Thermal reduction annealing and rare earth zinc Aluminum Alloy a steel strip continuous hot dip plating process, which consists of two parts: rare earth zinc Aluminum Alloy reduction and annealing process of steel strip continuous hot-dip zinc Aluminum Alloy continuous hot-dip hot plating technology. Through the determination of rare earth zinc to Aluminum Alloy for strip coating, rare earth zinc can improve the Aluminum Alloy on the strip surface wettability and enhance the liquidity of the zinc liquid, to form the best electrochemical protection film on steel strip surface; the reduction of the heating section divided into two sections, which can increase the recrystallization temperature of strip, and the strip the surface reduction is smooth; the air inlet and the air outlet are respectively arranged in the thermal tensioning section and / or at the bottom of the cooling section and the heating section before the reduction at the top, which not only reduces the dew point value, and improve the protection of gas furnace, zinc pot into the strip has an active surface. The technical scheme, to further enhance the technical level of continuous hot dip galvanized strip, hot galvanized steel corrosion, electrochemical corrosion resistance has been improved significantly, for the domestic hot galvanized strip to the automotive industry applications development has played a very positive role.
【技术实现步骤摘要】
本专利技术涉及带钢镀锌工艺,尤其带钢热镀稀土锌铝工艺。
技术介绍
带钢连续热镀锌工艺流程,就是顺序排列着的对带钢进行开卷、焊接、脱脂、还原 退火、热镀、光整拉矫、表面处理、收卷等处理过程。其中的还原退火工艺,是对形变后的带钢通过升高度温退火并进行再结晶消除内 应力、恢复可塑性的过程。根据带钢镀锌要求高低与带钢材质的不同,尤其带钢镀锌要求高 低的不同,分有对带钢预加热、还原加热、还原均热、冷却、均衡、热张紧六个工艺段,或者, 分为对带钢还原加热、还原均热、冷却、热张紧四个工艺段。带钢在还原退火过程中,各工艺 段的温度,是根据带钢热镀锌要求的高低与带钢材质的不同而设定与控制的。保护气体由 设置在热张紧段和/或冷却段气体入口进入,废气从设置在预加热段或还原加热段的气体 出口引向室外放空,且带钢密封地进入锌锅,使还原退火炉成为一个无氧环境,是保证带钢 进入锌锅前具有一个清洁的无氧化物存在的还原成适合热镀锌的活性海绵状纯铁表面的 必要技术条件。其中的热镀工艺,是在带钢表面镀上锌镀层的过程。锌或锌合金在锌锅里受热熔 化成锌液,带钢绕于锌锅里的沉没辊且随沉没辊转动进入锌锅, ...
【技术保护点】
1.一种带钢连续热镀稀土锌铝合金的还原退火与热镀工艺,所包含的带钢连续热镀稀土锌铝合金的还原退火工艺,其特征是:该工艺是在分有包括前还原加热段和后还原加热段的还原加热段、还原均热段、冷却段、热张紧段结构的还原退火炉内进行的,主要工艺内容包括带钢还原退火工艺阶段、带钢在还原退火炉内运行、保护气体在还原退火炉内流通、带钢在各工艺段的温度以及露点值和带钢再结晶温度保持时间设定与控制;带钢还原退火工艺阶段,依据还原退火炉的结构,分设成顺序排列着的带钢还原加热过程、带钢还原均热过程、带钢冷却过程、带钢热张紧过程共四个工艺阶段,且将带钢还原加热过程又依据还原退火炉的结构进一步分设成带钢 ...
【技术特征摘要】
【专利技术属性】
技术研发人员:李庆富,徐国林,
申请(专利权)人:浙江永丰钢业有限公司,
类型:发明
国别省市:33
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