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CN112195429B - 一种无锌花900g/m2双面超厚锌层镀锌板的生产方法 - Google Patents

一种无锌花900g/m2双面超厚锌层镀锌板的生产方法 Download PDF

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CN112195429B
CN112195429B CN202011026550.2A CN202011026550A CN112195429B CN 112195429 B CN112195429 B CN 112195429B CN 202011026550 A CN202011026550 A CN 202011026550A CN 112195429 B CN112195429 B CN 112195429B
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air knife
temperature
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华震宇
陈相东
马占军
贾海超
吴一浩
高岩
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Chengde Chengde Vanadium Titanium Cold Rolled Sheet Co ltd
HBIS Co Ltd Chengde Branch
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Abstract

本发明属于冶金技术领域，具体涉及一种无锌花900g/m2双面超厚锌层镀锌板的生产方法。该生产方法至少包括以下工序：热轧卷平整—酸洗—平整—卷取—开卷—焊接—退火—镀锌—光整—钝化—卷取。本发明通过两次平整和一次光整工序，并通过对平整轧制力，工作辊粗糙度等参数进行控制，可制得900g/m2超厚无花热镀锌层。镀层致密且均匀，镀层与钢基体结合力强，耐久性好，电化学电位较钢铁材料电位更低，具有优良的电化学保护性能，可有效满足光伏支架用钢，地下管廊用钢等技术需求。

