High Temperature Alloys
NICKEL ALLOY 625 (Inconel® 625)
DESCRIPTION
Nickel Alloy 625 (Inconel® 625/UNS N06625) is a popular nickel-chromium alloy that offers users a high level of strength, ease of fabrication, and excellent corrosion resistance. Nickel Alloy 625 is known for its impressive high temperature strength, resistance to oxidation and a wide range of corrosive elements, and weldability.
PRODUCT FORM
Supra Alloys meets its customers’ specialty metal needs by offering Nickel Alloy 625 in the following product forms:
- Nickel Alloy 625 Bar/Rod (ASTM B446/AMS 5666)
- Nickel Alloy 625 Plate (ASTM B443/AMS 5599)
- Nickel Alloy 625 Sheet (ASTM B443/AMS 5599)
- Nickel Alloy 625 Strip (ASTM B443/AMS 5599)
APPLICATION
High Temperature Alloys like Nickel Alloy 625 can be used in a number of different applications due to its strength, environmental resistance, and high-temperature stability. Supra Alloys’ customers represent many different sectors but most often Nickel Alloy 625 is seen in:
Aerospace applications:
- Aircraft ducting systems
- Engine exhaust
- Thrust reverser systems
Sea water applications:
- Wire rope for mooring cables
- Propeller blades
- Submarine auxiliary propulsion motors
- Sheathing for undersea communication cables
Chemical processing field:
- Heat exchangers
- Valves
Nuclear reactors:
- Reactor-core components
- Control rod components
CHEMICAL COMPOSITION
The chemical composition of Nickel Alloy 625 is as follows:
| Element | Content |
| Nickel, Ni | 60 |
| Chromium, Cr | 22 |
| Molybdenum, Mo | 9 |
| Iron, Fe | 4 |
| Niobium, Nb | 3.5 |
| Titanium, Ti | 0.3 |
| Manganese, Mn | 0.3 |
| Aluminum, Al | 0.3 |
| Silicon, Si | 0.25 |
| Carbon, C | 0.05 |
| Sulfur, S | 0.003 |
| Phosphorous, P | 0.01 |
PHYSICAL PROPERTIES
The physical properties of Nickel Alloys 625 are:
| Properties | Metric | Imperial |
| Density | 8.44 g/cm³ | 0.305 lb/in³ |
| Melting Point | 1330°C | 2425°F |
MECHANICAL PROPERTIES
The following table shows the mechanical properties of Nickel Alloys 625.
| Properties | Metric | Imperial |
| Hardness, Rockwell B (typical annealed) | 95 | 95 |
| Tensile strength (for flat products (<4″ thickness) and seamless tube and pipe) | ≥ 827 MPa | ≥ 120000 psi |
| Yield strength (for flat products (<4″ thickness) and seamless tube and pipe) | ≥ 414 MPa | ≥ 60000 psi |
| Elongation at break (typical annealed) | 45% | 45% |
INCONEL is a trademark of the Special Metals Corporation group of companies.
NICKEL ALLOY 718 (Inconel® 718)
DESCRIPTION
Nickel Alloy 718 (Inconel 718®/UNS N07718) is a nickel-chromium alloy that was developed for the aerospace industry. However, its excellent strength and corrosion resistance were recognized by the oil industry, and it is now widely used in this field also. Nickel Alloy 718 is age-hardenable to give high tensile, fatigue, creep, and rupture strength, good corrosion resistance, ease of formability and excellent weldability.
PRODUCT FORM
Supra Alloys meets its customers’ specialty metal needs by offering Nickel Alloy 718 in the following product forms:
- Nickel Alloy 718 Bar/Rod (ASTM B637/AMS5662/AMS 5663)
- Nickel Alloy 718 Plate (ASTM B670/ASTM B906/AMS 5596/AMS 5950)
- Nickel Alloy 718 Sheet (ASTM B670/ASTM B906/AMS 5596/AMS 5950)
- Nickel Alloy 718 Strip (ASTM B670/ASTM B906/AMS 5596/AMS 5950)
APPLICATION
High Temperature Alloys like Nickel Alloy 718 can be used in a number of different applications due to its strength, good corrosion resistance, ease of formability and weldability, as well as its ability to be heat-treated.
