CN116200651A - 一种260MPa级冲压用冷轧搪瓷钢及其制造方法 - Google Patents

一种260MPa级冲压用冷轧搪瓷钢及其制造方法 Download PDF

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CN116200651A
CN116200651A CN202211089485.7A CN202211089485A CN116200651A CN 116200651 A CN116200651 A CN 116200651A CN 202211089485 A CN202211089485 A CN 202211089485A CN 116200651 A CN116200651 A CN 116200651A
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惠鑫
张奇
杨源远
董丽丽
岳祎楠
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Baotou Iron and Steel Group Co Ltd
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Abstract

本发明公开了一种260MPa级冲压用冷轧搪瓷钢,其化学成分的质量百分含量为:C:0.01~0.03%,Si:≤0.03%,Mn:0.10~0.25%,P:≤0.015%,S:≤0.0010%,Alt:0.020~0.050%,N:≤0.0040%,Ti:0.030~0.050%。还公布了其制备方法。本发明的冷轧搪瓷钢的金相显微组织为铁素体,晶粒度8~9级,屈服强度220~270MPa,抗拉强度320~360MPa,延伸率A80达到38~44%,氢渗透系数Dap=4.5×10‑7cm2/s,远远低于搪瓷钢要求的2.0×10‑6cm2/s的临界值,具有良好的抗鳞爆性能。

