Cast steel is steel used for castings, which is a type of casting alloy. Cast steel is a way of industrially producing parts and is also a widely used method. Cast steel can be divided into different types of cast steel according to the different carbon content. Carbon cast steel is divided according to carbon content: C≤0.20% is low carbon cast steel; C0.2 ～ 0.5% is medium carbon steel; C≥ 0.5% is high carbon steel. Cast steel can be divided according to chemical composition: carbon cast steel and alloy cast steel. Alloy steel is divided into low alloy steel and high alloy steel according to alloy element content. The following analyzes the characteristics of three different types of cast steel: cast low alloy steel, cast special steel and cast carbon steel.
1. Cast low alloy steel: Cast steel containing alloy elements such as manganese, chromium, and copper. The total amount of alloying elements is generally less than 5%, has greater impact toughness, and can obtain better mechanical properties through heat treatment. Casting low alloy steel has better performance than carbon steel, which can reduce the quality of parts and increase the service life.
2. Cast special steel: alloy cast steel refined to meet special needs, there are many varieties, usually containing one or more high-level alloy elements to obtain a certain kind of special properties. For example, high-manganese steel containing 11% to 14% of manganese can withstand impact and wear, and is mostly used for wear-resistant parts of mining machinery and engineering machinery; various stainless steels with chromium or chromium-nickel as the main alloy element are used for Parts that work under high temperature above ℃, such as chemical valve body, pump, container or steam turbine casing of large-capacity power station.
3. Cast carbon steel: Cast steel with carbon as the main alloying element and containing a small amount of other elements. Casting low carbon steel is less than 0.2% carbon, casting medium carbon steel is 0.2% to 0.5% carbon, and casting high carbon steel is more than 0.5% carbon. With the increase of carbon content, the strength and hardness of cast carbon steel increase. Cast carbon steel has high strength, plasticity and toughness, and has low cost. It is used in heavy machinery to manufacture parts that bear large loads, such as rolling mill frames and hydraulic press bases. It is used to produce large forces on railway vehicles. Parts subject to impact such as bolsters, side frames, wheels and couplers.
The amount of carbon and alloy content determines the classification of cast steel and the characteristics of cast steel. The range of use of different cast steels is also different, so it is very helpful for the correct purchase of cast steel. Buyers should carefully understand the characteristics and choose the steel castings reasonably.