Characteristics of different investment steel castings

Carbon steel can be divided according to the carbon content: C≤0.20% - low carbon steel investment castings; C: 0.2~0.5% - medium carbon steel; C≥0.5% - high carbon steel. Investment steel castings. According to the chemical composition, cast steel is divided into: carbon steel investment casting and alloy steel investment casting. Now we will analyze the characteristics of precision lost foam casting, low alloy steel investment casting, special steel investment casting and carbon steel investment casting.

1. Low-alloy steel investment castings: steel investment castings containing alloying elements such as manganese, chromium, and copper. Alloying elements are usually less than 5%. They have greater impact toughness and can be heat treated for better mechanical properties. Low alloy steel investment castings have better performance than carbon steel investment castings and have increased service life.

2. Special steel investment castings: Special alloy steel investment castings are refined to meet special needs. The lost foam casting process has a variety of varieties, usually containing one or more high-content alloying elements to obtain a certain special performance. For example, high manganese steel containing 11% to 14% manganese has good impact resistance and wear resistance, and is widely used in the manufacture of wear-resistant investment castings for mining machinery and engineering machinery. Stainless steel, the main alloy steel element is chromium or nickel chromium, used to manufacture investment castings under corrosion or high temperature conditions above 650 ℃, such as valves, pumps, steam turbine casings, etc.

3. Carbon steel investment casting: a steel investment casting whose main element is carbon and a small amount of other elements. Low carbon steel investment castings have a carbon content below 0.2%, medium carbon steel investment castings have a carbon content between 0.2% and 0.5%, and high carbon steel investment irons have a carbon content above 0.5%. As the carbon content increases, the strength and hardness of carbon steel investment castings will increase. Carbon steel has high strength, plasticity and toughness, and low cost. Therefore, precision lost foam castings are used to manufacture heavy-duty castings in heavy industries, such as rolling mill stands, hydraulic press bases, etc. In addition, it is used in the manufacture of parts with high force and can withstand the impact of the railway and rolling stock industry, such as bolsters and side frames, wheels and couplers, etc.

The carbon and alloy content will determine the properties and classification of steel investment castings. Different steel investment castings are used in different ways. Therefore, how to choose the right material is very important.