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Stainless steel is notable for its corrosion resistance, and it is widely used for food handling and cutlery among many other applications. Stainless steel does not readily corrode, rust or stain with water as ordinary steel does. However, it is not fully stain-proof in low-oxygen, or high-salinity environments. There are various grades and surface finishes of stainless steel to suit the environment the alloy must endure.
Stainless steel is used where both the properties of steel and corrosion resistance are required. Its resistance to corrosion and staining, low maintenance, and familiar lustre make it an ideal material for many applications.
Type 304 (UNS S30400) is the most widely used of the austenitic chromium-nickel stainless steels.Its carbon content is lower and its corrosion resistance somewhat higher than Type 302. In the annealed condition, Type 304 is essentially nonmagnetic and becomes slightly magnetic when cold worked. In the lower carbon Type 304L material, carbide precipitation as a result of welding will be minimized, resulting in less susceptibility to intergranular corrosion.
430 STAINLESS STEEL
Type 430 is ductile, has good forming characteristic and is readily fabricated by such operations as bending, pressing, drawing and heading. Its tendency to work harden is much less than that of the nickel-bearing 300 series stainless steel. Type 430 does not have as good corrosion resisting properties as the chromium nickel steels. However, it is suitable for interior architectural and decorative household appliances trim as well as automotive body molding. Cold rolled Type 430 has an attractive bright finish which can be maintained with reasonable care and periodic cleaning. Type 430 is by far the most popular of all straight chromium stainless steels. It is the general purpose alloy of the ferritic class. This type contains approximately 17 percent chromium and is often referred as 17 chrome stainless. The higher chromium content imparts improved resistance of Type 430 is slightly less than carbon steel, but its thermal conductivity is one half that of carbon steel. Chromium stainless steel is magnetic.
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