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HAYNES® 718 Welding Wire – Composition, Properties, and Uses

HAYNES® 718 Welding Wire

HAYNES® 718 Welding Wire is a high-temperature nickel alloy popularly used in aircraft and gas turbine engine components. It has excellent corrosion resistance and high strength at elevated temperatures. This blog will discuss the composition, mechanical and physical properties, uses, corrosion resistance, and heat treatment of HAYNES® 718 Welding Wire.

What is HAYNES® 718 Welding Wire?

HAYNES® 718 welding wire is a high-performance alloy designed to resist high-temperature corrosion. It has good weldability and can join dissimilar nickel and stainless steels and other alloys. The wire has outstanding resistance to thermal cycling fatigue and oxidation at temperatures up to 2000°F (1095°C). The alloy also offers a combination of high strength, superior flexibility, and long service life in the most extreme environments.

HAYNES® 718 Welding Wire Composition

HAYNES® 718 Welding Wire is a nickel-chromium alloy that contains significant amounts of iron, niobium, and molybdenum. It also has trace amounts of titanium, aluminium, and cobalt. The combination of these elements gives HAYNES® 718 Welding Wire its unique properties.

Nickel: 50.0-55.0
Iron: Balance
Chromium: 17.0-21.0
Niobium + Tantalum 4.75-5.50
Molybdenum: 2.80-3.30
Titanium 0.65-1.15
Aluminum: 0.20-0.80
Manganese: 0.35 max.
Silicon: 0.35 max.
Copper: 0.30 max.
Carbon: 0.08 max.
Phosphorus: 0.015 max.
Sulfur: 0.015 max.
Boron: 0.006 max.
Other: 0.50 max.

HAYNES® 718 Welding Wire Mechanical Properties:

The mechanical properties of HAYNES® 718 Welding Wire make it ideal for high-stress applications. It has a yield strength of 120 ksi and a tensile strength of 150 ksi at room temperature. It can retain high strength even at 1,200°F.

Tensile (psi) 165,000
Mpa 1,138
Elongation (%)

HAYNES® 718 Welding Wire Physical Properties:

HAYNES® 718 Welding Wire has a 0.297 lb/in³ density and a melting point of 2,350°F. It has a thermal conductivity of 90 BTU-in/hr-ft²-°F and an electrical conductivity of 31.8% IACS. It also has a low coefficient of thermal expansion, making it ideal for use in high-temperature applications where dimensional stability is crucial.

HAYNES® 718 Welding Wire Trade Name

Class UNS Haynes
ERNiFeCr-2 N07718 HAYNES® 718

HAYNES® 718 Welding Wire Uses

HAYNES® 718 Welding Wire is a versatile material used in various applications, including aircraft and gas turbine engine components, nuclear applications, and chemical processing equipment. It has excellent corrosion resistance, making it suitable for harsh environments. It is also popularly used in the aerospace industry to manufacture parts that require high strength and durability.

HAYNES® 718 Welding Wire Corrosion Resistance

HAYNES® 718 Welding Wire is known for its excellent corrosion resistance. It can resist corrosion in harsh environments, including acidic and alkaline solutions and high-temperature gases. Its ability to resist stress corrosion cracking makes it an ideal material for nuclear applications.

HAYNES® 718 Welding Wire Heat Treatment

HAYNES® 718 Welding Wire can be heat-treated to improve strength and toughness. The heat treatment involves heating the material to a high temperature and then cooling it rapidly. This process can increase the yield and tensile strength of the material and improve its durability.


HAYNES® 718 Welding Wire is a nickel-chromium alloy known for its high strength and excellent corrosion resistance. Its unique composition and mechanical and physical properties make it ideal for high-stress and high-temperature applications. Its versatility and durability make it a popular choice in the aerospace, nuclear, and chemical processing industries. If you’re looking for a material that can withstand harsh environments and retain its strength at elevated temperatures, HAYNES® 718 Welding Wire is an excellent choice.

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