Forging manufacturers: what are the characteristics of heat treatment of stainless steel forgings?
Heat treatment of steel is a process method to change the internal structure of steel by heating, holding and cooling to obtain the required properties. Heat treatment can give full play to the potential of steel materials, improve the performance of forgings, reduce the quality of forgings, save materials, reduce costs and extend the service life of forgings. It is an important process to strengthen the steel, improve the quality of processing, improve the processing performance of forgings and reduce tool wear. Therefore, forging manufacturers means that important machine forgings need to be heat-treated during the manufacturing process.
Heat treatment of stainless steel forgings is the same as ordinary heat treatment to improve its process performance, mechanical properties and physical properties, reduce the residual stress of stainless steel forgings in the processing process, so as to obtain better performance of stainless steel use, so that stainless steel in the hot and cold state can be better processing.
Stainless steel is a special steel, its heat treatment is different from ordinary carbon steel.
1. stainless steel in the chromium and nickel content is high, chromium and nickel is difficult to diffuse in the steel. The general heating temperature is high and the heating time is long.
2. Stainless steel is prone to carburization at high temperatures, forming carbides that damage its corrosion resistance. Therefore, the heating should be strictly controlled furnace atmosphere to prevent carburization, decarburization and peroxide during heating. Forgings should be clean when heated, and no grease should be attached.
3. Stainless steel forgings at low temperatures, low thermal conductivity, poor temperature uniformity, the need for slow heating to prevent excessive thermal stress to produce cracks.
4. Avoid scratching the surface of stainless steel forgings to prevent oxidation and deformation during the heat treatment process.
Forging manufacturers said to stainless and corrosion resistance as the main feature, chromium content of 10.5% or more, martensitic organization as the matrix, magnetic and mechanical properties through heat treatment adjustable stainless steel called martensitic stainless steel. Martensitic stainless steel mainly has Crl3 and Crl7 two types. Stainless steel forgings normalized after quenching the microstructure of martensite. The normalising organisation of semi-martensitic stainless steel is martensite + ferrite, and the quenching organisation can be martensite or martensite + austenite according to its composition and quenching temperature. They can all be strengthened by heat treatment.
Forging manufacturers say that from the point of view of safety technology and labour protection, the characteristics of the forging workshop are.
(1) Forging production is carried out in the hot state of the metal (e.g. the forging temperature range for mild steel is 750-1250). Due to the large amount of physical work, the slightest carelessness may result in burns.
(2) Forging manufacturers say that the forging equipment works with great force, and the heating furnace and hot ingots, billets and forgings continuously release a large amount of radiant heat (forgings are still quite hot at the end of forging), so workers are often injured by radiant heat. Therefore, care must be taken in operation.
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