Corrosion Resistant Alloys

Corrosion can occur from two primary factors, acids that are oxidising or reducing. The most tricky situations are when these are mixed, used in the same equipment or when additional heat is added.

HPAlloys is proud to present the following materials. We have also included some materials that exhibit good corrosion-erosion, or good corrosion-wear properties.

(UNS N10276) Ni 57.0, Mo 16.0, Cr 15.5, Fe 5.5, W 3.8
Outstanding corrosion resistance in reducing and oxidizing environments. Maintains corrosion resistance in welded condition. Excellent resistance to pitting and stress-corrosion cracking (SCC).
Widely used in severest environments in chemical processing, pollution control, pulp and paper.
(UNS N10665) Ni 68, Mo 28, Fe 2, Co 1, Cr 1
Significant resistance to reducing environments. This alloy also provides resistance to pure sulfuric acid and a number of non-oxidizing acids. Industry users like the resistance to a wide range of organic acids and the resistance to chloride-induced SCC.
One of its advantages is the heat affected weld zones have reduced precipitation of carbides and other phases to ensure uniform corrosion resistance. Chemical processing industry involving sulfuric, phosphoric, hydrochloric and acetic acid. Temperature uses vary from ambient to 1500°F depending on the environments.
(UNS N06022) Ni 58, Cr 22, Mo 13.0, Fe 3.0, W 3.0
Better corrosion than C-276 in select environments. Resistance to a wide range of organic acids and the resistance to chloride-induced SCC, and other reducing chemicals. Also has resistance to some oxidizing environments.
Recommended for welding filler metal for general corrosion resistance in many applications.
(UNS N06625) Ni 61.0, Cr 21.5 Mo 9.0, Nb+Ta 3.6 High strength and toughness from cryogenic temperatures to 1800 degrees F (980 degrees C), good oxidation resistance, exceptional fatigue strength, and good corrosion resistance. Chemical and pollution control equipment, ash pit seals, nuclear reactors, marine equipment, ducting, thrust reverser assemblies, fuel nozzles, afterburners, spray bars.
(Alloy 218) (UNS S21800) Fe 63, Cr 17, Mn 8, Ni 8.5, Si 4, N 0.13 High strength fully Austenitic alloy that resists galling and wear. Significantly lower cost to extend part life and lower maintenance. The yield strength is twice that of 304 and 316 stainless steels, in the annealed condition. Tensile strengths can be produced in excess of 200 ksi. Chloride pitting is superior to that of type 316, and the oxidation resistance is similar to type 321 at elevated temperatures, and excellent cryogenic impact strength. Valve stems, seats, and trim; fastening systems, screening, pins, bushings, roller bearings, pump shafts and rings. Food handling, medical, automotive, aerospace and nuclear.
(XM-19) (UNS S20910) Fe 57, Cr 22, Ni 13, Mn 5, Mo 2, Si 1
High strength Austenitic with superior corrosion resistance to types 316 and 316L, with approximately twice the yield strength in the annealed condition. Also fully Austenitic, this alloys stays non-magnetic when severely cold reduced. Cryogenic properties are also outstanding as well as elevated temperatures.
Pumps, valves, fittings, fasteners, cables, chains, wire cloth, marine hardware, shafts, and springs.
Low alloy version of NITRONIC 60, primarily used for abrasion resistance, or corrosion abrasion requirements. Corrosion and abrasion resistant, tough and durable, NITRONIC 30 is the stainless steel for your abrasive needs. Ball mill tests have shown that many application standards, such as AR 500 suffer six to seven times as much metal loss as NITRONIC 30. Economical, low alloy, corrosion resistant, abrasion resistant stainless steel. This is a popular replacement for carbon steel, due to the resistance to outside weather conditions.
(UNS S32550) Fe 62, Cr 25.5, Ni 5.5, Mo 3.4 Cu 2.0, Mn 1.6, Si 0.7, N 0.2
