CN114178327B - 一种提高冷轧带钢表面光泽度的方法 - Google Patents
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Abstract
本发明涉及一种提高冷轧带钢表面光泽度的方法，1)碱清洗槽清洗通过脱脂反应，去除带钢表面部分油脂；对带钢表面油污润湿，渗透到油污内部，使之松散；2)1#刷洗槽清洗利用机械刷辊去除带钢表面的油脂和部分污物；3)电解清洗利用电流所产生的气泡去除带钢表面的部分污物，并分散开；4)2#刷洗槽清洗利用机械刷辊去除带钢表面的部分碱液和污物；5)热漂洗槽清洗利用热水清洗带钢表面残留碱液和污物；6)1#挤干辊清除带钢表面水分；7)1#热风烘干机清除带钢表面残留水分；8)退火炉退回；9)平整机平整。本发明使带钢反射率达到90％以上，满足高级别汽车外板对带钢表面光泽度的要求，带钢表面无色差，提升了带钢表面质量。
Description
技术领域
本发明涉及冷轧带钢连退生产领域，特别涉及一种提高冷轧带钢表面光泽度的方法。
背景技术
随着汽车工业的发展以及用户对汽车用板质量的不断提高，尤其是高表面等级汽车外板，国内外各汽车行业和制造厂家的技术标准均提出严格的基本技术指标要求，即产品两面中较好的一面不应有影响涂漆后的外观质量或电镀后的外观质量的缺陷。
冷轧带钢表面的清洁指标(残油和残铁量)是影响高级别汽车外板表面质量的关键因素之一，这就对带钢表面光泽度有着非常苛刻的要求，光泽度低会严重影响最终成品合格率，且易造成质量异议，不利于钢厂的品牌形象。
连退机组的清洗工艺段，为冷轧带钢在成品前经历的最后一步表面清洗工艺。清洗段的作用是清洗冷轧后带钢表面残留的乳化液和铁粉，为退火工艺提供表面清洁的带钢。清洁的带钢表面有利于保证带钢在入口活套内稳定运行，并减少退火炉内产生炉辊结馏。清洗段的清洗效果直接影响成品表面质量，是连退机组重点控制的工艺环节。
目前钢厂主要采用Scotch胶带粘贴清洗后的带钢表面，并通过测量胶带反射率来衡量带钢表面清洗效果。
发明内容
本发明所要解决的技术问题是提供一种提高冷轧带钢表面光泽度的方法，满足高级别汽车外板对带钢表面清洁性的要求，提升了带钢表面质量。
为实现上述目的，本发明采用以下技术方案实现：
一种提高冷轧带钢表面光泽度的方法，工艺流程为：碱清洗槽—1#刷洗槽—电解清洗槽—2#刷洗槽—热漂洗槽—1#挤干辊—1#热风烘干机-退火炉-平整机；具体步骤包括：
1)碱清洗槽清洗：碱液浓度30-40g/l，温度75-85℃，通过脱脂反应，去除带钢表面部分油脂；对带钢表面油污润湿，渗透到油污内部，使之松散；
2)1#刷洗槽清洗：碱液温度75-85℃，利用机械刷辊去除带钢表面的油脂和部分污物；
3)电解清洗：碱液浓度35-40g/l，温度75-85℃，电流密度C/dm2，利用电流所产生的气泡去除带钢表面的部分污物，并分散开；
4)2#刷洗槽清洗：水温75-85℃，利用机械刷辊去除带钢表面的部分碱液和污物；
5)热漂洗槽清洗：水温75-85℃，利用热水清洗带钢表面残留碱液和污物；
6)1#挤干辊清除带钢表面水分；
7)1#热风烘干机清除带钢表面残留水分；
8)退火炉：退火炉采用全辐射管加热立式连续退火炉，包括预热段、加热段、保温段、缓冷段、快冷段、过时效段、终冷段，指标：各段露点≤-20℃，各段H2含量≥5％，各段氧含量低于30ppm，加热段炉压100-300Pa，加热段和保温段温度850±10℃，各段速度150-180mpm；
9)平整机：采用单机架六辊UC平整机，平整机工作辊指标：工作辊毛化前Ra0.3-0.5μm，毛化后Ra≤2.5μm，RPc值≥85cm-1，平整机内采用平整液浓度≥3.0％。
与现有的技术相比，本发明的有益效果是：
本发明使带钢反射率达到90％以上，满足高级别汽车外板对带钢表面光泽度的要求，带钢表面无色差，提升了带钢表面质量。
附图说明
图1为本发明的清洗工艺图。
具体实施方式
下面结合附图对本发明的具体实施方式进一步说明：
一种提高冷轧带钢表面光泽度的方法，工艺流程为：碱清洗槽—1#刷洗槽—电解清洗槽—2#刷洗槽—热漂洗槽—1#挤干辊—1#热风烘干机-退火炉-平整机(如图1)。
清洗具体步骤包括：
1)碱清洗槽清洗：清洗前更换碱液，碱液浓度30-40g/l，温度75-85℃，通过脱脂反应，去除带钢表面部分油脂；对带钢表面油污润湿，渗透到油污内部，使之松散；
2)1#刷洗槽清洗：刷辊全部投入生产，碱液温度75-85℃，利用机械刷辊去除带钢表面的油脂和部分污物；
3)电解清洗：碱液浓度35-40g/l，温度75-85℃，电流密度C/dm2，利用电流所产生的气泡去除带钢表面的部分污物，并分散开；
4)2#刷洗槽清洗：刷辊全部投入生产，水温75-85℃，利用机械刷辊去除带钢表面的部分碱液和污物；
