cr:0.11%~0.30%,Cu:0.11%~0.20%,Nb:0.031%~0.050%,Mo≤0.10%,V:0.011%~0.040%,Ti:0.009%~0.015%,Al:0.006%~0.015%,Mg:0.0009%~0.0015%,N≤0.0048%,余量为Fe及不可避免的杂质。
前所述的一种高速动车转向架用钢,其化学成分及质量百分比如下:C:0.12%~0.14%,Si:0.15%~0.25%,Mn:1.43%~1.48%,P≤0.010%,S≤0.0030%,Ni:0.12%~0.18%,Cr:0.15%~0.25%,Cu:0.13%~0.18%,Nb:0.035%~0.045%,Mo≤0.10%,V:0.020%~0.030%,Ti:0.008%~0.013%,Al:0.006%~0.013%,Mg:0.0009%~0.0013%,N≤0.0049%,余量为Fe及不可避免的杂质。
本发明的另一目的在于提供一种高速动车转向架用钢的制造方法,包括以下步骤:
S1、铁水采用KR法进行脱硫预处理,扒渣后入转炉吹炼;
S2、采用顶底复吹方式进行吹炼,镍、铜合金随废钢一起加入转炉,转炉出钢采用出钢脱氧合金化操作,钢水覆盖钢包底部后加入高纯石墨碳材脱氧,随后加入预熔精炼渣4~5kg/t钢,杂灰0.8~1.6kg/t钢,最后加入高碳铬铁、锰铁、硅铁及铝块;出钢结束后氩气流量调整到500~600NL/min,保证渣面及合金全部熔化,渣面熔化后向渣面喂入纯钙线,去除炉渣中气体,处理结束后钢水吊运至LF炉;
S3、钢水吊运LF炉后进行升温处理,保证钢水温度到达1620~1640℃,然后向钢包底部喂入铝线,对钢水进行脱氧,钢水定氧<10ppm后进行炉渣微脱氧处理,保证硫含量满足成分要求,对钢水进行合金化处理;
S4、钢水到达RH进行真空处理,真空保持时间≥15min,真空结束后进行钢水定氧,确保钢水氧含量≤5ppm,钢包到喂丝位喂入镁铝线处理,镁处理结束后静搅时间≥12min;
S5、钢水静搅后吊运至连铸进行浇铸,采用透气水口,保证浇铸顺利,采用电磁搅拌及动态轻压下工艺,坯料堆冷48小时后检查表面质量并进行处理,保证符合要求;
S6、坯料加热温度1120±10℃,加热时间按坯料厚度以10~13min/cm计算,均热时间≥40min,确保合金中元素充分固溶;
S7、采用单机架可逆轧机进行轧制,出轧开轧1000~1050℃,二开温度850~980℃,终轧温度800~900℃;
S8、钢板入水温度700~800℃,返红温度500~600℃,冷却辊速0.50~1.20m/s,加速度0.002~0.013m/s2。
前所述的一种高速动车转向架用钢的制造方法,步骤S3中,炉渣微脱氧过程中不加入铝系脱氧剂。
前所述的一种高速动车转向架用钢的制造方法,步骤S4中,镁铝线的镁含量为10%~15%,镁处理结束后镁含量为0.0010%~0.0020%。
本发明的有益效果是:
(1)本发明采用吹氧转炉冶炼并经LF+RH精炼处理,采用镁铝线进行真空后处理,镁处理后静搅镇静,经连铸浇铸、奥氏体化、热机械轧制及冷却工艺,获得以铁素体、珠光体为主的组织,有效球化了硫化物夹杂、改性了钙铝酸盐夹杂物,获得的细小的夹杂物强化了组织性能,满足了产品高疲劳寿命、焊接性能要求,满足了客户要求;
(2)本发明采用镁处理替代钙处理工艺,通过镁的活度效应降低了钢水总氧含量,改善了钢中A、B类夹杂物形态,细化了组织晶粒度,得到了以铁素体珠光体为主的组织形态,提高产品的抗疲劳及焊接性能;
(3)本发明采用KR法工艺,保证了入炉铁水硫的稳定性,采用自产废钢避免了外来增硫条件,通过转炉高温出钢及全脱氧高温化渣工艺,炉后底搅工艺及化渣技术得到了转炉去硫工艺的实现;
(4)本发明中LF独特处理过程稳定了钢水铝含量,避免了夹杂物转化,保证了钢水以Al2O3固态夹杂物为主的夹杂物形态;
(5)本发明中高真空条件降低了钢水中游离氧含量,通过镁处理有效去除了钢水中含氧复合夹杂物中的氧,保证了夹杂物的变形,得到大多数小于10μm的夹杂物,夹杂物在钢中变害为益;
(6)本发明采用镁系成分的钢板,在组织转化过程中,镁质改质的析出物,成为了非均质形核核心,分割晶粒、细化组织、改善性能;
