CN113667892B - 一种经济型低温连续退火冷轧高强钢带及其生产方法 - Google Patents
一种经济型低温连续退火冷轧高强钢带及其生产方法 Download PDFInfo
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Abstract
本发明公开了一种经济型低温连续退火冷轧高强钢带及其生产方法,钢带化学成分组成及质量百分含量为:C:0.030~0.060%,Si≤0.050%,Mn:0.30~0.55%,P:0.015~0.025%,S≤0.020%,Als:0.020~0.060%,其余为Fe和不可避免的杂质;制造方法包括炼钢、连铸、热连轧、酸连轧、连续退火工序;本发明采用不添加贵合金的成分设计体系,通过较低的热轧卷取温度、较大的冷轧压下率、较低的退火均热温度等控制,使钢带具有较细的晶粒组织并保留足够的位错,可满足浅冲压、折弯成型加工要求,具有生产成本低、效率高的特点,广泛应用于交通、建筑等领域。
Description
技术领域
本发明涉及冶金技术领域,具体涉及一种经济型低温连续退火冷轧高强钢带及其生产方法。
背景技术
随着国家工业的迅速发展,交通与建筑等领域用钢量需求日益增加,连续退火冷轧高强钢带凭借均匀的力学性能、较高的尺寸精度、以及优良的表面质量与板型质量,其应用越来越广泛。但随着竞争压力不断加大,在确保产品质量前提前如何降低生产成本是钢铁企业面临的挑战,尤其是针对不同的应用领域,不同的加工特点,更好的结合用户需求,低成本地开发出满足用户使用性能等相关要求的产品。
CN111996457A公开了低温连续退火生产冷轧钢板的方法,其化学成分以质量百分比计为:C:0.001~0.005%、Si:≤0.03%、Mn:0.10~0.20%、P:0.005~0.020%、S:0.007~0.018%、Al:0.010~0.070%、Ti:0.055~0.085%,余量为Fe和不可避免的杂质;其生产工艺为:连铸、热轧、冷轧、连续退火,其中连续退火采用单台阶退火加热制度,连续退火的温度控制在795~810℃。相比本发明,CN111996457A采用超低碳加钛的成分体系,炼钢成本高且控制难度大,退火温度在795℃以上,属于完全再结晶退火。
CN102653839A公开了一种低温连续退火无间隙原子冷轧钢板,其特征在于所述冷轧钢板在连续退火时的温度是710~740℃;所述冷轧钢板含有的成分和质量百分比含量为:C:0.0005~0.0025%,Si≤0.03%,Mn:0.05~0.2%,P≤0.015%,S≤0.01%,O≤0.0025%,N≤0.0025%,Al:0.015~0.050%,Ti:0.03~0.07%,其余为Fe和不可避免的夹杂元素。相比本发明,CN102653839A采用超低碳加钛的成分体系,炼钢成本高且控制难度大,同时退火温度在700℃以上。
CN108823499B分开了一种薄规格冷轧退火超高强度钢及其生产方法,所述超高强度钢化学成分组成及其质量百分含量为:C:0.15-0.25%,Mn:1.8-2.6%,Si:0.6-1.2%,S≤0.010%,P≤0.020%,Als:0.030-0.060%,Cr:0.30-0.60%,N≤0.006%,其余为Fe和不可避免的杂质;所述生产方法包括热轧带钢一次冷轧、罩式退火、二次冷轧、连续退火工序。相比本发明,CN108823499B化学成分合金成本高,采用的是罩式退火炉生产,生产效率低且钢带力学性能均匀性与表面质量控制较差。
因此,需要设计一种经济型低温连续退火冷轧高强钢带及其生产方法,以解决现有的冷轧钢冶炼过程中冶炼控制要求较高、生产成本高的问题。
发明内容
针对现有技术中存在的问题,本发明的目的在于提供一种经济型低温连续退火冷轧高强钢带及其生产方法。
本发明解决其技术问题所采用的技术方案是:一种经济型低温连续退火冷轧高强钢带,所述钢带化学成分组成及质量百分含量为:C:0.030~0.060%,Si≤0.050%,Mn:0.30~0.55%,P:0.015~0.025%,S≤0.020%,Als:0.020~0.060%,其余为Fe和不可避免的杂质。
