CN113528934A - 一种340MPa级轿车后备胎底板用热镀锌高强IF钢及其制备方法 - Google Patents
一种340MPa级轿车后备胎底板用热镀锌高强IF钢及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种340MPa级轿车后备胎底板用热镀锌高强IF钢,包括如下质量百分比的化学元素:C≤0.0025%、S i:0.05%~0.10%、Mn:0.45%~0.70%、P:0.030%~0.048%、T i:0.050%~0.065%、Al s:0.030%~0.055%、B:0.0004%~0.0014%、S≤0.010%、O≤0.0030%、N≤0.0040%,余量为Fe和不可避免的杂质。还公布了其制备方法。本发明通过添加T i合金元素来消除间隙原子并实现析出强化,再添加Mn、P、Si元素实现固溶强化,通满足了轿车前翼子板所需求优良的冲压成型和耐腐蚀性。
Description
技术领域
本发明涉及高强度汽车用钢技术领域,尤其涉及一种340MPa级轿车后备胎底板用热镀锌高强IF钢。该热镀锌高强IF钢通过适当P、Si和Mn元素进行固溶强化,添加Ti合金元素消除间隙原子并实现析出强化,添加B元素抑制P在晶界处偏析。此发明材料应用于轿车后备胎底板使用。
背景技术
随着现代工业技术的不断发展,节约能源和保护环境已成为全社会关注的重大课题,汽车工业也不例外。因此,在现代汽车的结构性能中,减重降耗,减少环境污染和提高安全性成为研究的热点。
由于热镀锌铁合金产品具有较好的焊接性能、涂装性能以及耐蚀性能,因此其被广泛地应用于高档汽车的外板,现有传统的较难冲件基本上都采用普通IF钢,但汽车减重步伐的日益加快,BH钢逐渐代替普通IF钢,但BH钢不能够长时间地存放,需要在较短时间内使用完毕,BH钢也无法用于制造一些比较难成形的零件。BH钢相比较,高强IF钢在普通IF软钢基础上通过添加强化元素而得到,因此其具备无间隙原子钢的特性,即高强IF钢具有良好的冲压成形的特点,并且不存在时效问题,因此,高强IF钢被广泛地应用于制造汽车外板领域。
公开号为CN101348884A的专利申请提供了一种440MPa含铌高强IF钢及其制备方法,其化学成分为:C:0.005%~0.007%、Si:0.02%~0.03%、Mn:1.2%~2.1%、P<0.08%、S<0.006%、N<0.003%、Nb:0.05%~0.11%、B:0.0005%~0.002%、Cr:0.2%~0.5%、Ti:0.005%~0.01%、AI:0.01%~0.04%、其余为Fe和不可避免的杂质其化学成分,其中Nb含量高达0.05%~0.11%,原料成本较高。
公开号为CN103710617A的专利申请提供了一种340MPa级热镀锌铁合金高强IF钢,其化学成分中Nb含量为0.01~0.025%、Ti含量为0.005~0.015%,同样添加Nb元素增加了制造成本。
上述专利所涉及高强IF钢制造过程中都含有价格较贵的Nb元素,为了适应现代钢铁材料低成本优良的冲压成型性、环保与耐腐蚀性,本发明通过不添加Nb元素来降低生产成本。
本发明通过添加Ti合金元素来消除间隙原子并实现析出强化,再添加Mn、P、Si元素实现固溶强化,通过添加适量的B元素抑制P在晶界处偏析,再加上热镀锌合金化工艺的特殊性。满足了轿车前翼子板所需求优良的冲压成型和耐腐蚀性。符合现代钢铁特殊产品研发设计理念。
发明内容
