CN113234999A - 一种高效焊接桥梁钢及其制造方法 - Google Patents
一种高效焊接桥梁钢及其制造方法 Download PDFInfo
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Abstract
本发明公开了一种高效焊接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:0.05%~0.08%,Si:0.10%~0.30%,Mn:1.10%~1.50%,P≤0.015%,S≤0.0050%,Nb:0.020%~0.040%,V:0.010%~0.040%,Ti:0.006%~0.020%,Cr≤0.05%,Ni:0.10%~0.30%,Mo≤0.05%,Cu≤0.05%,B≤0.0005%,Al:0.025%~0.050%,Mg:0.0010%~0.0030%,N≤0.0050%,不添加Ca,余量为Fe和杂质。通过冶金技术生成以氧化镁、硫化镁及镁铝尖晶石为形核的细小弥散夹杂物,采用TMCP轧制工艺及正火处理,得到以镁质点为形核条件的铁素体及少量珠光体组织,从而提升桥梁钢的焊接性能。
Description
技术领域
本发明涉及钢铁生产技术领域,特别是涉及一种高效焊接桥梁钢及其制造方法。
背景技术
随着我国经济发展,国家基础设施建设越来越完善,大型桥梁建设也达到了世界最高水平,桥梁用钢材质量要求越来越高。桥梁在建设过程中,钢材间需要进行焊接处理,焊接区域的质量对整体桥梁质量有至关重要的影响,提高桥梁用钢焊接性对促进行业发展意义重大。
在产品应用过程中发现,对焊接影响较大的因素来源于钢水的纯净度及钢板的组织晶粒度。较大的夹杂物在焊接过程中成为杂质的质点形成大型夹杂物,导致焊接区域探伤不合格,钢板铁素体晶粒大在焊接过程中会造成晶粒的进一步长大,导致焊接及焊接区域强度弱化,影响产品的力学性能。
发明内容
本发明针对上述技术问题,克服现有技术的缺点,提供一种高效焊接桥梁钢,其化学成分及质量百分比如下:C:0.05%~0.08%,Si:0.10%~0.30%,Mn:1.10%~1.50%,P≤0.015%,S≤0.0050%,Nb:0.020%~0.040%,V:0.010%~0.040%,Ti:0.006%~0.020%,Cr≤0.05%,Ni:0.10%~0.30%,Mo≤0.05%,Cu≤0.05%,B≤0.0005%,Al:0.025%~0.050%,Mg:0.0010%~0.0030%,N≤0.0050%,不添加Ca,余量为Fe和杂质。
技术效果:本发明采用低碳高锰设计,同时添加铌、钒、钛合金,有效细化组织晶粒度,利于铁素体相的生成,提高产品的强度与韧性,有效改善产品的焊接性能。
本发明进一步限定的技术方案是:
前所述的一种高效焊接桥梁钢,其化学成分及质量百分比如下:C:0.05%~0.07%,Si:0.10%~0.20%,Mn:1.10%~1.30%,P≤0.014%,S≤0.0030%,Nb:0.020%~0.030%,V:0.010%~0.030%,Ti:0.006%~0.020%,Cr≤0.05%,Ni:0.10%~0.20%,Mo≤0.05%,Cu≤0.05%,B≤0.0005%,Al:0.025%~0.035%,Mg:0.0010%~0.0020%,N≤0.0050%,不添加Ca,余量为Fe和杂质。
前所述的一种高效焊接桥梁钢,其化学成分及质量百分比如下:C:0.055%~0.075%,Si:0.15%~0.25%,Mn:1.20%~1.40%,P≤0.013%,S≤0.0030%,Nb:0.025%~0.035%,V:0.020%~0.030%,Ti:0.008%~0.018%,Cr≤0.03%,Ni:0.15%~0.25%,Mo≤0.05%,Cu≤0.05%,B≤0.0005%,Al:0.030%~0.050%,Mg:0.0015%~0.0025%,N≤0.0050%,不添加Ca,余量为Fe和杂质。
