A.I.S.I.
U.N.S.

Characteristics

End-Use

301
S30100

Able to attain tempers from 1⁄4 through full hard, extra full hard by cold rolling.
Withstands severe forming in annealed
condition.

Kitchen sinks, Automotive wheel
covers. Toaster springs, Seat belt
buckles

303
S30300

Highest machinability rating among the 300 series. Forming and welding are not recommended.

Nuts and bolts, threaded rods,
Fittings.

304
S30400

Excellent corrosion resistance and suitable for deep drawing applications when Nickel content is increased. Carbon content .08% max.

Food Industry, Chemical Industry,
Deep drawing applications, Aesthetic
application.

304L
S30403

Same characteristics as 304 with a lower carbon content .03% max. Used when post weld annealing is impossible. The lower carbon content reduces carbide precipitation in the welded zone.

Large fabricated equipment.

316
S31600

Molybdenum bearing alloy with better
overall corrosion resistance than 304 and higher creep strength at elevated temperatures.

Marine coastal environments, Pulp
and paper industry, Chemical and
petrochemical Industry

316L
S31603

Same characteristics as 316 with a lower Carbon content .03 max. Good corrosion resistance in high temperature intermittent service. Used when post weld annealing is impossible. The lower carbon content reduces Carbide precipitation in the welded zone.

Large fabricated equipment.

317L
S31703

Higher Molybdenum content than 316 for better corrosion resistance. Carbon content .03% max.

Corrosive environments. Chemical
and petrochemical industries.

309
S30900
309S
S30908

Heat resisting alloy with good corrosion resistance. High tensile and creep strengths as well as at elevated temperatures. 309S has a lower Carbon content.03 max.

Furnace parts, Baffles, Cement kiln
chains. Exhaust manifold butterfly
valves.

310
S31000
310S
S31008

Improved characteristics over 309 and
better scaling resistance in intermittent
elevated temperatures. Grade 310 has a low co-efficient of expansion.

Furnace parts, Carburizing boxes,
Heat exchangers, Oil burner parts.