Alloys

Stainless Steel Alloys

300 Series Stainless

CWI Stainless Steel 302S [ UNS: S30200 / Euro: 1.4310 ] (17%-19% chromium / 8%-10% nickel austenitic alloy ) is tougher, ductile grade with comparable corrosion resistance is non-magnetic, and does not harden by heat treatment. Typical uses include:

  • Stamping
  • Spinning
  • Wire forming
  • Formed into all types of washers, springs, screens, and cables
  • Food and beverage industry
  • Pressure containing applications
  • Sanitary or cryogenic applications

CWI 302HQ [ UNS: S30430 / Euro:1.4567 ] is designed for severe cold heading applications. The addition of copper reduces cold work hardening of this type of stainless steel.

UNS S30430 – Cr: 17.0-19.0%, Ni: 8.0-10.0%, Cu: 3.0-4.0% per ASTM A493

CWI Series Stainless 303 is a non-magnetic stainless steel that is not hardenable by heat treatment.

UNS 30300 – Cr: 17.00-19.00% Ni: 8.00-10.00% with full chemistry to ASTM A581

CWI 304 [ UNS: S30400 / EURO: 1.4301 ] is a basic, austenitic stainless steel containing a minimum of 18% chromium and 8% nickel. This material meets the chemistry of the ASTM A580 specification.

CWI Series Stainless 304L (UNS S30403) is a low carbon variation of Type 304 with a 0.03% maximum carbon content. This material meets the chemistry of the ASTM A580 specification.

CWI Series Stainless 304VM is a basic austenitic stainless steel with an improved cleanliness level due to vacuum melting process. Type 304VM is typically used for various medical applications.

CWI Series Stainless 305 is an austenitic stainless steel that is well suited for cold forming operations due to its low work hardening rate.

UNS S30500 – Cr: 17.0-19.0% and Ni: 10.0-13.0% with full chemistry to ASTM A580

CWI Series Stainless 309 is a an austenitic chromium-nickel stainless steel that provides excellent corrosion as well as heat resistance.

UNS S30900 – Cr: 22.0-24.0%, Ni: 12.0-15.0% with full chemistry to ASTM A580

CWI Series Stainless 310 is an austenitic stainless steel offering excellent oxidation resistance. Due to its high chromium and nickel content, Type 310 also has good resistance to sulfidation.

UNS S31008 – Cr: 24.0-26.0%, Ni: 19.0-22.0% with full chemistry to ASTM A580

CWI Series Stainless 316 is an austenitic chromium-nickel-molybdenum stainless steel with good general corrosion resistance and improved pitting resistance.

UNS S31600 – Cr: 16.0-18.0%, Ni: 10.0 – 14.0%, Mo: 2.0-3.0% with full chemistry to ASTM A580

The low carbon content in CWI Series Stainless 316L is intended to minimize the occurrence of grain boundary carbide precipitation.

UNS S31603 – C: 0.03% max, Cr: 16.0-18.0%, Ni: 10.0-14.0%, Mo: 2.0-3.0% with full chemistry to ASTM A580

CWI Series Stainless 316 LVM is typically regarded as a medical grade austenitic stainless steel. The high level of purity and cleanliness of this type is achieved through vacuum melting process.

CWI Series Stainless 316Ti is a titanium-stabilized version of Type 316. The addition of titanium reduces the susceptibility to sensitization.

UNS S31635 – Cr: 16.0-18.0%, Ni: 10.0-14.0%, Mo: 2.0-3.0% and Ti: 5x(C+N) min-0.70% with complete chemistry to ASTM A240

CWI Series Stainless 317 is a molybdenum bearing austenitic stainless steel with improved corrosion resistance over type 304/304L and type 316/316L stainless steel.

UNS S31700 – C: 0.08%m max, Cr: 18.0-20.0%, Mo: 3.0-4.0% and Ni: 11.0-15.0% with full chemistry to ASTM A580

CWI Series Stainless 317L is a low carbon, molybdenum bearing austenitic stainless steel. The low carbon content provides resistance to sensitization during thermal processes.

