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Comparison Of Casting And Stainless Steel Forgings
Aug 24, 2017

Comparison of Casting and Stainless Steel Forgings
    For Casting we do not feel strange, Casting applications have a long history. In ancient times, people used cast to do coins, weapons, tools and some living utensils. However, in modern times, Castings are mainly used for rough parts of machine parts or directly used as machine parts. Machinery products in the Casting began to account for more and more, the amount is increasing year by year, the shape of the cast, the variety is also constantly changing. Casting has gradually become an indispensable part of our daily life, all kinds of door handles, door locks, small water pipes and other occasions can see the use of Castings.
    Casting has excellent mechanical and physical properties, it can have a variety of different strength, hardness, toughness with the comprehensive performance, but also both one or more special properties, such as wear, high temperature and low temperature, corrosion resistance The
Casting the weight and size range is very wide, the only light weight of only a few grams, the most important can reach 400 tons, the wall thickness of the thinnest only 0.5 mm, the thickest can be more than 1 meter, the length can be a few millimeters to ten meters, To meet the requirements of different industrial sectors.
    Compare the difference between Castings and stainless steel forgings:
    1. Casting has good wear resistance and shock absorption function, because the cast iron graphite is conducive to lubrication and oil storage, so good wear resistance. Similarly, due to the presence of graphite, gray cast iron shock resistance is better than steel.
    2. Casting process performance is good, because the gray cast iron with high carbon content, close to the eutectic composition, so the melting point is relatively low, good fluidity, shrinkage is small, so suitable for Casting complex or thin-walled Castings.In addition, So that the cutting process is easy to form chip breaking, so gray cast iron cutting workability is better than steel.
    3. Stainless steel after forging processing can improve its organizational structure and mechanical properties. Casting tissue after forging process thermal deformation due to the deformation and recrystallization of stainless steel, the original coarse dendrites and columnar grains into fine grain size, uniform size of the equiaxed recrystallization structure, so that the original ingot segregation, Loose, porosity, slag and other compaction and welding, the organization has become more closely, to improve the plasticity and mechanical properties of the metal.
    4. The mechanical properties of the Castings are lower than those of the same material. However, forging processing to ensure the continuity of metal fiber organization, so that forging the fibrous tissue and forging shape consistent, to ensure that the parts have good mechanical properties and long service life using precision die forging, cold extrusion, temperature extrusion process Production of forgings, are cast can not match.
    Whether it is cast or stainless steel forgings, are an indispensable part of mechanical production, in the machinery production, according to the different product performance, select the appropriate Castings or forgings, and only give full play to the role of Casting or forging in order to have the perfect mechanical products The
Although China's large-scale Casting industry has made remarkable achievements, but some high-end core technology has not yet fully grasp, some key components and raw materials also rely on imports, domestic development and application performance research work is still relatively weak, some high-end products have not yet achieved localization The To sum up, in the overall product quality, production and technical level, compared with foreign advanced industrial countries there is still a certain gap.
China's large cast products are mainly used in power plants, ships, large machinery, metallurgy and petrochemical industries. In these industries, for the power plant equipment Casting the highest technical barriers, marine, followed by large machinery.