CN113025879B - 一种耐候桥梁钢及其冶炼方法 - Google Patents
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Abstract
本发明公开了一种耐候桥梁钢及其冶炼方法,涉及钢铁生产技术领域,其化学成分及质量百分比为:C:0.030%~0.080%,Si:0.10%~0.40%,Mn:1.50%~1.80%,P≤0.015%,S≤0.0010%,Nb:0.030%~0.050%,V:0.005%~0.050%,Ti:0.006%~0.020%,Cr:0.20%~0.80%,Ni:0.05%~0.20%,Mo≤0.05%,Cu:0.05%~0.20%,B≤0.0005%,Al:0.005%~0.015%,Mg:0.0008%~0.0015%,N≤0.0050%,余量为Fe和不可避免的杂质。采用顶底复吹转炉冶炼,经LF+RH精炼处理,镁处理有效降低夹杂尺寸,细化组织晶粒度,提高针状铁素体形成率,有效改善焊接性能,提升了钢板耐腐蚀性能。
Description
技术领域
本发明涉及钢铁生产技术领域,特别是涉及一种耐候桥梁钢及其冶炼方法。
背景技术
随着宏观经济转型发展,我国对钢结构桥梁等交通基础建设大力推进,桥梁结构产品用量突飞猛进。京沪高速、跨海、跨江大桥采用钢结构,地铁、轻轨工程、城市立交桥、高架桥、环保工程、城市公共设施关系到人身安全,因此,桥梁结构用钢对产品的质量要求越来越严格,桥梁用钢的钢水纯净度及焊接性是产品能否满足重点国家工程的关键。
发明内容
本发明针对上述技术问题,克服现有技术的缺点,提供一种耐候桥梁钢,其化学成分及质量百分比为:C:0.030%~0.080%,Si:0.10%~0.40%,Mn:1.50%~1.80%,P≤0.015%,S≤0.0010%,Nb:0.030%~0.050%,V:0.005%~0.050%,Ti:0.006%~0.020%,Cr:0.20%~0.80%,Ni:0.05%~0.20%,Mo≤0.05%,Cu:0.05%~0.20%,B≤0.0005%,Al:0.005%~0.015%,Mg:0.0008%~0.0015%,N≤0.0050%,余量为Fe和不可避免的杂质。
本发明进一步限定的技术方案是:
前所述的一种耐候桥梁钢,其化学成分及质量百分比为:C:0.030%~0.050%,Si:0.10%~0.20%,Mn:1.50%~1.70%,P≤0.013%,S≤0.0010%,Nb:0.030%~0.040%,V:0.005%~0.030%,Ti:0.006%~0.018%,Cr:0.20%~0.50%,Ni:0.05%~0.15%,Mo≤0.05%,Cu:0.05%~0.15%,B≤0.0005%,Al:0.005%~0.013%,Mg:0.0008%~0.0013%,N≤0.0050%,余量为Fe和不可避免的杂质。
前所述的一种耐候桥梁钢,其化学成分及质量百分比为:C:0.050%~0.070%,Si:0.20%~0.30%,Mn:1.60%~1.70%,P≤0.014%,S≤0.0010%,Nb:0.035%~0.045%,V:0.020%~0.040%,Ti:0.009%~0.020%,Cr:0.40%~0.60%,Ni:0.10%~0.15%,Mo≤0.05%,Cu:0.10%~0.15%,B≤0.0005%,Al:0.008%~0.015%,Mg:0.0010%~0.0015%,N≤0.0050%,余量为Fe和不可避免的杂质。
前所述的一种耐候桥梁钢,其化学成分及质量百分比为:C:0.060%~0.080%,Si:0.30%~0.40%,Mn:1.60%~1.80%,P≤0.012%,S≤0.0010%,Nb:0.040%~0.050%,V:0.030%~0.050%,Ti:0.010%~0.020%,Cr:0.60%~0.80%,Ni:0.15%~0.20%,Mo≤0.05%,Cu:0.15%~0.20%,B≤0.0005%,Al:0.010%~0.015%,Mg:0.0010%~0.0015%,N≤0.0050%,余量为Fe和不可避免的杂质。
