CN113025880B - 一种500MPa级耐候桥梁钢及其制造方法 - Google Patents
一种500MPa级耐候桥梁钢及其制造方法 Download PDFInfo
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Abstract
本发明公开了一种500MPa级耐候桥梁钢及其制造方法,涉及钢铁生产技术领域,其化学成分及质量百分比如下:C:0.04%~0.06%,Si:0.20%~0.40%,Mn:1.50%~1.70%,P:0.010%~0.015%,S≤0.0010%,Nb:0.030%~0.050%,V:0.020%~0.040%,Ti:0.006%~0.020%,Cr:0.55%~0.65%,Ni:0.20%~0.30%,Mo:0.08%~0.15%,Cu:0.22%~0.30%,B≤0.0005%,Al:0.015%~0.030%,Mg:0.0008%~0.0015%,N≤0.0050%,I≥6.5%,不添加Ca,余量为Fe和不可避免的杂质。形成以针状铁素体为主的组织,提高产品强度与韧性,改善焊接性能,提高耐候性能。
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500MPa级耐候桥梁钢及其制造方法。
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500MPa级耐候桥梁钢,其化学成分及质量百分比如下:C:0.04%~0.06%,Si:0.20%~0.40%,Mn:1.50%~1.70%,P:0.010%~0.015%,S≤0.0010%,Nb:0.030%~0.050%,V:0.020%~0.040%,Ti:0.006%~0.020%,Cr:0.55%~0.65%,Ni:0.20%~0.30%,Mo:0.08%~0.15%,Cu:0.22%~0.30%,B≤0.0005%,Al:0.015%~0.030%,Mg:0.0008%~0.0015%,N≤0.0050%,I≥6.5%,不添加Ca,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500MPa级耐候桥梁钢,其化学成分及质量百分比如下:C:0.04%~0.055%,Si:0.20%~0.30%,Mn:1.50%~1.60%,P:0.010%~0.013%,S≤0.0010%,Nb:0.030%~0.040%,V:0.020%~0.030%,Ti:0.006%~0.020%,Cr:0.55%~0.60%,Ni:0.20%~0.25%,Mo:0.08%~0.13%,Cu:0.22%~0.39%,B≤0.0005%,Al:0.015%~0.029%,Mg:0.0008%~0.0013%,N≤0.0050%,I≥6.5%,不添加Ca,余量为Fe和不可避免的杂质。
前所述的一种500MPa级耐候桥梁钢,其化学成分及质量百分比如下:C:0.04%~0.06%,Si:0.25%~0.35%,Mn:1.55%~1.65%,P:0.011%~0.015%,S≤0.0010%,Nb:0.035%~0.045%,V:0.025%~0.035%,Ti:0.009%~0.018%,Cr:0.56%~0.63%,Ni:0.22%~0.29%,Mo:0.10%~0.15%,Cu:0.23%~0.28%,B≤0.0005%,Al:0.016%~0.029%,Mg:0.0009%~0.0013%,N≤0.0050%,I≥6.5%,不添加Ca,余量为Fe和不可避免的杂质。
前所述的一种500MPa级耐候桥梁钢,其化学成分及质量百分比如下:C:0.042%~0.06%,Si:0.30%~0.40%,Mn:1.60%~1.70%,P:0.011%~0.015%,S≤0.0010%,Nb:0.040%~0.050%,V:0.030%~0.040%,Ti:0.010%~0.020%,Cr:0.60%~0.65%,Ni:0.25%~0.30%,Mo:0.10%~0.15%,Cu:0.23%~0.30%,B≤0.0005%,Al:0.020%~0.030%,Mg:0.0010%~0.0015%,N≤0.0050%,I≥6.5%,不添加Ca,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500MPa级耐候桥梁钢的制造方法,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、使用自产低硫废钢,镍、铜、钼合金随废钢一起加入转炉,出钢温度1640~1680℃,添加锰铁、硅铁及铝块进行出钢合金化操作,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,去除炉渣中气体含量,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,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20min,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≥15min;
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;
S6、坯料加热温度1130±10℃,加热时间按坯料厚度计算为10~13min/cm,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780~880℃,终轧温度750~850℃;
S8、钢板入水温度740~800℃,返红温度350~550℃,冷却辊速0.30~1.00m/s,加速度0.002~0.013m/s2;
S9、钢板剪切后进行回火处理,回火温度300~800℃,回火后空冷至室温,钢板表检合格后入库。
前所述的一种500MPa级耐候桥梁钢的制造方法,步骤S4中,镁铝线的镁含量为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,精炼处理后采用微合金化技术细化夹杂物、降低原始奥氏体晶粒度,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,形成了以铁素体、珠光体为主的多相均匀化组织类型,提高产品强度与韧性,改善焊接性能;
(2)本发明中采用KR脱硫技术及转炉与CAS工艺处理,有效降低了CAS炉炉后硫含量;
(3)本发明中LF采用快速脱硫技术,减少了大型夹杂物的形成,减少了钙铝酸盐夹杂物的大量聚集;
(4)本发明中通过高真空处理技术,有效降低了钢水中氧的浓度积,在低氧含量的钢水条件下进行镁处理技术,促进了钢水中含氧夹杂物的变性,降低了夹杂物的尺寸;
(5)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;
(6)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与珠光体组织,有效提高产品韧性及焊接性能;
(7)通过TMCP轧制工艺及回火处理,满足钢板的强韧性要求及钢板内应力的去除,满足了客户的使用要求。
