CN116083808A - 一种≤q345级市场流通板用钢及其生产方法 - Google Patents

一种≤q345级市场流通板用钢及其生产方法 Download PDF

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CN116083808A
CN116083808A CN202310109989.9A CN202310109989A CN116083808A CN 116083808 A CN116083808 A CN 116083808A CN 202310109989 A CN202310109989 A CN 202310109989A CN 116083808 A CN116083808 A CN 116083808A
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翟冬雨
高飞
邹青
陈璐
陈从俊
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Nanjing Iron and Steel Co Ltd
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Abstract

本发明公开了一种≤Q345级市场流通板用钢及其生产方法,涉及钢铁生产技术领域,其化学成分及质量百分比如下:C:0.17%~0.20%,Si:0.10%~0.30%,Mn:0.70%~1.10%,P:0.030%,S:0.020%,Nb≤0.060%,Ti≤0.020%,余量为Fe和不可避免的杂质。根据生产实际情况,降低了铌、钛等贵重元素使用,采用合金替代,并通过冶炼和轧制工艺优化,在保证低合金高强度结构钢良好的力学性能的同时,降低市场流通板的生产成本;同时也去除了铝的使用量,采用了成本更为低廉的碳化硅进行脱氧,有效降低了冶炼成本。

Description

一种≤Q345级市场流通板用钢及其生产方法
技术领域
本发明涉及钢铁生产技术领域,特别是涉及一种≤Q345级市场流通板用钢及其生产方法。
背景技术
随着钢铁行业形势、市场环境的变化,高质量低成本生产要求深入人心。以节能、降耗、减排为特征的绿色生产模式,对降本增效的利好是长期的。目前,不大于Q355级别市场需求量较大,是商家的必争之地,也是价格战最严重的品种。因此,为了适应市场的变化,促使钢厂不断创新工艺技术,降低品种成本。
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≤Q345级市场流通板用钢,其化学成分及质量百分比如下:C:0.17%~0.20%,Si:0.10%~0.30%,Mn:0.70%~1.10%,P:0.030%,S:0.020%,Nb≤0.060%,Ti≤0.020%,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≤Q345级市场流通板用钢,其化学成分及质量百分比如下:C:0.17%~0.19%,Si:0.10%~0.20%,Mn:0.80%~1.10%,P:0.030%,S:0.020%,Nb≤0.060%,Ti≤0.020%,余量为Fe和不可避免的杂质。
前所述的一种≤Q345级市场流通板用钢,其化学成分及质量百分比如下:C:0.18%~0.20%,Si:0.20%~0.30%,Mn:0.70%~0.90%,P:0.030%,S:0.020%,Nb≤0.060%,Ti≤0.020%,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≤Q345级市场流通板用钢生产方法,包括:
S1、采用鱼雷罐进行铁水运输,运输过程中加入活性石灰600~1000kg,达到脱硫、保温的目的;铁水出铁后导入铁水罐中进行运输,铁水罐最大容量300吨,加入活性石灰800~1000kg进行脱硫;
S2、铁水到达炼钢厂后进行倒罐、扒渣操作,铁水温度1200~1350度;
S3、铁水入转炉/电炉,同时加入一定比例的废钢进行冶炼,冶炼终点温度1620~1700℃,终点C:0.050%~0.15%,终点P≤0.030%,进行出钢作业,出钢过程中加入50~100kg碳化硅进行脱氧;
S4、LF炉进行测温、取样后,采用碳化硅脱氧,脱氧8~10min,达到白渣要求进行合金化;
S5、合金化后钢水吊运至连铸进行浇铸,过热度15~35度,浇铸速度0.6~1.3m/min;
S6、坯料表检合格送至加热炉,奥氏体化温度1150~1250℃,采用常规轧制,终轧温度700~900℃,返红温度500~700℃;
S7、钢板剪切、标识、表检合格后入库发货。
前所述的一种≤Q345级市场流通板用钢生产方法,钢板以铁素体珠光体为主,同时含有少量贝氏体的混合组织。
本发明的有益效果是:根据生产实际情况,降低了铌、钛等贵重元素使用,采用合金替代,并通过冶炼和轧制工艺优化,在保证低合金高强度结构钢良好的力学性能的同时,降低市场流通板的生产成本;同时也去除了铝的使用量,采用了成本更为低廉的碳化硅进行脱氧,有效降低了冶炼成本,提高了企业的市场竞争力。
附图说明
图1为实施例1产品厚度方向金相组织图。
实施方式
实施例
