UNS N07718 Inconel 718 Nickel-chromium Based High Temperature Alloy Rod

Inconel 718 nickel-chromium-based high-temperature alloy rods have become an important material in the fields of aerospace, energy, and chemical industry due to their excellent high-temperature strength, corrosion resistance, and creep resistance.

Material:

Inconel 718 (UNS N07718) is a precipitation-strengthened nickel-chromium-based high-temperature alloy. By adding elements such as niobium (Nb), molybdenum (Mo), aluminum (Al) and titanium (Ti), γ'' (Ni₃Nb) and γ' (Ni₃(Al,Ti)) strengthening phases are formed, so that it can maintain excellent mechanical strength, creep resistance and corrosion resistance at high temperatures.

Main components (wt.%):

Nickel (Ni): 50-55% (matrix)

Chromium (Cr): 17-21% (anti-oxidation/corrosion)

Iron (Fe): Balance (reduces cost and stabilizes austenite structure)

Niobium + Molybdenum (Nb+Mo): ~5% (main strengthening element)

Aluminum + Titanium (Al+Ti): 0.8-1.2% (auxiliary strengthening)

Core characteristics:

1. High temperature performance: long-term working temperature can reach 700°C (1290°F), short-term resistance to 980°C (1800°F).
2. High strength: yield strength (≥1030 MPa) and tensile strength (≥1240 MPa) far exceed ordinary stainless steel.
3. Corrosion resistance: Resistant to chloride stress corrosion, oxidation, and sulfidation environments, suitable for acidic and marine environments.
4. Processing friendliness: Mechanical properties can be further improved by age-hardening.

Heat treatment:

Solution treatment: 955°C ±10°C, 1 hour/25mm thickness, water quenching.

Age hardening: 720°C ±5°C (8 hours) → 620°C ±5°C (8 hours), air cooling.

• Selection comparison (Inconel 718 vs. other high temperature alloys)
  Alloy	Maximum operating temperature	Key Benefits	Limitation
  Inconel718	700℃	Best comprehensive performance, high cost performance	When the temperature is >650℃ for a long time, the γ" phase will coarsen.
  Inconel 625	870℃	Higher corrosion resistance, no age hardening	Lower strength (yield strength ~550 MPa).
  Haynes 282	800℃	Better creep resistance	High cost and difficult processing.

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• Typical application areas

  Aerospace: jet engine turbine discs, compressor shafts, combustion chamber components (accounting for more than 50% of aviation alloy usage)

  Energy industry: gas turbine blades, nuclear reactor pressure vessel bolts

  Petrochemical: downhole tools, valve stems, high-corrosion environment pump shafts

  Automobile racing: turbocharger housings, exhaust system high-temperature bolts

  
  Quality Assurance:

• Full process control: vacuum induction melting (VIM) + electroslag remelting (ESR) to ensure low oxygen/sulfur content.

More grades:

Hunan Dinghan New Material Technology Co.,Ltd. (DINGSCO) specialized in Nickel Based Corrosion Resistant and High Temperature alloys products which used in the world’s most technically demanding industries and applications.

We have complete advanced technology facilities to produce best quality alloys to meet exacting your specifications such as VIM (Vacuum lnduction Melting) furnace to provide high purity Alloys,ESR (Electro Slag Re-melting) furnace to enhances the structure and purity of the Alloys, and CNC machining equipments (Lathe, Wire cutting, Drilling,Milling) to provide high precision finished products.

We are dedicated to providing our customers with best quality products,fastest possible deliveries, most competitive prices of Nickel Based Corrosion Resistant and High Temperature alloys in bars,rods,forged flanges, valve parts, forged shapes (shafts, discs, blocks, hubs,rings, cylinders and tailor shapes) according to ASTM,ASME,API,AMS, NACE and other industry standards.

We can help you gain a competitive edge in the market by responding to a rush quote in less than 24 hours and even complex requests for price and delivery quotations are responded to within 48 hours.