Duplex alloy with a high strength to weight ratio, with superior abrasion and cavitation resistance. Resistance to chloride SCC, as well as crevice corrosion and pitting. Good ductility with a high fatigue strength in marine applications. Twice the yield strength of Alloy 20, and stronger than Duplex 2205. An excellent 40°C critical pitting temperature (ASTM G48-Method A), twice that of Alloy 2205.
Valves, pumps, shafts, marine environments, Applications in down-hole, waste water, polycarbonate production, and dematerialized water production.
(UNS S31277) 6 Moly minimum grade.
An advanced 7% molybdenum super-austenitic stainless steel offering corrosion resistance in most environments superior to 6% molybdenum super-austenitic stainless steels. In many environments, alloy 27-7MO offers resistance approaching or exceeding that of much more highly alloyed materials such as INCONEL alloys 625, 22 and C276. Applications for this allow are found in the pollution control, power, marine, chemical processing, pulp and paper, pharmaceutical and oil and gas industries.
(UNS N08020) Ni 35, Fe 37, Cr 20, Cu 3.5, Mo 2.5
Excellent resistance to chemicals containing chlorides and sulfuric, phosphoric, and nitric acids. Resists pitting, crevice corrosion, SCC, and intergranular attack.
Pickling tanks, gas scrubbers, piping, heat exchangers, pumps, shafts and valves. Synthetic rubber, pharmaceutical production and other process equipment.
(UNS N02200) Ni 99.6 C 0.08
Commercially pure wrought nickel, good mechanical properties, excellent resistance to many corrosives. Nickel 200 has higher carbon (0.08% max.) for added strength.
Food processing equipment, chemical shipping drums, caustic handling equipment and piping, electronic parts, aerospace and missile components, rocket motor cases, magneto-strictive devices
(UNS N02201) Ni 99.6 C 0.02
Commercially pure wrought nickel, good mechanical properties, excellent resistance to many corrosives. Nickel 201 has low carbon (0.02% max.) for applications over 600 degrees F (315 degrees C).
Food processing equipment, chemical shipping drums, caustic handling equipment and piping, electronic parts, aerospace and missile components, rocket motor cases, magneto-strictive devices
(UNS N04400) Ni 66.5 Cu 31.5
High strength, good weldability, excellent corrosion resistance over wide range of temperatures and conditions.
Valves, pumps, shafts, marine fixtures, fasteners, electrical, and electronic components, processing equipment, petroleum refining and production equipment, feed water heaters and other heat exchangers.
(UNS N04405) Ni 66.5 Cu 31.5 S 0.04 (Similar to MONEL alloy 400) Solid solution strengthened alloy with high strength and toughness over a wide range of temperatures. Corrosion resistant and oxidation resistant to 1000°F. Controlled sulfur added for improved machinability over alloy 400.
Water meter parts, screw machine products, fasteners, valve parts.
(UNS N05500) Ni 65.5 Cu 29.5 Al 2.7, Ti 0.6
Age-hardenable version of MONEL alloy 400 for increased strength and hardness. Good strength and ductility from -423 to 1200°F. Pump shafts, doctor blades and scrapers, oil-well drill collars and instruments, electronic components, springs, valve trim, fasteners.
(UNS N06600) Ni 76.0, Cr 15.5, Fe 8.0
High nickel, high chromium content for resistance to oxidizing and reducing environments; for severely corrosive environments at elevated temperatures. Good oxidation resistance to 2150°F. Good formability.
Furnace muffles, electronic components, chemical and food processing equipment, heat treating equipment, nuclear steam generator tubing.


HASTELLOY,  HAYNES and C-22 are registered trade names of Haynes International, Inc.
MONEL & INCONEL are registered trade names of INCO family of companies.
NITRONIC is a registered trade name of Armco, Inc.
CARPENTER & 20Cb-3 are registered trade names of Carpenter Technology Corporation.
FERRALIUM is a registered trade name of Langley Alloys, LTD.