Iron class (1) martensitic stainless steel, the structure of the stainless steel body centered cubic (BCC) can be magnet attracted, from the Austin field temperature quenching and, the corrosion resistance of the best, but the material hard, brittle, and then try to temper can increase the ductility, but the corrosion resistance decreases, especially in the tempering between 450 degrees to 650 degrees Celsius, can make the gaps in a crystal lattice of carbon atoms diffusion and chromium form mesh of chromium carbide precipitation causes regional consumption reduce chromium composition of chromium element, can't form a protective film, and loss of corrosion resistance, precision casting processing factory remind everybody so special attention should be paid. The following is the heat treatment temperature of various matian stainless steel products.

403410416 (a) the temperature of se in 650-750 ℃.

(b) the temperature of 414 in 414-650 ℃.

(c) the temperature of 431 in 6. (d), 440 - A, 440 - B, 440 - c, the temperature of 420 in 680-750 ℃.

    (2) fe-iron stainless steel: this kind of stainless steel body and core cubic structure (BCC) can attract the magnet is usually used in the automotive industry or chemical industry, the strength will not change due to heat treatment, but can be cold processing to increase the strength.

(3) austenitic stainless steel: this kind of stainless steel face and center cubic structure (FCC) has no effect on the magnet, as mentioned above, this kind of material is easy to process, so it can be processed to eliminate the residual stress of the material and can be subjected to different heat treatment.

(4) precipitation of hardening stainless steel: this kind of stainless steel by high temperature quenching in low temperature heat treatment, due to the precipitation of aluminum, or copper elements in the material along the slip surface or grain boundary compounds (inter-metalliccompounds) and can improve its strength or hardness. Commonly used precipitated hardening stainless steel 17-4ph, other 17-7ph, ph15-7mo, am-350, am-355, etc.

(5) all kinds of stainless steel after welding heat treatment: stainless steel contained within the element chromium, after welding, the high temperature zone (haz) tend to spread out and combined into 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 the other area of spread to the area of chromium lack chromium element, in order to achieve protection.