本发明的目的是提供一种340MPa级轿车后备胎底板用热镀锌高强IF钢及其制备方法,在IF钢基体上适当添加P、Si和Mn元素进行固溶强化以保证强度,添加Ti合金元素消除间隙原子并实现析出强化,添加适量的B元素抑制P在晶界处偏析,保证较高断后延伸率、较低屈强比,同时提高抗拉强度。
为解决上述技术问题,本发明采用如下技术方案:
本发明一种340MPa级轿车后备胎底板用热镀锌高强IF钢,包括如下质量百分比的化学元素:C≤0.0025%、Si:0.05%~0.10%、Mn:0.45%~0.70%、P:0.030%~0.048%、Ti:0.050%~0.065%、Als:0.030%~0.055%、B:0.0004%~0.0014%、S≤0.010%、O≤0.0030%、N≤0.0040%,余量为Fe和不可避免的杂质。
一种340MPa级轿车后备胎底板用热镀锌高强IF钢的制备方法,包括:炼钢工艺、热轧工艺、冷轧、镀锌工艺、退火工艺。
进一步的,板坯加热温度为1170~1210℃,加热时间为180~240min,精轧终轧温度900~930℃,卷取温度为605~635℃;退火工艺参数为:加热和均热段出口温度820~830℃,缓冷段出口温度670~690℃,快冷段温度460~480℃,入锌锅温度460~470℃,冷却塔塔顶带钢温度240~250℃。
进一步的,光整机延伸率0.6~0.8%,拉矫机延伸率<0.05%。
与现有技术相比,本发明的有益技术效果:
目前市场汽车外板用钢一般采用Nb-Ti成分体系,其中Nb元素的添加虽然细化晶粒,增加产品强度,但产品成本往往比采用Ti合金元素高很多。而本发明不同于市场上其他产品,采用Ti合金元素消除间隙原子,添加P、Si和Mn、B元素设计思路,通过控制热轧、酸轧和退火工艺,实现成品性能的低屈强比、高强度及断后伸长率,降低产品生产成本。
结合生产设备能力特点,经过冶炼、2250mm热轧轧机、酸洗连轧机组和连续退火工艺,实现成品屈服强度180~240MPa,抗拉强度340~400MPa,断后伸长率≥34%(拉伸检验:L0=80mm,b0=20mm),n值≥0.18,r值≥1.7,保证较低的屈强比和良好的冲压性能。
附图说明
下面结合附图说明对本发明作进一步说明。
图1和图2均为本发明340MPa级轿车后备胎底板用热镀锌高强IF钢的成品金相组织图;
图3和图4为冲压后实物照片。
具体实施方式
一种340MPa级轿车后备胎底板用热镀锌高强IF钢的制备方法,包括:
1.冶炼工艺
1.1KR脱硫:采用KR铁水脱硫技术,要求深脱硫后终点硫含量在0.002%以内,KR脱硫通过机械搅拌法脱硫,向铁水加入脱硫剂,使脱硫剂和铁水中的硫在不断的搅拌中发生脱硫反应脱去铁水中的硫含量,脱硫完成后将脱硫渣彻底扒除干净,防止高硫渣兑入转炉中导致回硫。入炉铁水温度稳定性控制,保证铁水温度在1300℃以上,利于稳定转炉冶炼过程控制,提高转炉终点温度命中率。
1.2转炉冶炼:
转炉铁水根据Si含量加入废钢,保证冶炼过程热量平衡,冶炼钢种为高P钢种,白灰加入量较少;根据转炉冶炼过程温度控制,冶炼过程通过白云石、铁皮球、压块等渣料及含铁料加入稳定冶炼过程温度,满足炉渣MgO含量,避免炉衬侵蚀严重。转炉出钢温度控制应大于1670℃。防止钢液过氧化,转炉出钢过程加入锰铁进行合金化,出钢完毕加入白灰和改质剂进行顶渣改质。
