Casting properties of carbon steel compared with cast iron

Keywords:carbon steel, cast iron
Black cast iron has better casting properties than carbon steel. The liquid alloy is filled with a mold, and the ability to obtain a complete shape and a clear profile is called the filling ability of the liquid alloy. Insufficient filling ability will result in insufficient casting or cold insulation defects in the casting. The so-called under-filling means that the shape of the casting is incomplete; the cold-separating means that the seam is formed somewhere on the casting due to the unfusion of two or more metal streams. The main factors affecting the filling ability: the fluidity of the alloy, the casting conditions, the filling conditions of the mold, and the structure of the casting.

If low carbon steel has better forging performance than high carbon steel, it is because the carbon content is low, the strain stress during forging is not so easy to be brittle, the internal stress of cast iron is very large, and there are a lot of dislocation impurities. It is easy to be brittle, not because it has strong casting ability. It can't be forged. Of course, spheroidal cast iron can be cast, but the cost problem is worth considering. The carbon steel is not cast, not that it is not cast. It is definitely also obtained by casting, but forging will get better performance. We usually forge low carbon steel and cast high carbon steel, which is more suitable for medium carbon steel in locomotive machining.

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