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Alloy Portfolio

Corrosion Resistant Alloys

Nickel Base Alloys

Designations Equivalent Specifications Major Elements Chemical Compositions(%) Properties Applications
ASTM JIS Ni Cr Mo Cu Fe Other Elements
N-201(Low-Carbon Nickel) B160
UNS N02201
NW2201 99.5 - - - - C 0.1 Commercially pure (99.6%) wrought nickel essentially the same as Nickel 200 but with a lower carbon content to prevent embrittlement by intergranular0 carbon at temperatures over 600°F (315°C). Lower carbon content also reduces hardness, making Nickel 201 particularly suitable for cold-formed items. Used in food, caustic soda, medicine, and synthetic fiber processing.
C-20Cb3(carpenter Austenitic Stainless Steel) B462&473
UNS N08020
- 35.0 20.0 2.5 3.5 37.0 Nb+Ta 0.6 A nickel-iron-chromium, with additions of copper, molybdenum and niobium, having excellent resistance to pitting corrosion, crevice corrosion, and boundary corrosion in media including sulfuric acid or oxidized acid. Used for tanks, heat exchangers, valves, pumps, and piping in chemistry and petrochemistry equipment.
M-400(Monel) B164&564
UNS N04400
NW4400 66.5 - - 31.5 1.0 - A nickel-copper alloy with high strength and excellent corrosion resistance in a range of media including seawater, hydrofluoric acid, sulfuric acid, and alkalies. Used for marine engineering, chemical and hydrocarbon processing equipment, valves, pumps, shafts, fittings, fasteners, and heat exchangers.
MK-500(Monel) B865
UNS N05500
NW5500 65.5 - - 29.5 1.0 Al 2.7
Ti 0.6
A precipitation-hardenable nickel-copper alloy that combines the corrosion resistance of MONEL alloy 400 with greater strength and hardness. It also has low permeability and is nonmagnetic to temperatures as low as -150°F(-101°C). Used for pump shafts, oil well tools and instruments, doctor blades and scrapers, springs, valve trim, fasteners, and marine propeller shafts.
I-600(Inconel) B166&564
UNS N06600
NCF600 76.0 15.5 - - 8.0 - A nickel-chromium alloy with good oxidation resistance at high temperatures and resistance to chloride-ion stress-corrosion cracking, corrosion by high-purity water, and caustic corrosion. Used for furnace components, in chemical and food processing, in nuclear engineering, and for sparking electrodes
I-625(Inconel) B446&564
UNS N06625
NCF625 61.0 21.5 9.0 - 2.5 Nb+Ta 3.7 A nickel-chromium-molybdenum alloy with an addition of niobium that acts with the molybdenum to stiffen the alloy’s matrix and thereby provide high strength without a strengthening heat treatment. The alloy resists a wide range of severely corrosive environments and is especially resistant to pitting and crevice corrosion. Used in chemical processing, aerospace and marine engineering, pollution-control equipment, and nuclear reactors.
I-690(Inconel) B166&564
UNS N06690
NCF690 61.5 29.0 - - 9.0 - INCONEL alloy 690 is a high-chromium nickel alloy having excellent resistance to many corrosive aqueous media and high-temperature atmospheres. The alloy's high chromium content gives it excellent resistance to aqueous corrosion by oxidizing acids (especially nitric acid) and salts, and to sulfidation at high-temperatures. In addition to its corrosion resistance, alloy 690 has high strength, good metallurgical stability, and favorable fabrication characteristics. Used in coal gasification, nuclear fuel reprocessing, nuclear reactors, and for tanks and heating coils in pickling processing.
I-825(Incoloy) B425&564
UNS N08825
NCF825 42.0 21.5 3.0 2.2 30.0 Ti 0.9 A nickel-iron-chromium alloy with additions of molybdenum and copper. It has excellent resistance to both reducing and oxidizing acids, to stress-corrosion cracking, and to localized attack such as pitting and crevice corrosion. The alloy is especially resistant to sulfuric and phosphoric acids. Used for chemical processing, pollution-control equipment, oil and gas well piping, nuclear fuel reprocessing, acid production, and pickling equipment.
H-C276
H-MA276
(Hastelloy)
B574&564
UNS N10276
NW0276 57.0
15.5 16.0 - 6.0 W 4.0 Versatile, corrosion resistant alloy. Very good resistance to reducing, and mildly oxidizing corrosives. Excellent stress corrosion cracking resistance with very good resistance to localized attack. Used for reaction chemical reactors and vessels, in flue gas desulfurization or denitration process, and for heat exchangers
I-C22
H-MA22
(Hastelloy)
B574&564
UNS N06022
NW6022 57.0 22.0 13.0 - 4.0 W 3.0 Better overall corrosion resistance in oxidizing corrosives than C-4, C-276 and 625 alloys. Outstanding resistance to localized corrosion and excellent resistance to stress corrosion cracking.. Used for chemical processing, flue gas desulfurization, paper bleaching, and toxic waste incineration equipment
H-MA-B2(Hastelloy) B335&564
UNS N10665
NW0665 70.0 - 28.0 - ≦2 - Excellent resistance to hydrochloric acid and other strongly reducing chemicals. Used for fluoroplastics molding cylinder screws, reaction chemical reactors and vessels, heat exchangers and piping in petrochemistry processing.
NAR-B(General Corrosive Service) B581
UNS N06975
- 50.0 25.0 6.0 1.0 bal Ti 1.0 An alloy with extremely excellent resistance to acid and alkali, various types of local corrosion, and stress corrosion cracking with chloride. Used in high density chloride processing, seawater equipment, and acid and alkali reactors.

