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Precision cast stainless steel thermal treatment technology
1, Martensite iron stainless steel: This type of stainless steel body center cubic structure can attract the magnet, will be from the Ostian temperature and cold, corrosion resistance is good, but the material is hard and brittle, then temper can increase the ductility, but corrosion resistance will be reduced, especially between 450 degrees Celsius and 650 degrees Celsius temper, Special attention should be paid to chromium carbide, which can be diffused out from carbon atoms in the crystal lattice gap and form a network of chromium, resulting in the consumption of chromium elements in the adjacent area and the reduction of chromium composition, which can not form a protective film and loss of corrosion resistance.
2, Fertilizer iron stainless steel: precision casting manufacturers introduce this kind of stainless steel body center cubic structure, can attract the magnet is usually used in the automobile industry or chemical industry, strength will not change because of heat treatment, but can increase the strength of cold processing. Ostin iron stainless steel: This type of stainless steel face center cubic structure, does not work on the magnet, as mentioned before this kind of material is easy to process, so its processing can eliminate the residual stress of the material and can be applied to different heat treatment.
3, Precipitation hardening type stainless steel: this stainless steel by high temperature quenching after low temperature heat treatment, due to the material containing aluminum, or copper element precipitation along the sliding surface or grain boundary formation compound, and can improve its strength or hardness. Commonly used precipitate hardening stainless steel 17-4PH, other 17-7PH, PH15-7MO, AM-350, AM-355 and so on.
4, All kinds of stainless steel after welding heat treatment: Chromium stainless steel contained within the element, after welding, spread in the high temperature area tend to precipitate with carbon chromium carbide, chromium and cause of the local ingredients, can't form a protective film, and perforation of the corrosion situation often happen in the heat affected zone, can remedy the situation are often after welding, will object to heat treatment, Its action can make other areas of chromium element diffusion to the lack of chromium area, to achieve protection.