前所述的一种高效焊接桥梁钢,其化学成分及质量百分比如下:C:0.06%~0.08%,Si:0.20%~0.30%,Mn:1.30%~1.50%,P≤0.012%,S≤0.0020%,Nb:0.030%~0.040%,V:0.030%~0.040%,Ti:0.012%~0.020%,Cr≤0.05%,Ni:0.20%~0.30%,Mo≤0.05%,Cu≤0.05%,B≤0.0005%,Al:0.030%~0.050%,Mg:0.0015%~0.0030%,N≤0.0050%,不添加Ca,余量为Fe和杂质。
本发明的另一目的在于提供一种高效焊接桥梁钢的制造方法,包括以下步骤:
S1、采用转炉或电炉进行钢水冶炼,出钢采用全脱氧,炉后铝含量0.020%~0.050%;
S2、采用LF进行脱硫造渣,依据成分设计进行合金化,不进行镁合金处理;
S3、采用RH或VD进行真空处理,真空处理结束后喂入镁铝线,镁含量0.0020%~0.0040%,镁处理结束后静搅15min;
S4、连铸采用透气水口,保证浇铸顺利,过热度满足15~35℃,采用电磁搅拌及动态轻压下工艺;
S5、坯料表检合格后在步进式加热炉加热,奥氏体化温度设定为1120±10℃,加热时间按坯料厚度以8~11min/cm计算,均热时间≥30min;
S6、采用单机架可逆轧机进行轧制,二开温度800~980℃,终轧温度760~900℃,入水温度750~850℃,返红温度600~700℃,钢板冷却后剪切探伤;
S7、钢板进行正火处理,正火温度900~950℃,保温时间20~30min,正火后空冷至常温;
S8、钢板性能检测、表检、标识后进行发货处理。
前所述的一种高效焊接桥梁钢的制造方法,钢板组织为铁素体和少量珠光体组织。
前所述的一种高效焊接桥梁钢的制造方法,包括以下步骤:
S1、采用转炉或电炉进行钢水冶炼,出钢采用全脱氧,炉后铝含量0.033%~0.041%;
S2、采用LF进行脱硫造渣,依据成分设计进行合金化,不进行镁合金处理;
S3、采用RH或VD进行真空处理,真空处理结束后喂入镁铝线,镁含量0.0025%~0.0033%,镁处理结束后静搅15min;
S4、连铸采用透气水口,保证浇铸顺利,过热度满足15~26℃,采用电磁搅拌及动态轻压下工艺;
S5、坯料表检合格后在步进式加热炉加热,奥氏体化温度设定为1120±10℃,加热时间按坯料厚度以8~11min/cm计算,均热时间≥30min;
S6、采用单机架可逆轧机进行轧制,二开温度845~900℃,终轧温度816~868℃,入水温度798~826℃,返红温度636~682℃,钢板冷却后剪切探伤;
S7、钢板进行正火处理,正火温度920~947℃,保温时间20~30min,正火后空冷至常温;
S8、钢板性能检测、表检、标识后进行发货处理。
本发明的有益效果是:
(1)本发明通过对镁、铝、钙等活泼元素的成份设定,有效发挥了镁元素对夹杂物的改质作用,生成了以氧化镁、硫化镁及镁铝尖晶石为形核的细小固态夹杂物,细小的夹杂物成为了奥体化形核质点,焊接热熔后细小的质点阻止了晶粒的长大,避免了因焊接造成的强度损耗;
(2)本发明采用低温奥氏体化技术,有效降低了原始晶粒度尺寸,轧制后钢板晶粒均匀细小,大幅度提高了产品的强度与韧性;
(3)本发明采用轧制冷却工艺,充分发挥了组织相变能量,通过轧后快冷,促进了大量贝氏体的生成,消除了钢板心部带状的不利影响,对钢板焊接有积极的作用;
(4)本发明采用正火工艺,消除了钢板的内应力,改善组织均匀性,保证了焊接后内应力的稳定,焊接后钢板强度均匀,有效提升了产品性能。
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高效焊接桥梁钢,其化学成分及质量百分比如下:C:0.06%,Si:0.130%,Mn:1.15%,P:0.011%,S:0.0020%,Nb:0.026%,V:0.016%,Ti:0.017%,Cr:0.02%,Ni:0.19%,Mo:0.01%,Cu:0.03%,B:0.0002%,Al:0.029%,Mg:0.0023%,N:0.00350%,不添加Ca,余量为Fe和杂质。
其制造方法包括以下步骤:
S1、采用转炉或电炉进行钢水冶炼,出钢采用全脱氧,炉后铝含量0.041%;
S2、采用LF进行脱硫造渣,依据成分设计进行合金化,不进行镁合金处理;
S3、采用RH或VD进行真空处理,真空处理结束后喂入镁铝线,镁含量0.0033%,镁处理结束后静搅15min;
S4、连铸采用透气水口,保证浇铸顺利,过热度满足26℃,采用电磁搅拌及动态轻压下工艺;
S5、坯料表检合格后在步进式加热炉加热,奥氏体化温度设定为1129℃,加热时间按坯料厚度以10min/cm计算,均热时间36min;
S6、采用单机架可逆轧机进行轧制,二开温度900℃,终轧温度868℃,入水温度826℃,返红温度636℃,钢板冷却后剪切探伤;
S7、钢板进行正火处理,正火温度920℃,保温时间23min,正火后空冷至常温;
S8、钢板性能检测、表检、标识后进行发货处理。
实施例2
本实施例提供的一种高效焊接桥梁钢,与实施例1的区别在于,其化学成分及质量百分比如下:C:0.068%,Si:0.23%,Mn:1.35%,P:0.011%,S:0.00150%,Nb:0.033%,V:0.026%,Ti:0.016%,Cr:0.02%,Ni:0.22%,Mo:0.03%,Cu:0.02%,B:0.0001%,Al:0.041%,Mg:0.0021%,N:0.0043%,不添加Ca,余量为Fe和杂质。
实施例3
本实施例提供的一种高效焊接桥梁钢,与实施例1的区别在于,其化学成分及质量百分比如下:C:0.073%,Si:0.23%,Mn:1.44%,P:0.010%,S:0.0010%,Nb:0.036%,V:0.033%,Ti:0.016%,Cr:0.02%,Ni:0.27%,Mo:0.02%,Cu:0.02%,B:0.0001%,Al:0.039%,Mg:0.0013%,N:0.0029%,不添加Ca,余量为Fe和杂质。
依据GB T 714-2008桥梁用结构钢标准要求对材质进行理化检测,实施例1、实施例2、实施例3钢板力学性能测试结果如下表:
本发明以产品设计为基础,通过镁冶金技术实现纯净钢冶炼,并获得以氧化镁、硫化镁及镁铝尖晶石为形核的细小弥散夹杂物,这种细小的夹杂物在钢中起到了奥氏体形核质点,细化了原始奥氏体晶界,配合轧制工艺得到组织均匀细小的组织形态,如图1,解决了焊接过程中因高温造成焊区及热影响区软化的问题,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 (7)
1.一种高效焊接桥梁钢,其特征在于:其化学成分及质量百分比如下:C:0.05%~0.08%,Si:0.10%~0.30%,Mn:1.10%~1.50%,P≤0.015%,S≤0.0050%,Nb:0.020%~0.040%,V:0.010%~0.040%,Ti:0.006%~0.020%,Cr≤0.05%,Ni:0.10%~0.30%,Mo≤0.05%,Cu≤0.05%,B≤0.0005%,Al:0.025%~0.050%,Mg:0.0010%~0.0030%,N≤0.0050%,不添加Ca,余量为Fe和杂质。
2.根据权利要求1所述的一种高效焊接桥梁钢,其特征在于:其化学成分及质量百分比如下:C:0.05%~0.07%,Si:0.10%~0.20%,Mn:1.10%~1.30%,P≤0.014%,S≤0.0030%,Nb:0.020%~0.030%,V:0.010%~0.030%,Ti:0.006%~0.020%,Cr≤0.05%,Ni:0.10%~0.20%,Mo≤0.05%,Cu≤0.05%,B≤0.0005%,Al:0.025%~0.035%,Mg:0.0010%~0.0020%,N≤0.0050%,不添加Ca,余量为Fe和杂质。
3.根据权利要求1所述的一种高效焊接桥梁钢,其特征在于:其化学成分及质量百分比如下:C:0.055%~0.075%,Si:0.15%~0.25%,Mn:1.20%~1.40%,P≤0.013%,S≤0.0030%,Nb:0.025%~0.035%,V:0.020%~0.030%,Ti:0.008%~0.018%,Cr≤0.03%,Ni:0.15%~0.25%,Mo≤0.05%,Cu≤0.05%,B≤0.0005%,Al:0.030%~0.050%,Mg:0.0015%~0.0025%,N≤0.0050%,不添加Ca,余量为Fe和杂质。