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Iron Base Alloys

Designations Equivalent Specifications Major Elements Chemical Compositions(%) Properties Applications
ASTM JIS Ni Cr Mo Cu Fe Other Elements
NAR-A(Austenitic Stainless Steel) B621
UNS N08320
- 26.0 22.0 5.0 - bal Ti 0.3 An alloy with good resistance to the pitting corrosion, and the crevice corrosion in seawater, at high temperatures, and in high density salt solution. Used for seawater equipment, public nuisance control , various acids and alkali equipment, and corrosion resistant heat exchangers
NAR-AC-3(Austenitic Stainless Steel) B649
UNS N08925
SUS836L 25.0 20.0 6.2 1.0 bal N 0.14 An alloy with excellent seawater resistance. The alloy has more excellent resistance to pitting corrosion in hot seawater than duplex stainless steels and SUS329J4L. The alloy's resistance to stress-corrosion cracking in chloride-laden environments is higher than SUS316L. Used for seawater heat exchangers, in seawater desalination plants, in salt processing, in pulp and paper manufacturing plants.
NAR-20-25LMCu(Austenitic Stainless Steel) A182
UNS N8904
SUS890L 25.0 20.0 4.5 1.5 bal - An alloy with excellent resistance to the pitting corrosion, the crevice corrosion, and the stress corrosion cracking caused by the chloride. The resistance to non-oxidizing acids such as sulfuric acid, phosphoric acid, and acetic acids is more excellent than SUS316 and SUS317. The resistance to seawater is excellent. Used in chemical and saline water conversion processing, for flue gas desulfurization, refuse incineration, and excreta disposal equipment.
NAR-SN-1(Austenitic Stainless Steel) - - 14.0 17.0 - - bal Si 4.3 An alloy with excellent corrosion resistance to nitric acid with densities of all kinds as well as high density nitric acid of 60℃ or less. Used in nitric acid processing, for 98% nitric acid storage and transportation tanks, and for nitric-sulfuric mixed acid tanks.
NAR-SN-3(Austenitic Stainless Steel) - - 16.5 11.0 - - bal Si 6.0
Ti 0.1
Zr 0.5
An alloy with excellent corrosion resistance to boiling high density nitric acid of 85% or more. Used for deep nitric acid heat exchangers.
NAR-SN-5 - - 8.4 27.0 - - bal Si 0.6
N 0.10
A duplex stainless steel with high strength and excellent corrosion resistance to medium density nitric acid. Used for medium density nitric acid heat exchangers and towers.
HR254 A182
UNS S31254
SUS312L 18.0 20.0 6.0 0.8 bal N 0.2 An alloy with excellent resistance to stress-corrosion cracking with chloride, and it is higher than SUS316 and duplex stainless steels. The alloy has good resistance to corrosion with sulfuric acid and the organic acid. Used in food, saline water conversion processing, semiconductor, paper, pulp, and stack gas desulfurization processing, and for medical equipment.
SUS310M A182
UNS S31050
- 22.0 25.0 2.1 - bal N 0.12
Mn 1.7
The alloy has good resistance to the pitting corrosion, the stress-corrosion cracking, and the crevice corrosion in seawater and the environment including chlorine. Used in urea and ammonia processing.

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Duplex Stainless Steels

Designations Equivalent Specifications Major Elements Chemical Compositions(%) Properties Applications
ASTM JIS Ni Cr Mo Cu Fe Other Elements
NAR-DP-3 - SUS329J4L 7.2 25.2 3.2 0.5 bal W 0.3
N 0.14
C 0.02
A duplex stainless steel having resistance to chloride-ion corrosion. It has excellent resistance to pitting corrosion and stress-corrosion cracking in hot seawater. Used for marine engineering, urea processing, paper manufacturing and chemical processing equipment
NAR-DP-12 - SUS329J4L 7.2 25.3 2.6 0.3 bal W 0.2
N 0.14
C 0.02
A duplex stainless steel having resistance to grain boundary corrosion in heat affected zone by welding. Used for urea processing equipment.
NAR-DP-3W A182
UNS S39274(F54)
- 6.7 25.1 3.2 0.5 bal W 2.0
N 0.3
C 0.02
A duplex stainless steel having resistance to chloride-ion corrosion and pitting corrosion and stress corrosion cracking in hot seawater. Used for chemical reactors, piping and heat exchangers in offshore structures, oil well, and food sterilization equipment.
SAF2205 A182
UNS S31803(F51)
SUS329J3L 5.5 22.0 3.0 - bal N 0.14
C 0.02
A duplex stainless steel having resistance to chloride-ion corrosion and pitting corrosion and stress corrosion cracking in hot seawater. Used for heat exchangers, water tanks, and oil well equipment.
SAF2507 A182
UNS S32750(F53)
- 7.0 25.0 4.0 0.5 bal N 0.28
C 0.03
A duplex stainless steel with additions of chromium molybdenum and copper. It has especially excellent resistance to chloride-ion corrosion. The minimum PRE of it is 41.5. Used for seawater heat exchangers in chemical and oil refinement plants, high pressure piping in oil wells, and pressure vessels in reverse osmotic seawater conversion.
SUS329J1 - SUS329J1 5.0 25.0 2.0 - bal - An alloy having corrosion resistance, more excellent than UNS31600, to pitting and stress corrosion cracking in an environment with chloride-ion less than seawater. Used in flue gas desulfurization processing, for floodgate, and in chemical plants.

*PRE(Pitting Resistance Equivalence)=Cr%+3.3Mo%+16N%

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