CN113560340B - 一种改善吉帕级高强钢表面色差的方法 - Google Patents
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
本发明涉及一种改善吉帕级高强钢表面色差的方法，1)控制粗轧除鳞水压力，保证粗轧钢板表面无铁皮产生；2)控制精轧除鳞水压力，保证精轧钢板表面无铁皮产生；3)控制热轧卷取温度，使热轧带钢表面氧化铁皮的厚度小于20um；4)控制酸洗段拉矫延伸率，增加氧化铁皮裂纹数量及深度，使带钢表面氧化铁皮快速剥离；5)控制酸洗段酸洗液温度，并保证酸洗段酸洗液与带钢表面氧化铁皮的反应时间在90S以上，彻底清除带钢表面氧化铁皮。本发明消除成品带钢表面色差缺陷。使用此方法后，冷轧吉帕级高强钢由于表面色差缺陷造成的降级率为0。
Description
技术领域
本发明涉及冷轧技术领域，特别涉及一种改善吉帕级高强钢表面色差的方法。
背景技术
近年来，随着我国汽车工业的快速发展以及汽车保有量的不断增长，汽车的减重、节能、环保等备受人们普遍关注，车身轻量化通过采用冷轧吉帕级先进高强度钢使得钢板减薄，大幅减轻车身重量的同时保证其安全性。为保证冷轧吉帕级高强钢成品性能，需要添加Si、Mn等淬透性的元素，由于冷轧吉帕级高强钢中添加各种合金元素较多，造成热轧带钢基板表面的氧化铁皮厚薄、结构及特性较为特殊，因此酸洗不易洗净造成酸洗洗后表面质量较差，经过后续冷轧、退火或镀锌后成品无法消除，吉帕级高强钢成品带钢表面经常出现一种条带状色差缺陷，有时存在有较厚的氧化铁皮色差，该类色差缺陷在带钢表面大量的出现，不仅影响了产品的整体外观质量，也影响了产品后续涂渡等加工性能，导致最终客户无法使用，只能判废处理，严重影响冷轧吉帕级高强钢的市场推广使用。
现有公开的专利CN201910725145.0，《一种冷轧生产800MPa级DH钢的表面控制方法》，1.一种冷轧生产800MPa级DH钢的表面控制方法，步骤包括：将钢坯热轧卷曲、冷轧、镀锌，所述镀锌工艺中控制炉内露点温度为-25℃～-40℃，生产所述DH钢前将炉鼻子加湿关闭。2.生产所述DH钢前3.5～4.5小时将炉鼻子加湿关闭。3.所述热轧的终轧温度控制为870～910℃。4.所述热轧的终轧温度设定为890℃，并控制钢头尾温度波动在20℃以内。5.所述卷曲的温度控制为630～670℃。6.所述卷曲的温度设定为650℃，并控制钢头尾温度波动在20℃以内。7.所述钢坯成分为：以质量百分比计，C：0.16～0.18％，Mn：1.95～2.10％，Si：0.35～0.45％，P≤0.002％，S≤0.007％，余量为Fe和不可避免的杂质。
现有公开的专利CN201910208062.4，《一种高强钢的生产方法》，本发明公开了一种高强钢的生产方法。对钢种的成分进行了设计。具体为：1.添加Si元素进行强化，在加热后，添加界面出现锚状钉扎形貌，FeO包裹Fe2SiO4向钢基体内进行浸入，钉扎深度最深可达50μm，内侧铁皮粘附力较好，不易于基体脱落。还添加了Cr和Mo，降低了Si含量后的网状铁皮的形貌得到削弱。由于Mo元素的添加，在基体界面处存在Mo元素富集带。Mo元素较少参与内氧化质点的形成，起到封闭氧化界面的作用。通过添加P元素可显著改善铁皮的去除力。Fe-Si-O系统中含P可以降低该系氧化物的熔点，因此，添加P元素后可显著提高铁皮的去除力，从而降低铁皮的黏附力。本发明解决了存在色差缺陷的技术问题，能有效降低冷轧板色差缺陷的发生率，从而提高产品表面质量。一种高强钢的生产方法，其特征在于，包括：按质量百分比控制钢种的成分含量：控制Si含量小于0.3％，添加Cr元素在0.2％-0.5％，添加Mo元素在0.2％-0.5％，控制P元素在0.01％-0.04％进行炼钢，得到钢水；对得到的钢水进行连铸，得到板坯；对得到的板坯进行热轧；对轧制后的板坯进行连退。2.对所述得到的板坯进行加热、粗轧、精轧和卷取。3.在所述加热的过程中，将出炉温度控制在1180℃-1200℃，均热段时间控制在30min-35min，总在炉时间控制在150min-180min。4.在所述精轧的过程中，采用双道次除鳞工艺。5.在所述精轧的过程中，前三轧机机架间冷却水比例为50％，辊缝水开启比例达到80％。6.在所述卷取的过程中，采用前端密集冷却模式或者超快冷冷却模式对热轧板进行冷却。7.在所述卷取的过程中，将卷取温度控制在500℃-600℃。8.在所述对得到的板坯进行热轧之后，还包括：对热轧之后的板坯进行酸洗。9.在所述对热轧之后的板坯进行酸洗之后，还包括：对酸洗之后的板坯进行冷轧。10.在所述酸洗的过程中，将冷轧总体压下率控制在70％以内。
发明内容