具体的是,所述钢带厚度规格为0.3~1.5mm,宽度规格为1000~1800mm。
具体的是,所述钢带力学性能:屈服强度≥360MPa,抗拉强度≥450MPa,断后伸长率A50≥18.0%,硬度HRB≥70.0。
一种经济型低温连续退火冷轧高强钢带的生产方法,包括以下步骤:
1)对钢水冶炼并连铸成连铸板坯;
2)对连铸板坯进行热连轧,获得热轧钢带;
3)对热轧钢带进行连续酸冼与冷连轧,获得冷硬钢带;
4)对冷硬钢带进行连续退火,获得冷轧钢带。
具体的是,所述步骤1)中的连铸工序的连铸板坯厚度为230mm。
具体的是,所述步骤2)中的热连轧工序,精轧后的层流冷却模式为前段集中冷却,卷取温度为635±15℃,采用U型卷取模式,即钢带头尾30米的卷取温度比设计值高30℃。
具体的是,所述步骤3)中的连续酸冼与冷连轧工序,采用五机架串列式CVC+六辊冷连轧机冷轧总压下率为70~85%。
具体的是,所述步骤4)中的连续退火工序,采用立式全辐射管加热连续退火炉,退火炉区配备高精度的雷达式纠偏系统,退火均热温度为600~650℃,退火缓冷温度为550~580℃,退火过时效温度为355~385℃,采用六辊CVC湿式平整机,平整机延伸率为0.5~0.9%。
本发明具有以下有益效果:
本发明设计的经济型低温连续退火冷轧高强钢带及其生产方法
1)采用低碳、低锰、加磷的成分体系,不添加贵合金元素,低碳低锰可实现较低碳当量的控制,有利于用户加工焊接性能;磷具有较好的固溶强化效果,可提高钢基体的强度,在保证强度的同时降低了炼钢工序成本且可控性强,有利于工业化稳定生产;
2)热轧卷取温度对铁素体晶粒大小和碳化物析出有影响,为了获得细小的铁素体组织和细小的渗碳体析出,设定较低的卷取温度,并采用头尾30m高30℃的U型卷取模式,可确保全钢带长度方向的力学性能均匀性;
3)采用浅槽紊流盐酸洗以及五机架串列式CVC+六辊冷连轧机,轧机各机架均设计较高的轧制负荷能力,可实现70~85%冷轧大压下率的生产控制;
4)采用立式全辐射管加热连续退火炉,退火温度工艺曲线精度较高,可实现钢带微观组织及力学性能的精准控制;通过600~650℃低温退火,晶粒未能完全再结晶,呈扁平状,保留了部分轧制位错强化,提高了强度值;退火炉区配备高精度的雷达式纠偏系统,可防止钢带在低温退火过程中跑偏;采用六辊CVC湿式平整机,设计轧制负荷较高,可实现钢带0.5~0.9%的平整延伸率控制;
5)连续退火冷轧高强钢带屈服强度≥360MPa,抗拉强度≥450MPa,断后伸长率A50≥18.0%,硬度HRB≥70.0,在高强度的同时兼具良好的加工性能和表面质量,满足交通、建筑等行业的需求。
附图说明
图1是实施例1中的经济型低温连续退火冷轧高强钢带的典型金相组织图。
具体实施方式
以下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、完整地进一步详细的说明。基于本发明中的实施例,本领域普通技术人员在没有做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。
一种经济型低温连续退火冷轧高强钢带,钢带化学成分组成及质量百分含量为:C:0.030~0.060%,Si≤0.050%,Mn:0.30~0.55%,P:0.015~0.025%,S≤0.020%,Als:0.020~0.060%,其余为Fe和不可避免的杂质。
钢带厚度规格为0.3~1.5mm,宽度规格为1000~1800mm。钢带力学性能:屈服强度≥360MPa,抗拉强度≥450MPa,断后伸长率A50≥18.0%,硬度HRB≥70.0。
一种经济型低温连续退火冷轧高强钢带的生产方法,包括以下步骤:
1)对钢水冶炼并连铸成连铸板坯,连铸板坯厚度为230mm;
2)对连铸板坯进行热连轧,精轧后的层流冷却模式为前段集中冷却,卷取温度为635±15℃,采用U型卷取模式,即钢带头尾30米的卷取温度比设计值高30℃,获得热轧钢带;