Description

一种260MPa级冲压用冷轧搪瓷钢及其制造方法
技术领域
本发明涉及冶金板材生产技术领域,尤其涉及一种260MPa级冲压用冷轧搪瓷钢及其制造方法。
背景技术
搪瓷制品具有金属的牢固性和玻璃的耐用性及装饰性,是一种性能先进的复合材料。由于其具有耐腐烛、耐酸碱、耐高温、易洗漆、无毒、无味、光滑耐磨、卫生清洁等良好的特性,是许多其他产品无法替代的,因此被广泛用于家用电器、厨房用具、建筑搪瓷和卫生设备等。搪瓷用钢作为一种搪瓷制品专用产品有着广泛的应用空间,主要用于制造厨房用品如搪瓷锅和搪瓷盆、内外建筑装饰、家电产品如电热取暖器和热水器等。随着搪瓷制品应用领域的扩充,要求搪瓷钢板在满足成形性能、抗鳞爆性能、密着性能等前提下拥有不同级别的强度等级。
发明内容
本发明的目的是提供一种260MPa级冲压用冷轧搪瓷钢及其制造方法,所制备的260MPa级冷轧搪瓷钢具有良好的抗疲劳性、成形性、贮氢性能,满足家电行业搪瓷零部件制作需求,化学成分和力学性能满足《GB/T 13790-2008搪瓷用冷轧低碳钢板及钢带》中DC01EK的要求。
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260MPa级冲压用冷轧搪瓷钢,其化学成分的质量百分含量为:C:0.01~0.03%,Si:≤0.03%,Mn:0.10~0.25%,P:≤0.015%,S:≤0.0010%,Alt:0.020~0.050%,N:≤0.0040%,Ti:0.030~0.050%,其余为Fe及不可避免的杂质。
进一步的,其化学成分的质量百分含量为:C:0.02%,Si:0.03%,Mn:0.15%,P:0.015%,S:0.002%,Alt:0.034%,N:0.0033%,Ti:0.036%,其余为Fe及不可避免的杂质。
进一步的,其化学成分的质量百分含量为:C:0.02%,Si:0.01%,Mn:0.17%,P:0.011%,S:0.005%,Alt:0.041%,N:0.0031%,Ti:0.033%,其余为Fe及不可避免的杂质。
进一步的,其化学成分的质量百分含量为:C:0.03%,Si:0.02%,Mn:0.20%,P:0.012%,S:0.005%,Alt:0.042%,N:0.0037%,Ti:0.041%,其余为Fe及不可避免的杂质。
一种260MPa级冲压用冷轧搪瓷钢的制造方法,包括如下步骤:
(1)冶炼—连铸生产工艺流程:铁水预处理—转炉—RH精炼—铸机;供铸机钢水成分为C:0.01~0.03%,Si:≤0.03%,Mn:0.10~0.25%,P:≤0.015%,S:≤0.0010%,Alt:0.020~0.050%,N:≤0.0040%,Ti:0.030~0.050%;
(2)热轧生产工艺流程:铸坯加热—粗轧—精轧—卷取;铸坯出炉温度1190~1210℃,所述粗轧采用2机架轧机粗轧,精轧采用7机架连续变凸度轧机精轧;所述精轧的终轧温度为875~905℃,热轧钢带厚度5mm;冷却采用U型冷却方式,卷取温度为680~720℃;
(3)酸洗冷轧工艺流程:将热轧带钢经i-BOX技术盐酸槽酸洗,去除表面氧化铁皮后,经过5机架冷轧机冷轧,冷轧压下率为70%,轧至目标厚度1.5mm;
(4)连续退火工艺流程:将冷硬卷钢带开卷,退火工序的加热及均热温度为750~770℃,缓冷温度为600~700℃,过时效温度为300~400℃,平整延伸率设定为1.1~1.3%。
与现有技术相比,本发明的有益技术效果:
本发明的冷轧搪瓷钢的金相显微组织为铁素体,晶粒度8~9级,屈服强度220~270MPa,抗拉强度320~360MPa,延伸率A80达到38~44%,氢渗透系数Dap=4.5×10-7cm2/s,远远低于搪瓷钢要求的2.0×10-6cm2/s的临界值,具有良好的抗鳞爆性能。采用本发明提供的方法生产的冷轧搪瓷钢性能均达到相关技术标准要求。
附图说明
下面结合附图说明对本发明作进一步说明。
图1为实施例1氢渗透曲线。
具体实施方式
以下通过具体实施例对本发明作更详细的描述。实施例仅仅是对本发明最佳实施方式的描述,并不对本发明的范围有任何限制。
实施例1
将铁水进行脱硫预处理,采用顶底复吹转炉冶炼使铁水脱碳、脱磷得到钢水,转炉冶炼全程吹氩,废钢加入转炉,转炉出钢温度1662℃。然后将转炉冶炼后钢水进行RH炉外精炼,精炼就位温度1598℃,RH炉外精炼进行测温和成分微调,RH炉外精炼供铸机化学成分如表1所示。板坯连铸过热度为32℃,之后进行板坯清理、缓冷,及连铸坯质量检查。板坯加热温度为1201℃,加热的时间为237min,将加热后的板坯进行高压水除磷。通过定宽压力机定宽,采用2机架粗轧,7机架CVC精轧。精轧终轧温度为901℃,成品厚度5.5mm。层流冷却采用“U型”冷却冷却,钢带温度降低到711℃进行卷取。将热轧带钢经盐酸槽酸洗,该酸槽采用MH最新开发的i-BOX技术,操作和维护大大简化,节省能源和劳动力,热轧带钢去除表面氧化铁皮后,经过5机架UCM轧机冷轧,冷轧压下率为67%,轧至目标厚度1.8mm。冷硬卷连续退火在具有HGJC功能的连续立式退火炉中进行,钢带运行速度131m/min,均热温度771℃,缓冷温度601℃,平整延伸率1.4%。最后进行产品性能检测。
实施例2
将铁水进行脱硫预处理,采用顶底复吹转炉冶炼使铁水脱碳、脱磷得到钢水,转炉冶炼全程吹氩,废钢加入转炉,转炉出钢温度1665℃。然后将转炉冶炼后钢水进行RH炉外精炼,精炼就位温度1607℃,RH炉外精炼进行测温和成分微调,RH炉外精炼供铸机化学成分如表1所示。板坯连铸过热度为33℃,之后进行板坯清理、缓冷,及连铸坯质量检查。板坯加热温度为1205℃,加热的时间为231min,将加热后的板坯进行高压水除磷。通过定宽压力机定宽,采用2机架粗轧,7机架CVC精轧。精轧终轧温度为888℃,成品厚度5.5mm。层流冷却采用“U型”冷却冷却,钢带温度降低到709℃进行卷取。将热轧带钢经盐酸槽酸洗,该酸槽采用MH最新开发的i-BOX技术,操作和维护大大简化,节省能源和劳动力,热轧带钢去除表面氧化铁皮后,经过5机架UCM轧机冷轧,冷轧压下率为67%,轧至目标厚度1.8mm。冷硬卷连续退火在具有HGJC功能的连续立式退火炉中进行,钢带运行速度130m/min,均热温度764℃,缓冷温度601℃,平整延伸率1.4%。最后进行产品性能检测。
实施例3
将铁水进行脱硫预处理,采用顶底复吹转炉冶炼使铁水脱碳、脱磷得到钢水,转炉冶炼全程吹氩,废钢加入转炉,转炉出钢温度1662℃。然后将转炉冶炼后钢水进行RH炉外精炼,精炼就位温度1604℃,RH炉外精炼进行测温和成分微调,RH炉外精炼供铸机化学成分如表1所示。板坯连铸过热度为35℃,之后进行板坯清理、缓冷,及连铸坯质量检查。板坯加热温度为1203℃,加热的时间为222min,将加热后的板坯进行高压水除磷。通过定宽压力机定宽,采用2机架粗轧,7机架CVC精轧。精轧终轧温度为892℃,成品厚度5.5mm。层流冷却采用“U型”冷却,钢带温度降低到708℃进行卷取。将热轧带钢经盐酸槽酸洗,该酸槽采用MH最新开发的i-BOX技术,操作和维护大大简化,节省能源和劳动力,热轧带钢去除表面氧化铁皮后,经过5机架UCM轧机冷轧,冷轧压下率为67%,轧至目标厚度1.8mm。冷硬卷连续退火在具有HGJC功能的连续立式退火炉中进行,钢带运行速度130m/min,均热温度765℃,缓冷温度605℃,平整延伸率1.4%。最后进行产品性能检测。
表1本发明实施例1~3的化学成分(wt%)
实施例 C Si Mn P S Alt N Ti
1 0.02 0.03 0.15 0.015 0.002 0.034 0.0033 0.036
2 0.02 0.01 0.17 0.011 0.005 0.041 0.0031 0.033
3 0.03 0.02 0.20 0.012 0.005 0.042 0.0037 0.041
对本发明实施例1~3的钢卷进行力学性能检验,检验结果见表2。
表2本发明实施例1~3的钢卷的力学性能
Figure BDA0003836450950000051
表2中实施例均采用双电解池法进行氢渗透试验,测试钢板的贮氢性能,结果表明钢板氢渗透系数为4.0~4.9×10-7cm2/s,远远低于搪瓷钢2.0×10-6cm2/s的临界值,说明钢板具有良好的抗鳞爆性能。
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 (5)

