CN113088794B - 低△r值IF钢热镀锌钢板及其制备方法 - Google Patents
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Abstract
本发明属于冶金技术领域,具体涉及低△r值IF钢热镀锌钢板及其制备方法。本发明所解决的技术问题是提供低△r值IF钢热镀锌钢板及其制备方法。本发明的制备方法包括冶炼、热轧、酸轧、退火、热镀锌工艺。本发明针对IF钢热镀锌钢板,通过对热轧、酸轧及热镀锌工艺中的参数进行严格控制,制备出强度较高且△r低于0.12的IF钢热镀锌钢板。
Description
技术领域
本发明属于冶金技术领域,具体涉及低△r值IF钢热镀锌钢板及其制备方法。
背景技术
随着我国国民经济建设的飞速发展,市场对高性能的热镀锌钢板要求不断提高,在保证其他性能的前提下,冲压成型性能高的热镀锌钢板已经成为各企业追求的目标,尤其在汽车、家电行业受到极大关注。其中,在提高热镀锌钢冲压成型性的现有文献中,具有代表性的专利为:
专利CN103958712A公开了深拉性优良的高强度热镀锌钢板及其制造方法,该钢板化学组分以重量百分比计为:C:0.010~0.04%、Si:1.0~1.5%、Mn:1.0~3.0%、P:0.005~0.1%、S:<0.01%、sol.A1:0.005~0.5%、N:<0.01%、Nb:0.010~0.05%、Ti:0.015~0.120%,并且钢中的Nb和C的含量(质量%)满足(Nb/93)/(C/12)<0.20的关系,进一步满足0.005<C*≤0.020,余量由Fe和不可避免的杂质构成。该钢板平均r值≥1.30,并且将r值的面内各向异性(Δr)以绝对值计在0.20以下,能够实现良好的深拉性和TS440MPa以上的高强度化。
尽管上述专利所公开的热镀锌钢板的平均r值≥1.30,各向异性(Δr)在0.2以下,但其冲压成型性能还有待进一步提高,才能满足现有市场对高性能热镀锌钢板要求。
发明内容
为解决上述现有技术存在的问题,本发明提供了低△r值IF钢热镀锌钢板的制备方法,包括以下步骤:
(1)冶炼工序:根据IF钢的化学成分进行冶炼成铸坯;所述IF钢的化学成分以重量百分比计包括:C:≤0.005%,Si:≤0.02%,Mn:0.10~0.15%,P:0.005~0.015%,S:0.005~0.015%,Ti:0.050~0.080%,Als:0.020%~0.070%,余量为Fe和不可避免杂质;
(2)热轧工序:将铸坯加热、除磷、粗轧、精轧、冷却、卷取后得热轧卷;其中,精轧开轧温度为910℃~940℃,终轧温度为770℃~800℃,卷取温度为610~650℃;
(3)酸轧工序:将热轧卷酸洗后冷轧成薄带钢;
(4)退火、热镀锌工序:薄带钢经过退火、热镀锌后,制成热镀锌钢板;其中,热镀锌工序中,退火结束后快冷至锌池炉鼻温度440~460℃,其快冷速率为10~50℃/s,镀锌时间7~30s,镀锌后以5~10℃/s的终冷速率冷却至室温。
优选地,步骤(1)冶炼工序中,所述IF钢的化学成分以重量百分比计包括:C:≤0.005%,Si:≤0.02%,Mn:0.10~0.14%,P:0.005~0.013%,S:0.005~0.013%,Ti:0.055~0.075%,Als:0.030%~0.065%,余量为Fe和不可避免杂质。
其中,步骤(2)热轧工序中,加热至1110℃~1150℃,在炉时间200~260min,采用5道次粗轧。
其中,步骤(3)酸轧工序中,冷轧压下率为75%~85%。
其中,步骤(4)退火工序中,加热温度为690~760℃,均热温度为780~810℃,缓冷温度为550~600℃。
其中,步骤(4)热镀锌工序中,炉内保护气氛露点温度为-25~-60℃。
有益效果:本发明针对IF钢热镀锌钢板,通过对热轧、酸轧及热镀锌工艺中的参数进行严格控制,制备出强度较高且△r低于0.12的IF钢热镀锌钢板。本发明IF钢热镀锌钢板Rp0.2为130~160MPa,抗拉强度280~330MPa,伸长率≥45.0%,r90≥2.4,n90≥0.23,r≥2.1,且本发明方法制备工艺简单,成本低,实现了低能耗生产。
具体实施方式
本发明提供了低△r值IF钢热镀锌钢板的制备方法,包括以下步骤:
(1)冶炼工序:根据IF钢的化学成分进行冶炼成铸坯,铸坯厚度为200mm;
(2)热轧工序:将铸坯加热至1110℃~1150℃,在炉时间200~260min,然后进行粗轧,粗轧采用5道次轧制,全长全数除磷,轧制过程投用保温罩,粗轧后中间板坯厚度39mm~43mm;粗轧后进行精轧,精轧开轧温度910℃~940℃,终轧温度为770℃~800℃;精轧后自然冷却到610~650℃进行卷取得热轧卷,此时钢板厚度3.5mm;
(3)酸轧工序:将热轧卷酸洗后冷轧成薄带钢,冷轧压下率为75%~85%;
(4)退火、热镀锌工序:将上述冷轧薄带钢经过退火、热镀锌后,制成所需热镀锌钢板;所述退火工序分为加热、均热、缓冷三个阶段,加热温度为690~760℃,均热温度为780~810℃,缓冷温度为550~600℃;其中,加热阶段目的是使板坯能有一个缓冲过程进入均热,均热阶段即为实际退火阶段,缓冷阶段目的是使板坯有一个缓冲过程进行热镀锌,从而保证板坯质量。
热镀锌工序中,炉内保护气氛露点温度为-25~-60℃,退火结束后快冷至锌池炉鼻温度440~460℃,其快冷速率为10~50℃/s,镀锌时间为7~30s,镀锌后以5~10℃/s的终冷速率冷却至室温。
Δr值表示各向异性系数r值在板面上随方向的变化,在圆柱杯件冲压成形时,这种变化导致侧壁高度不同(称凸耳)。Δr值的大小决定了杯型拉深件上边凸耳的形成程度。
Δr值定义为:Δr=(r0-2r45+r90)/2
式中,下标0、45、90表示单向拉伸试样的取向与板料轧制方向的夹角。
Δr值愈大,板面内各向异性愈严重,表现在拉伸件边沿不齐形成凸耳,且壁厚不均加重,影响成形件质量。Δr>0,拉深件凸耳在0°和90°方向;Δr<0,拉深件凸耳在45°方向。
板料相对于各向异性的方向,对矩形拉深件有重要作用,最好将r值大的方向指向矩形四角,因四角是要求r值大的真正拉深性能的成形。大多数低碳铝镇静钢冷轧钢板的最大r值垂直于轧制方向,使矩形拉深件毛坯四角摆在这个方向会造成大量废料。而IF钢板通常在与轧制方向成45°方向的r值较大,故适于矩形拉深件。且IF钢具有低强度、高延伸、无时效的特点,在冲压时各个方向的材料流动均匀,各向异性较好。因此,本发明选用IF钢的化学成分进行冶炼成铸坯;所述IF钢的化学成分以重量百分比计包括:C:≤0.005%,Si:≤0.02%,Mn:0.10~0.15%,P:0.005~0.015%,S:0.005~0.015%,Ti:0.050~0.080%,Als:0.020%~0.070%,余量为Fe和不可避免杂质。
优选地,所述IF钢的化学成分以重量百分比计包括:C:≤0.005%,Si:≤0.02%,Mn:0.10~0.14%,P:0.005~0.013%,S:0.005~0.013%,Ti:0.055~0.075%,Als:0.030%~0.065%,余量为Fe和不可避免杂质。
本发明热轧工序中,粗轧目的是在低温下进行奥氏体变形,因此将铸坯加热至1110℃~1150℃,在炉时间200~260min,然后进行粗轧,粗轧采用5道次轧制,全长全数除磷,轧制过程投用保温罩。
本发明热轧工序中,精轧开轧温度控制910℃~940℃是为了在铁素体区变形,得到变形的热轧态组织。低温终轧温度为770℃~800℃能显著提升热轧态的{111}织构的比例,冷轧过程得到织构遗传,生成较多的{111}织构有利于△r值的优良。
酸轧过程变形进一步积累,经退火后得到均匀的组织。
炉内保护气氛露点温度是炉内保护气体中含水量的标志,温度过高,带钢表面要被氧化;温度过低,带钢表面氧化还原不彻底,最终表面质量变差,因此,本发明炉内保护气氛露点温度为-25~-60℃。
加热温度的制定根据均热温度和炉内自身温度,如果温度过低,炉内就要降温,很难实现;温度过高,直接影响后续均热温度的满足要求,因此本发明退火工艺中加热温度为690~760℃。
均热温度是根据带钢的再结晶温度范围确定的,温度过低,带钢组织未再结晶,冲压过程容易开裂;温度过高,再结晶完成后晶粒继续过分长大,冲压过程会出现橘皮开裂,因此本发明退火工艺中均热温度为780~810℃。
