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Matters needing attention during machining of stainless steel

Source: Jiangsu Sturway New Materials  Time:2020-03-17

  Processing area: The processing area of stainless steel parts should be relatively fixed. Protective measures should be taken for platforms in the processing area, such as laying rubber mats. When processing stainless steel parts, damage to the surface protective layer of stainless steel parts should be avoided.

  Chloride in the environment

  Chloride ions are widely present, such as salt / sweat / seawater / sea breeze / soil and so on. Corrosion of stainless steel in the presence of chloride ions is fast and even exceeds that of ordinary low carbon steel. Therefore, there are requirements for the use environment of stainless steel, and it is necessary to wipe frequently to remove dust and keep it clean and dry. (In this way, he can be given an "improper use.") There is an example in the United States: An enterprise uses an oak container to hold a solution containing chloride ions. The container has been used for more than 100 years. It was planned to be replaced in the 1990s Because the oak material is not modern enough, the container leaked due to corrosion 16 days after the stainless steel was replaced.

  Without solution treatment

  The alloy elements are not dissolved in the matrix, resulting in a low alloy content in the matrix structure and poor corrosion resistance.

  Natural intergranular corrosion

  This titanium and niobium-free material has a tendency to intergranular corrosion. Adding titanium and niobium together with stable treatment can reduce intergranular corrosion. A high-alloy steel that can resist corrosion in air or chemically corrosive media. Stainless steel has a beautiful surface and good corrosion resistance.

  It does not need to undergo surface treatment such as color plating, but uses the inherent surface properties of stainless steel. An aspect of steel, often called stainless steel. Representative properties are 13 chromium steel, 18-8 chromium nickel steel and other high alloy steel. From the perspective of metallographic analysis, because the stainless steel contains chromium, a thin chromium film is formed on the surface.

  This film is isolated from the invading oxygen in the steel and has a corrosion resistance. In order to maintain the inherent corrosion resistance of stainless steel, steel must contain more than 12% chromium. For applications where welding is required, the lower carbon content minimizes the precipitation of carbides in the heat-affected zone near the weld, and the precipitation of carbides may cause intergranular corrosion of stainless steel in certain environments.

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