CN114635093A - 一种家电用冷轧低碳钢的制造方法 - Google Patents
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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Abstract
本发明公开了一种家电用冷轧低碳钢的制造方法,其生产工艺包括,转炉冶炼、连铸、热轧、酸洗、冷轧、连续退火和平整工序;所述热轧工序中,铸坯加热温度1210~1260℃,热轧加热温度1190~1220℃,均热温度1200~1220℃,在炉时间180~240min,均热时间30~60min,终轧温度860~910℃,卷取温度630~670℃。本发明的目的是提供一种家电用冷轧低碳钢的制造方法,通过成分、热轧、连退工艺及先进生产工艺,达到家电用钢低成本和良好的综合性能,满足家电与钢制家具领域的同时,提升钢厂盈利能力。
Description
技术领域
本发明涉及家电与钢制家具领域,尤其涉及一种家电用冷轧低碳钢的制造方法。
背景技术
冷轧低碳钢因其强度低、硬度低而软,塑性、韧性、焊接性较好。因此其冷成形性良好,可采用卷边、折弯、冲压等方法进行冷成形,被广泛用于制作各种建筑构件、容器、箱体、炉体、农机具、汽车驾驶室等产品。冷轧低碳钢钢板可以采用连续退火和罩式退火两种方式进行生产。采用连续退火方式生产的冷轧低碳钢板晶粒细小,间隙原子含量较高,具有较高的强度与硬度。罩式退火方式生产的冷轧低碳钢,铁素体晶粒粗大,碳、氮等间隙原子以碳化物和氮化物的形态析出,产品强度硬度较低。由于罩式退火方式生产的冷轧低碳钢板钢质较软,要想应用在家电与钢制家具领域,需要在低碳钢中添加Ti或Nb等昂贵的合金元素。因此,利用连续退火生产方式,在不添加任何昂贵的合金元素前提下,通过化学成分、热轧工艺、连退工艺设计,生产出满足家电与钢制家具领域使用的冷轧低碳钢。
目前市场上多数冷轧低碳钢产品,采用传统的罩式退火生产。为了提高产品强度,需要添加Nb、Ti等合金元素,合金成本较高,有的要求控制杂质S元素。不仅不利于排产组产,而且还会增加炼钢成本。在激烈的市场竞争环境下,降低钢厂生产成本,节能降耗,获得产品最终价格优势,跑赢市场。因此利用先进的连续退火方式,开发出低成本、高强度、适用于家电与钢制家具行业的冷轧低碳钢显的尤为重要。
公开号为CN101736193A的专利申请提出了一种低碳钢板及其制备方法,其发明人在实践中发现调整低碳钢板的化学成分组成,在低碳钢中添加微量的钛,同时选择罩式退火,加热保温9~10个小时。添加钛合金、保温9~10小时,拖慢生产节奏效率,提高了生产成本。
公开号为CN109332616A的专利申请提出了一种冷轧低碳钢板及其短流程制造方法,该方法采用传统罩式退火工艺,拖慢生产节奏。
公开号为CN104404367A的专利申请提出了一种高强度高塑性冷轧低碳钢及其制备方法,其发明人在成分设计上添加0~0.05%的Nb元素,将冷轧板加热至910±10℃,然后水冷至220±10℃,再淬火至400±10℃,得到屈服强度740MPa,抗拉强度1010MPa,组织为铁素体、板条马氏体及残余奥氏体的Q-P钢。该专利下得到的冷轧低碳钢产品性能高,无法满足家电与钢制家具领域使用,专利发明人为了获得高强度,在成分设计上添加昂贵的Nb元素,通过复杂的退火工艺,得到高强度高塑性产品的同时,增大能耗,增加生产成本。
上述专利所涉及冷轧低碳钢板的制备方法都采用了较为复杂的生产工艺流程,添加了昂贵的Ti、Nb合金元素,制作出的冷轧低碳钢产品性能不能完全满足家电与钢制家具领域。
发明内容
为了解决上述技术问题,本发明的目的是提供一种家电用冷轧低碳钢的制造方法,通过成分、热轧、连退工艺及先进生产工艺,达到家电用钢低成本和良好的综合性能,满足家电与钢制家具领域的同时,提升钢厂盈利能力。
为解决上述技术问题,本发明采用如下技术方案:
本发明一种家电用冷轧低碳钢的制造方法,所述家电用冷轧低碳钢的化学成分重量百分比为:C:0.01~0.08%,Si:0.020~0.040%,Mn:0.20~0.40%,P:≤0.020%,S:≤0.015%,N:≤50ppm,其余为Fe和不可避免的杂质;
其生产工艺包括,转炉冶炼、连铸、热轧、酸洗、冷轧、连续退火和平整工序;所述热轧工序中,铸坯加热温度1210~1260℃,热轧加热温度1190~1220℃,均热温度1200~1220℃,在炉时间180~240min,均热时间30~60min,终轧温度860~910℃,卷取温度630~670℃。
进一步的,所述冷轧工序中,冷轧压下率为62%以上。
进一步的,所述连续退火的工序中,退火温度为740~790℃,过时效1温度350~400℃,过时效2温度300~375℃,终冷温度≤150℃。
进一步的,所述平整工序中,平整机延伸率为0.7~1.2%。
进一步的,所述家电冷轧低碳钢带力学性能满足:屈服强度220~300MPa,抗拉强度≥270MPa,延伸率≥38.0%。
进一步的,所述连铸的铸坯厚度为230mm,热轧厚度2.0mm≤h≤6.0mm。
