quality Alloy 718 Quenched and Tempered Forged Flange - Nickel-Based Superalloy for High-Temperature Applications factory

Alloy 718 Quenched and Tempered Forged Flange - Nickel-Based Superalloy for High-Temperature Applications

Alloy 718 forged flange offers excellent high-temperature strength, creep & corrosion resistance for aerospace & power generation. Features nickel-chromium base with Nb/Ti/Al strengthening and tight impurity control per ASTM/AMS specs.

Product Details

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Alloy 718 forged flange

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Nickel-based superalloy flange

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High-temperature welding neck flange

Product Description

Alloy 718 Quenched and Tempered Forged Flange

Alloy 718 (commonly called Inconel 718 or Alloy 718) is a nickel-based superalloy widely used in aerospace, power generation, and high-temperature applications due to its excellent strength, creep resistance, and corrosion resistance.

Chemical Composition

The chemical composition is typically specified in weight percent. A standard composition range (per common specifications like ASTM and AMS) is approximately:

Element	Composition Range
Nickel (Ni)	50.0 – 55.0%
Chromium (Cr)	17.0 – 21.0%
Iron (Fe)	Balance (usually around 17 – 19%)
Niobium (Nb) + Tantalum (Ta)	4.75 – 5.50%
Molybdenum (Mo)	2.80 – 3.30%
Titanium (Ti)	0.65 – 1.15%
Aluminum (Al)	0.20 – 0.80%
Cobalt (Co)	≤ 1.0%
Manganese (Mn)	≤ 0.35%
Silicon (Si)	≤ 0.35%
Copper (Cu)	≤ 0.30%
Carbon (C)	≤ 0.08%
Phosphorus (P)	≤ 0.015%
Sulfur (S)	≤ 0.015%
Boron (B)	≤ 0.006%

Key Composition Features

Nickel-chromium base: The high nickel (around half the alloy) and significant chromium content provide excellent high-temperature strength and oxidation/corrosion resistance.
Nb, Ti, and Al for strengthening: Niobium, titanium, and aluminum form precipitates (γ'' and γ' phases) during heat treatment, which gives Alloy 718 its remarkable strength up to around 650°C.
Iron as balance: Unlike some other nickel superalloys that are almost all Ni + Cr, 718 keeps costs more manageable by using iron as a balancing element while maintaining high performance.
Tight control of impurities: Low carbon, sulfur, and phosphorus levels are crucial for weldability, toughness, and resistance to cracking.

Important Note: When selecting or verifying Alloy 718 for engineering or industrial use, always refer to the exact specification you're working to (e.g., ASTM B637, AMS 5662/5663/5664, etc.), as slight variations in composition and heat treatment are allowed depending on product form and required properties.