1.一种260MPa级冲压用冷轧搪瓷钢,其特征在于:其化学成分的质量百分含量为:C:0.01~0.03%,Si:≤0.03%,Mn:0.10~0.25%,P:≤0.015%,S:≤0.0010%,Alt:0.020~0.050%,N:≤0.0040%,Ti:0.030~0.050%,其余为Fe及不可避免的杂质。
2.根据权利要求1所述的260MPa级冲压用冷轧搪瓷钢,其特征在于:其化学成分的质量百分含量为:C:0.02%,Si:0.03%,Mn:0.15%,P:0.015%,S:0.002%,Alt:0.034%,N:0.0033%,Ti:0.036%,其余为Fe及不可避免的杂质。
3.根据权利要求1所述的260MPa级冲压用冷轧搪瓷钢,其特征在于:其化学成分的质量百分含量为:C:0.02%,Si:0.01%,Mn:0.17%,P:0.011%,S:0.005%,Alt:0.041%,N:0.0031%,Ti:0.033%,其余为Fe及不可避免的杂质。
4.根据权利要求1所述的260MPa级冲压用冷轧搪瓷钢,其特征在于:其化学成分的质量百分含量为:C:0.03%,Si:0.02%,Mn:0.20%,P:0.012%,S:0.005%,Alt:0.042%,N:0.0037%,Ti:0.041%,其余为Fe及不可避免的杂质。
5.根据权利要求1-4任一项所述的260MPa级冲压用冷轧搪瓷钢的制造方法,其特征在于:包括如下步骤:
(1)冶炼—连铸生产工艺流程:铁水预处理—转炉—RH精炼—铸机;供铸机钢水成分为C:0.01~0.03%,Si:≤0.03%,Mn:0.10~0.25%,P:≤0.015%,S:≤0.0010%,Alt:0.020~0.050%,N:≤0.0040%,Ti:0.030~0.050%;
(2)热轧生产工艺流程:铸坯加热—粗轧—精轧—卷取;铸坯出炉温度1190~1210℃,所述粗轧采用2机架轧机粗轧,精轧采用7机架连续变凸度轧机精轧;所述精轧的终轧温度为875~905℃,热轧钢带厚度5mm;冷却采用U型冷却方式,卷取温度为680~720℃;
(3)酸洗冷轧工艺流程:将热轧带钢经i-BOX技术盐酸槽酸洗,去除表面氧化铁皮后,经过5机架冷轧机冷轧,冷轧压下率为70%,轧至目标厚度1.5mm;
(4)连续退火工艺流程:将冷硬卷钢带开卷,退火工序的加热及均热温度为750~770℃,缓冷温度为600~700℃,过时效温度为300~400℃,平整延伸率设定为1.1~1.3%。
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