Stainless Steel Stainless Steel Fasteners（不锈钢不锈钢紧固件）.pdf

Product Specifications ASPEN FASTENERS Stainless Steel Tel.: 1-800-479-0056 Fax: 1-888-411-2841 aspeninfo@ Stainless Steel Stainless Steel Fasteners Chemical, Physical and Mechanical Properties Stainless steel describes a family of steels highly resistant to tarnishing and rusting that contain at least two separate elements alloyed together. In its most basic form, chromium is added to ordinary steel in order to become corrosion resistant. The mechanical properties of stainless steel (eg strength, ductility), and how well the alloy withstands corrosion depends entirely on which elements were alloyed together and their relative proportions. Corrosion Resistance The corrosion resistance of stainless steel is derived from chromium. Chromium has a strong affinity for oxygen and when added to steel in sufficient quantity (minimum 11%), it will form a microscopic film of chromium oxide on the surface of the alloy. The film is only about 0.01 microns thick but prevents further surface corrosion as well as any corrosion from spreading into the metals internal structure. This chromium oxide film is non reactive with other materials and does not promote further oxidation of adjacent chromium. It is also bonded solidly to the surface of the alloy and in the event of surface damage (eg scratching), the newly exposed chromium will react immediately with oxygen in the air to renew the protective chromium oxide film. Besides chromium, another important element often added to