5)热漂洗槽清洗：水温75-85℃，利用热水清洗带钢表面残留碱液和污物；
6)1#挤干辊：挤干辊全部投入生产，清除带钢表面水分；
7)1#热风烘干机清除带钢表面残留水分；
8)退火炉：退火炉采用全辐射管加热立式连续退火炉，包括预热段、加热段、保温段、缓冷段、快冷段、过时效段、终冷段，指标：各段露点≤-20℃，各段H2含量≥5％，各段氧含量低于30ppm，加热段炉压100-300Pa，加热段和保温段温度850±10℃，各段速度150-180mpm；保证带钢表面完全再结晶，进一步改善带钢表面色差缺陷；
9)平整机：采用单机架六辊UC平整机，平整机工作辊毛化前Ra0.3-0.5μm，毛化后Ra≤2.5μm，RPc值≥85cm-1，平整机内采用平整液浓度≥3.0％，控制带钢板形和表面粗糙度，有效减少辊印缺陷，同时实现材质性能的优化。
实施例
冷轧带钢轧后工艺流程为：碱清洗槽—1#刷洗槽—电解清洗槽—2#刷洗槽—热漂洗槽—1#挤干辊—1#热风烘干机-退火炉-平整机
冷轧带钢清洗设备的工艺参数见表1；
表1：
1#挤干辊：挤干辊全部投入生产，清除带钢表面水分；
1#热风烘干机清除带钢表面残留水分。
退火炉：退火炉采用全辐射管加热立式连续退火炉，预热段露点-18℃、加热段露点-18℃、保温段露点-18℃、缓冷段露点-20℃、快冷段露点-20℃、过时效段露点-20℃、终冷段露点-20℃，各段H2含量5％，氧含量25ppm，加热段炉压260-300Pa，加热段和保温段温度850±10℃，各段速度170-180mpm；保证带钢表面完全再结晶，进一步改善带钢表面色差缺陷。
平整机：采用单机架六辊UC平整机，平整机工作辊毛化前Ra0.3-0.5μm，毛化后Ra1.5-2.0μm，RPc值≥85cm-1，平整机内采用平整液浓度3.0％，控制带钢板形和表面粗糙度，有效减少辊印缺陷，同时实现材质性能的优化。
带钢表面反射率见表2；
表2：
| 钢卷号 | 钢种 | 规格 | 反射率测量结果 |
| 0BW3F962000 | DC05 | 0.9*1826 | 96％ |
| 0BW3H505000 | DC06 | 0.7*1665 | 95％ |
| 0BW3H506000 | DC06 | 0.7*1665 | 92％ |
| 0BW3H500000 | DC06 | 0.7*1665 | 94％ |
| 0BW3H512000 | DC06 | 0.8*1272 | 95％ |
清洗后带钢表面反射率均达到了90％以上。
对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以对本发明进行改进与修饰，这些改进和修饰也落入本发明权利要求的保护范围内。以上所述，仅为本发明较佳的具体实施方式，但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 (2)
1.一种提高冷轧带钢表面光泽度的方法，工艺流程为：碱清洗槽—1#刷洗槽—电解清洗槽—2#刷洗槽—热漂洗槽—1#挤干辊—1#热风烘干机-退火炉-平整机；其特征在于，具体步骤包括：
1）碱清洗槽清洗：碱液浓度40g/l，温度80℃，通过脱脂反应，去除带钢表面部分油脂；对带钢表面油污润湿，渗透到油污内部，使之松散；
2）1#刷洗槽清洗：碱液温度83℃，利用机械刷辊去除带钢表面的油脂和部分污物；
3）电解清洗：碱液浓度36g/l，温度84℃，电流密度4C/dm2，利用电流所产生的气泡去除带钢表面的部分污物，并分散开；
4）2#刷洗槽清洗：水温79℃，利用机械刷辊去除带钢表面的部分碱液和污物；
5）热漂洗槽清洗：水温78℃，利用热水清洗带钢表面残留碱液和污物；
6）1#挤干辊清除带钢表面水分；
7）1#热风烘干机清除带钢表面残留水分；清洗后带钢表面反射率均达到了94%；
8）退火炉：退火炉采用全辐射管加热立式连续退火炉，预热段露点-18℃、加热段露点-18℃、保温段露点-18℃、缓冷段露点-20℃、快冷段露点-20℃、过时效段露点-20℃、终冷段露点-20℃，各段 H2含量5%，氧含量25ppm，加热段炉压260-300Pa，加热段和保温段温度850±10℃，各段速度170-180mpm；保证带钢表面完全再结晶；
9）平整机：平整机工作辊指标：工作辊毛化前Ra0.3-0.5μm ，毛化后Ra≤2.5μm，RPc值≥85 cm-1，平整机内采用平整液浓度≥3.0%，控制带钢板形和表面粗糙度，减少辊印缺陷。
2.根据权利要求1所述的一种提高冷轧带钢表面光泽度的方法，其特征在于，步骤9）中平整机采用单机架六辊UC平整机。
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