1.3RH真空处理:RH精炼炉根据钢水就位成分及温度进行脱碳处理,RH脱碳是超低碳钢生产中最重要的脱碳环节,保证真空度在2mbar以下脱碳10min,真空处理开始加入磷铁调整钢水中的磷含量,脱碳结束后,根据定氧情况加入脱氧剂和成分铝,循环3~4分钟后加入钛铁、铌铁、金属锰、微碳硅铁、磷铁等合金调整成分。调成分完毕后确保真空脱气循环5~10min,保证钢水温度成分均匀化,同时有利于钢水夹杂物的上浮,提高钢水的洁净度。
1.4连铸:连铸恒拉速,连铸保护浇注,防止钢液的二次氧化,避免钢水二次氧化钢质。采用恒拉速,根据断面不同控制拉速,控制浇注合适的过热度,浇注过程中过热度控制在25-45℃之间,避免钢水浇铸过程结冷钢,有利于夹杂物的上浮,实现了多炉浇注。
2热轧工艺
采用步进式加热炉加热铸坯(加热工艺见表1),粗轧采用双机架R1和R2往返式轧制,粗轧模式为3+3,精轧采用F1~F7连轧工艺,精轧温度915±15℃,保证奥氏体单相区轧制,卷取温度620±15℃,保证碳氮化物正常析出,提高深冲性能,具体热轧工艺见表2。
表1铸坯加热制度
表2轧制工艺
3退火工艺
退火使用立式连续退火炉,炉内采用还原性气氛和氮氢混合保护气氛冷却。加热段和均热段温度目标825℃,保证晶粒完全再结晶,加热炉各段出口温度控制情况见表3,平整机延伸率不同厚度控制情况见表4。
表3退火工艺
表4平整机延伸率
4实施例分析
4.1炼钢成分
根据以上的炼钢工艺要求,实际板坯化学成分(质量百分比)如下表5所示。
表5实例化学成分wt.%
4.2热轧性能
按照以上设计化学成分和热轧工艺,热轧板室温拉伸性能见表6,试验方法参照GB/T 228.1和GB/T 229。
表6热轧拉伸性能
4.3成品性能
在上述热轧性能的基础上进行冷轧和退火,成品的室温拉伸力学性能见表7,金相组织为等轴铁素体,在晶界处存在少量的(C、N)T i析出物,晶粒度10.0级,组织形貌见图1。
表7成品拉伸性能
4.4冲压后实际效果
冲压成型性满足用户要求,冲压后实物照片如图2所示。
综上所述,本产品通过客户冲压检验,各项性能满足需求
以上所述的实施例仅是对本发明的优选方式进行描述,并非对本发明的范围进行限定,在不脱离本发明设计精神的前提下,本领域普通技术人员对本发明的技术方案做出的各种变形和改进,均应落入本发明权利要求书确定的保护范围内。
Claims (4)
1.一种340MPa级轿车后备胎底板用热镀锌高强IF钢,其特征在于:包括如下质量百分比的化学元素:C≤0.0025%、Si:0.05%~0.10%、Mn:0.45%~0.70%、P:0.030%~0.048%、Ti:0.050%~0.065%、Als:0.030%~0.055%、B:0.0004%~0.0014%、S≤0.010%、O≤0.0030%、N≤0.0040%,余量为Fe和不可避免的杂质。
2.根据权利要求1所述的340MPa级轿车后备胎底板用热镀锌高强IF钢的制备方法,其特征在于:包括:炼钢工艺、热轧工艺、冷轧、镀锌工艺、退火工艺。
3.根据权利要求2所述的制备方法,其特征在于:板坯加热温度为1170~1210℃,加热时间为180~240min,精轧终轧温度900~930℃,卷取温度为605~635℃;退火工艺参数为:加热和均热段出口温度820~830℃,缓冷段出口温度670~690℃,快冷段温度460~480℃,入锌锅温度460~470℃,冷却塔塔顶带钢温度240~250℃。
4.根据权利要求2或3所述的的制备方法,其特征在于:光整机延伸率0.6~0.8%,拉矫机延伸率<0.05%。
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