缓冷温度是根据产品组织调控和入锌锅温度而制定,IF钢不存在组织变化,但是要考虑入锌锅温度,炉鼻温度是根据锌锅温度而定,锌锅温度是要保证锌液温度和带钢运行顺行。快冷速度是根据机组装备和均热温度到缓冷温度之间的温度和带钢速度而制定。镀锌时间是根据带钢速度而制定。因此,综合考虑,本发明退火工艺中缓冷温度为550~600℃,退火结束后快速冷却至锌池炉鼻温度440~460℃,其快冷速率CR1为10~50℃/s,镀锌时间为7~30s,镀锌后以5~10℃/s的终冷速率CR2冷却至室温。
实施例
以下通过实施例和对比例对本发明作进一步的解释和说明。
以下实施例及对比例按表1的化学成分冶炼成铸坯,铸坯厚度为200mm;
将铸坯加热,在炉时间255min后粗轧,粗轧采用5道次轧制,全长全数除磷,轧制过程投用保温罩,粗轧后中间板坯厚度42.0mm;
粗轧后将板坯进行精轧,精轧后自然冷却到卷取温度进行卷取,得到钢板厚度为3.5mm;
将热轧卷酸洗后,冷轧成薄带钢,其中冷轧压下率为80.0%;
最后通过退火、热镀锌工艺得到IF钢热镀锌钢板。其中,退火温度指的是均热温度。
其中,热轧、退火过程具体工艺参数分别如表2、3所示,所得热镀锌钢板力学性能如表4所示。
表1热镀锌钢板化学成分
编号 | C | Si | Mn | P | S | Als | Ti |
实施例1 | 0.0025 | 0.004 | 0.12 | 0.010 | 0.007 | 0.035 | 0.060 |
实施例2 | 0.0028 | 0.005 | 0.13 | 0.011 | 0.006 | 0.033 | 0.062 |
对比例1 | 0.0035 | 0.01 | 0.10 | 0.012 | 0.008 | 0.043 | 0.066 |
对比例2 | 0.0032 | 0.01 | 0.11 | 0.012 | 0.009 | 0.038 | 0.065 |
表2热轧主要工艺参数
编号 | 加热温度/℃ | 精轧温度/℃ | 终轧温度/℃ | 卷取温度/℃ |
实施例1 | 1130 | 920 | 779 | 650 |
实施例2 | 1126 | 922 | 775 | 649 |
对比例1 | 1233 | 1035 | 934 | 757 |
对比例2 | 1238 | 1036 | 938 | 748 |
表3退火主要工艺参数
表4热镀锌钢板力学性能
Claims (4)
1.低△r值IF钢热镀锌钢板的制备方法,其特征在于:包括以下步骤:
(1)冶炼工序:根据IF钢的化学成分进行冶炼成铸坯;所述IF钢的化学成分以重量百分比计包括:C:≤0.005%,Si:≤0.02%,Mn:0.10~0.15%,P:0.005~0.015%,S:0.005~0.015%,Ti:0.050~0.080%,Als:0.020%~0.070%,余量为Fe和不可避免杂质;
(2)热轧工序:将铸坯加热、除磷、粗轧、精轧、冷却、卷取后得热轧卷;其中,将铸坯加热至1110℃~1150℃,在炉时间200~260min,采用5道次粗轧,粗轧后精轧;精轧开轧温度为910℃~940℃,终轧温度为770℃~800℃,卷取温度为610~650℃;
(3)酸轧工序:将热轧卷酸洗后冷轧成薄带钢;其中,冷轧压下率为75%~85%;
(4)退火、热镀锌工序:薄带钢经过退火、热镀锌后,制成热镀锌钢板;其中,退火工序中,加热温度为690~760℃,均热温度为780~810℃,缓冷温度为550~600℃;
热镀锌工序中,退火结束后快冷至锌池炉鼻温度440~460℃,其快冷速率为10~50℃/s,镀锌时间7~30s,镀锌后以5~10℃/s的终冷速率冷却至室温。
2.根据权利要求1所述的低△r值IF钢热镀锌钢板的制备方法,其特征在于:步骤(1)冶炼工序中,所述IF钢的化学成分以重量百分比计包括:C:≤0.005%,Si:≤0.02%,Mn:0.10~0.14%,P:0.005~0.013%,S:0.005~0.013%,Ti:0.055~0.075%,Als:0.030%~0.065%,余量为Fe和不可避免杂质。
3.根据权利要求1或2所述的低△r值IF钢热镀锌钢板的制备方法,其特征在于:步骤(4)热镀锌工序中,炉内保护气氛露点温度为-25~-60℃。
4.权利要求1~3任一项所述的低△r值IF钢热镀锌钢板的制备方法制备的IF钢热镀锌钢板。
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