CN107326277B - 480MPa级镀锌带钢及其生产方法 - Google Patents
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Abstract
本发明480MPa级镀锌带钢,各成分质量百分比:C0.05~0.0.09,Si≤0.05,Mn0.8~1.0,P≤0.016,S≤0.008,Nb0.015~0.035,Als0.020~0.045,N≤0.007,Ti0.015~0.035,Ca0.0015~0.0030,余量为Fe;转炉、LF精炼采用低氮模式冶炼,连铸保护浇铸控制增氮;精炼结束后钙处理;钢水中酸不溶铝质量百分数≤45ppm,酸不溶铝与钙质量百分数比值为0.5‑1.5,酸不溶铝与酸溶铝质量百分数比值在0.05‑0.20之间。本发明生产成本低,产品综合力学性能优越,表面质量满足GB2518和EN10346中FB表面等级要求。
Description
技术领域
本发明属于冶金板材生产技术领域,尤其是一种480MPa级镀锌带钢及其生产方法。
背景技术
随着汽车产量的增长,人们越来越重视汽车尾气的排放。高强钢在汽车上的应用,一方面有利于实现汽车轻量化,降低汽车尾气排放量;另一方面也提高了车内人员安全保障。更为重要的是,为了保证汽车板耐腐蚀性能,镀锌汽车板的使用量也在逐年增加,尤其是抗拉强度大于等于480MPa的镀锌汽车板需求量更是与日俱增;目前生产抗拉强度大于480MPa的镀锌汽车板的方法主要是双相钢等相变强化方法,其特点是添加Cr、Mo等马氏体形成元素,利用相变提高钢的抗拉强度;该工艺方法贵重合金成本高,同时对镀锌设备快速冷却能力要求极高,而不具有普遍推广的适用性。
发明内容
本发明所要解决的技术问题是提供一种480MPa级镀锌带钢,避免使用Cr、Mo等贵重合金,有效降低生产成本,可在保证带钢抗拉强度的同时,使钢材延伸率达22%以上;本发明还提供一种480MPa级镀锌带钢的生产方法。
为解决上述技术问题,本发明所采用的技术方案为:
一种480MPa级镀锌带钢,其化学成分质量百分含量分别为:C:0.05~0.0.09%,Si:≤0.05%,Mn:0.8~1.0%,P:≤0.016%;S:≤0.008%,Nb:0.015~0.035%,Als:0.020~0.045%,N:≤0.007%,Ti:0.015~0.035%,Ca:0.0015~0.0030%,余量为Fe。
上述的480MPa级镀锌带钢,其化学成分的质量百分含量优选为:C:0.07~0.0.08%,Si:≤0.05%,Mn:0.9~1.0%,P:≤0.011%;S:≤0.008%,Nb:0.015~0.035%,Als:0.020~0.040%,N:≤0.005%,Ti:0.015~0.030%,Ca:0.0015~0.0030%,余量为Fe。
480MPa级镀锌带钢的生产方法,所述镀锌带钢的化学成分质量百分含量分别为:C:0.05~0.0.09%,Si:≤0.05%,Mn:0.8~1.0%,P:≤0.016%;S:≤0.008%,Nb:0.015~0.035%,Als:0.020~0.045%,N:≤0.007%,Ti:0.015~0.035%,Ca:0.0015~0.0030%,余量为Fe。
上述的480MPa级镀锌带钢的生产方法,包括转炉冶炼、LF精炼、连铸、热轧、镀锌前连续退火和镀锌后光整拉矫工序;其中转炉、LF精炼采用低氮模式冶炼,连铸保护浇铸控制增氮;LF精炼结束后进行钙处理,要求利用底吹氩气净吹钢水8~10min,保证夹杂物充分上浮;钙处理结束后钢水中酸不溶铝质量百分数≤45ppm,酸不溶铝与钙质量百分数比值控制在0.5-1.5之间,酸不溶铝与酸溶铝质量百分数比值控制在0.05-0.20之间。
上述的480MPa级镀锌带钢的生产方法,所述热轧工序中板坯加热温度为1220~1260℃,精轧开轧温度为1100~1150℃,终轧温度为880~940℃,卷取温度为620~680℃;热轧过程中,采用保温罩保温,终轧后采取前段冷却至710~760℃,冷却速率20~30℃/S。
上述的480MPa级镀锌带钢的生产方法,所述镀锌前连续退火工序中,均热温度为790~840℃,缓冷温度为670~710℃,快冷温度为410~465℃;镀锌后光整拉矫工序中,镀锌后光整延伸率控制范围为0.6~1.5%,拉矫机延伸率控制范围为0.1~0.4%,光整延伸率+拉矫延伸率≤1.6%。
采用上述技术方案所产生的有益效果在于:
本发明在不添加Cr、Mo等合金元素的前提下,利用Nb元素提高细晶强化作用,Mn元素提升固溶强化作用;合理降低影响镀锌表面质量和成型性能的Si元素;合理降低影响成型性能的P、S元素;合理添加Ti元素提高焊接性能;提出了以钢水中酸不溶铝与Ca、酸不溶铝与酸溶铝质量百分数比值的调整方法来提高钢水纯净度,降低产品夹杂缺陷产生几率。
本发明方法向钢中添加了适量的Nb、Mn合金,设定N、Al含量,通过控制热轧和退火工艺,在控制带钢组织的同时,控制钢中Nb和ALN析出物的形貌、分布并实现Mn元素的均匀分布,达到细晶强化、固溶强化和析出强化效果,实现产品抗拉强度达到480MPa。
本发明方法通过合理控制光整机和拉矫机延伸率,可提升带钢产品的综合力学性能,在保证产品强度的同时,使带钢延伸率达到22%以上,保证带钢具有优良的成型性能,避免使用双相钢、复相钢生产技术,降低生产控制难度;同时避免添加Cr、Mo等合金,降低生产成本;降低Si元素使用量,提高镀锌表面质量;本发明得到的镀锌带钢的抗拉强度为480~550MPa,屈服强度400~460MPa,延伸率为22~27%;可生产带钢的厚度范围为0.8~2.5mm,镀锌成品表面质量完全满足GB2518和EN10346中FB表面等级控制要求。
具体实施方式
下面结合具体实施例对本发明作进一步详细的说明。
实施例1-13:本480MPa级镀锌带钢的最终化学成分以及生产方法的工艺条件如下所述。
(1)本镀锌带钢采用转炉冶炼、LF精炼、连铸、热轧、冷轧、连续退火、镀锌工序制备而成,连铸工序后铸件的化学成分见表1:
表1:铸件化学成分
(2)热轧工序:
热轧过程中要发生第二相粒子的固溶和析出、奥氏体的形变和再结晶、铁素体转变,因此热轧是质量控制的重要环节;通过加热温度、终轧温度和卷取温度的联合设置,并且控制精轧后前段冷却,可以导致弥散细小的二相粒子析出,实现晶粒细化;各实施例热轧工序具体的工艺参数见表2:
表2:热轧工艺参数
(3)镀锌前连续退火与镀锌后光整拉矫工艺
镀锌前连续退火工序通过设计合理的均热、缓冷、快冷温度以及冷速,获得镀锌带钢所必需的显微组织;均热温度保证形成晶粒大小和形态均匀,控制缓冷温度、快冷温度和冷却速率促进均热形成的铁素体晶粒中C、N元素向奥氏体中扩散,利用扩散相变机理降低新生铁素体杂质含量,并保证晶粒较均匀细小,不过分长大。
表3 :镀锌前连续退火和光整拉矫工艺
(4)各实施例所得产品力学性能见表4.
表4:产品力学性能
由表4可知,实施例1-13所得产品完全能满足480MPa级镀锌带钢的性能要求。
Claims (5)
1.一种480MPa级镀锌带钢,其特征在于:带钢化学成分质量百分含量分别为:C:0.05~0.0.09%,Si:≤0.05%,Mn:0.8~1.0%,P:≤0.016%;S:≤0.008%,Nb:0.015~0.035%,Als:0.020~0.045%,N:≤0.007%,Ti:0.015~0.035%,Ca:0.0015~0.0030%,余量为Fe;所述带钢的厚度范围为0.8~2.5mm;
所述镀锌带钢由如下方法制成:包括转炉冶炼、LF精炼、连铸、热轧、镀锌前连续退火和镀锌后光整拉矫工序;其中转炉冶炼、LF精炼采用低氮模式冶炼,连铸保护浇铸控制增氮;LF精炼结束后进行钙处理,要求利用底吹氩气净吹钢水8~10min,保证夹杂物充分上浮;钙处理结束后钢水中酸不溶铝质量百分数≤45ppm,酸不溶铝与钙质量百分数比值为0.5-1.5,酸不溶铝与酸溶铝质量百分数比值控制在0.05-0.20之间;热轧工序中板坯加热温度为1220~1260℃,精轧开轧温度为1100~1150℃,终轧温度为880~940℃,卷取温度为620~680℃;热轧过程中,采用保温罩保温,终轧后采取前段冷却至710~760℃,冷却速率20~30℃/S;所述镀锌前连续退火工序中,均热温度为790~840℃,缓冷温度为670~710℃,快冷温度为410~465℃;镀锌后光整拉矫工序中,镀锌后光整延伸率控制范围为0.6~1.5%,拉矫机延伸率控制范围为0.1~0.4%,光整延伸率+拉矫延伸率≤1.6%。
2.如权利要求1所述的480MPa级镀锌带钢,其特征在于:带钢化学成分的质量百分含量优选为:C:0.07~0.0.08%,Si:≤0.05%,Mn:0.9~1.0%,P:≤0.011%;S:≤0.008%,Nb:0.015~0.035%,Als:0.020~0.040%,N:≤0.005%,Ti:0.015~0.030%,Ca:0.0015~0.0030%,余量为Fe。
3.480MPa级镀锌带钢的生产方法,其特征在于:所述镀锌带钢的化学成分质量百分含量分别为:C:0.05~0.0.09%,Si:≤0.05%,Mn:0.8~1.0%,P:≤0.016%;S:≤0.008%,Nb:0.015~0.035%,Als:0.020~0.045%,N:≤0.007%,Ti:0.015~0.035%,Ca:0.0015~0.0030%,余量为Fe;所述生产方法包括转炉冶炼、LF精炼、连铸、热轧、镀锌前连续退火和镀锌后光整拉矫工序;其中转炉、LF精炼采用低氮模式冶炼,连铸保护浇铸控制增氮;LF精炼结束后进行钙处理,要求利用底吹氩气净吹钢水8~10min,保证夹杂物充分上浮;钙处理结束后钢水中酸不溶铝质量百分数≤45ppm,酸不溶铝与钙质量百分数比值为0.5-1.5,酸不溶铝与酸溶铝质量百分数比值控制在0.05-0.20之间。
4.如权利要求3所述的480MPa级镀锌带钢的生产方法,其特征在于:所述热轧工序中板坯加热温度为1220~1260℃,精轧开轧温度为1100~1150℃,终轧温度为880~940℃,卷取温度为620~680℃;热轧过程中,采用保温罩保温,终轧后采取前段冷却至710~760℃,冷却速率20~30℃/S。
5.如权利要求4所述的480MPa级镀锌带钢的生产方法,其特征在于:所述镀锌前连续退火工序中,均热温度为790~840℃,缓冷温度为670~710℃,快冷温度为410~465℃;镀锌后光整拉矫工序中,镀锌后光整延伸率控制范围为0.6~1.5%,拉矫机延伸率控制范围为0.1~0.4%,光整延伸率+拉矫延伸率≤1.6%。
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