Special Metals Inconel 718 Bar Nickel Alloy 718 with Ending Machinability
Composition and Properties:
Inconel 718 is a nickel-chromium alloy that is precipitation hardenable due to significant levels of iron, niobium, and molybdenum, along with lesser amounts of aluminum and titanium. This composition provides a high degree of tensile, fatigue, creep, and rupture strength, coupled with excellent corrosion resistance in a range of environments.
Mechanical Characteristics:
With a melting point around 1260-1340°C (2300-2440°F), Inconel 718 offers resistivity against post-weld cracking and has the ability to maintain its strength under extreme temperatures, as low as cryogenic levels and as high as 700°C (1300°F). It has excellent relaxation resistance and remains ductile and tough.
Manufacturing Specifications:
Inconel 718 bars typically adhere to standards such as ASTM B637, which governs the alloy's chemical composition and mechanical properties requirements, as well as its precipitation hardening process.
Applications:
Due to its resilience and reliable performance, Inconel 718 round bars are often utilized in high-stress applications such as aerospace engine parts, fasteners, and cryogenic tanks, alongside components used in oil and gas drilling and wellhead equipment.
Physical Characteristics:
As a high-strength material, Inconel 718 can be magnetic and exhibits an excellent surface finish when machined. Bars come in a variety of diameters, which can be custom sized to meet specific demands.
Availability:
Inconel 718 is widely available and can be procured in custom lengths with a range of surface finishes tailored for specific functional requirements, such as bright annealing or age-hardening treatments to enhance its mechanical properties.
Notable Features:
- High tensile, fatigue, creep, and rupture strength
- Outstanding corrosion resistance
- Superior weldability compared to other Inconel alloys
| Grade | UNS | Density | Tensile Strength (MPa min) | Yield Strength (MPa min) | Reduction of Area min (%) | Elongation min (%) | Hardness (HRC) |
| INCONEL 718 | N07718 | 8.19 | 1275MPa min | 1034MPa min | 15% | 12% min | HRC 35-40 |
Chemical Composition(%):
| Ni | Cr | Fe | C | Mn | S | Si |
| 50.0-55.0 | 17.0-21.0 | Remainder | 0.08max | 0.35max | 0.015max | 0.35max |
| B | P | Mo | Ti | Al | Cu | Co |
| 0.006max | 0.015max | 2.8-3.3 | 0.65-1.15 | 0.2-0.8 | 0.3max | 1.0max |
Production Process:
