CN115612936A - 一种制钉用低碳钢盘条的制备方法 - Google Patents
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Abstract
本发明公开了一种制钉用低碳钢盘条的制备方法,属于低碳钢盘条制造技术领域。所述的低碳钢盘条的化学成分及重量百分比为:C:0.12~0.18%,Si:0.10~0.25%,Mn:0.30~0.50%,P≤0.035%,S≤0.035%,Ni≤0.20%,Cr≤0.20%,Cu≤0.20%,余量为铁和不可避免的杂质,所述的低碳钢盘条的生产工艺流程包括冶炼和控轧控冷工艺,所述的冶炼的工艺流程为:铁水预处理→转炉→氩站吹氩→方坯连铸,所述控轧控冷的工艺流程为:加热炉加热→高压水除鳞→轧制→缓冷。本发明通过统筹兼顾冶炼过程和轧制过程控轧控冷,实现不通过炉外精炼,只进行控轧控冷实现理想的显微组织形式,满足制钉加工和使用性能要求,降低生产成本。
Description
技术领域
本发明属于低碳钢盘条制造技术领域,具体涉及一种制钉用低碳钢盘条的制备方法。
背景技术
制钉用低碳钢盘条由于特殊的使用和加工过程,要求其具有良好的塑韧性及冷镦性能,低生产成本,且保证产品后期拉拔加工除鳞效果和冷镦不开裂。一般冷镦钢盘条钢质纯净度要求高,采用精炼工艺、铝脱氧,制钉用低碳钢盘条冷镦加工程度不如冷镦钢盘条复杂,若采用冷镦钢盘条成本较高,价格偏高;若使用低成本低碳钢盘条Q235替代,但存在化学成分和力学性能波动大、质量不稳定,影响后续加工和使用。专利201210051884.4介绍《一种低碳冷镦钢热轧盘条表面氧化铁皮的控制方法》该生产方法通过轧制过程温度、冷却速度控制,实现了SWRCH22A盘条机械除鳞效果和降低了用户拉拔过程中断丝率和模具的损耗。然而,关于制钉用低碳钢热轧盘条的相关研究还未见报道。
发明内容
鉴于此,本发明的目的是提供了一种制钉用低碳钢盘条的制备方法。本发明统筹冷镦钢和普通低碳拉丝材特点,制备一种既具备冷镦钢性能、成本相对更低的产品,满足加工和使用要求。
本发明目的是通过以下方式实现:
本发明提供一种制钉用低碳钢盘条的制备方法,所述的低碳钢盘条的化学成分及重量百分比为:C:0.12~0.18%,Si:0.10~0.25%,Mn:0.30~0.50%,P≤0.035%,S≤0.035%,Ni≤0.20%,Cr≤0.20%,Cu≤0.20%,余量为铁和不可避免的杂质;所述的低碳钢盘条的生产工艺流程包括冶炼和控轧控冷工艺。
基于上述技术方案,进一步地,所述的冶炼的工艺流程为:铁水预处理→转炉→氩站吹氩→方坯连铸。
基于上述技术方案,进一步地,铁水预处理前铁水成分控制:P≤0.130%,S≤0.035%,铁水温度≥1270℃。
基于上述技术方案,进一步地,转炉出钢后氩站吹氩工序:软吹氩时间≥5min,终点氧≤1200ppm。
基于上述技术方案,进一步地,连铸工序:开浇炉次过热度≤45℃,连浇炉次过热度≤35℃;拉速2.0-2.6m/min,二冷水比水量1.1~1.4,全程采用保护浇注。
基于上述技术方案,进一步地,所述控轧控冷的工艺流程为:加热炉加热→高压水除鳞→轧制→缓冷。
基于上述技术方案,进一步地,加热炉加热制度:预热段温度950±50℃,加热段温度1130±50℃,均热段温度1150±50℃;在炉时间:2.5-4.5h。
基于上述技术方案,进一步地,高压水除磷水压力要求≥14MPa;除鳞后,钢坯表面不得有可视残留氧化铁皮。
基于上述技术方案,进一步地,轧制温度控制:1架入口1010±30℃,精轧入口900±30℃,吐丝920±30℃。
基于上述技术方案,进一步地,风冷辊道缓冷过程中头部速度0.25-0.35m/s,辊道增速2-5%。统筹风机、风门和佳灵统筹和保温罩使用,缓慢冷却,保证线圈在风冷辊道上冷却速度为1.1-1.5℃/s。
本发明提供上述制备方法制得制钉用低碳钢盘条。
本发明相对于现有技术具有的有益效果如下:
1.本发明通过成分设计创新与工艺创新,保证一定的强度同时具有冷镦性能要求,通过统筹兼顾冶炼过程和轧制过程控轧控冷,不经过炉外精炼,通过合理控轧控冷工艺实现理想的显微组织形式,保证盘条在一定屈强比范围,满足制钉加工和使用性能要求,生产成本降低约50元/t。
2.本发明制钉用低碳钢盘条的新工艺的研究为其他钢种生产及工艺改进奠定技术基础。
附图说明
为了更清楚地说明本发明实施例,下面将对实施例涉及的附图进行简单地介绍。
图1为实施例1中盘条金相组织图。
图2为实施例1中铸坯低倍组织。
图3为实施例1中盘条表面质量。
具体实施方式
下面结合实施例对本发明进行详细的说明,但本发明的实施方式不限于此,显而易见地,下面描述中的实施例仅是本发明的部分实施例,对于本领域技术人员来讲,在不付出创造性劳动性的前提下,获得其他的类似的实施例均落入本发明的保护范围。
实施例1-5
