Grade | Type | Composition | Properties | Common Applications |
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304 | Austenitic | 18% Cr, 8% Ni | Excellent corrosion resistance, general-purpose use | Kitchen equipment, tanks, pipes, architectural paneling |
304L | Austenitic | 18% Cr, 8% Ni, Low C | Improved weldability over 304, reduced carbon for corrosion resistance | Chemical containers, heat exchangers, food industry |
304H | Austenitic | 18% Cr, 8% Ni, High C | Higher strength at elevated temperatures | Boilers, heat exchangers, oil refineries |
316 | Austenitic | 16% Cr, 10% Ni, 2% Mo | Superior resistance to chlorides and acidic environments | Marine, chemical processing, surgical instruments |
316L | Austenitic | 16% Cr, 10% Ni, 2% Mo, Low C | Better weldability and resistance to corrosion in high heat | Pharmaceutical, marine, food processing |
316H | Austenitic | 16% Cr, 10% Ni, 2% Mo, High C | High strength and resistance at elevated temperatures | Petrochemical, furnace parts, heat exchangers |
303 | Austenitic | 17% Cr, 8% Ni, Added S | Easy machinability, good corrosion resistance | Fasteners, gears, shafts, fittings |
309 | Austenitic | 23% Cr, 13% Ni | Heat resistance, oxidation resistance | Furnace parts, boiler baffles, heat exchangers |
309S | Austenitic | 23% Cr, 13% Ni, Low C | Improved weldability and ductility over 309 | High-temperature applications, heat treatment equipment |
309H | Austenitic | 23% Cr, 13% Ni, High C | High strength at elevated temperatures | Furnace components, chemical processing equipment |
310 | Austenitic | 25% Cr, 20% Ni | Excellent resistance to oxidation and high temperatures | Furnace parts, heat exchangers, kiln liners |
310H | Austenitic | 25% Cr, 20% Ni, High C | Maintains high strength and corrosion resistance at high temperatures | Heat treatment equipment, chemical plants |
310S | Austenitic | 25% Cr, 20% Ni, Low C | Improved weldability and formability | Furnace parts, exhaust systems, high-temperature applications |
317 | Austenitic | 18% Cr, 11% Ni, 3.5% Mo | High resistance to sulfuric acid and other chemicals | Chemical and petrochemical processing, food industry |
317L | Austenitic | 18% Cr, 11% Ni, 3.5% Mo, Low C | Better weldability and resistance to corrosion under stress | Chemical processing, marine, oil and gas applications |
317LMN | Austenitic | 18% Cr, 11% Ni, 3.5% Mo, N added | Higher resistance to corrosion and pitting | Highly corrosive environments, offshore, pharmaceutical |
321 | Austenitic | 17% Cr, 9% Ni, Ti stabilized | Good resistance to intergranular corrosion, used in high temperatures | Aerospace, thermal oxidizers, exhaust manifolds |
321H | Austenitic | 17% Cr, 9% Ni, Ti stabilized, High C | Higher strength and resistance at elevated temperatures | Chemical processing, refinery piping, heat exchangers |
347 | Austenitic | 17% Cr, 9% Ni, Nb stabilized | Excellent resistance to intergranular corrosion | Aircraft exhausts, refinery equipment, high-temperature applications |
347H | Austenitic | 17% Cr, 9% Ni, Nb stabilized, High C | High strength in high-temperature applications | Boilers, high-pressure vessels, chemical processing |