薄板表面缺陷处夹杂物主要为FeO、CaO、SiO2、Al2O3、MgO等。通过控制120 t LF吹氩量≤200 L/min
钢包到中间包用长水口
中间包到结晶器用浸入式水口
合理改善中间包流场
采用中间包覆盖剂(%:39~43CaO、6~7SiO2、28~32MgO、2.3Al
2
O
3
)
采用结晶器保护渣(%:32CaO、33SiO
2
、1NgO、2.8Al
2
O
3
)等改进工艺措施
使冷轧镀锌板平均表面缺陷发生率从2006年的12.64%降至2007年的3.15%。
Abstract
The surface defects of cold rolled 0.8~1.0 mm sheet(≤0.07%C)produced by compact strip production (CSP)line with 900~1600mm×90~50 mm cast slab at Masteel have been analyzed by scanning electron microscope and energy dispersion spectrum analysis.Analysis results showed that the inclusions at surace defects of sheet were mainly Fe0
CaO
SiO
2
Al
2
0
3
MgOetc.The average surface defects occured ratio of cold rolled galvanized sheet from 12.64% in 2006 to3. 15% in 2007 by using improved process measures such as to control 120 t LF argon blown rate ≤ 200 L/min