UNS S31703 – C: 0.03% max, Cr: 18.0-20.0%, Mo: 3.0-4.0% and Ni: 11.0-15.0% with full chemistry to ASTM A580

CWI Series Stainless 321 is a titanium stabilized austenitic stainless steel commonly used for service in the temperature range of 1000°F (538°C) to 1600°F (870°C).

UNS S32100 – Cr: 17.0-19.0%, Ni: 9.0-12.0%, Ti: 5xC min with full chemistry to ASTM A580

CWI Series Stainless 347 is an austenitic stainless steel alloyed with columbium (niobium) offering an excellent resistance to intergranular corrosion.

UNS S34700 – Cr: 17.0-19.0%, Ni: 9.0-13.0%, Cb (Nb): 10xC min with full chemistry to ASTM A580

400 Series Stainless

CWI Series Stainless 409 stainless steel is a ferritic steel that offers good mechanical properties and high-temperature corrosion resistance. It is commonly considered as a chromium stainless steel, with applications in exhaust systems of automobiles and applications that demand weldability.
CWI Series Stainless 409CB is a stabilized ferritic stainless steel with 11.0% chromium. It is a nonhardenable alloy (by heat treatment) and is resistant to mild atmospheres. The alloy can be cold formed and welded. 409Cb stainless has been used extensively in automotive exhaust systems.
CWI Series Stainless 410 is a martensitic stainless steel containing 11.5% chromium offering both excellent wear and corrosion resistance. UNS S41000 – Cr: 11.5-13.5% and C: 0.15% max with full chemistry to ASTM A580

CWI Series Stainless 416 is a high chromium martensitic free-machining stainless steel. Type 416 can be hardened by heat treatment to higher strength and hardness level. Type 416 is used for any part that requires considerable machining

CWI Series Stainless 420 is a high carbon, martensitic stainless steel. Maximum corrosion resistance is attained only in the fully hardened condition.

UNS S42000 – C: 0.15% min and Cr: 12.0-14.0% with full chemistry to ASTM A580

CWI Series Stainless 430 is a ferritic stainless steel with good corrosion resistance and formability characteristics. UNS S43000 – C: 0.12% max and Cr: 16.0-18.0 with full chemistry to ASTM A580

CWI Series Stainless 431 is a high chromium, low nickel, martensitic stainless steel. Type 431 stainless steel can be hardened through heat treatment processes.

UNS S43100 – C: 0.20% max, Cr: 15.0-17.0%, Ni: 1.25-2.50%

CWI Series Stainless 434 is a molybdenum bearing, non-hardenable ferritic stainless steel. The addition of molybdenum enhances the corrosion resistance of this grade.

UNS S43400 – C: 0.12%max, Cr: 16.0-18.0% and Mo: 0.75-1.25% with complete chemistry per ASTM A240

CWI Series Stainless 439 is a ferritic stainless steel designed to resist corrosion in a variety of oxidizing environments from fresh water to boiling acids. It may be used in either the annealed, cold formed or as-welded condition in many applications where other stainless steel alloys such as Type 304, Type 410, Type 409 and Type 430are used.

Type 439 Stainless Steel is attractive for numerous automotive exhaust applications. Typical uses include tubular manifolds and other exhaust system components where temperatures may exceed the oxidation limit of Type 409, or where wet corrosion resistance, particularly to chlorides, is needed.

CWI Series Stainless 440C is a high carbon martensitic stainless steel. It has high strength, moderate corrosion resistance, and good hardness and wear resistance. 440C stainless steel is used in the following applications:
  • Gage blocks
  • Cutlery
  • Ball bearings and races
  • Molds and dies
  • Knives
  • Valve components
  • Measuring instruments

CWI Series Stainless 446 is a ferritic, non-heat treatable stainless steel that provides good resistance to high temperature oxidation and corrosion.