(7)本发明中镁处理后,钢中溶解氧含量得到明显降低,与铝系夹杂形成镁铝尖晶石类夹杂物,细小弥散在钢的基体中,提升钢的强度与质量,镁与硫结合形成MgS夹杂物,有效球化了A类夹杂物,改善了MnS夹杂物对钢材性能的危害;
(8)本发明采用镁质合金添加,有效细化了组织晶粒度,促进了针状铁素的形成,带状组织得到了明细改善,铁素体珠光体组织晶粒更均匀。
附图说明
图1为本发明实施例1的金相组织图。
具体实施方式
实施例1
本实施例提供的一种高速动车转向架用钢,其化学成分及质量百分比如下:C:0.11%,Si:0.13%,Mn:1.42%,P:0.011%,S:0.0013%,Ni:0.13%,Cr:0.13%,Cu:0.11%,Nb:0.033%,Mo:0.02%,V:0.013%,Ti:0.011%,Al:0.009%,Mg:0.0009%,N:0.0037%,余量为Fe及不可避免的杂质。
制造方法,包括以下步骤:
S1、铁水采用KR法进行脱硫预处理,扒渣后入转炉吹炼;
S2、采用顶底复吹方式进行吹炼,镍、铜合金随废钢一起加入转炉,转炉出钢采用出钢脱氧合金化操作,钢水覆盖钢包底部后加入高纯石墨碳材脱氧,随后加入预熔精炼渣4.5kg/t钢,杂灰1.2kg/t钢,最后加入高碳铬铁、锰铁、硅铁及铝块;出钢结束后氩气流量调整到560NL/min,保证渣面及合金全部熔化,渣面熔化后向渣面喂入纯钙线,去除炉渣中气体,处理结束后钢水吊运至LF炉;
S3、钢水吊运LF炉后进行升温处理,保证钢水温度到达1631℃,然后向钢包底部喂入铝线,对钢水进行脱氧,钢水定氧6ppm后进行炉渣微脱氧处理,炉渣微脱氧过程中不加入铝系脱氧剂,保证硫含量满足成分要求,对钢水进行合金化处理;
S4、钢水到达RH进行真空处理,真空保持时间16min,真空结束后进行钢水定氧,确保钢水氧含量2ppm,钢包到喂丝位喂入镁铝线处理,镁铝线的镁含量为13%,镁处理结束后静搅时间15min,镁处理结束后镁含量为0.0018%;
S5、钢水静搅后吊运至连铸进行浇铸,采用透气水口,保证浇铸顺利,采用电磁搅拌及动态轻压下工艺,坯料堆冷48小时后检查表面质量并进行处理,保证符合要求;
S6、坯料加热温度1126℃,加热时间260min,均热时间43min,确保合金中元素充分固溶;
S7、采用单机架可逆轧机进行轧制,出轧开轧1035℃,二开温度898℃,终轧温度836℃;
S8、钢板入水温度787℃,返红温度565℃,冷却辊速0.95m/s,加速度0.009m/s2。
实施例2
本实施例提供的一种高速动车转向架用钢,与实施例1的区别在于,其化学成分及质量百分比如下:C:0.14%,Si:0.26%,Mn:1.46%,P:0.010%,S:0.0019%,Ni:0.19%,Cr:0.27%,Cu:0.17%,Nb:0.048%,Mo:0.02%,V:0.036%,Ti:0.013%,Al:0.0013%,Mg:0.0013%,N:0.0041%,余量为Fe及不可避免的杂质。
实施例3
本实施例提供的一种高速动车转向架用钢,与实施例1的区别在于,其化学成分及质量百分比如下:C:0.13%,Si:0.21%,Mn:1.43%,P:0.008%,S:0.0016%,Ni:0.15%,Cr:0.18%,Cu:0.11%,Nb:0.038%,Mo:0.10%,V:0.033%,Ti:0.011%,Al:0.0012%,Mg:0.0015%,N:0.0048%,余量为Fe及不可避免的杂质。
实施例1-3所得钢板的力学性能测试结果如下表1:
表1各实施例产品力学性能检测结果
实施例1-3所得钢板的夹杂物情况如下表2:
表2各实施例产品夹杂物情况
实施例 | A类 | B类 | C类 | D类 |
1 | 0 | 0.5 | 0 | 0 |
2 | 0 | 0 | 0 | 0 |
3 | 0 | 0.5 | 0 | 0 |
由此可见,本发明以提升产品洁净度为基础,以细化组织晶粒度提升产品性能为根本,对疲劳寿命、夹杂物、焊接性能、折弯性能、带状组织控制、晶粒度、耐候性能等进行了全面提升,全面对标国际先进产品,采用镁微合金化技术,改善内生夹杂物的形态,从而提高产品的内部质量,改善奥氏体形核机理,有效细化组织晶粒度,得到了以铁素体+珠光体为主的组织形态,从而提高产品的内部质量,改善产品性能。