4.根据权利要求1所述的一种高效焊接桥梁钢,其特征在于:其化学成分及质量百分比如下:C:0.06%~0.08%,Si:0.20%~0.30%,Mn:1.30%~1.50%,P≤0.012%,S≤0.0020%,Nb:0.030%~0.040%,V:0.030%~0.040%,Ti:0.012%~0.020%,Cr≤0.05%,Ni:0.20%~0.30%,Mo≤0.05%,Cu≤0.05%,B≤0.0005%,Al:0.030%~0.050%,Mg:0.0015%~0.0030%,N≤0.0050%,不添加Ca,余量为Fe和杂质。
5.一种高效焊接桥梁钢的制造方法,其特征在于:应用于权利要求1-4任意一项,包括以下步骤:
S1、采用转炉或电炉进行钢水冶炼,出钢采用全脱氧,炉后铝含量0.020%~0.050%;
S2、采用LF进行脱硫造渣,依据成分设计进行合金化,不进行镁合金处理;
S3、采用RH或VD进行真空处理,真空处理结束后喂入镁铝线,镁含量0.0020%~0.0040%,镁处理结束后静搅15min;
S4、连铸采用透气水口,保证浇铸顺利,过热度满足15~35℃,采用电磁搅拌及动态轻压下工艺;
S5、坯料表检合格后在步进式加热炉加热,奥氏体化温度设定为1120±10℃,加热时间按坯料厚度以8~11min/cm计算,均热时间≥30min;
S6、采用单机架可逆轧机进行轧制,二开温度800~980℃,终轧温度760~900℃,入水温度750~850℃,返红温度600~700℃,钢板冷却后剪切探伤;
S7、钢板进行正火处理,正火温度900~950℃,保温时间20~30min,正火后空冷至常温;
S8、钢板性能检测、表检、标识后进行发货处理。
6.根据权利要求5所述的一种高效焊接桥梁钢的制造方法,其特征在于:钢板组织为铁素体和少量珠光体组织。
7.根据权利要求5所述的一种高效焊接桥梁钢的制造方法,其特征在于:包括以下步骤:
S1、采用转炉或电炉进行钢水冶炼,出钢采用全脱氧,炉后铝含量0.033%~0.041%;
S2、采用LF进行脱硫造渣,依据成分设计进行合金化,不进行镁合金处理;
S3、采用RH或VD进行真空处理,真空处理结束后喂入镁铝线,镁含量0.0025%~0.0033%,镁处理结束后静搅15min;
S4、连铸采用透气水口,保证浇铸顺利,过热度满足15~26℃,采用电磁搅拌及动态轻压下工艺;
S5、坯料表检合格后在步进式加热炉加热,奥氏体化温度设定为1120±10℃,加热时间按坯料厚度以8~11min/cm计算,均热时间≥30min;
S6、采用单机架可逆轧机进行轧制,二开温度845~900℃,终轧温度816~868℃,入水温度798~826℃,返红温度636~682℃,钢板冷却后剪切探伤;
S7、钢板进行正火处理,正火温度920~947℃,保温时间20~30min,正火后空冷至常温;
S8、钢板性能检测、表检、标识后进行发货处理。
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CN114411044A (zh) * | 2022-01-19 | 2022-04-29 | 南京钢铁股份有限公司 | 一种具有低焊接裂纹敏感性压力容器用钢制造方法 |
CN114525453A (zh) * | 2022-02-16 | 2022-05-24 | 南京钢铁股份有限公司 | 一种薄规格桥梁用钢及其生产方法 |
WO2023155372A1 (zh) * | 2022-02-16 | 2023-08-24 | 南京钢铁股份有限公司 | 一种薄规格桥梁用钢及其生产方法 |
CN116949358A (zh) * | 2023-07-17 | 2023-10-27 | 南京钢铁股份有限公司 | 一种高性能建筑用钢及其制造方法 |
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