According to chemical composition, cast steel can be divided into two categories: carbon cast steel and alloy cast steel. Among them, carbon cast steel is the most widely used, accounting for more than 80% of the total cast steel production.

1. Carbon cast steel
Generally speaking, low carbon steel ZG15 has a high melting point and poor casting performance, and is only used to manufacture motor parts or carburized parts;
Medium carbon steel ZG25~ZG45 has higher comprehensive properties than all types of cast iron, that is, high strength, excellent plasticity and toughness, so it is suitable for manufacturing parts with complex shapes and high strength and toughness requirements, such as train wheels and forging hammers. Frames and anvils, rollers and high-pressure valves, etc., are the most commonly used types of carbon cast steel;
High carbon steel ZG55 has a low melting point and its casting performance is better than that of medium carbon steel. However, its plasticity and toughness are poor and it is only used to manufacture a few wear-resistant parts.
2. Alloy cast steel
According to the total amount of alloying elements, alloy cast steel can be divided into low alloy steel and high alloy steel.
(1) Low alloy cast steel, mainly used in manganese series, manganese-silicon series and chromium series. Such as ZG40Mn, ZG30MnSi1, ZG30Cr1MnSi1, etc. It is used to make parts such as gears, hydraulic press working cylinders and turbine rotors, while ZG40Cr1 is often used to make important stress-bearing parts such as high-strength gears and high-strength shafts.
(2) High alloy cast steel with special properties such as wear resistance, heat resistance or corrosion resistance. For example, high manganese steel ZGMn13 is a kind of anti-wear steel, mainly used to manufacture parts used under dry friction working conditions, such as the grab front wall and grab teeth of excavators, tracks of tractors and tanks, etc.; Chromium-nickel stainless steel ZG1Cr18Ni9 and chromium stainless steel ZG1Cr13 and ZGCr28, etc., have high corrosion resistance to nitric acid and are mainly used to manufacture parts for chemical, petroleum, chemical fiber and food equipment.
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