中薄板坯生产冷轧用料的轧后热处理研究.pdf

总第196期
炳金
Total No 196
2012年第4期
IEBEI METALLURGY
2012. Number 4
中薄板坯生产冷轧用料的轧后热处理研究
马欣然',赵翔2,杨业2,郭保强,郑中白2
(1.河北钢铁集团唐钢中厚板材有限公司,河北唐山063002;2.河北联合大学治金与能源学院,河北
唐山063009)
摘要;通过对中薄板坯生产冷轧用料进行取样检测,发现力学性能较高,组织混乱,晶粒大小不ー,呈针
叶片状;TEM位错塞积比较多,晶界处位错密度大,生产冷轧基料困难。为改进原料性能,采用快速退
火处理,晶粒形状和均匀度明显改善,内部微观组织位错密度减少,强度下降,冷轧性能提高
关键词:中薄板坯;力学性能;晶粒尺寸;TEM位错;快速退火;冷轧性能;提高
中图分类号:TG156.2
文献标识码:A
文章编号:1006~-5008(2012)04-0058-03
STUDY ABOUT BEHIIND -ROLLING HEAT
TREATMENT OF BASE MATERIAL FOR COLD
ROLLING WITH HOT-ROLLED MEDIUM OR THIIN SLAB
Ma Xinran", Zhao Xiang, Yang Ye", Guo Baoqiang", Zheng Shenbai'
1. Medium and Thin Sheet Co, Ltd, Tangshan Iron and Steel Company, Hebei Iron and Steel Group,
Tangshan, Hebei, 063002 2. Metallurgy and Energy Resource Institute, Hebei Union niversity, Tangs
han, Hebei, 063009)
Abstract: Through sampling examine, the material for cold rolling come from hot-rolled medium or thin slab
is found to have relative high mechanical properties, structure being disorder, grain size not uniform and ap
pearing as leaf blade; TEM dislocation pile-up rather much, dislocation density fairly large at grain bounda-
ry, and hard to be used to make base material for cold rolling. To solve the problem fast annealing is adopted
and consequently grain shape and degree of consistency get obviously improved, dislocation density of inner
micro-structure reduced, strength lowered down, and cold rolling performance improved
Key Words: medium and thin slab mechanical property; grain size; TEM dislocation; fast annealing; cold
rolling performance; improvement
]引言
性能方面较为接近,但仍有不足,如强度高、伸长率
传统厚坯轧制带卷,总压缩比大,两架可逆粗轧低,影响后续冷轧加工性能。
机轧制时,每道回复时间充足,晶粒畸变基本被消除
本文探讨中薄板坯热轧后在线或离线退火工
后再继续变形,经过多道次轧制,最后热卷产品晶粒艺,改善其组织形态,提高性能,适应冷轧要求。
均匀饱满,屈服强度低,强屈比高,适合冷轧。薄板2试验材料和研究方法
坯轧制带卷压缩比小,轧制连续性强,每道之间间隔2.1与厚坯试验比较
时间短,轧后回复时间不充裕,造成产品晶粒细碎,
对首钢京唐(2架可逆+7架精轧连轧)厚坯所
不均匀,畸变能高,屈服强度大,强屈比小,不适合作生产的SPHC低碳板带钢和某厂(1架可逆+7架精
为冷轧原料。中薄板坯轧制热帯卷介于两者之间。轧连轧)中薄坯生产SPC低碳板带钢取样,进
试验检测表明,中薄板坯产品和普通厚板坯连铸连行显微组织与力学性能检测比较,见图1~3。试样
轧线生产的热轧板在组织形态、晶粒度大小和力学加工、性能指标的测定参照GB/T28-2002进行。
收稿日期
作者简介:马欣然(1984-),女,助理工程师,2008年毕业于河北理
工大学金属材料工程专业,现在河北钢铁集团唐钢中厚板材有限公
司工作、E-mail:nxr200637@163.com