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Kesri Steels Limited - Alloy Steel Castings
An alloy is a combination, either in solution or compound, of two or more elements, where the resulting material has metallic properties. Iron and Steel foundry is prepared to meet the casting needs of various industries, including power generation, valves, pumps, mining and material handling.
Alloy steel castings are those in which special alloy elements have been added in sufficient quantities to obtain or increase certain desirable properties.
There are two types of alloy steels
- Low alloy steels with an alloy content totaling less than 8 percent and
- High alloy steels with their content totaling more than 8 percent.
High Alloy steel Casting: Cast high alloy steels are widely used for their corrosion resistance in aqueous media at or near room temperature and for service in hot gases and liquids at elevated and high temperatures (> 650°C).
Corrosion-resistant high-alloy casting steels, more commonly referred to as cast stainless steels; have grown steadily in technological and commercial importance during the past 40 years. Corrosion-resistant high-alloy cast steels are usually classified on the basis of composition or microstructure.
The principal applications for these steels are for chemical-processing and power-generating equipment involving corrosion service in aqueous or liquid-vapor environments at temperatures normally below 315°C. These alloys are also used for special services at temperatures up to 650°C.
Mechanical properties of these grades (for example, hardness and tensile strength) can be altered by suitable heat treatment. The cast high-alloy grades that contain more than 20 to 30% Cr+Ni, however, do not show the phase changes observed in plain carbon and low-alloy steels during heating or cooling between room temperature and the melting point. These materials are therefore non hard enable, and their properties depend on composition rather than heat treatment. Therefore, special consideration must be given to each grade of high-alloy cast steel with regard to casting design, foundry practice, and subsequent thermal processing.