The invention discloses an economical high aluminum and low silicon TRIP high strength steel for automobile and its preparation method, which belongs to the field of high strength steel production technology for automobile. The mass percentage of TRIP steel composition is C:0.15 ~ 0.25%, Si:0.1 ~ 0.5%, Al:1.5 ~ 3%, Mn:1.5 ~ 2.5%, Cu:0.1 ~ 1%, P<, 0.01%, S<, 0.005%, and the allowance is Fe. Preparation methods, including the following processes: melting, pouring, forging, thermal insulation, hot rolling, coiling, pickling, cold rolling, annealing treatment. The steel contains less microalloying elements, which is economically beneficial for recycling. Al partially replace Si to increase elongation and enhance the galvanizing properties of cold rolled steel sheet. A small amount of Cu is added to make up for Al's strength defects and increase tensile strength through solid solution and precipitation strengthening. The heat treatment process is achieved by two phase annealing and bainite zone insulation. The cold-rolled plate with a tensile strength greater than 780MPa, a elongation of over 25%, a maximum elongation of 30%, and a good shape and surface quality is obtained. Bainite zone temperature is over 460 DEG C, can achieve galvanized plating process, annealing integration, production of automotive high strength galvanized plate.
【技术实现步骤摘要】
一种汽车用经济型高铝低硅TRIP钢及其制备方法
本专利技术属于汽车用高强钢生产
,特别涉及一种汽车用经济型高铝低硅TRIP钢及其制备方法。
技术介绍
先进连续退火与涂镀技术对于热轧-冷却-热处理一体化组织性能控制提出了要求:开发出新一代控制轧制及控制冷却技术;建立绿色化热轧钢材成分和工艺体系,实现“资源节约”和“工艺减量”;60~80%的热轧钢材强度提高100~200MPa,或主要合金元素节省20~30%,节省钢材5~10%,节能10~15%。低碳微合金钢能适应连续退火和热镀锌退火,新一代高强TRIP钢具有强度高、延展性好能优良性能,应用前景广阔。中国专利技术专利申请公开说明书CN102312157A公开了一种高强冷轧TRIP钢的制备方法,成分为:C:0.18~0.23%,Si:1.3~1.6%,Mn:2.1~2.3%,Nb:0.03~0.05%,V:0.03~0.09%,P≤0.01%,S≤0.01%,Al:0.8~1.2%,N≤0.005%。强度虽然达到1000MPa,但是延伸率低于20%。且加入贵重合金元素较多,增加成本,硅含量过高,表面质量不好,镀锌性能不够。中国专利技术专利申请公开说明书CN106868403A公开了一种高表面质量的热镀锌TRIP钢板及其制造方法,成分为:C:0.10~0.15%,Mn:1.20~1.80%,Al:1.20~2.40%,P≤0.03%,S≤0.03%,余量为Fe和不可避免的杂质。这种成分的钢,由于去除了TRIP钢中的Si元素并以Al代替,固溶强化效果显著降低,所生产的钢强度较低,不能满足新一代汽车用钢的要求。 ...
【技术保护点】
一种TRIP钢,其特征在于,所述TRIP钢成分的质量百分数为:C:0.15~0.25%,Si:0.1~0.5%,Al:1.5~3.0%,Mn:1.5~2.5%,Cu:0.1~1.0%,P<0.01%,S<0.005%,余量为Fe。
【技术特征摘要】
1.一种TRIP钢,其特征在于,所述TRIP钢成分的质量百分数为:C:0.15~0.25%,Si:0.1~0.5%,Al:1.5~3.0%,Mn:1.5~2.5%,Cu:0.1~1.0%,P<0.01%,S<0.005%,余量为Fe。2.权利要求1所述TRIP钢的制备方法,包括以下工序:熔炼、浇注、锻造、保温、热轧、卷取、酸洗、冷轧、退火处理,其特征在于,所述退火处理,包括三个阶段:(1)在保护气氛下,加热至900~950℃,保温1~3min...
【专利技术属性】
技术研发人员:邸洪双,黄慧强,闫宁,李洋,郭晓妮,邓永钢,张洁岑,
申请(专利权)人:东北大学,
类型:发明
国别省市:辽宁,21
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