Introduction

When plant components are under attack from highly concentrated acids or alkalis attack at extreme temperatures, corrosion resistance alloys are introduced. Corrosive media such as seawater, acids, alkalis and salt solutions create rough, aggressive environments in which the materials used must have above average resistance and durability.

NiWire produces corrosion resistance alloys which are used for reactors for acetic acid production and tanks for the storage and transportation of nitric and hydrofluoric acid mixtures. In offshore engineering they are found in gas pipelines, production tubing, drill stems, pipe claddings, and umbilical for oil production, seawater pipe, condensers and coolers.

Main Grades

Grade Property and Application
Nickel 200 Commercially pure wrought nickel with good mechanical properties and corrosion resistance. Used for chemical and process plants such as caustic soda and synthetic fiber production, and for food handling.
Nickel 201 Similar to Nickel 200 but with the carbon content controlled to prevent intergranular embrittlement at service temperatures above 315 °C (600 °F). Used for chemical and process plants.
Hastelloy C22 Better overall corrosion in oxidizing environments than C-276, C-4, and 625 alloys. Outstanding resistance to localized corrosion and excellent resistance to SCC. Best alloy to use as universal weld filler metal to resist corrosion of weldments.
Hastelloy C4 An alloy with high-temperature stability in 650–1040 °C (1200–1900 °F) range as evidenced by good ductility and corrosion resistance. Virtually the same corrosion resistance as alloy C-276.
Hastelloy C276 An alloy with excellent resistance to reducing and mildly oxidizing environments. Resistant to localized attack and SCC. Used extensively in pollution control applications and throughout the chemical and process industries.
Hastelloy B3 Excellent resistance to hydrochloric acid at all concentrations and temperatures. Hastelloy B3 also withstands sulfuric, acetic, formic, and phosphoric acids and other nonoxidizing media.
Hastelloy B2 Lower carbon version of Hastelloy B that exhibits superior resistance to hydrochloric acid, aluminum chloride catalysts, and other strongly reducing chemicals. Does not exhibit propensity to weld corrosion.
Inconel 600 Combines good high-temperature strength and oxidation resistance with resistance to SCC and caustic corrosion. Used for chemical and petrochemical processing, heat treatment applications, and nuclear and automobile engineering.
Inconel 625 An alloy with resistance to severely corrosive environments, particularly to pitting, crevice corrosion, and high-temperature oxidation, and with high strength from cryogenic temperatures up to 815 °C (1500 °F). Used in aerospace engineering, gas turbines, chemical processing, oil and gas extraction, pollution control, and marine and nuclear engineering.
Inconel 690 An alloy with excellent resistance to high-temperature corrosion in applications such as nuclear steam generators, coal gasification, and sulfuric, nitric/hydrofluoric acid processing.
Inconel 725 Has the same corrosion resistance as Inconel 625, which is widely used in a broad range of severely corrosive environments.
Incoloy 825 An alloy with excellent resistance to sulfuric and phosphoric acids. Resistant to oxidizing and reducing acids, SCC, pitting, and intergranular corrosion, it is used in chemical and petrochemical processing, oil and gas extraction, pollution control, waste processing, and pickling applications.
Incoloy 925 Protection against chloride-ion stress corrosion cracking and outstanding resistance to reducing chemicals.
Monel 400 Anickel-copper alloy with high strength and excellent resistance to a range of media including seawater, dilute hydrofluoric and sulfuric acids, and alkalies. Used in marine and offshore engineering, salt production, feedwater heater tubing, and chemical and hydrocarbon processing.
Monel K500 Similar to Monel 400 but age hardenable for improved strength and hardness. Used for pump shafts, oil well tools, doctor blades, springs, fasteners, and marine propeller shafts.

 

*Hastelloy is registered trademark of Haynes International,Inc
*Inconel, Incoloy, Nimonic are registered trademark of Special Metals Corporation