进一步的,所述冷轧厚度为0.5~2.5mm。
与现有技术相比,本发明的有益技术效果:
本发明的合金成本和工序成本均较低,仅在普通冷轧低碳钢板的基础上,在不考虑添加合金元素Nb、Ti元素的基础上,仅通过化学成分设计,热轧低温卷取,连续退火工艺和较高的平整延伸率,实现低成本,高性能的,完全满足家电与钢制家具领域的冷轧家电用低碳钢产品。确保了低成本和良好的综合性能平衡,提升冷轧家电用低碳钢的性价比,提高了钢厂的盈利能力。
附图说明
下面结合附图说明对本发明作进一步说明。
图1为成品金相组织。
具体实施方式
如图1所示,一种家电用冷轧低碳钢的制造方法,包括:
1.冶炼工艺
炼钢工序包括:铁水预处理-转炉顶底复吹冶炼-LF炉外精炼-板坯连铸-缓冷,其中转炉顶底复吹冶炼中进行吹氧脱碳升温,冶炼后期加入铝铁、锰铁脱氧合金化,控制P、S成分,防止钢液过氧化,出钢温度≥1620℃,转炉出钢P≤0.020%,S≤0.020%,上述LF炉外精炼采用LF全程吹氩工艺,精炼过程保持良好的还原气氛,采用铝粒造渣脱氧,LF后期根据钢水成分添加锰铁合金调整到目标成分。上述板坯连铸中钢水进中包温度控制在1556~1571℃,过热度25~40℃,拉速控制在1.00~1.60m/min。对铸坯进行低倍检验,低倍组织试片上不得有影响产品性能的缩孔、气泡、裂纹、夹杂、白点,连铸坯偏析不得大于B类1.0,中心疏松不得大于1级。
2热轧工艺
热轧工序包括:铸坯加热-高压水除磷-定宽压力机-E1R1粗轧机轧制-E2R2粗轧机轧制-飞剪-高压水除磷-F1~F7精轧机轧制-加密型层流冷却-卷取;该工序采用步进式加热炉加热炉加热铸坯(加热工艺见表1),粗轧采用双机架R1和R2往返式轧制,采用的粗轧模式为3+3,精轧采用F1~F7连轧工艺,具体热轧工艺见表2。
表1铸坯加热工艺
表2轧制工艺
3退火工艺
冷轧工序包括:酸轧开卷-焊接-拉矫-酸洗-漂洗-烘干-切边-连轧机器冷轧-分切-卷取;连退工序包括:连退开卷-焊接-清洗-入口活套-退火炉-出口活套-平整-检查活套-切边-表面检查-涂油-卷取-称重-取样、检验-包装。连退工序的具体工艺见表3。
表3退火工艺
4实施例分析
4.1炼钢成分
根据以上的炼钢工艺要求,实际板坯化学成分(质量百分比)如下表4所示。
表4实例化学成分wt.%
4.2热轧工艺
根据以上的热轧工艺要求,热轧厚度4.5mm、6.0mm,实际工艺如表5所示。
表5热轧工艺
4.3连退工艺
根据以上的连退工艺要求,冷轧厚度1.0mm、2.0mm,实际工艺如表6所示。
表6连退工艺
通过以上工艺获得的钢带产品力学性能情况见表7所示,试验方法参照GB/T228.1。
表7成品拉伸性能
综上所述工艺获得的家电用冷轧低碳钢产品,经广州美的客户使用,未发现冲压开裂情况,产品性能满足客户需求,屈服强度:220~300MP,抗拉强度≥270MPa,延伸率≥38.0%。成品金相组织为等轴铁素体,晶粒度8.5~9.0级,组织形貌见图1。
综上所述,本产品通过性能检验和用户使用各项性能满足需求,已经批量供货给广州美的客户
以上所述的实施例仅是对本发明的优选方式进行描述,并非对本发明的范围进行限定,在不脱离本发明设计精神的前提下,本领域普通技术人员对本发明的技术方案做出的各种变形和改进,均应落入本发明权利要求书确定的保护范围内。
Claims (7)
1.一种家电用冷轧低碳钢的制造方法,其特征在于:所述家电用冷轧低碳钢的化学成分重量百分比为:C:0.01~0.08%,Si:0.020~0.040%,Mn:0.20~0.40%,P:≤0.020%,S:≤0.015%,N:≤50ppm,其余为Fe和不可避免的杂质;
其生产工艺包括,转炉冶炼、连铸、热轧、酸洗、冷轧、连续退火和平整工序;所述热轧工序中,铸坯加热温度1210~1260℃,热轧加热温度1190~1220℃,均热温度1200~1220℃,在炉时间180~240min,均热时间30~60min,终轧温度860~910℃,卷取温度630~670℃。
2.根据权利要求1所述的家电用冷轧低碳钢的制造方法,其特征在于:所述冷轧工序中,冷轧压下率为62%以上。
3.根据权利要求1所述的家电用冷轧低碳钢的制造方法,其特征在于:所述连续退火的工序中,退火温度为740~790℃,过时效1温度350~400℃,过时效2温度300~375℃,终冷温度≤150℃。
4.根据权利要求1所述的家电用冷轧低碳钢的制造方法,其特征在于:所述平整工序中,平整机延伸率为0.7~1.2%。
5.根据权利要求1所述的家电用冷轧低碳钢的制造方法,其特征在于:所述家电冷轧低碳钢带力学性能满足:屈服强度220~300MPa,抗拉强度≥270MPa,延伸率≥38.0%。
6.根据权利要求1所述的家电用冷轧低碳钢的制造方法,其特征在于:所述连铸的铸坯厚度为230mm,热轧厚度2.0mm≤h≤6.0mm。
7.根据权利要求1所述的家电用冷轧低碳钢的制造方法,其特征在于:所述冷轧厚度为0.5~2.5mm。
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