Office Chair 304 Material
Office chairs made of 304 material are crafted using austenitic stainless steel with the grade number 304 as the core material, known for their corrosion resistance and ease of maintenance. Here is a detailed introduction:
Composition and Corrosion Resistance: 304 stainless steel contains approximately 8% to 10.5% nickel and about 18% to 20% chromium. A dense chromium oxide passivation film naturally forms on its surface, exhibiting extremely high chemical stability. This film effectively blocks the contact between oxygen atoms and the internal iron matrix, preventing electrochemical corrosion reactions. Therefore, its weather resistance does not rely on external protections such as paint or coatings. However, in coastal environments with high chloride ion concentrations, pitting corrosion may still occur if there are areas of concentrated processing stress on the surface, with a pitting rate of approximately 0.1 mm to 0.3 mm per year.
Manufacturing Process: Typically, a combination of tube bending and welding with sheet metal stamping is used. Tubes are used to form the support frame of the chair, with wall thicknesses generally ranging from 1.2 mm to 2.0 mm. Sheet metal is used for the seat and backrest, stamped in one go using molds to create an arc that conforms to the human sitting posture. Argon arc welding is commonly used for connections, followed by pickling and passivation treatments to restore the passivation film in the weld area. Fasteners are mostly stainless steel bolts of the same material to avoid galvanic corrosion caused by contact between different metals.
Surface Treatment: Usually, brushing or matte finishing is applied. The brushing process can conceal minor scratches and reduce surface light reflection, while matte finishing provides a finer feel and appearance without issues of aging or peeling.
Maintenance Characteristics: Cleaning requires only neutral detergents and soft cloths, with no need for waxing or applying protective agents. The surface passivation film has self-repairing capabilities.
Market Situation: Brands of 304 stainless steel office chairs on the market include Beiwei, Dongrui, Binjiang Kaiyue, etc. Prices for some products from the Beiwei brand, for example, are 680.00 yuan per set or 680.00 yuan per piece.