Description

一种无锌花900g/m2双面超厚锌层镀锌板的生产方法
技术领域
本发明属于冶金技术领域，尤其涉及一种无锌花900g/m2双面超厚锌层镀锌板的生产方法。
背景技术
随着国家大力发展建设，钢材应用领域越来越广，市场对钢材尤其是耐腐蚀性钢材的需求量越来越大。在表面电镀金属保护层尤其是镀锌法是钢材防腐的主流方法，镀锌层与钢基体通过合金进行结合，镀层持久可靠，即使产品在恶劣、潮湿的环境下也有较强的耐腐蚀性。
现有技术中制备锌层的最优方法当属连续热镀锌法，与其他方法相比，连续热镀锌法可有效节约资源减少、环境污染，是较为理想的涂镀方式。众所周知，锌层越厚镀锌板抗腐蚀能力越强，故市场对于超厚锌层钢板的需求量越来越大，而采用传统的连续热镀锌工艺制备超厚锌层存在厚度不均匀、表面质量差等问题，越来越无法满足市场的需求。
发明内容
针对现有技术中连续热镀锌法制备超厚锌层存在的镀层不均匀，表面质量差等技术问题，本发明提供一种无锌花900g/m2双面超厚锌层镀锌板的生产方法。
为达到上述发明目的，本发明实施例采用了如下的技术方案：
一种无锌花900g/m2双面超厚锌层镀锌板的生产方法，所述生产方法至少包括以下工序：热轧原料平整—酸洗—酸洗后平整—卷取—开卷—焊接—退火—镀锌—光整—钝化—卷取。
其中热轧原料平整工序轧制力控制范围：3000～4000KN；酸洗后平整工序工作辊为毛化辊，辊面粗糙度Ra：4～6μm，轧制力控制范围：2500～3500KN。
相对于现有技术，本申请的技术方案采用两次平整一次光整工序，并通过对轧制力及工作辊的粗糙度进行控制，制得的超厚无花热镀锌层镀锌板锌层双面之和可达900g/m2，厚度均匀，表面质量高，可有效满足光伏支架用钢，地下管廊用钢等技术需求。
优选地，酸洗工序采用连续酸洗工艺，具体包括：破鳞—三级酸洗—五级漂洗，其中三级酸洗采用紊流式，五级漂洗采用逆流喷淋式。
优选地，酸洗后平整采用四辊湿平整，可实现在线快速换辊，有效减少不平整量，提高平整效率。
优选地，光整工序工作辊为毛化辊，要求辊面粗糙度Ra：3.0～4.0μm，毛化点密度≥70点/mm2。
优选的粗糙度可有效降低镀锌板表面的反射率，可有效消除镀锌后表面的云纹，锌流纹等缺陷，提升了镀锌板的表面质量。
优选地，退火工序在退火炉中进行，炉内氮气量通入为200～240m3/h，炉内氢气控制为50～60m3/h，炉内氧含量控制为≤50ppm、露点温度≤-40℃。
优选地，退火工序逐区控制温度，其中明火段板温650±10℃，辐射管段板温660±10℃，均热段600±10℃。
优选地，所述退火工序冷却段采用3根平行加热管加热，其中中间加热管温度为440±5℃，两侧加热管温度为500±5℃。
优选的温度区间既保证了带钢入锌锅反应所需的激活能，又避免了温度过高造成的能源浪费和事故的发生，提高了生产效率的同时降低了生产成本。
以上优选的冷却制度可有效减轻带钢出锌锅后边部冷却过快造成边厚、锌层不均缺陷。
优选地，镀锌工序中包括锌液浸泡与气刀吹气工艺，其中锌液浸泡工艺在锌锅中进行，锌锅中锌液温度为450～460℃，锌液中Al的质量百分含量0.16～0.18％，Fe的质量百分含量≤0.02％。
优选地，气刀吹气工艺使用POSJET气刀。
优选地，所述POSJET气刀的基本参数为：气刀距带钢距离40～50mm，气刀压力40～45mbar，气刀距液面高度80～90mm,气刀角度-1～0°，气刀刀唇间隙中间1.4～1.45mm，两侧分别以0.03mm递增，最外侧1.6～1.65mm。
优选的POSJET气刀介质为空气，可极大降低生产成本。优选的气刀距带钢距离和气刀压力可以防止空气氧化锌层表面。优选的气刀角度、刀唇间隙、气刀高度和优选的锌液成分相互配合，可以提高镀锌效率和表面质量，制备出满足900g/m2的锌层。
现对于现有技术，本发明所生产的无锌花900g/m2双面超厚锌层产品性能优异，锌层粘附性好，表面质量高，耐腐蚀性极好，产品应用广泛，可代替热浸镀锌板，减少环境污染，降低生产成本。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合具体实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
实施例1
本实施例提供了一种无锌花900g/m2双面超厚锌层镀锌板的生产方法，基板厚度1.8mm的S450GD原料经过热轧原料平整—酸洗—酸洗后平整—卷取—开卷—焊接—退火—镀锌—光整—钝化—卷取工艺后，最终制得900g/m2无锌花超厚锌层产品。
其中：热轧原料平整工序平整轧制力为3000KN；
酸洗后平整工序，工作辊表面处理为毛化加工，要求辊面粗糙度Ra：4.0μm，平整轧制力2500KN；
光整工序，工作辊表面处理为毛化加工，辊面粗糙度Ra：3.0μm，毛化点密度70点/mm2，轧制力3500KN；
退火炉工序在退火炉中进行，板温逐区控制：明火段板温640℃，辐射管段板温650℃，均热段590℃，冷却段采用3根平行加热管进行加热，中间加热管温度435℃，两侧加热管温度495℃；炉内氮气量通入为200m3/h，炉内氢气控制为50m3/h，炉内氧含量为30ppm，炉内露点温度-40℃；
镀锌工序包括锌液浸泡与气刀吹气工艺，锌液温度为450℃，锌液中Al的质量百分含量0.16％，Fe的质量百分含量为0.02％。气刀吹气工艺采用POSJET 气刀，基本参数为：气刀距带钢距离为40mm，气刀压力为40mbar，气刀距液面高度为80mm,气刀角度为-1°，气刀刀唇间隙中间为1.40mm，两侧分别以 0.03mm递增，最外侧为1.60mm。
实施例2
本实施例提供了一种无锌花900g/m2双面超厚锌层镀锌板的生产方法，基板原料经过热轧原料平整—酸洗—酸洗后平整—卷取—开卷—焊接—退火—镀锌—光整—钝化—卷取工艺后，最终制得900g/m2双面无锌花超厚锌层产品：
热轧原料平整工序，平整轧制力3500KN；
酸洗后平整工序，工作辊表面处理为毛化加工，要求辊面粗糙度Ra：5.0μm，平整轧制力3000KN；
光整工序，工作辊表面处理为毛化加工，要求辊面粗糙度Ra：3.5μm，毛化点密度80点/mm2，轧制力4000KN；
退火工序在退火炉中进行，板温逐区控制：明火段板温650℃，辐射管段板温660℃，均热段600℃，冷却段采用3根平行加热管进行加热，中间管温 440℃，两侧管温500℃；炉内氮气量通入为220m3/h，炉内氢气控制为55m3/h，炉内氧含量为40ppm，炉内露点温度-45℃；
镀锌工序包括锌液浸泡与气刀吹气工艺，锌液温度为455℃，锌液中Al 的质量百分含量0.17％，Fe的质量百分含量为0.018％。气刀吹气工艺采用 POSJET气刀，基本参数为：气刀距带钢距离为45mm，气刀压力为42mbar，气刀距液面高度为85mm,气刀角度为-0.05°，气刀刀唇间隙中间为1.43mm，两侧分别以0.03mm递增，最外侧为1.62mm。
实施例3
本实施例提供了一种无锌花900g/m2双面超厚锌层镀锌板的生产方法，基板厚度5.0mm的S450GD原料经过热轧原料平整—酸洗—酸洗后平整—卷取—开卷—焊接—退火—镀锌—光整—钝化—卷取工艺后，最终制得900g/m2双面无锌花超厚锌层产品。
热轧原料平整工序，平整轧制力4000KN；
酸洗后平整工序，工作辊表面处理为毛化加工，要求辊面粗糙度Ra：6.0μm，平整轧制力3500KN；
光整工序，工作辊表面处理为毛化加工，要求辊面粗糙度Ra：4.0μm，毛化点密度90点/mm2，轧制力4500KN；
退火工序在退火炉中进行，板温逐区控制：明火段板温660℃，辐射管段板温670℃，均热段610℃，冷却段采用3根平行加热管进行加热，中间管温 445℃，两侧管温505℃。炉内氮气量通入为240m3/h，炉内氢气控制为60m3/h，炉内氧含量为50ppm，炉内露点温度-40℃；
镀锌工序包括锌液浸泡与气刀吹气工艺，锌液温度为460℃，锌液中Al 的质量百分含量0.18％，Fe的质量百分含量为0.016％。气刀吹气工艺采用 POSJET气刀，基本参数为：气刀距带钢距离为50mm，气刀压力为45mbar，气刀距液面高度为90mm,气刀角度为0°，气刀刀唇间隙中间为1.45mm，两侧分别以0.05mm递增，最外侧为1.65mm。
效果例
各实施例所达到的镀锌效果如表1所示。
表1实施效果
Figure BDA0002702270660000061
上述实施例证明，采用本发明技术方案可稳定生产无锌花900g/m2双面超厚锌层产品，并且超厚锌层具有厚度均匀、表面质量好、性能优良、极耐腐蚀的特点。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换或改进等，均应包含在本发明的保护范围之内。