Varied application are of 446 such as in manufacturing boiler baffles, furnace parts, X-ray tube bases, oil burner components, kiln linings, glass molds, annealing boxes and industrial mufflers.

Nitronic® Series Stainless

CWI Nitronic® Series Stainless are austenitic, high-strength, corrosion-resistant products that provide higher-performance alternatives to many conventional 300 and 400 Series Stainless steels.

Nitronic® 32 – UNS S24100 (Cr: 16.5-19.5%, Mn: 11.0-14.0%, Ni: 0.50-2.5%) per ASTM A580

CWI Nitronic® Series Stainless are austenitic, high-strength, corrosion-resistant products that provide higher-performance alternatives to many conventional 300 and 400 Series Stainless steels.

Nitronic® 50 – UNS S20910 (Cr: 20.5-23.5%, Mn: 4.0-6.0, Mo: 1.5-3.0%, Ni: 11.5-13.5%) per ASTM A580

CWI Nitronic® Series Stainless are austenitic, high-strength, corrosion-resistant products that provide higher-performance alternatives to many conventional 300 and 400 Series Stainless steels.

Nitronic® 60 – UNS S21800 (Cr: 16.0-18.0%, Mn: 7.0-9.0%, Ni: 8.0-9.0%, Si: 3.5-4.5%) per AMS 5848 and ASTM A580

GD™-SUPA® Series Stainless

CWI GD316 is austenitic stainless steel line suitable for well conditions wit medium concentration of CO2 (up to 30%) and low Chlorides (up to 2.5%) with no H2S present.

GD316

CWI GD22™ / SUPA 40® ( UNS S31803 / S32205) is austenitic stainless steel line suitable for well conditions where CO2 does not exceed 30%, providing chlorides do not exceed 2-3% with no H2S is present.

GD22

SUPA 40

CWI GD31Mo™ / SUPA75® (UNS N08926) is a “super austenitic “ stainless steel with very good general corrosion resistance and pitting resistance in aggressive environments containing high concentrations of CO2, H2S and Cl. GD31Mo offers superior corrosion resistance and mechanical properties to those of GD316.

GD31Mo

SUPA 75

CWI GD35Mo™ (UNS N08028) is a “super austenitic” stainless steel with very good general corrosion resistance and pitting resistance in aggressive environments containing high concentrations of CO2, H2S and Cl. GD35Mo offers superior corrosion resistance and mechanical properties to those of GD316.

CWI GD37Mo™ slickline wireline is a super austenitic stainless steel with increased chromium, molybdenum and nitrogen content suitable for extremely sour gas and oil well conditions with CO2, H2S and Chlorides present. GD37Mo™ is characterized by excellent resistance to pitting and crevice corrosion in sour well environments, as well as resistance to both localized and general corrosion.

GD37Mo

CWI GD50™ (UNS R30035) is a cobalt based alloy that possesses good ductility and break strength and will withstand extremely sour well conditions.

GD50

SUPA®-GD100™ slickline wireline is a highly alloyed duplex stainless suitable for well conditions with aggressive concentrations of CO2, H2S and Chlorides.

SUPA-GD100

Hi-Strength Series Stainless

CWI Hi-Strength Series Stainless 17-7 PH (631) is a precipitation hardening stainless steel that provides high strength and hardness, excellent fatigue properties, as well as good formability.

UNS S17700 – Al: 0.75-1.50, Cr: 16.0-18.0, Ni: 6.5-7.75 with full chemistry to ASTM A313 and AMS 5678

Learn more about 17-7PH®.

CWI Hi-Strength Series Stainless 13-8Mo is a precipitation hardenable stainless steel providing high strength and hardness along with good resistance against stress corrosion cracking.

UNS S13800

CWI Hi-Strength Series Stainless 15-7Mo a semi-austenitic, precipitation-hardenable stainless steel that offers high strength and hardness along with good corrosion resistance.

