Application

Grade Service Properties Applications
301 Lower Chrome and Nickel content increases the work hardening rate to give high strength and abrasion resistance. Particularly suitable for components requiring stretch forming, high strength or good spring properties. Springs, pressings, connectors, chemically etched components.
304 The most popular grade in the austenitic (300) series, exhibiting good corrosion resistance and formability. AISI 304 can be used in the welded condition in mild environments; however AISI 304L should be used in more corrosive conditions. Flexible tube, expanded metal, fabrications, decorative trim, pressings, springs.
304L Reduced Carbon content for better corrosion resistance in welded structures than the base grade AISI 304. Water tube, bellows, pressings.
305 Nickel content is increased compared with the base grade AISI 304 to lower the work hardening rate. Preferred for deep drawing or spinning operations. Pen caps and bodies, deep drawn components generally.
316 Molybdenum is added to increase the corrosion resistance when compared with the base grade AISI 304. Bursting discs, seals, bellows, gaskets, expansion joints, explosion panels, tubes, diaphragms and components in chemical, petrochemical and marine applications.
316L Reduced Carbon content for better welded corrosion resistance than AISI 316 Bursting discs, seals, bellows, gaskets, expansion joints, explosion panels, tubes, diaphragms and components in chemical, petrochemical and marine applications.
320 A 'stabilized' version of AISI 316, the addition of Titanium improves the corrosion resistance of welds by preventing the formation of chromium carbides. Application is usually found in welded fabrications needing excellent corrosion resistance.
321 Titanium is added to oppose chromium carbide precipitation and remove the risk of deteriorating corrosion performance in welded structures as may occur in the base grade AISI 304. Expansion joints, seals, bellows, gaskets, honeycomb seals, thermal insulation, tube and bellows. The use of estabilized grades is favored by the aerospace industry, particularly in engine related applications.
347 Niobium is added to oppose chromium carbide precipitation in the same way as Titanium is used in the alloy 321 above. As above, where elevated operating temperatures may otherwise encourage the formation of chromium carbides.
430 Lower Chrome and the absence of Nickel result in a lower work hardening rate than austenitic grades resulting in a lower breaking strength especially when fully cold rolled. Most often used in the annealed (soft) condition this grade has good formability and a moderate corrosion resistance. Unlike the austenitic grades the ferritic steels respond strongly to a magnet. When cold rolled and annealed the surface finish is reflective. It is significantly lower cost than the austenitic grades. Can only be hardened by cold work. Automotive and domestic appliance trim, domestic sinks, domestic washer drums and pressings generally.
410 This grade of stainless steel can be hardened by heat treatment and therefore has a wide range of mechanical properties. It has low resistance to corrosion when compared with austenitic grades, but this is balanced by a low cost. This grade strongly responds to a magnetic field. Springs and pressings.
420 Properties very similar to those of 1.4006, this grade, with increased Carbon content, has improved potential hardness and wear / abrasion resistance. Springs, knives and cutting edges generally, doctor blades and similar printing industry wear and scraping applications.
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