Cast iron is the most widely used cast metal material in modern industrial production. Generally, it has been widely used in various sectors such as machinery manufacturing, metallurgical mining, petrochemical industry, transportation and national defense industry. Cast steel is widely used in many heavy and dynamic mechanical parts.

According to the existence of graphite in cast iron, cast iron can be divided into gray cast iron, white cast iron, nodular cast iron, vermicular graphite cast iron, etc., according to the special properties of cast iron can be divided into anti-friction cast iron, chilled cast iron, wear-resistant cast iron , heat-resistant cast iron, etc. Each cast iron is used differently because of its special properties.

Types and applications of cast steel

Cast steel can be divided into cast high alloy steel, cast low alloy steel and so on according to its alloy content. Although cast carbon steel is widely used, it has many deficiencies in performance, such as poor hardenability, and thick section castings cannot be strengthened by quenching-tempering treatment; the operating temperature range is limited to 40-400 ℃; wear resistance and resistance Corrosion is poor, etc., can not meet the needs of modern engineering, so the manufacture of alloy steel has been developed.

Cast low-alloy steel is a type of steel that is formed by adding one or several alloying elements with a small amount on the basis of the chemical composition of cast carbon steel. Its alloy content generally does not exceed 5%.

Chromium-based cast low-alloy steel, chromium makes the steel have relatively good hardenability, and can improve the strength of the alloy at the same time. However, its disadvantage is that it has temper brittleness, so an appropriate amount of molybdenum is usually added to reduce the tendency of temper brittleness, because cast steel can obtain higher hardness and strength after heat treatment, and is often used for casting gear blanks and other important castings.

Cast carbon steel. Cast steel with carbon as the main alloying element and small amounts of other elements. Casting low carbon steel with carbon content less than 0.2%, casting medium carbon steel with carbon content of 0.2% to 0.5%, and casting high carbon steel with carbon content greater than 0.5%. 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 low cost. It is used in heavy machinery to manufacture parts that bear heavy loads, such as rolling mill stands, hydraulic press bases, etc. Parts that are also impacted such as bolsters, side frames, wheels and couplers.

Cast special steel. Alloy cast steel made to meet special needs has a wide variety, usually containing one or more high-alloying elements to obtain certain special properties. For example, high manganese steel containing 11% to 14% manganese can resist impact wear and is mostly used for wear-resistant parts of mining machinery and construction machinery; various stainless steels with chromium or chromium-nickel as the main alloying elements are used in corrosion or 650 Parts that work under high temperature conditions above ℃, such as chemical valve bodies, pumps, containers or steam turbine casings of large-capacity power plants.

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