Stainless Steel

Guide To Selection


203 EZ (S20300). Superior machining austenitic stainless designed specifically for high speed automatic machine operations. Faster speeds, better finish, longer tool life when compared to 303. Same corrosion resistance.

303 (S30300). Free machining variation of T302/304 for use in automatic machining operations. Corrosion resistant to atmospheric exposures, sterilizing solutions, most organic and many inorganic chemicals, most dyes, nitric acid and foods.

304 (S30400). The most widely used of the stainless and heat resisting steels. Offers good corrosion resistance to many chemical corrodents as well as industrial atmospheres. Has very good formability and can be readily welded by all common methods. 304 Prodec offers improved machinability.

304L (S30403). Extra low carbon variation of T304 avoids harmful carbide precipitation due to welding. Same corrosion resistance as T304. Slightly lower mechanical properties than T304. 304L Prodec offers improved machinability.

309/309S (S30900, S30908). Used in high temperature applications. High scale resistance. Corrosion resistance superior to 304. Excellent in resisting sulfite liquors, nitric acid, nitric-sulfuric mixtures, acetic, citric and lactic acids. 309S (.08 max. carbon) resists corrosion in welded parts.

310/310S (S31000, S31008). Higher alloy content improves the characteristics of 309. Corrosion resistance better than 304. Excellent oxidation resistance. 31 OS (.08 max. carbon) offers improved corrosion resistance in welded components.

316 (S31600). Better corrosion and pitting resistance as well as higher strength at elevated temperatures than T304. Used for pumps, valves, textile and chemical equipment, pulp & paper and marine applications. 316 Prodec offers improved machinability.

316L (S31603). Extra low carbon variation of T316 to avoid carbide precipitation due to welding. Same excellent corrosion resistance of T316. 316L Prodec offers improved machinability.

317L (S31703). Moly bearing austenitic steel with alloy content somewhat higher than 316. This chemistry gives 317L superior corrosion resistance in difficult environments, as well as higher creep, stress-torupture and tensile strengths at elevated temperatures. Applications include FGD scrubbers, chemical and petrochemical processing equipment and pulp and paper equipment.

254 SMO (UNS S31254) is an austenitic specialty stainless steel designed for maximum resistance to pitting and crevice corrosion, With high levels of chromium, molybdenum and nitrogen, 254 SMO is especially suited for high chloride environments such as brackish water, seawater, pulp mill bleach plants and other high chloride process streams.

321 (S32100). Stabilized with titanium for weldments subject to severe corrosion. No carbide precipitation. Excellent resistance to a variety of corrosive media. Immune to most organic chemicals, dyestuffs and many inorganic chemicals.

Nitronic® 30. A nitrogen-strengthened stainless developed for applications requiring a good level of aqueous corrosion resistance combined with good resistance to abrasive and metal-to-metal wear. Applications include conveyors, hoppers, chutes, mixing equipment, screens, wear plates — anywhere there is wet sliding abrasion.

Nitronic® 50 (S20910) (Formerly 22-13-5). A nitrogen-strengthened austenitic stainless that provides a combination of corrosion resistance and strength. Corrosion resistance greater than that of T316 and T316L plus approximately twice the yield strength. Very good mechanical properties at both elevated and subzero temperatures.

Nitronic® 60 (S21800). Excellent galling resistance, corrosion resistance comparable to T304 plus approximately twice the yield-strength. Metal-to-metal abrasive wear resistance is also good.


410 (S41000). Heat-treatable stainless used widely where corrosion is not severe — air, fresh water, some chemicals and food acids. Typical uses include valve & pump parts, fasteners, cutlery, turbine parts, bushings.

410 DOUBLE TEMPERED (S41000). Quenched and double tempered variation of T410 conforming to NACE MR-01-75API 6A Type III. For parts used in hydrogen sulfide (H2S) service.

416 (S41600). Free-machining variation of T410 with useful corrosion resistance to natural food acids, basic salts, water and most atmospheres.

422 (S42200). A martensitic stainless steel designed for service temperatures up to 1200° F with a good combination of high strength and toughness. It is used in steam turbines as blading and bolting material.

440 C (S44004). A high carbon (.95/1.20%C) chromium steel that can attain the highest hardness (Rockwell C60) of any standard stainless grade. In the hardened and stress relieved condition, 440 C has maximum hardness together with high strength and corrosion resistance. Also has good abrasion resistance. 440 A is lower carbon variety (.60/.75%C) which results in lower hardness but greater toughness in the hardened condition.


409 (S40900). Lowest cost stainless — used extensively in automotive exhaust systems. Because of its combination of economy and good resistance to oxidation and corrosion, it creates opportunities to economically improve the performance of a wide range of parts where surface appearance is not important.

430 (S43000). Is the most popular of the non-hardenable chromium stainless steels. It combines good corrosion and heat resistance with good mechanical properties. Oxidation resistance to 1500° F widely used in both industrial and consumer products.


17-4/Type 630 (817400). A precipitation hardening grade combining high strength and hardness with corrosion resistance similar to T304 in most media. Simple low temperature heat treatment at 900/1150° F eliminates scaling and prevents excessive warpage.

17-4 DOUBLE AGED H1150 (S17400). Solution annealed then double age hardened to procedure #1 in NACE MR 01-75. Used in many pressure control applications in the energy market.

15-5 (S15500). A vacuum arc remelted grade which offers high strength and hardness. Excellent corrosion resistance plus excellent transverse toughness.


#1 Hot rolled, annealed and pickled
#2D Annealed, pickled and dull cold rolled
#2B Annealed, pickled and bright cold rolled
#3 Intermediate polish (approximately 100/120 grit)
#4 Standard polish (approximately 150/180 grit)
BA (Bright annealed) bright cold rolled and controlled atmosphere annealed to retain highly reflective finish.
#8 Mirror finish

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