Introduction to steel castings
Steel castings are parts made of cast steel, which have similar properties to cast iron, but better strength than cast iron. Steel castings are prone to defects such as porosity defects and inaccurate angle positioning during the casting process, and the casing fracture may occur during long-term use.
Product advantages
One of the advantages of steel castings is the flexibility of design. Designers have great freedom to design and choose the shape and size of castings. Especially for parts with complex shapes and hollow sections, steel castings can be manufactured by the unique process of core assembly. Its formation and shape change are very easy, and the conversion speed from the drawing to the finished product is very fast, which is conducive to rapid quotation response and shorten the delivery time. The perfect design of shape and quality, small stress concentration coefficient and strong overall structure all reflect the flexibility and technological advantages of steel casting design:
1. The metallurgical manufacturing of steel castings has strong adaptability and variability, and different chemical composition and organization control can be selected to meet the requirements of various projects; The mechanical properties and service properties can be selected in a large range through different heat treatment processes, with good welding properties and processing properties.
2. The isotropy of steel casting materials and the overall structural strength of steel castings improve the engineering reliability. Combined with the advantages of weight reduction design and short delivery time, it has competitive advantages in price and economy.
3. The weight of steel castings can vary in a large range. Those with small weight can be investment castings of only tens of grams, while large steel castings can weigh several tons, tens of tons or even hundreds of tons.
Product application
Due to the characteristics of steel castings, almost all industrial departments need to use steel castings, which are particularly widely used in ships and vehicles, construction machinery, engineering machinery, power station equipment, mining machinery and metallurgical equipment, aviation and aerospace equipment, oil wells and chemical equipment. As for the application of steel castings in various industrial sectors, due to the specific conditions of different countries, the situation may vary greatly.
There are many kinds of steel castings. This paper briefly describes the use of steel castings in several major industrial sectors.
1. Power station equipment
Power plant equipment is a high-tech product, and its main parts operate continuously for a long time under high load. Many parts of thermal power plant and nuclear power plant equipment also need to withstand the corrosion of high temperature and high pressure steam, so there are strict requirements for the reliability of parts. Steel castings can meet these requirements to a large extent and are widely used in power plant equipment.
2. Railway locomotives and rolling stock
Railway transportation is closely related to the safety of people's lives and property. It is essential to ensure safety. Some key components of rolling stock, such as wheels, side frames, bolster and coupler, are traditional steel castings.
The switch used for railway switch is a component that bears strong impact and friction. The working conditions are extremely bad and the shape is very complex.
3. Construction, construction machinery and other vehicles
The working conditions of construction machinery and construction machinery are very poor. Most parts bear high loads or need to withstand impact wear. A large part of them are steel castings, such as driving wheels, bearing wheels, rocker arms, track shoes, etc. in the action system.
Steel castings are rarely used in general cars, but many steel castings are also used in the action parts of special off-road vehicles and heavy trucks.