CN108728746A - 一种新型镀锌钢板及其加工方法 - Google Patents
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Abstract
本发明涉及钢材加工技术领域,公开了一种新型镀锌钢板,包括:钢板、镀锌层和化成处理膜,所述镀锌层覆盖在钢板表面,化成处理膜覆盖在镀锌层表面;所述钢板按重量包括:C 0.03~0.044%、Si 0.019~0.034%、Mn 0.13~0.18%、P 0.11~0.18%、S 0.03~0.05%,其余为Fe;每一面的镀锌层的附着量为40g/m2;所述化成处理膜包括:钝化剂68%、防锈剂20%和无机酸12%。本发明的新型镀锌钢板由于采用了上述特有的成分含量,屈服强度和抗拉强度相对于现有的镀锌钢板均有所提升,而且化成处理膜中含有防锈剂,使得盐雾测试值达到120H以上,耐腐蚀性更强。
Description
技术领域
本发明涉及钢材加工技术领域,特别涉及一种新型镀锌钢板及其加工方法。
背景技术
镀锌钢板是为防止钢板表面遭受腐蚀延长其使用寿命,在钢板表面涂上一层金属锌,一般广泛用于建筑、家电、车船、容器制造业、机械及电子业等。
目前符合中华人民共和国国家GB标准2518-2008的镀锌钢板的性能盐雾测试在72H,国内大多用于电子行业中的镀锌钢板盐雾测试在76H左右。但是随着电子行业的高速发展,目前符合国标的镀锌钢板的盐雾测试性能不够,而且屈服强度和抗拉强度不够、成型性较差,不满足电子行业的需求。
发明内容
本发明提出一种新型镀锌钢板及其加工方法,解决现有技术的镀锌钢板盐雾测试性能不够,而且屈服强度和抗拉强度不够、成型性较差的问题。
本发明的一种新型镀锌钢板,包括:钢板、镀锌层和化成处理膜,所述镀锌层覆盖在钢板表面,化成处理膜覆盖在镀锌层表面;所述钢板按重量包括:C 0.03~0.044%、Si0.019~0.034%、Mn 0.13~0.18%、P 0.11~0.18%、S 0.03~0.05%,其余为Fe;每一面的镀锌层为40g/m2;所述化成处理膜包括:钝化剂68%、防锈剂20%和无机酸12%。
其中,所述钢板按重量包括:C 0.043%、Si 0.028%、Mn 0.15%、P 0.16%、S0.04%,其余为Fe。
其中,所述化成处理膜的附着量为40~70mg/m2。
本发明还提供了一种上述的新型镀锌钢板的加工方法,包括:
将冷轧钢板清洗并退火,退火温度为620~800℃;
退火后的钢板浸入镀锌槽进行热镀锌,以在钢板表面形成镀锌层;
冷却热镀锌后的钢板,并对钢板进行张力校平;
校平后的钢板进入化成池进行表面化成处理,以形成化成处理膜。
其中,所述镀锌槽的熔融锌液中锌含量不小于99%。
本发明的新型镀锌钢板由于采用了上述特有的成分含量,屈服强度和抗拉强度相对于现有的镀锌钢板均有所提升,因此在后续加工的过程中镀锌钢板成型性相对较好,而且化成处理膜中含有防锈剂,使得盐雾测试值达到120H以上,耐腐蚀性更强。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动性的前提下,还可以根据这些附图获得其他的附图。
图1为本发明的一种新型镀锌钢板结构示意图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
本实施例的新型镀锌钢板如图1所示,包括:钢板1、镀锌层2和化成处理膜3,镀锌层2覆盖在钢板1表面,化成处理膜3覆盖在镀锌层2表面。钢板1按重量包括:C 0.03~0.044%、Si 0.019~0.034%、Mn 0.13~0.18%、P 0.11~0.18%、S 0.03~0.05%,其余为Fe;每一面的镀锌层2的附着量为40g/m2。化成处理膜3包括:钝化剂68%、防锈剂20%和无机酸(以三价铬盐为主)12%。
本实施例的新型镀锌钢板含碳量高,含锰量相对较高,镀锌层较薄(附着量为40g/m2),使得该镀锌钢板屈服强度和抗拉强度更好,按上述成分制成的镀锌钢板FW500系列进行力学性能测试,屈服强度从传统镀锌钢板的210~240MPa提升到310~380MPa,抗拉强度从传统镀锌钢板的320~350MPa提升到370~400MPa,因此在后续加工的过程中镀锌钢板成型性相对较好。而且在延伸率性能上也有提升,本实施例的镀锌钢板的延伸率达到29~35%。由于镀锌层较薄,因此化成处理膜中含有防锈剂,使得盐雾测试值达到120H以上,耐腐蚀性更强。总之,本实施例的镀锌钢板,既轻薄又耐腐蚀,而且屈服强度和抗拉强度更好,适合电子行业发展的需求。
优选地,钢板1按重量包括:C 0.043%、Si 0.028%、Mn 0.15%、P 0.16%、S0.04%,其余为Fe。
本实施例中,该化成处理膜3的附着量为40~70mg/m2,附着量太少的话,盐雾测试值达不到120H,太多的话在后续冲压加工的时候化成处理膜3易脱落,而且太多的话化成处理膜3厚度较厚,导电性差。
本发明还提供了一种上述新型镀锌钢板(FW500)的加工方法,包括如下步骤:
将冷轧钢板清洗并退火,退火温度为620~800℃,该退火温度有利于提升屈服强度和抗拉强度。
退火后的钢板浸入镀锌槽进行热镀锌,以在钢板表面形成镀锌层。
冷却热镀锌后的钢板,并对钢板进行张力校平。
校平后的钢板进入化成池进行表面化成处理,以形成化成处理膜。
镀锌槽的熔融锌液中锌含量不小于99%,锌含量高以保证镀锌层不同区域密度一致。
以上所述仅为本发明的较佳实施例,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、改进等,均应包含在本发明的保护范围之内。
Claims (5)
1.一种新型镀锌钢板,其特征在于,包括:钢板、镀锌层和化成处理膜,所述镀锌层覆盖在钢板表面,化成处理膜覆盖在镀锌层表面;所述钢板按重量包括:C 0.03~0.044%、Si0.019~0.034%、Mn 0.13~0.18%、P 0.11~0.18%、S0.03~0.05%,其余为Fe;每一面的镀锌层的附着量为40g/m2;所述化成处理膜包括:钝化剂68%、防锈剂20%和无机酸12%。
2.如权利要求1所述的镀锌钢板,其特征在于,所述钢板按重量包括:C0.043%、Si0.028%、Mn 0.15%、P 0.16%、S 0.04%,其余为Fe。
3.如权利要求1所述的镀锌钢板,其特征在于,所述化成处理膜的附着量为40~70mg/m2。
4.一种如权利要求1~3中任一项所述的新型镀锌钢板的加工方法,其特征在于,包括:
将冷轧钢板清洗并退火,退火温度为620~800℃;
退火后的钢板浸入镀锌槽进行热镀锌,以在钢板表面形成镀锌层;
冷却热镀锌后的钢板,并对钢板进行张力校平;
校平后的钢板进入化成池进行表面化成处理,以形成化成处理膜。
5.如权利要求4所述的镀锌钢板的加工方法,其特征在于,所述镀锌槽的熔融锌液中锌含量不小于99%。
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CN113227437A (zh) * | 2018-12-19 | 2021-08-06 | Posco公司 | 加工性和耐蚀性优异的异种镀覆钢板及其制造方法 |
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