Claims (3)

1.一种无锌花900g/m2双面超厚锌层镀锌板的生产方法，其特征在于，包括以下工序：热轧原料平整—酸洗—酸洗后平整—卷取—开卷—焊接—退火—镀锌—光整—钝化—卷取；
所述热轧原料平整工序轧制力控制范围：3000~4000kN；
所述酸洗后平整工序工作辊为毛化辊，辊面粗糙度Ra：4~6μm，轧制力控制范围：2500~3500kN；
所述光整工序工作辊为毛化辊，辊面粗糙度Ra：3.0~4.0μm，毛化点密度≥70点/mm2；
所述退火工序逐段控制温度：明火段板温650±10℃，辐射管段板温660±10℃，均热段600±10℃；所述退火工序冷却段采用3根平行加热管进行加热，其中中间加热管温度为440±5℃，两侧加热管温度为500±5℃；
所述镀锌工序包括锌液浸泡与气刀吹气工艺；
所述锌液浸泡在锌锅中进行；锌液温度为450~460℃，锌液中Fe的质量百分含量≤0.02%，Al的质量百分含量0.16%~0.18%；
所述气刀吹气工艺采用POSJET气刀；所述POSJET气刀的基本参数为：气刀与带钢距离40~50mm，气刀压力40~45mbar，气刀与液面距离80~90mm，气刀角度-1~0°，气刀刀唇中间间隙1.4~1.45mm，刀唇间隙距离以0.03mm向外递增，最外侧1.6~1.65mm。
2.根据权利要求1所述的无锌花900g/m2双面超厚锌层镀锌板的生产方法，酸洗工序采用连续酸洗工艺，具体包括：破鳞—三级酸洗—五级漂洗，其中三级酸洗采用紊流式，五级漂洗采用逆流喷淋式。
3.根据权利要求1所述的无锌花900g/m2双面超厚锌层镀锌板的生产方法，其特征在于，所述退火工序在退火炉中进行，炉内氮气通入量200~240m3/h，炉内氢气控制50~60m3/h，炉内氧含量≤50ppm，露点温度≤-40℃。
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