本发明的另一目的在于提供一种耐候桥梁钢的冶炼方法,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、钼合金随废钢一起加入转炉,转炉出钢采用强脱氧模式进行脱氧,确保炉后铝含量满足0.030%~0.050%,硫含量≤0.010%;
S3、钢水到达LF炉后,调整钢包底吹氩气,氩气流量300~380NL/min,通电升温,采用石灰与铝丝进行化渣,炉渣白渣后取样分析,根据试样继续添加石灰与铝丝脱硫,脱硫结束后进行合金化处理,合金化结束后进行钢水定氧操作,氧含量≤5ppm,定氧结束后采用镁铝复合合金进行沉淀脱氧,并把钢水吊运至RH进行真空处理;
S4、钢水到达RH进行真空处理,真空保持时间8~12min,真空处理结束后吊运至连铸进行浇铸;
S5、连铸采用透气水口,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。
前所述的一种耐候桥梁钢的冶炼方法,步骤S3中,镁铝合金的镁含量为20%~30%。
本发明的有益效果是:
(1)本发明采用顶底复吹转炉冶炼,经LF+RH精炼处理,采用镁处理有效降低夹杂尺寸,解决了桥梁钢钢水洁净度问题,利用镁元素在钢水冶炼温度下高蒸气压低熔沸点的强化学活性,镁处理后生产细小弥散的镁系夹杂物,产品的晶粒度达到了11级以上,形成了以针状铁素为主的组织类型,改善了钢板韧性指标,提升了产品的焊接性能;
(2)本发明中通过镁质处理的钢水,钢中的全氧含量得到了有效降低;
(3)本发明中采用镁质处理的钢水,消除了钢中的硫化锰长条状夹杂物,生成了硫化镁球化夹杂物,改善了钢水质量;
(4)本发明中采用镁质处理的钢水,生成了细小弥散的纳米级别的MgO·Al2O3尖晶石,细小夹杂物成为轧制过程中组织转化的形核核心,形成了大量针状铁素体,有效提高产品韧性及焊接性能。
具体实施方式
实施例1
本实施例提供的一种耐候桥梁钢,其化学成分及质量百分比为:C:0.033%,Si:0.33%,Mn:1.73%,P:0.011%,S:0.0010%,Nb:0.0350%,V:0.035%,Ti:0.013%,Cr:0.77%,Ni:0.15%,Mo:0.03%,Cu:0.15%,B:0.0003%,Al:0.013%,Mg:0.0011%,N:0.0036%,余量为Fe和不可避免的杂质。
其冶炼方法包括以下步骤:
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、钼合金随废钢一起加入转炉,转炉出钢采用强脱氧模式进行脱氧,确保炉后铝含量满足0.042%,硫含量0.006%;
S3、钢水到达LF炉后,调整钢包底吹氩气,氩气流量360NL/min,通电升温,采用石灰与铝丝进行化渣,炉渣白渣后取样分析,根据试样继续添加石灰与铝丝脱硫,脱硫结束后进行合金化处理,合金化结束后进行钢水定氧操作,氧含量3ppm,定氧结束后采用镁铝复合合金进行沉淀脱氧,镁铝合金的镁含量为26%,并把钢水吊运至RH进行真空处理;
S4、钢水到达RH进行真空处理,真空保持时间11min,真空处理结束后吊运至连铸进行浇铸;
S5、连铸采用透气水口,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。
实施例2
本实施例提供的一种耐候桥梁钢,与实施例1的区别在于,其化学成分及质量百分比为:C:0.058%,Si:0.16%,Mn:1.66%,P:0.012%,S:0.0008%,Nb:0.033%,V:0.03%,Ti:0.012%,Cr:0.29%,Ni:0.03%,Mo:0.03%,Cu:0.11%,B:0.0002%,Al:0.010%,Mg:0.0013%,N:0.0041%,余量为Fe和不可避免的杂质。
实施例1和实施例2获得的钢板的夹杂情况如下表:
综上,本发明以产品设计为基础,在产品设计的基础上设计了独特的冶炼生产工艺,改变了传统的夹杂物形态,是以镁质脱氧为核心的新型制造方法。大型有害的夹杂物通过变性处理后,得到了不大于10μm的细小弥散夹杂物,试验发现这种细小弥散的夹杂物在组织转变的过程是良好的形核点,产品更容易形成针状铁素体,产品的晶粒度可以达到11级以上,提高了产品的韧性,大大改善了产品的焊接性能,保证了桥梁钢的使用性能。
