Alloy Grade UNS: N07718 – Resistant to Thermal Fatigue

  • Overview

    MTEK 718, also referred as N07718 or Nickel 718, is a nickel-chromium superalloy renowned for its exceptional performance in high-temperature applications where thermal fatigue and creep resistance are critical. With a composition of up to 55% nickel and 21% chromium, this alloy exhibits high strength and excellent corrosion resistance across a wide temperature range, from cryogenic conditions (-423°F) to elevated temperatures (1300°F). Its resistance to thermal fatigue, meaning it can withstand repeated cycles of heating and cooling without cracking or degrading, makes it particularly well-suited for components in gas turbines, jet engines, and other high-temperature systems that experience rapid temperature fluctuations. Furthermore, N07718's exceptional rupture strength ensures long-term reliability and resistance to deformation under high stress at elevated temperatures.

  • Typical Uses

    Aerospace applications.

  • MetalTek Designation

    MTEK 718

  • Poured At:

    Wisconsin Centrifugal Division, Wisconsin Investcast Division

Similar Specifications

Cast UNS: N07718

Wrought UNS: N07718

Wrought Grade: IN718

Cast Grade:

Cast ASTM: NACE MR0175

Military/AMS: AMS 5383

* AMS specifying investment casting.

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.02-0.08

Chromium: 17-21

Manganese: n/a

Iron: n/a

Copper: n/a

Nickel: 50-55

Lead: n/a

Tin: n/a

Silicon: n/a

Zinc: n/a

Other: Mo 2.8-3.3; Nb 4.75-5.40; Fe; Ti; AI; Co; Others

Minimum Mechanical Properties

Brinell Typical:

0

Tensile, ksi

0

Tensile, MPa

0

Calculated PREn (Minimum)

0

Yield, ksi

0

Yield, MPa

0

Elongation

0%

Heat Treatment: Solution Annealed & Aged

Frequently Asked Questions

Severe corrosion and heat resistant steel is engineered to withstand extreme environments, including high temperatures, chemical exposure, and acidic conditions.

Applications include chemical reactors, flue gas scrubbers, incinerators, and heat treatment fixtures exposed to corrosive and thermal stress.

Alloys such as Inconel, Hastelloy, Alloy 20, and super austenitic or duplex stainless steels are ideal for high-heat and corrosion-prone conditions.

Explore Other Alloys

Gears

Non-Ferrous

Non-ferrous alloys are, literally, materials that are not iron-based. While others may provide non-ferrous materials of other materials, the MetalTek family of non-ferrous alloys are copper-based. In general, these materials deliver high strength, and excellent wear and corrosion resistance. They are often found in marine applications and also bushing, bearing, and gear environments.
Stainless Steel Parts

Stainless Steel

Stainless steels owe their ability to resist corrosion primarily to the presence of a passive film on their surface. Chromium is chiefly responsible for formation of the passive film. Iron ceases to rust at approximately 12% chromium content and resistance to oxidizing corrosives increases rapidly with chromium content up to approximately 20%.
Petrochemical Fittings

Specialty Alloys

Specialty Alloys comprise a broad group of materials that deliver properties for more demanding applications, use more exotic or expensive materials, or require special processes to manufacture. Where standard materials may not offer desired performance, specialty alloys (including those that are modified further) may be a sensible selection.