Metal mixers were the storage and buffering units for pig iron at the entegrated steel plants in the past. Nowadays their functions were replaced by the torpedo cars. But their importance are still going on in most of the steel complex allover the world.

Item 项目		Refractory castable 耐火浇注料
		HJ60	HJ65	HJ70	HJ60S
Al2O3 (%)	≥	60	65	70	60
SiC (%)	≥	-	-	-	10
Bulk density 体积密度 (g/cm3)	≥	2.4	2.6	2.7	2.6
Modilus of rupture 常温抗折强度 (MPa)	110℃*24h	4	5	5	4
	1400℃*3h	6 (1350℃*3h)	8	8	6
Cold crushing strength 常温耐压强度 (MPa)	110℃*24h	30	30	30	25
	1400℃*3h	50 (1350℃*3h)	50	60	50
Reheating Linear Change rate 重烧线变化率 (%)	1400℃*3h	±0.5 (1350℃*3h)	±0.5	±0.5	±0.5
Application 应用		炉顶	炉底、炉壁	渣线、铁嘴
		Top	Side wall, bottom	Slag line, Decharge mouth