During the casting of hardox500 wear-resistant plate, the effect of suspending agent can be reflected only when it is completely melted in the gating system and in the mold cavity, and the melting time should not be too long. That is to say, the metal powder is melted completely within the time when the molten steel flows in the gating system and the superheated heat is lost in the cavity. If there are too many particles, some of them will not melt when the molten steel begins to solidify. This part of metal powder is surplus, which not only wastes materials, but also causes defects in the metal. If the particle size is too small and the quantity is too small, it can not play the expected role.
在浇注时，HARDOX500耐磨板钢水中加入悬浮剂，窿就会增大液体金属流动时的摩擦阻力。悬浮剂还起到内冷铁的作用，使温度降低，钢水的流动性也随之下降。用断面为梯形，截面积为悬浮浇注和非悬浮0.3cm2、 0.56cm2、0.5cm2、 l.0cm2浇注钢水流动性的比较的流动性试样测定加入金属粉和不卜非悬浮浇注悬浮浇注加金属粉的钢水的流动性，以钢水充填的长度作为流动性的衡量标志。悬浮浇注的钢水的流动性较对比的钢水低15％一20％。为保持充填程度相同则必须相应扩大浇注系统的截面积。
When casting, adding suspending agent into hardox500 wear-resistant plate molten steel, the hole will increase the friction resistance of liquid metal flow. The suspending agent also acts as an internal chill, which reduces the temperature and the fluidity of molten steel. The fluidity of molten steel with and without metal powder was measured by the fluidity sample with trapezoidal cross-section and 0.3cm2, 0.56cm2, 0.5cm2 and 1.0cm2 cross-section. The fluidity of molten steel with metal powder and without metal powder was measured by the filling length of molten steel. The fluidity of the suspension casting molten steel is 15% - 20% lower than that of the contrast molten steel. In order to keep the same filling degree, the cross-sectional area of gating system must be enlarged accordingly.
Usually, before the molten steel of hardox500 wear-resistant plate enters the mold cavity, there is a space for the molten steel to rotate in the mold, which aims to make the metal powder and molten steel mix evenly. At this point, the molten steel and metal powder are mixed evenly in the process of rotation. Molten steel is introduced tangentially from the gate cup through the runner and rotates in the cylindrical cavity.
A certain amount of suspending agent is put into the funnel. When it falls, it is mixed with molten steel and then enters the sprue. The position of the hole at the bottom of the cylindrical cavity should be avoided to be directly opposite to the outlet of the tangential inclined runner, so as to prevent the molten steel from flowing out of the inclined runner and flowing down into the sprue immediately. Generally, it should be staggered at an angle. When molding, the guide runner and cylindrical cavity are made in the additional box. Although the mixing effect of this method is slightly worse than that of the former one, the gating system is simple and the casting process is greatly simplified. The practice shows that the purpose of suspension casting can be achieved.