UNS S15700

CWI Hi-Strength Series Stainless A286 is a precipitation-hardenable, iron-nickel-chromium alloy suitable for application that require high tensile strength as well as excellent oxidation and corrosion resistance.

UNS SS66286

Resistance Alloys

70 Ni – 30 Fe
22 Cr – 4.5 Al – Bal. Fe

22 Cr – 5.5 Al – Bal. Fe

Alloy 52, 50 Ni – 50 Fe

Alloy 80/20, 80 Ni – 20 Cr

NiChrome 60, 60 Ni – 15 Cr – Bal. Fe

Stainless Gen4 Welding

A popular European grade 307 used for automotive exhaust applications and dissimilar stainless grades.

GEN 307

GEN 308/308H is used for TIG, MIG, and submerged arc welding of unstabilized stainless steels such as Types 301, 302, 304, 305, 308. This filler metal is the most popular grade among stainless steels, used for general-purpose applications where corrosion conditions are moderate. Can also be certified as ER308H.

GEN 308

308 except the carbon content has been held to a maximum of .03% to reduce the possibility of intergranular carbide precipitation. Ideal for welding Types 304L, 321, and 347 stainless steels. This is a suitable wire for applications at cryogenic temperatures.

GEN 308L

GEN 308LSi is a stainless steel welding wire for MIG welding. This wire is used to weld equipment made with 304 and 308 stainless grades. Welding speed is higher than 308 or 308L due to improved wettability of weld metal.

Learn more about GEN 308LSi.

GEN 309/309L is of similar composition as GEN 309 except for the carbon content being lower than .03%. The lower carbon content reduces the possibility of intergranular corrosion. GEN 309L is preferred over 309 for cladding over carbon or low alloy steels, as well as for dissimilar joints that undergo heat treatment.

GEN 309L

GEN 309LSi is of the same chemical com-position as 309L, with higher silicon content to improve the bead appearance and increase welding ease. The weld beads are exceptionally smooth due to good wetting.

GEN 309LSi

GEN 309LMo is typically used to weld type 316 clad steels on the first pass in cladding steel as well as to weld dissimilar metals such as molybdenum-bearing stainless steels to carbon or low alloy steels.

GEN 309LMM

GEN 310 is used for the welding of stainless steels of similar composition in wrought or cast form. The weld deposit is fully austenitic and calls for low heat during welding. This filler metal can also be used for dissimilar welding

GEN 310

GEN 312 is used to weld cast alloys of similar composition and is used to weld dissimilar metals and weld overlays. This alloy has very high ferrite. When welding similar cast alloys, limit welding to two or three layers only.

GEN 312

GEN 316/316L has the same analysis as ER316, except that the carbon content is limited to a maximum of 0.03% in order to reduce the possibility of formation of intergranular carbide precipitation. This filler metal is primarily used for welding low carbon molybdenum-bearing austenitic alloys. This low carbon alloy is not as strong at elevated temperatures as ER316H.

GEN 316L

GEN 316LSi is similar to 316L, with higher silicon content for optimum ease in welding and smooth bead appearance. Higher productivity could be realized in MIG welding.

Learn more about GEN 316LSi.

GEN 317L is used for welding stainless steels with similar composition. Due to its higher molybdenum content, this alloy offers high resistance to pitting and crevice corrosion. Lower carbon makes the weld metal less susceptible to intergranular corrosion.

Learn more about GEN 317L.

GEN 320LR has a composition similar to GEN 320, except that carbon, silicon, phosphorus, and sulfur levels are kept at lower levels as well as the columbium and manganese being specified at a narrower range. The low melting residuals are limited in this alloy to reduce the possibility of microfissuring. It is for this reason that this alloy is often used for welding Type 320 stainless steels.