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)
1.一种耐候桥梁钢,其特征在于:其化学成分及质量百分比为:C:0.030%~0.080%,Si:0.10%~0.40%,Mn:1.50%~1.80%,P≤0.015%,S≤0.0010%,Nb:0.030%~0.050%,V:0.005%~0.050%,Ti:0.006%~0.020%,Cr:0.20%~0.80%,Ni:0.05%~0.20%,Mo≤0.05%,Cu:0.05%~0.20%,B≤0.0005%,Al:0.005%~0.015%,Mg:0.0008%~0.0015%,N≤0.0050%,余量为Fe和不可避免的杂质;
冶炼方法包括以下步骤:
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、钼合金随废钢一起加入转炉,转炉出钢采用强脱氧模式进行脱氧,确保炉后铝含量满足0.030%~0.050%,硫含量≤0.010%;
S3、钢水到达LF炉后,调整钢包底吹氩气,氩气流量300~380NL/min,通电升温,采用石灰与铝丝进行化渣,炉渣白渣后取样分析,根据试样继续添加石灰与铝丝脱硫,脱硫结束后进行合金化处理,合金化结束后进行钢水定氧操作,氧含量≤5ppm,定氧结束后采用镁铝复合合金进行沉淀脱氧,并把钢水吊运至RH进行真空处理;
S4、钢水到达RH进行真空处理,真空保持时间8~12min,真空处理结束后吊运至连铸进行浇铸;
S5、连铸采用透气水口,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。
2.根据权利要求1所述的一种耐候桥梁钢,其特征在于:其化学成分及质量百分比为:C:0.030%~0.050%,Si:0.10%~0.20%,Mn:1.50%~1.70%,P≤0.013%,S≤0.0010%,Nb:0.030%~0.040%,V:0.005%~0.030%,Ti:0.006%~0.018%,Cr:0.20%~0.50%,Ni:0.05%~0.15%,Mo≤0.05%,Cu:0.05%~0.15%,B≤0.0005%,Al:0.005%~0.013%,Mg:0.0008%~0.0013%,N≤0.0050%,余量为Fe和不可避免的杂质。
3.根据权利要求1所述的一种耐候桥梁钢,其特征在于:其化学成分及质量百分比为:C:0.050%~0.070%,Si:0.20%~0.30%,Mn:1.60%~1.70%,P≤0.014%,S≤0.0010%,Nb:0.035%~0.045%,V:0.020%~0.040%,Ti:0.009%~0.020%,Cr:0.40%~0.60%,Ni:0.10%~0.15%,Mo≤0.05%,Cu:0.10%~0.15%,B≤0.0005%,Al:0.008%~0.015%,Mg:0.0010%~0.0015%,N≤0.0050%,余量为Fe和不可避免的杂质。
4.根据权利要求1所述的一种耐候桥梁钢,其特征在于:其化学成分及质量百分比为:C:0.060%~0.080%,Si:0.30%~0.40%,Mn:1.60%~1.80%,P≤0.012%,S≤0.0010%,Nb:0.040%~0.050%,V:0.030%~0.050%,Ti:0.010%~0.020%,Cr:0.60%~0.80%,Ni:0.15%~0.20%,Mo≤0.05%,Cu:0.15%~0.20%,B≤0.0005%,Al:0.010%~0.015%,Mg:0.0010%~0.0015%,N≤0.0050%,余量为Fe和不可避免的杂质。
5.根据权利要求1所述的一种耐候桥梁钢,其特征在于:所述步骤S3中,镁铝复合合金的镁含量为20%~30%。
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