718
UNS #N07718
718 is a precipitation hardenable nickel-base alloy designed to display exceptionally high yield, tensile, and creep-rupture properties at temperatures up to 1300°F (704°C). The sluggish age-hardening response of 718 permits annealing and welding without spontaneous hardening during heating and cooling. This alloy has excellent weldability when compared to the nickel-base superalloys hardened by aluminum and titanium. This alloy has been used for jet engine and high-speed airframe parts such as wheels, buckets, spacers, and high-temperature bolts and fasteners. It has also been used extensively in oil and gas drilling and production due to its high strength and resistance to chlorides, stress corrosion, and sulfide stress cracking. Within the oil and gas industry, this alloy has been used in valves, tubing hangers, MWD/LWD parts, fishing tools, pump shafts, and wellhead components.
Type Analysis
- Carbon (Maximum) 0.08
- Phosphorus (Maximum) 0.015
- Silicon (Maximum) 0.35
- Titanium (Nominal) 0.65 - 1.15
- Manganese (Maximum) 0.35
- Sulfur (Maximum) 0.015
- Chromium (Nominal) 17.00 - 21.00
- Molybdenum (Nominal) 2.80 - 3.30
- Iron (Nominal) Balance
- Aluminum (Nominal) 0.35 - 0.80
- Copper (Maximum) 0.15
- Columbium+Tantalum (Nominal) 4.75 - 5.50
- Boron (Nominal) 0.001 - 0.006
- Nickel/Cobalt (Nominal) 50.00 - 55.00
- Cobalt (Maximum) 1.00