GEN 320LR

GEN 330 is used to weld cast and wrought material of similar chemical composition. The weld metal provides excellent heat and scale resistance up to 1800°F. However, high sulfur environments may adversely affect elevated temperature performance. This being a fully austenitic alloy, heat input is necessary.

GEN 330

GEN 347 is a columbium-stabilized stainless steel welding wire used to weld Types 321 and 347. Addition of columbium reduces the possibility of chromium carbide precipitation and consequent intergranular corrosion.

GEN 347

GEN 385 is used for welding materials of similar chemical composition which are used for fabrication of equipment and vessels for handling of sulfuric acid and many chloride containing media. This filler metal may also find applications for joining Type 317L material where improved corrosion resistance in specific media is needed. In order to reduce the propensity for fissuring and hot cracking, the low melting con-stituents such as carbon, silicon and phosphorus are controlled to lower levels in this alloy.

GEN 385

GEN 409Nb is a ferritic stainless steel welding wire which is used to weld type 409 and 409Ti base materials. Addition of columbium leads to a preferential reaction with carbon, saving chromium from forming carbides. This improves corrosion resistance, increases strength at high temperatures, and promotes ferritic micro-structure.

GEN 409Nb

GEN 410 is used to weld Types 403, 405, 410, and 416. It is also used for welding overlay on carbon steels to resist corrosion, erosion, or abrasion. This material, being an air hardening type, calls for preheating of the joint to 350°F before welding.

GEN 410

GEN 410NiMo is used primarily to weld cast and wrought material of similar chemical composi-tion. Preheating and interpass temperature of not less than 300°F are required.

GEN 410NiMo

GEN 420 has a higher carbon content than GEN 410. This alloy is often used for surfacing applications which call for superior resistance to abrasion. It requires preheat and interpass temper-atures of not less than 400°F, followed by slow cooling. Post weld heat treatment is used to temper the weld deposit.

GEN 420

GEN 430 is a ferritic stainless steel which offers good ductility in heat treated condition. In addition to the applications of welding similar alloys, it is also used for overlays and thermal spraying.

GEN 430

GEN 430NLb is stabilized ferritic steel, which offers superior mechanical properties to 430 grade. In addition, its fatigue resistance is also higher, the fact that lead to its spontaneous popularity in the automotive industry. This product is also used for overlay cladding as well as in thermal spray applications. Preheating of the joint to a minimum of 300°F is recommended. Welding must be done with very low heat input.

GEN 430LNb

GEN 604 is mainly used for GMAW and GTAW of base metals with similar chemical composition. It can also be used to join dissimilar metal combinations such as stainless steel, carbon steel and nickel base alloys.

GEN 604

GEN 630 is a precipitation hardening stainless steel used for welding of materials of similar chemical composition. Mechanical properties of this alloy are greatly influenced by the heat treatment.

GEN 630

GEN 2209 is a filler material designed to weld duplex stainless steels such as UNS Number N31803. The welds are characterized by high tensile strength and improved resistance to stress corrosion cracking and pitting. The wire is lower in ferrite compared to that of base metal in order to obtain improved weldability.

GEN 2209

GEN 2594 provides matching chemistry and mechanical property characteristics to wrought superduplex alloys such as 2507 and Zeron 100, as well as to superduplex casting alloys (ASTM A890). The welding wire is overalloyed 2-3 percent in Nickel to provide the optimum ferrite/austenite ratio in the finished weld. This structure results in high tensile/yield strength and superior resistance to SCC and pitting corrosion.

GEN 2594

GEN 218

GEN 308Si/308LSi

GEN 309Si/309LSi

GEN 316Si/316LSi

GEN 383

GEN 439Ti

CWI Website Alloy Summary for trademarks

MP35N® SPS Technologies, LLC.; Nitronic® AK Steel Corporation; Hastelloy®Haynes International, Inc.; MONEL® INCONEL® Huntington Alloys Corporation; INVAR® Aperam Alloys Imphy