Difference Between Forged Steel Ball and Cast Steel Ball
In the field of wear-resistant steel balls, there are two types of steel balls that operate in ball mills or semi-automatic mills, one is forged steel balls (YB/T091-2019), and the other is cast steel balls (YB/T092-2019). Both belong to grinding steel balls and are applicable to different fields such as mining and cement. What are the differences between these two types of steel balls
1. Different materials: forged and rolled steel balls are made of high-quality round steel or high-quality bonded steel with C content less than 1.4, so they are called steel balls after forging and rolling; The cast ball material is scrap steel. After smelting and adding alloy, it can reach the C content of 2.2~3.5, which is the composition of iron. After casting heat treatment, it is exactly called iron ball;
2. The physical properties are also fundamentally different: the impact toughness of forged and rolled steel balls is greater than 12J/cm ²， The crushing rate is less than 1%; The impact toughness of cast ball is only 2 ～ 6J/cm ²， The crushing rate is about 3%;
3. The difference of surface quality: the casting ball is produced by using a mold, and the surface has a pouring port, sand holes and a ring belt; The surface of forged ball is smooth, the surface quality is better than that of cast ball, and it does not deform during use;
4. Different hardness: such as 100mm * B2 steel ball, surface hardness HRC56~HRC65, core hardness HRC45~50; Cast steel ball is also 100mm, with surface hardness of HRC56~HRC65 and core hardness of HRC54~63;
5. Different application fields: the forged ball is made of high-quality alloy steel. The mechanical properties of alloy elements make it have natural corrosion resistance. The advanced heat treatment process makes the ball more corrosion resistant. Dry grinding (temperature no more than 100 degrees) and wet grinding are applicable; Cast ball is only suitable for dry grinding. When it is used in wet grinding, iron is fragile when it meets water due to temperature; This is commonly referred to as the "heat resistant" ball, which is suitable for dry grinding. For example, the casting ball for cement plants is suitable, the forging ball can be called the "corrosion resistant" ball, and the forging ball for wet grinding, mineral processing and other purposes is suitable. In particular, the semi autogenous mill or the ball above 100mm, the casting ball is easy to break, and the effect of forging ball is far better than the casting ball.
6. In addition, there are different ways of heat treatment: one is water quenching (or quenching liquid), the other is oil quenching (or air quenching).