Aerospace and Power Generation:
When used in an aerospace and power generation application, Nickel Alloy 718 is age-hardened to give maximum strength and high creep resistance with typical hardness values exceeding 42HRC. Nickel Alloy 718 is mostly used in:
- Gas turbines
- Aircraft engines
- Fasteners
Oil Industry:
When used in the oil industry, Nickel Alloy 718 is age-hardened such that the hardness does not exceed 40HRC to prevent stress corrosion cracking. Nickel Alloy 718 is used within the oil industry for
- Valves
- Precision tubing
Nuclear Power:
Nickel Alloy 718 is often used in nuclear power plant applications because of its good fatigue and rupture strength.
CHEMICAL COMPOSITION
The Chemical Composition of Nickel Alloy 718 is:
| Element | Content |
| Carbon, C | 0.08 |
| Silicon, Si | 0.35 |
| Manganese, Mn | 0.35 |
| Phosphorous, P | 0.015 |
| Aluminum, Al | 0.8 |
| Boron, B | 0.6 |
| Cobalt, Co | 1.0 |
| Chromium, Cr | 21.0 |
| Copper, Cu | 0.3 |
| Iron, Fe | |
| Molybdenum, Mo | 3.3 |
| Niobium, Nb | 5.5 |
| Nickel, Ni | 55.0 |
| Titanium, Ti | 1.15 |
MECHANICAL PROPERTIES
The Mechanical Properties of Nickel Alloy 718 are:
| Temper | Solution-treated |
| Tensile Rm | 155 ksi (max.) |
| Tensile Rm | 1069 MPa (max.) |
| R.p. 0.2% Yield | 95 ksi (max.) |
| R.p. 0.2% Yield | 655 MPa (max.) |
| Elongation (2” or 4D gl) | 30% (min.) |
PHYSICAL PROPERTIES
The physical properties of Nickel Alloy 718 are as follows:
| Solution Treated | Solution Treated and Aged | |
| Density | 0.296 lb/in3 (8.192 g/cm3) | 0.297 lb/in3 |
| Specific Gravity | 8.19 | 8.22 |
| Melting Range | 2500-2600°F | 1370-1430°C |
INCONEL is a trademark of the Special Metals Corporation group of companies.
NICKEL ALLOY A286
DESCRIPTION
Nickel Alloy A-286 (UNS S66286) is iron-nickel-chromium based austenitic material with additions of molybdenum and titanium. Nickel Alloy A-286 is known for maintaining good strength and oxidation resistance, especially at temperatures up to 1300°F (700°C). Nickel Alloy A-286 has high ductility and excellent fabrication characteristics.
Nickel Alloy A-286 is solution annealed at 982°C (1800°F), This heat treatment improves the strength of the alloy.
PRODUCT FORM
Supra Alloys provides its customers with Nickel Alloy A-286 in the following forms:
- Nickel Alloy A-286 Bar/Rod (ASTM A638/AMS 5726/AMS 5731/AMS 5732/AMS 5734/AMS 5737/AMS 5895)
- Nickel Alloy Plate (AMS 5525/AMS 5858)
- Nickel Alloy Sheet (AMS 5525/AMS 5858)
- Nickel Alloy Strip (AMS 5525/AMS 5858)
APPLICATION
Common applications for Nickel Alloy A-286 include:
Automotive:
- Engine and Manifold components
Oil and gas:
- Offshore components subject to high levels of heat and stress
- Turbine wheels, blade, frames, and casings
Aerospace:
- Jet engines, and afterburner parts
- Fasteners
CHEMICAL COMPOSITION
The chemical composition of super Nickel Alloy A-286 is as follows:
| Element | Content (%) |
| Iron, Fe | 54 |
| Nickel, Ni | 25.5 |
| Chromium, Cr | 14.8 |
| Titanium, Ti | 2.13 |
| Molybdenum, Mo | 1.30 |
| Manganese, Mn | 1.0 |
| Silicon, Si | 0.50 |
| Vanadium, V | 0.30 |
| Aluminum, Al | 0.18 |
| Carbon, C | 0.040 |
| Phosphorous, P | 0.020 |
| Sulfur, S | 0.015 |
| Boron, B | 0.0060 |
PHYSICAL PROPERTIES
The following table shows the physical properties of Nickel Alloy A-286.
| Properties | Metric | Imperial |
| Density | 7.92 g/cm3 | 0.286 lb/in3 |
| Melting point | 1399°C | 2550°F |
MECHANICAL PROPERTIES
The mechanical properties of Nickel Alloy A-286:
| Properties | Metric | Imperial |
| Tensile strength | 1035 MPa | 150100 psi |
| Yield strength | 759 MPa | 110000 psi |
| Elongation at break | 25% | 25% |
| Reduction of area | 40% | 40% |
| Hardness, Rockwell C | 32 | 32 |