The generally accepted maximum service temperatures for grade 304 stainless steel in air are 870☌ for intermittent service and 925☌ for continuous service. The standard allows the use of higher design stresses at all temperatures for 304H.
Pressure VesselsĪS1210, Pressure Vessels, allows the use of grade 304 up to a temperature of 800☌. ToughnessĪustenitic stainless steels are inherently tough, maintaining the ductile fracture mode and high absorbed energy in impact tests to cryogenic temperatures (-200☌). Stress corrosion cracking should be considered for all corrosion services where the corrosive liquid may contain chloride. Grade 304 may suffer stress corrosion cracking in solutions containing chloride ions at temperatures over about 60☌. Grade 304 stainless steel is not generally used in seawater, due to the probability of crevice corrosion developing under sediments, precipitation and biofouling. Pitting and crevice corrosion may occur at higher chloride content, and 200 ppm is accepted as the upper limit. It has given excellent service in some situations in potable water. Best appearance is maintained where the design allows even rain washing of the surface, or where dirt deposits are occasionally washed off the steel. Austral Wright Metals will be pleased to provide advice for specific applications.ģ04 stainless steel gives good service in atmospheric conditions, resisting most environments except for marine conditions, or where industrial pollution is heavy. Grade 304 stainless steel has excellent corrosion resistance in many environments. Contact us today for a quote!īrewing and dairy equipment, evaporators, drums, barrels, heat exchangers, hospital equipment, refrigeration parts, chemical and food processing, shop fittings, bench tops, kitchens, kitchen utensils, sinks, wash troughs, urinals, hand rails, dishwashers, clothes dryers, ovens, heating trays, air conditioning equipment, guttering and rain water goods, counters and display cabinets, hot and cold food bars, commercial oven hoods, beer barrels. Table of ContentsĪustral Wright Metals can supply 304 stainless steel as plate, coil, sheet, strip, round, hexagon, flat bar, angles, tube, pipe and welding consumables. The version with guaranteed high carbon, 304H stainless steel, may be required for elevated temperature service, such as pressure vessels.
304 STAINLESS COMPOSITION FULL
The low carbon version, 304L stainless steel, may be required for full corrosion resistance when sections thicker than about 6mm are welded. The ease of cleaning and of maintaining a hygienic surface on the steel make it excellent for many purposes. In most applications, 304 stainless steel is used where its corrosion resistance gives long-lasting appearance and service life. The very tough and ductile austenitic structure gives grade 304 excellent formability and fabrication characteristics. It is austenitic in structure because of the 8% nickel it contains. Grade 304 stainless steel contains 18% chromium, which makes it resistant to many corrosive environments. The 304H version has a guaranteed minimum carbon content, which ensures good strength at high temperatures. The low carbon version, 304L, may be required for full corrosion resistance when thicker sections are welded. It is an austenitic, corrosion-resistant steel with excellent strength, toughness, fabrication characteristics and weldability.
Grade 304 is the most commonly used stainless steel.
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