附图说明
图1为本发明实施例1钢板的金相组织图。
具体实施方式
实施例1
本实施例提供的一种500MPa级耐候桥梁钢,其化学成分及质量百分比如下:C:0.046%,Si:0.27%,Mn:1.57%,P:0.011%,S:0.0008%,Nb:0.033%,V:0.026%,Ti:0.013%,Cr:0.59%,Ni:0.23%,Mo:0.09%,Cu:0.29%,B:0.0001%,Al:0.019%,Mg:0.0013%,N:0.0041%,I≥6.5%,不添加Ca,余量为Fe和不可避免的杂质。
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、使用自产低硫废钢,镍、铜、钼合金随废钢一起加入转炉,出钢温度1653℃,添加锰铁、硅铁及铝块进行出钢合金化操作,加入预熔精炼渣4~5kg/t钢,杂灰1.5kg/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580NL/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,去除炉渣中气体含量,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1630℃,然后向钢包底部喂入铝线,对钢水进行脱氧,钢水定氧5ppm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20min,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23%,镁处理结束后静搅时间18min;
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;
S6、坯料加热温度1139℃,加热时间按坯料厚度计算为12min/cm,均热时间42min,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1033℃,二开温度795℃,终轧温度771℃;
S8、钢板入水温度755℃,返红温度363℃,冷却辊速0.5m/s,加速度0.005m/s2;
S9、钢板剪切后进行回火处理,回火温度330℃,回火后空冷至室温,钢板表检合格后入库。
实施例2
本实施例提供的一种500MPa级耐候桥梁钢,与实施例1的区别在于,其化学成分及质量百分比如下:C:0.056%,Si:0.39%,Mn:1.67%,P:0.013%,S:0.0009%,Nb:0.044%,V:0.033%,Ti:0.009%,Cr:0.58%,Ni:0.21%,Mo:0.11%,Cu:0.26%,B:0.0002%,Al:0.016%,Mg:0.0014%,N:0.0037%,I≥6.5%,不添加Ca,余量为Fe和不可避免的杂质。
实施例1、实施例2钢板的力学性能测试结果如下表:
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,大大提高了产品的焊接性能,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 (4)
1.一种500MPa级耐候桥梁钢,其特征在于:其化学成分及质量百分比如下:C:0.04%~0.06%,Si:0.20%~0.40%,Mn:1.50%~1.70%,P:0.010%~0.015%,S≤0.0010%,Nb:0.030%~0.050%,V:0.020%~0.040%,Ti:0.006%~0.020%,Cr:0.55%~0.65%,Ni:0.20%~0.30%,Mo:0.08%~0.15%,Cu:0.22%~0.30%,B≤0.0005%,Al:0.015%~0.030%,Mg:0.0008%~0.0015%,N≤0.0050%,I≥6.5%,不添加Ca,余量为Fe和不可避免的杂质;
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、使用自产低硫废钢,镍、铜、钼合金随废钢一起加入转炉,出钢温度1640~1680℃,添加锰铁、硅铁及铝块进行出钢合金化操作,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,去除炉渣中气体含量,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,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20min,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≥15min;
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;
S6、坯料加热温度1130±10℃,加热时间按坯料厚度计算为10~13min/cm,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780~880℃,终轧温度750~850℃;
S8、钢板入水温度740~800℃,返红温度350~550℃,冷却辊速0.30~1.00m/s,加速度0.002~0.013m/s²;
S9、钢板剪切后进行回火处理,回火温度300~800℃,回火后空冷至室温,钢板表检合格后入库。
2.根据权利要求1所述的一种500MPa级耐候桥梁钢,其特征在于:其化学成分及质量百分比如下:C:0.04%~0.06%,Si:0.25%~0.35%,Mn:1.55%~1.65%,P:0.011%~0.015%,S≤0.0010%,Nb:0.035%~0.045%,V:0.025%~0.035%,Ti:0.009%~0.018%,Cr:0.56%~0.63%,Ni:0.22%~0.29%,Mo:0.10%~0.15%,Cu:0.23%~0.28%,B≤0.0005%,Al:0.016%~0.029%,Mg:0.0009%~0.0013%,N≤0.0050%,I≥6.5%,不添加Ca,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500MPa级耐候桥梁钢,其特征在于:其化学成分及质量百分比如下:C:0.042%~0.06%,Si:0.30%~0.40%,Mn:1.60%~1.70%,P:0.011%~0.015%,S≤0.0010%,Nb:0.040%~0.050%,V:0.030%~0.040%,Ti:0.010%~0.020%,Cr:0.60%~0.65%,Ni:0.25%~0.30%,Mo:0.10%~0.15%,Cu:0.23%~0.30%,B≤0.0005%,Al:0.020%~0.030%,Mg:0.0010%~0.0015%,N≤0.0050%,I≥6.5%,不添加Ca,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500MPa级耐候桥梁钢,其特征在于:所述步骤S4中,镁铝线的镁含量为20%~30%。
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