Inconel718 (Alloy 718) N07718 is the national standard grade GH4169
UNS N07718
Inconel® 718 (Alloy 718) UNS N07718 Standard:
Inconel 718 (Nickel 718) Strip, Coil, Foil, Wire, AMS 5596, AMS 5597, ASTM B670, WESTINGHOUSE NFD310021 (Nuclear), UNE N07718
describe
UNS N07718 is a nickel-chromium alloy with precipitation hardenable properties and high creep rupture strength at temperatures up to 1300°F (700°C). The poor age hardening response of Alloy 718 allows annealing and welding without spontaneous hardening during heating and cooling. The alloy has excellent weldability compared to nickel-based superalloys hardened by aluminum and titanium.
N07718 Chemistry Typical
Nickel (plus cobalt): 50.00-55.00
Chrome: 17.00-21.00
Iron: surplus
Niobium (plus tantalum): 4.75-5.50
Molybdenum: 2.80-3.30
Titanium: 0.65-1.15
Aluminum: 0.20-0.80
Cobalt: ≤1.00
Carbon: ≤0.08
Manganese: ≤0.35
Silicon: ≤0.35
Phosphorus: ≤0.015
Sulfur: ≤0.015
Boron: ≤ 0.006
Copper: ≤0.30
N07718 Physical Properties
Density: 0.296 lbs/in3, 8.19 g/cm3
Specific heat: Btu/lb°F (J/kg°C):
At 70°F (21°C): 0.104 (435)
Average coefficient of thermal expansion: in / in ! °(mm/m/°C) 70 - 212°F (20 - 100°C): 7.6 x 10-5 (13.0)
Modulus of elasticity: KSI (MPa) 29.7 x 103 (204.9 x 103) tensile
Magnetic permeability, H = 200 Oersted:
Annealing: 1.013
Annealing and Aging: 1.011
Melting range: 2300 - 2437°F (1260 - 1336°C)
Inconel® 718 (Alloy 718) UNS N07718 Form
Coils - strips, foils, striplines - profiles, round, flat, square
Inconel® 718 (Alloy 718) UNS N07718 Mechanical Properties at Room Temperature
Annealing typical
Ultimate tensile strength: 120 KSI min (827 MPa min)
Yield Strength: (0.2% offset) 60 KSI min (414 MPa min)
Elongation: 30%min (Gage: >0.040 inches)
Inconel® 718 (Alloy 718) UNS N07718 Heat Treatment Capabilities
Two heat treatments are commonly used for UNS N07718: solution annealing at 1700-1850°F followed by rapid cooling, usually in water, plus precipitation hardening at 1325°F for 8 hours, furnace cooled to 1150°F, maintained at Total aging time is 18 hours at 1150° F, then air cooled. The solution is annealed at 1900 - 1950°F, then rapidly cooled, usually in water, plus precipitation hardened at 1400°F for 10 hours, furnace cooled to 1200°F, held at 1200°F for a total aging time of 20 hours, then passed through air cool down.
heat treatment
UNS N07718 can be hardened by: cold working age hardening cold working followed by age hardening
