我厂生产的烘缸属于I类压力容器，材质为HT300，硬度为220±30HB，其基本尺寸和形状见图，缸体铸件重约5t。机加工后，烘缸表面应具有较低的粗糙度和优良的耐磨性，不允许有夹渣、缩孔、气孔、砂眼、疏松及冷隔等铸造缺陷。1铁水熔炼与处理1．1生产条件生产用4t／h双排大间距热 I produced the dryer belongs to Class I pressure vessel, made of HT300, hardness of 220 ± 30HB, the basic size and shape shown in figure, the cylinder castings weigh about 5t. After machining, the dryer surface should have a lower roughness and excellent wear resistance, does not allow slag, shrinkage, porosity, trachoma, loose and cold casting defects such as casting defects. A hot metal smelting and processing 1.1 Production conditions Production 4t / h double row large spacing heat