The reason 304 stainless steel rust phenomenon occurs

304 stainless steel wire 304 reasons appear rusting stainless steel rusting occurs, there may be several reasons:
1. Chloride
Widespread presence of chloride ions, such as sodium chloride / sweat / sea / sea / soil, and so on. Stainless steel in the presence of chloride ions in the environment, corrosion and soon, even more than the ordinary low carbon steel. Therefore, the use of stainless steel environment requirements, and require frequent cleaning to remove dust, clean and dry. (So that you can give him set a "misuse.") The United States is an example: a company with an oak containers with a solution of chlorine ions, the container has been used hundreds of years, plans to replace the nineties due to lack of modern oak material, the use of stainless steel replacement 16 days after container leak due to corrosion.
2. Solution treatment
No alloying elements dissolved in the matrix, resulting in tissue matrix alloy content is low, poor corrosion resistance.
3. intergranular corrosion
This material does not contain titanium and niobium have a tendency to intergranular corrosion. Adding titanium and niobium, which together with the stabilization process can reduce intergranular corrosion. In the air or chemical corrosion medium can resist a high-alloy steel, stainless steel is a beautiful surface and good corrosion resistance, without going through the plated surface treatment, play inherent in the surface properties of stainless steel, for use in multi-an aspect of the steel, commonly referred to as stainless steel. Representative of the performance of 13 chrome steel, chrome-nickel steel alloy 18-8. From the metallographic point of view, because the stainless steel contains chromium chromium film formed on the surface leaving a thin, the membrane separating oxygen from invading the inner steel corrosion effect. In order to maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 12% chromium. The need for welding applications. Lower carbon content makes it close to the weld heat affected zone to minimize carbide precipitation, and carbide precipitation may lead to intergranular corrosion of stainless steel in some environments (welding erosion).
4. appearances
Refers to the phenomenon of surface marks 304 stainless steel deep processing or processed products after grinding, wire-bound pit marks or dot defects in the product surface.
The reason: the surface, the mold surface of a foreign body, blank pad surface scars.
Solution: Before processing to remove the foreign body, the scars can also be removed by thoroughly grinding and orange peel.
Orange peel refers to the molded article 304 in the polishing or other cases, the surface of the same shape as the orange peel phenomenon.
Cause: The grinding is not sufficient, the more severe the greater processing orange peel, raw coarse grains, heat softened.
Solution: deep processing products are fully ground, select the appropriate heat treatment conditions, controlling the grain size of raw materials.