This paper provides a possible application of steam curing on hauyne-belite cement made from blast furnace slag, gypsum and calcium carbonate for the manufacture of prefabricated materials. Cements blended with gypsum and anhydrite have been solidified under equilibrated vapour with boiling water and then bending and compressive strengths have been tested in terms of blending amount and age up to 20 percent and 4 weeks.