CN110038898B - 一种1500MPa级热成型高强钢生产工艺 - Google Patents
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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Abstract
本发明涉及冶金轧钢之冷轧罩退技术领域,具体是提供了一种1500MPa级热成型高强钢生产工艺,通过优化轧机各机架载荷分配及按原料板型曲线有针对性地调整轧制方案以提高板型控制质量,优化罩式退火炉工艺提高产品性能,优化轧机平整工艺降低平整擦伤几率,可解决因平整擦伤和板型控制不良造成产品合格率低的问题,产品合格率得到大幅提升,可带来可观的经济效益。
Description
技术领域
本发明涉及冷轧罩退技术领域,特别是涉及一种1500MPa级热成型高强钢生产工艺。
背景技术
冷轧罩退技术领域,热成形技术是一项专门用于生产成形高强度冲压件用钢板的新技术,目前最大可以生产成形强度高达1500MPa的冲压件用钢板,而且这种在高温下成形的板材几乎没有回弹,具有产品成形精度高、成形性能好等优点,业已引起业界的普遍关注并迅速发展成为汽车板材制造领域的一项热门技术。但是,该技术对板材表面、板型等实物质量控制的要求较高。目前,在实际生产过程中,由于对板材的表面、板型等实物质量控制不稳定,导致产品的合格率较低。以鞍钢为例,目前1500MPa级热成型高强钢产品的合格率仅为71.8%。
经大量的分析研究,并经生产实践验证,造成1500MPa级热成型钢质量不合格的主要因素为平整擦伤和板型不良缺陷,亟需对这两个缺陷进行技术攻关,研究制定专项工艺措施以提高产品合格率。
发明内容
为克服现有技术缺陷,本发明解决的技术问题是提供一种1500MPa级热成型高强钢生产工艺,通过优化轧机各机架载荷分配及按原料板型曲线有针对性地调整轧制方案以提高板型控制质量,优化罩式退火炉工艺提高产品性能,优化轧机平整工艺降低平整擦伤几率,可解决因平整擦伤和板型控制不良造成产品合格率低的问题。
为了达到上述目的,本发明采用以下技术方案实现:
一种1500MPa级热成型高强钢生产工艺,其特征在于,包括以下步骤:
1)板型缺陷控制
(1)负荷分配控制,优化轧机各机架负荷分配,提高第1机架、第2机架的轧制压缩比,其中第1机架的最佳负荷为22-24%、第2机架的最佳负荷为25-28%;降低第3机架、第4机架的轧制压缩比;第5机架采用恒轧制力的方式进行轧制,仅作为平整机使用,单位轧制力控制在5-5.5MN/m;
项目 | 1#,% | 2#,% | 3#,% | 4#,% | 5#,MN/m |
轧制方式 | 3 | 3 | 3 | 3 | 2 |
比例分配 | 22-24% | 25-28% | 20-22% | 18-19% | 5-5.5MN |
(2)根据原料板型曲线有针对性地调整轧制方案:
对原料板型存在明显的边浪,轧机生产时加大前4架工作辊、中间辊弯辊值在0.6-0.8MN之间,第5架板形目标曲线设定为微中浪;
对原料板型存在明显的中浪,轧机生产时减小前4架工作辊、中间辊弯辊值在0.4-0.6MN之间,第5架板形目标曲线设定为微边浪;
对原料板型存在复合浪,控制前4架工作辊弯辊值在0.2-0.4MN之间,中间辊弯辊值在0.8-1.0MN之间,第5架板形目标曲线设定为平直;
2)性能控制
罩式退火炉工艺执行的退火制度为:
(1)加热自400℃至660℃,加热用时控制在6-8h;
(2)加热至660℃时,停止加热,保温5-7h;
(3)660℃保温结束后,带罩保温2-4h;
3)平整擦伤缺陷控制
(1)平整速度控制,平整速度控制范围220~300m/min;
(2)张力控制,平整头部张力控制范围16.5~18.5N/mm2,尾部张力控制范围19.5~24N/mm2
与现有技术相比,本发明的有益效果是:
1)通过优化轧机各机架载荷分配及按原料板型曲线有针对性地调整轧制方案可提高板型控制质量,优化罩式退火炉工艺提高产品性能,优化轧机平整工艺降低平整擦伤几率,可解决因平整擦伤和板型控制不良造成产品合格率低的问题;
