1700热轧生产线的设计

摘要

板带材生产技术水平不仅是冶金工业生产进展水平的重要标志，也反映了一个国家工业与科学技术进展的水平。建设现代化的热轧宽带钢轧机要知足现代工业对热轧板品种质量的要求。最终产品的质量取决于连铸坯的质量，传统厚度的板坯连铸工艺明显优于薄板坯连铸工艺。薄板坯连铸连轧更适于生产中低档板材品种，在薄规格产品生产方面具有明显优势。为了知足高质量和高性能板材要求，采纳厚板坯常规连轧生产方式更合理。

基于这些考虑，本次设计结合唐钢1700mm、本钢1700mm、宝钢1580mm、鞍钢1780mm 热轧生产线设计了200万吨的1700mm常规热连轧生产线。在此设计中详细地介绍了加热、粗轧、热卷取、精轧、冷却、卷取等一系列进程。

其中精轧机选用六架大断面牌坊和高吨位轧制力轧机,采纳 HC轧机、CVC轧机、工作辊正弯辊（WRB）技术和厚度自动操纵（AGC）等技术来操纵板型和厚度。另外，为提高轧件温度，减少头尾温差，在精轧前采纳无芯轴隔热屏热卷箱。设计中涉及的技术参数大部份取自现场的体会数值，用到的部份公式也是来自于实际的体会公式。关键词: 常规热连轧；热卷箱；层流冷却；厚度自动操纵

ABSTRACT

The hot strip production technique level not only is a important marking of the metallurgy industry produce development level, but also reflect a level of the national industry and science new modernizational hot wide rolling mills should satisfy the request of modern industry to hot strip species quality of end product is by all means decided by quality of continous casting slab. The continous casting slab of traditional thickness is obviously better than thin slab continous casting and rolling. Thin slab continous casting and rolling is suitable to produce medium low file time plank material species and have obvious advantage at the thin specification satisfying the request of obtaining the high quality and high performance strip, thick slab continous casting produce method is considered more reasonable.

Based on the above premise, this design combine Tang steel 1700 ,Ben steel 1700, Bao steel 1580 and An steel 1780 hot rolling production line to design million ton traditional hot continuous rolling workshop. In this paper it is detailly introduced the heat furnace, the rough rolling, the hot curl, the

finish rolling, the laminar cooling, the curl and so on.

Among them, The finishing mill still selected the big cross section memorial arch and the high tonnage rolling stand, and choosed HC mill,CVCmill,work roll bend technique and automatic gauge control to control strip shape and thickness. Moreover, in order to raise the temperature of rolling metal and reduce the difference temperature between tail and head of rolling metal,I establish a hot curl box between the rough rolling and the finishing rolling. The coefficient in this design and parts of formulas come from actual experience.

Key words: convensional continuous rolling , the laminar cooling, automatic gauge control

引言

板带产品的技术要求具体表现为产品的标准，包括四个方面：(1)尺寸精度高。板带钢一样厚度小、宽度大，厚度的微小波动将引发利用性能和金属消耗的庞大转变，板带必需具有高精度尺寸。(2)无板形缺点。板带越薄，对板形不均的灵敏性越大。

(3)保证表面质量。板带表面不得有气泡、结疤、拉裂、刮伤、折叠、裂痕、夹杂和氧化铁皮压入。(4)具有优良性能。板带钢的性能要求要紧包括机械性能、工艺性能和某些钢板的特殊物理或化学性能。

目前传统热轧宽带钢轧机采纳的特色技术有：

(1)连铸坯热装和直接热装。该技术要求炼钢和连铸机稳固生产无缺点板坯；热轧车间最好和连铸机直接连接，以缩短传送时刻；在输送辊道上加设保温罩及在板坯库中设保温坑；板坯库中要具有相应的热防护方法。

(2)板坯定宽压力机。可持续进行板坯侧压，运行时刻短，效率高，板坯温降小，侧压后板坯头尾形状好，狗骨断面小，板坯减宽侧压有效率达90 %以上。

(3)粗轧机短行程操纵和宽度自动操纵。经立辊宽度压下及水平辊厚度压下后 , 板坯头尾部将发生失宽现象。依照其失宽曲线采纳与该曲线对称的反函数曲线 , 使立辊轧机的辊缝在轧制进程中不断转变。如此轧出的板坯再经水平辊轧制后 , 头尾部失宽量减少。

(4)中间坯保温技术和边部感应加热技术。中间坯长度可达80～90m，进精轧机轧制进程中为减少带坯头尾温差，设置保温罩是简单有效的技术。精轧机组前的带坯边部电感应加热器是针对轧制薄规格产品和硅钢、不锈钢、高碳钢特殊品种设置的。

从我国目前板带市场需求情形和生产能力来看，热轧板的生产能力大大高于冷轧