本发明所要解决的技术问题是提供一种改善吉帕级高强钢表面色差的方法，降低因表面色差引起的降级率。
为实现上述目的，本发明采用以下技术方案实现：
一种改善吉帕级高强钢表面色差的方法，通过控制热轧工艺、酸洗工艺参数控制冷轧吉帕级高强钢表面色差，具体技术方案如下：
1)控制粗轧除鳞水压力，保证粗轧钢板表面无铁皮产生；
2)控制精轧除鳞水压力，保证精轧钢板表面无铁皮产生；
3)控制热轧卷取温度，使热轧带钢表面氧化铁皮的厚度小于20um；
4)控制酸洗段拉矫延伸率，增加氧化铁皮裂纹数量及深度，使带钢表面氧化铁皮快速剥离；
5)控制酸洗段酸洗液温度，并保证酸洗段酸洗液与带钢表面氧化铁皮的反应时间在90S以上，彻底清除带钢表面氧化铁皮。
步骤1)中粗轧除鳞箱除磷水压力控制在16-17MPa。
步骤2)中精轧除鳞箱除鳞水压力提升至18-19MPa。
步骤3)中热轧卷取温度降低至500-550℃。
步骤4)中酸洗段拉矫延伸率控制在0.5-0.6％。
步骤5)中酸洗段酸液温度控制在85-90℃，酸洗段酸洗速度控制在50-60m/min。
与现有的技术相比，本发明的有益效果是：
本发明针对冷轧高强钢调整热轧粗轧除磷水压力、精轧除磷水压力、卷取温度及冷轧酸洗拉矫延伸率、酸洗温度及酸洗速度工艺参数，进而消除成品带钢表面色差缺陷。使用此方法前，冷轧吉帕级高强钢由于表面色差缺陷造成的降级率为8％；使用此方法后，冷轧吉帕级高强钢由于表面色差缺陷造成的降级率为0。
具体实施方式
下面结合实施例对本发明进一步说明：
以下实施例对本发明进行详细描述。这些实施例仅是对本发明的最佳实施方案进行描述，并不对本发明的范围进行限制。
一种改善吉帕级高强钢表面色差的方法：
1)粗轧除鳞箱除磷水压力控制在16-17MPa，控制粗轧钢板表面无铁皮产生；
2)精轧除鳞箱除鳞水压力提升至18-19MPa，控制精轧钢板表面无铁皮产生；
3)热轧卷取温度降低至500-550℃，控制热轧带钢表面氧化铁皮的厚度小于20um；
4)酸洗段拉矫延伸率控制在0.5-0.6％，增加氧化铁皮裂纹数量及深度，使带钢表面氧化铁皮快速剥离；提高带钢表面氧化铁皮的破磷效果；
5)酸洗段酸液温度控制在85-90℃，酸洗段酸洗速度控制在50-60m/min，保证酸液与带钢表面氧化铁皮的反应时间在90S以上，彻底清除带钢表面氧化铁皮，提高酸液酸洗效果。
实施例
钢种：CR550/980QP，抗拉强度1020MPa；
化学成分重量百分比：C：0.2％，Si：1.8％，Mn：2.0％，P：0.01％，S：0.001％,其余为Fe及不可避免的杂质。
生产工艺流程：冶炼-连铸-粗轧—精轧—卷取—拉矫—酸洗-轧制-退火。
改善吉帕级高强钢表面色差的方法，通过控制热轧工艺、酸洗工艺参数控制冷轧吉帕级高强钢表面色差，具体实施方案如下表：
| 项目 | 实施例1 | 实施例2 | 实施例3 | 实施例4 | 实施例5 |
| 粗轧除磷水压力，MPa | 16 | 16.3 | 16.5 | 16.8 | 17 |
| 精轧除鳞水压力，MPa | 18 | 18.5 | 18.6 | 19 | 18 |
| 卷取温度，℃ | 500 | 550 | 530 | 540 | 530 |
| 拉矫延伸率,％ | 0.5 | 0.6 | 0.55 | 0.6 | 0.5 |
| 酸液温度，℃ | 85 | 86 | 88 | 90 | 89 |
| 酸洗速度,m/min | 50 | 55 | 60 | 58 | 52 |
| 色差状况 | 无 | 无 | 无 | 无 | 无 |
。
Claims (1)
1.一种改善吉帕级高强钢表面色差的方法，其特征在于，通过控制热轧工艺、酸洗工艺参数控制冷轧吉帕级高强钢表面色差，高强钢化学成分重量百分比：C：0.2％，Si：1.8％，Mn：2.0％，P：0.01％，S：0.001％,其余为Fe及不可避免的杂质，抗拉强度1020MPa；
具体技术方案如下：
1)控制粗轧除鳞水压力，粗轧除鳞箱除磷水压力控制在16-17MPa；
2)控制精轧除鳞水压力，精轧除鳞箱除鳞水压力提升至18-19MPa；
3)控制热轧卷取温度，使热轧带钢表面氧化铁皮的厚度小于20um；热轧卷取温度降低至500-550℃；
4)控制酸洗段拉矫延伸率，增加氧化铁皮裂纹数量及深度，使带钢表面氧化铁皮快速剥离；酸洗段拉矫延伸率控制在0.5％-0.6％；
5)控制酸洗段酸洗液温度，酸洗段酸液温度控制在85-90℃，酸洗段酸洗速度控制在50-60m/min，保证酸洗段酸洗液与带钢表面氧化铁皮的反应时间在90S以上，彻底清除带钢表面氧化铁皮。
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