2)产品合格率明显提高,以鞍钢为例,采用该发明工艺后,产品合格率由原来的71.8%提高至90.6%,提高了18.8%;
3)经济效益可观,以鞍钢为例,采用该发明工艺后,按年生产量10000吨计算,吨钢降级损失按500元计,则年可经济效益=10000吨x18.8%x 500元/吨=94万元。
附图说明
图1是本发明之退火曲线示意图。
具体实施方式
下面结合附图对本发明的具体实施方式作进一步说明:
见图1所示,本发明涉及的一种1500MPa级热成型高强钢生产工艺,在执行正常工艺前提下,优化了以下内容:
一种1500MPa级热成型高强钢生产工艺,包括以下步骤:
1)板型缺陷控制
(1)负荷分配控制,采取C方式轧制,优化轧机各机架负荷分配,提高第1机架、第2机架的轧制压缩比,在加工硬化程度不是很强的时候完成较大轧制量,其中第1机架的最佳负荷为22-24%、第2机架的最佳负荷为25-28%;降低第3机架、第4机架的轧制压缩比,在加工硬化程度很强的时候完成较小轧制量;第5机架采用恒轧制力的方式进行轧制,仅作为平整机使用,单位轧制力控制在5-5.5MN/m,从而获得较好板形;
项目 | 1#,% | 2#,% | 3#,% | 4#,% | 5#,MN/m |
轧制方式 | 3 | 3 | 3 | 3 | 2 |
比例分配 | 22-24% | 25-28% | 20-22% | 18-19% | 5-5.5MN |
(2)根据原料板型曲线有针对性地调整轧制方案:
对原料板型存在明显的边浪,轧机生产时加大前4架工作辊、中间辊弯辊值在0.6-0.8MN之间,第5架板形目标曲线设定为微中浪;
对原料板型存在明显的中浪,轧机生产时减小前4架工作辊、中间辊弯辊值在0.4-0.6MN之间,第5架板形目标曲线设定为微边浪;
对原料板型存在复合浪,控制前4架工作辊弯辊值在0.2-0.4MN之间,中间辊弯辊值在0.8-1.0MN之间,第5架板形目标曲线设定为平直;
2)性能控制
罩式退火炉工艺执行的退火制度为:
(1)加热自400℃至660℃,加热用时控制在6-8h;
(2)加热至660℃时,停止加热,保温5-7h;
(3)660℃保温结束后,带罩保温2-4h;
3)平整擦伤缺陷控制
(1)平整速度控制,平整速度控制范围220~300m/min;
(2)张力控制,平整头部张力控制范围16.5~18.5N/mm2,尾部张力控制范围19.5~24N/mm2
以上所述,仅为本发明的具体实施方式之一,本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。
Claims (1)
1.一种1500MPa级热成型高强钢生产工艺,其特征在于,包括以下步骤:
1)板型缺陷控制
(1)负荷分配控制,优化轧机各机架负荷分配,提高第1机架、第2机架的轧制压缩比,其中第1机架的最佳负荷为22-24%、第2机架的最佳负荷为25-28%;降低第3机架、第4机架的轧制压缩比;其中第3机架的最佳负荷为20-22%、第4机架的最佳负荷为18-19%;第5机架采用恒轧制力的方式进行轧制,仅作为平整机使用,单位轧制力控制在5-5.5MN/m;
(2)根据原料板型曲线有针对性地调整轧制方案:
对原料板型存在明显的边浪,轧机生产时加大前4架工作辊、中间辊弯辊值在0.6-0.8MN之间,第5架板形目标曲线设定为微中浪;
对原料板型存在明显的中浪,轧机生产时减小前4架工作辊、中间辊弯辊值在0.4-0.6MN之间,第5架板形目标曲线设定为微边浪;
对原料板型存在复合浪,控制前4架工作辊弯辊值在0.2-0.4MN之间,中间辊弯辊值在0.8-1.0MN之间,第5架板形目标曲线设定为平直;
2)性能控制
罩式退火炉工艺执行的退火制度为:
(1)加热自400℃至660℃,加热用时控制在6-8h;
(2)加热至660℃时,停止加热,保温5-7h;
(3)660℃保温结束后,带罩保温2-4h;
3)平整擦伤缺陷控制
(1)平整速度控制,平整速度控制范围220~300m/min;
(2)张力控制,平整头部张力控制范围16.5~18.5N/mm2,尾部张力控制范围19.5~24N/mm2。
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