本实施例提供的一种≤Q345级市场流通板用钢,其化学成分及质量百分比如下:C:0.18%,Si:0.16%,Mn:0.97%,P:0.013%,S:0.006%,Nb:0.003%,Ti:0.001%,余量为Fe和不可避免的杂质。
生产方法包括:
S1、采用鱼雷罐进行铁水运输,运输过程中加入活性石灰900kg,达到脱硫、保温的目的;铁水出铁后导入铁水罐中进行运输,铁水罐最大容量300吨,加入活性石灰850kg进行脱硫;
S2、铁水到达炼钢厂后进行倒罐、扒渣操作,铁水温度1315度;
S3、铁水入转炉/电炉,同时加入一定比例的废钢进行冶炼,冶炼终点温度1689℃,终点C:0.09%,终点P:0.009%,进行出钢作业,出钢过程中加入60kg碳化硅进行脱氧;
S4、LF炉进行测温、取样后,采用碳化硅脱氧,脱氧10min,达到白渣要求进行合金化;
S5、合金化后钢水吊运至连铸进行浇铸,过热度26度,浇铸速度0.9m/min;
S6、坯料表检合格送至加热炉,奥氏体化温度1230℃,采用常规轧制,终轧温度870℃,返红温度560℃;
S7、钢板剪切、标识、表检合格后入库发货。
实施例
本实施例提供的一种≤Q345级市场流通板用钢,其化学成分及质量百分比如下:C:0.19%,Si:0.27%,Mn:0.79%,P:0.021%,S:0.010%,Nb:0.002%,Ti:0.003%,余量为Fe和不可避免的杂质。
生产方法包括:
S1、采用鱼雷罐进行铁水运输,运输过程中加入活性石灰700kg,达到脱硫、保温的目的;铁水出铁后导入铁水罐中进行运输,铁水罐最大容量300吨,加入活性石灰800kg进行脱硫;
S2、铁水到达炼钢厂后进行倒罐、扒渣操作,铁水温度1270度;
S3、铁水入转炉/电炉,同时加入一定比例的废钢进行冶炼,冶炼终点温度1650℃,终点C:0.13%,终点P:0.016%,进行出钢作业,出钢过程中加入90kg碳化硅进行脱氧;
S4、LF炉进行测温、取样后,采用碳化硅脱氧,脱氧8min,达到白渣要求进行合金化;
S5、合金化后钢水吊运至连铸进行浇铸,过热度19度,浇铸速度1.1m/min;
S6、坯料表检合格送至加热炉,奥氏体化温度1140℃,采用常规轧制,终轧温度750℃,返红温度620℃;
S7、钢板剪切、标识、表检合格后入库发货。
将实施例1、实施例2获得的产品进行力学性能测试,结果如下表:
采用去除铌、钛、铝的设计思路,采用了碳化硅的脱氧方式,采用了常规轧制技术及冷却手段,获得了以铁素体珠光体同时含有少量贝氏体的混合组织,满足了产品的强韧性要求,有效降低了生产制造成本,提高了市场竞争力。
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≤Q345级市场流通板用钢,其特征在于:其化学成分及质量百分比如下:C:0.17%~0.20%,Si:0.10%~0.30%,Mn:0.70%~1.10%,P:0.030%,S:0.020%,Nb≤0.060%,Ti≤0.020%,余量为Fe和不可避免的杂质。
2.根据权利要求1所述的一种≤Q345级市场流通板用钢,其特征在于:其化学成分及质量百分比如下:C:0.17%~0.19%,Si:0.10%~0.20%,Mn:0.80%~1.10%,P:0.030%,S:0.020%,Nb≤0.060%,Ti≤0.020%,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≤Q345级市场流通板用钢,其特征在于:其化学成分及质量百分比如下:C:0.18%~0.20%,Si:0.20%~0.30%,Mn:0.70%~0.90%,P:0.030%,S:0.020%,Nb≤0.060%,Ti≤0.020%,余量为Fe和不可避免的杂质。
4.一种≤Q345级市场流通板用钢生产方法,其特征在于:包括:
S1、采用鱼雷罐进行铁水运输,运输过程中加入活性石灰600~1000kg,达到脱硫、保温的目的;铁水出铁后导入铁水罐中进行运输,铁水罐最大容量300吨,加入活性石灰800~1000kg进行脱硫;
S2、铁水到达炼钢厂后进行倒罐、扒渣操作,铁水温度1200~1350度;
S3、铁水入转炉/电炉,同时加入一定比例的废钢进行冶炼,冶炼终点温度1620~1700℃,终点C:0.050%~0.15%,终点P≤0.030%,进行出钢作业,出钢过程中加入50~100kg碳化硅进行脱氧;
S4、LF炉进行测温、取样后,采用碳化硅脱氧,脱氧8~10min,达到白渣要求进行合金化;
S5、合金化后钢水吊运至连铸进行浇铸,过热度15~35度,浇铸速度0.6~1.3m/min;
S6、坯料表检合格送至加热炉,奥氏体化温度1150~1250℃,采用常规轧制,终轧温度700~900℃,返红温度500~700℃;
S7、钢板剪切、标识、表检合格后入库发货。
5.根据权利要求1所述的一种≤Q345级市场流通板用钢及其生产方法,其特征在于:钢板以铁素体珠光体为主,同时含有少量贝氏体的混合组织。
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Citations (9)

* Cited by examiner, † Cited by third party
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