本实施例公开一种制钉用低碳钢盘条的制备方法,低碳钢盘条的化学成分及重量百分比如表1所示,该制钉用低碳钢盘条的生产工艺流程包括冶炼和控轧控冷工艺:
1.冶炼
冶炼工艺具体为:铁水预处理→转炉→氩站吹氩→方坯连铸。
1.1铁水预处理:铁水成分及铁水温度具体数据见表2,预处理过程为:加入石灰粉2.0-2.15kg/t,镁粉0.64-0.74kg/t,出站温度1300℃,出站S含量0.007-0.020%。
1.2转炉及氩站吹氩工序:软吹氩时间以及终点氧的具体数据见表2。
1.3连铸工序:开浇炉次过热度≤45℃,连浇炉次过热度≤35℃。拉速2.0-2.6m/min,二冷水比水量1.1~1.4,全程采用保护浇注,具体参数参见表3;
2.控轧控冷
控轧控冷工艺具体为:加热→高压水除鳞→轧制→缓冷→精整→头部标识→质检→打包(包装)→入库。
2.1加热炉加热制度:
预热段温度、加热段温度、均热段温度和在炉时间具体参数参见表4;
2.2高压水除磷水压力要求参见表4,除鳞后,钢坯表面不得有可视残留氧化铁皮。
2.3轧制温度控制:
1架入口温度、精轧入口温度和吐丝温度的具体数值参见表4;
2.4线材冷却:统筹保证线圈在辊道上冷却速度为1.1~1.5℃/s。
2.4.1风机冷却工艺控制:
风机、风门和佳灵统筹开启设置具体见表5。
2.4.2风冷辊道参数设定:
头部辊道速度以及辊道增速的数据见表6;
2.4.3保温罩设定:
16个保温罩需统筹开启设置情况见表7。
2.4.4保温通道设定:
保温通道内保证缓慢冷却。
表1.低碳钢盘条的规格、组分及重量百分比
表2.铁水条件及转炉控制条件
表3.精炼和连铸控制条件
表4.轧制温度控制参数
表5.风机控制条件
表6.辊道速度控制条件
实例 | 头部辊道/m/s | 辊道增速/% |
实施例1 | 0.27 | 2.3 |
实施例2 | 0.27 | 2.3 |
实施例3 | 0.28 | 2.3 |
实施例4 | 0.28 | 2.3 |
实施例5 | 0.28 | 2.3 |
表7.保温罩条件设置
表8.低碳钢盘条的显微组织及物理性能
由表8可知,实施例1-5制备的低碳钢盘条的显微组织形式为铁素体+珠光体,抗拉强度不大于500MPa,屈强比<0.7,断后伸长率不小于25%;弯曲试验(冷弯试验180°,弯心直径为0.5倍试样直径)无裂纹,1/3冷顶锻试验无裂纹;低倍组织缺陷级别均在1.0级别以下,盘条表面质量满足标准要求,保证了盘条加工和使用性能。
最后应说明的是:以上各实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述各实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分或者全部技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。
Claims (10)
1.一种制钉用低碳钢盘条的制备方法,其特征在于,所述的低碳钢盘条的化学成分及重量百分比为:C:0.12~0.18%,Si:0.10~0.25%,Mn:0.30~0.50%,P≤0.035%,S≤0.035%,Ni≤0.20%,Cr≤0.20%,Cu≤0.20%,余量为铁和不可避免的杂质;所述的低碳钢盘条的生产工艺流程包括冶炼和控轧控冷工艺;
所述的冶炼的工艺流程为:铁水预处理→转炉→氩站吹氩→方坯连铸;
所述控轧控冷的工艺流程为:加热炉加热→高压水除鳞→轧制→缓冷。
2.根据权利要求1所述的制备方法,其特征在于,铁水预处理前铁水成分控制:P≤0.130%,S≤0.035%,铁水温度≥1270℃。
3.根据权利要求1所述的制备方法,其特征在于,氩站吹氩工序:软吹氩时间≥5min,终点氧≤1200ppm。
4.根据权利要求1所述的制备方法,其特征在于,连铸工序:开浇炉次过热度≤45℃,连浇炉次过热度≤35℃;拉速2.0-2.6m/min,二冷水比水量1.1~1.4,全程采用保护浇注。
5.根据权利要求1所述的制备方法,其特征在于,加热炉加热制度:预热段温度950±50℃,加热段温度1130±50℃,均热段温度1150±50℃;在炉时间:2.5-4.5h。
6.根据权利要求1所述的制备方法,其特征在于,高压水除磷水压力要求≥14MPa。
7.根据权利要求1所述的制备方法,其特征在于,轧制温度控制:1架入口1010±30℃,精轧入口900±30℃,吐丝920±30℃。
8.根据权利要求1所述的制备方法,其特征在于,缓冷保证线圈在辊道上冷却速度为1.1-1.5℃/s。
9.根据权利要求1所述的制备方法,其特征在于,缓冷包括风冷运输线缓冷和保温通道缓冷。
10.权利要求1-9任一项所述的制备方法制得的制钉用低碳钢盘条。
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