利用扫描电镜对80 t LF钢液喂钙处理前后的冷镦钢SWRCH22A中夹杂物形态和组成的变化进行了分析和研究
对钙处理钢中夹杂物的变性进行了热力学计算。研究表明
SWRCH22A钢液钙处理后夹杂物中的Mn被Ca置换
中间包内钢中Al
2
O
3
夹杂变性生成低熔点铝酸钙夹杂12CaO·7Al
2
O
3
如要钢液钙处理生成易上浮排除的液态12CaO·7Al
2
O
3
夹杂的必要条件是[Al
]
T
2
/[Ca
]
T
3
≤10.58×10
4
。
Abstract
The change of morphology and ingredient of inclusions in cold heading steel SWRCH22 A before and after feeding calcium wire in 80 t LF liquid steel has been analyzed and studied by scanning electron microscope
and the thermodynamics calculation for modification of inclusions in steel by calcium treatment is carried out. Research results show that after calcium treatment of liquid steel SWRCH22A the Mn in incdusions is placed by Ca
the inclusion Al
2
O
3
in liquid steel in tundish is modified to form low melting point calcium aluminate 12CaO·7Al
2
O
3
and during calcium treatment of liquid steel the necessary condition to form easily floating up and removing liquid inclusion 12CaO·7Al