What are casting technique’s characteristics of cast steel china

1. What are casting technique’s characteristics of cast steel china What are casting technique’s characteristics of cast steel china? Believe it or not, many people know little about it. Today, Ningbo Parfect steel foundry , the professional steel castings manufacturer will lead you to learn more about it. Cast steel china has better mechanical properties than cast iron, but its casting performance is worse than cast iron. Because cast steel has higher melting point, poor flowability, large shrinkage rate and its liquid is easy to oxidize, 10 ~ 14% body shrinkage rate, 1.8 ~ 2.5% line shrinkage rate. To avoid misrun, cold lap, sinkhole, shrinkage porosity, crack, sticky

2. sand, and other defects, it must be taken more complex process measures than cast iron. First is to prevent cool lap and misrun. The wall of steel castings can not be less than 8mm due to bad flowability of cast steel; the pouring system structure should be simple as possible and its cross-section area size is larger than cast iron; the dry/hot pattern is adoptable; It need to raise the temperature of pouring, generally 1520 c°~ 1600 c°to improve the flowability of cast steel because cast steel can exist in liquid form due to longer overheating time. However, extra pouring temperature will cause thick and big crystal grain, hot crack, bubble hole, sticky sand, etc. Therefore, tiny ,wall-thin and complex castings, their pouring temperature is 150c ° higher than cast steel’s melting point while for large and wall-thick castings, their pouring temperature is 100C°than the melting point of cast steel. Second is to prevent shrinkage porosity, shrinkage holes. Due to worse shrinkage of cast steel than cast iron, dead head, cold iron and subsidies and other measures should be taken to achieve progressive solidification. In addition, in order to prevent the steel castings from shrinkage, shrinkage, pores and cracks, its wall thickness should be uniform to avoid

3. sharp and right angle structure. In the sand of mold, the sawdust should be added and in the mould core, coke should be added. Hollow core or oil core is adoptable to improve the concession and permeability of sand mold and mold core. The pouring temperature of cast steel resulting from its high melting point.It is easy to appear sticky sand defects when steel liquid is poured into mould and have interaction with its material. So, man-made silica sand which has high refractoriness is fit for cast mould. Besides, the surface of mould should be coated with material made of quartz power or zircon slurry. In order to reduce the gas source, improve the flowability of cast steel and its casting strength, most of the cast steel castings should be made with dry or quick-dry cast mould, such as CO2 -hardened water glass sand type of sand mould. More parfect steel casting manufacturers news , welcome to visit website :casting-forgings.com for details