3)对热轧钢带进行连续酸冼与冷连轧,采用五机架串列式CVC+六辊冷连轧机冷轧总压下率为70~85%,获得冷硬钢带;
4)对冷硬钢带进行连续退火,采用立式全辐射管加热连续退火炉,退火炉区配备高精度的雷达式纠偏系统,退火均热温度为600~650℃,退火缓冷温度为550~580℃,退火过时效温度为355~385℃,采用六辊CVC湿式平整机,平整机延伸率为0.5~0.9%,获得冷轧钢带。
表1为本发明实施例钢的化学成分(按重量百分比计),余量为Fe及其他不可避免的杂质。
表1本发明实施例钢的化学成分,单位:重量百分比(%)
化学元素 | C | Si | Mn | P | S | Als |
本发明 | 0.030~0.060 | ≤0.050 | 0.30~0.55 | 0.015~0.025 | ≤0.020 | 0.020~0.060 |
实施例1 | 0.045 | 0.023 | 0.38 | 0.019 | 0.005 | 0.060 |
实施例2 | 0.030 | 0.035 | 0.42 | 0.025 | 0.019 | 0.051 |
实施例3 | 0.060 | 0.015 | 0.35 | 0.016 | 0.006 | 0.020 |
实施例4 | 0.038 | 0.047 | 0.55 | 0.022 | 0.008 | 0.045 |
实施例5 | 0.050 | 0.021 | 0.30 | 0.015 | 0.012 | 0.033 |
通过铁水KR脱硫与转炉冶炼,走LF或RH精炼,连铸后板坯经过热轧与酸连轧后得到冷轧硬卷,再经过连续退火机组,得到本发明涉及的经济型低温连续退火冷轧高强钢带。主要工艺控制参数见表2。
表2本发明实施例钢的主要工艺控制参数
利用上述方法得到的经济型低温连续退火冷轧高强钢带,按照金属材料拉伸试验方法(GB/T 228.1)进行拉伸,其力学性能值见表3。
表3本发明实施例钢的力学性能
本发明不局限于上述实施方式,任何人应得知在本发明的启示下作出的结构变化,凡是与本发明具有相同或相近的技术方案,均落入本发明的保护范围之内。
本发明未详细描述的技术、形状、构造部分均为公知技术。
Claims (4)
1.一种经济型低温连续退火冷轧高强钢带的生产方法,其特征在于,包括以下步骤:
1)对钢水冶炼并连铸成连铸板坯;
2)对连铸板坯进行热连轧,获得热轧钢带,热连轧工序为精轧后的层流冷却模式为前段集中冷却,卷取温度为635±15℃,采用U型卷取模式,即钢带头尾30米的卷取温度比设计值高30℃;
3)对热轧钢带进行连续酸冼与冷连轧,采用五机架串列式CVC+六辊冷连轧机冷轧总压下率为70~85%,获得冷硬钢带;
4)对冷硬钢带进行连续退火,采用立式全辐射管加热连续退火炉,退火炉区配备高精度的雷达式纠偏系统,退火均热温度为600~650℃,退火缓冷温度为550~580℃,退火过时效温度为355~385℃,采用六辊CVC湿式平整机,平整机延伸率为0.5~0.9%,获得冷轧钢带;
所述钢带化学成分组成及质量百分含量为:C:0.030~0.060%,Si≤0.050%,Mn:0.30~0.55%,P:0.015~0.025%,S≤0.020%,Als:0.020~0.060%,其余为Fe和不可避免的杂质。
2.根据权利要求1所述的经济型低温连续退火冷轧高强钢带的生产方法,其特征在于,所述钢带厚度规格为0.3~1.5mm,宽度规格为1000~1800mm。
3.根据权利要求1所述的经济型低温连续退火冷轧高强钢带的生产方法,其特征在于,所述钢带力学性能:屈服强度≥360MPa,抗拉强度≥450MPa,断后伸长率A50≥18.0%,硬度HRB≥70.0。
4.根据权利要求1所述的经济型低温连续退火冷轧高强钢带的生产方法,其特征在于,所述步骤1)中的连铸工序的连铸板坯厚度为230mm。
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