除上述实施例外,本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案,均落在本发明要求的保护范围。
Claims (5)
1.一种高速动车转向架用钢,其特征在于:其化学成分及质量百分比如下:C:0.11%~0.15%,Si:0.10%~0.30%,Mn:1.40%~1.50%,P≤0.013%,S≤0.0050%,Ni:0.10%~0.20%,Cr:0.10%~0.30%,Cu:0.10%~0.20%,Nb:0.030%~0.050%,Mo≤0.10%,V:0.01%~0.04%,Ti:0.006%~0.015%,Al:0.005%~0.015%,Mg:0.0008%~0.0015%,N≤0.0050%,余量为Fe及不可避免的杂质;
制造方法包括以下步骤:
S1、铁水采用KR法进行脱硫预处理,扒渣后入转炉吹炼;
S2、采用顶底复吹方式进行吹炼,镍、铜合金随废钢一起加入转炉,转炉出钢采用出钢脱氧合金化操作,钢水覆盖钢包底部后加入高纯石墨碳材脱氧,随后加入预熔精炼渣4~5kg/t钢,杂灰0.8~1.6kg/t钢,最后加入高碳铬铁、锰铁、硅铁及铝块;出钢结束后氩气流量调整到500~600NL/min,保证渣面及合金全部熔化,渣面熔化后向渣面喂入纯钙线,去除炉渣中气体,处理结束后钢水吊运至LF炉;
S3、钢水吊运LF炉后进行升温处理,保证钢水温度到达1620~1640℃,然后向钢包底部喂入铝线,对钢水进行脱氧,钢水定氧<10ppm后进行炉渣微脱氧处理,保证硫含量满足成分要求,对钢水进行合金化处理;
S4、钢水到达RH进行真空处理,真空保持时间≥15min,真空结束后进行钢水定氧,确保钢水氧含量≤5ppm,钢包到喂丝位喂入镁铝线处理,镁处理结束后静搅时间≥12min;
S5、钢水静搅后吊运至连铸进行浇铸,采用透气水口,保证浇铸顺利,采用电磁搅拌及动态轻压下工艺,坯料堆冷48小时后检查表面质量并进行处理,保证符合要求;
S6、坯料加热温度1120±10℃,加热时间按坯料厚度以10~13min/cm计算,均热时间≥40min,确保合金中元素充分固溶;
S7、采用单机架可逆轧机进行轧制,粗轧开轧1000~1050℃,二开温度850~980℃,终轧温度800~900℃;
S8、钢板入水温度700~800℃,返红温度500~600℃,冷却辊速0.50~1.20m/s,加速度0.002~0.013m/s²。
2.根据权利要求1所述的一种高速动车转向架用钢,其特征在于:其化学成分及质量百分比如下:C:0.13%~0.15%,Si:0.11%~0.30%,Mn:1.42%~1.50%,P≤0.011%,S≤0.0030%,Ni:0.11%~0.20%,Cr:0.11%~0.30%,Cu:0.11%~0.20%,Nb:0.031%~0.050%,Mo≤0.10%,V:0.011%~0.040%, Ti:0.009%~0.015%,Al:0.006%~0.015%,Mg:0.0009%~0.0015%,N≤0.0048%,余量为Fe及不可避免的杂质。
3.根据权利要求1所述的一种高速动车转向架用钢,其特征在于:其化学成分及质量百分比如下:C:0.12%~0.14%,Si:0.15%~0.25%,Mn:1.43%~1.48%,P≤0.010%,S≤0.0030%,Ni:0.12%~0.18%,Cr:0.15%~0.25%,Cu:0.13%~0.18%,Nb:0.035%~0.045%,Mo≤0.10%,V:0.020%~0.030%, Ti:0.008%~0.013%,Al:0.006%~0.013%,Mg:0.0009%~0.0013%,N≤0.0049%,余量为Fe及不可避免的杂质。
4.根据权利要求1所述的一种高速动车转向架用钢,其特征在于:所述步骤S3中,炉渣微脱氧过程中不加入铝系脱氧剂。
5.根据权利要求1所述的一种高速动车转向架用钢,其特征在于:所述步骤S4中,所述镁铝线的镁含量为10%~15%,镁处理结束后镁含量为0.0010%~0.0020%。
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