what is special metals inconel 625?
Inconel 625 is a nickel-chromium-molybdenum-niobium alloy that exhibits excellent oxidation resistance, corrosion resistance, and strength at high temperatures. Due to the solid solution strengthening effect of molybdenum and niobium on the nickel-chromium matrix, Alloy 625 achieves high strength properties without the need for age hardening treatment. Inconel® 625 is resistant to chloride ion stress corrosion cracking, pitting, and stress corrosion cracking, making it suitable for seawater environments. Inconel® 625 can be used in a temperature range from cryogenic temperatures up to 1800°F (980°C).
What is the difference between Inconel 625 Grade 1 and Grade 2?
Inconel 625 Grade 2 is supplied in the Solution Annealed condition. The main difference between Grade 2 and Grade 1 is the annealing temperature. In the case of Grade 1, the minimum annealing temperature is 1600F (871degC), whereas for Grade 2 it is now 2000F (1093degC).
inconel 625 composition
| C | Mn | Si | P | S | Cr | Mo | Nb | Co | Ti | Al | Fe | Ni | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MIN | – | – | – | – | – | 20.00 | 8.00 | 3.15 | – | – | – | – | – |
| MAX | 0.10 | 0.50 | 0.50 | 0.015 | 0.015 | 23.00 | 10.00 | 4.15 | 1.00 | 0.40 | 0.40 | 5.00 | BAL |
Physical Properties
| At 70°F | At 20°C | |
|---|---|---|
| Density | 0.305 lb./in³ | 8.44 g/cm³ |
| Modulus of Elasticity (E) | 30.1 x 10³ ksi | 208 GPa |
| Modulus of Rigidity (G) | 11.8 x 10³ ksi | 81.2 GPa |
| Coefficient of Expansion | 7.4 microinches/in.-°F (70-600°F) | 13.3 μm/m-°C (20-538°C) |
| Electrical Resistivity | 50.8 μ ohm.in | 129 μ ohm.cm |
| Thermal Conductivity | 68 Btu-in./ft.²hr.-°F | 9.8 W/m-K |
Typical Mechanical Properties
| Condition | Heat Treatment | Tensile Strength | Suggested Operating Conditions |
|---|---|---|---|
| Annealed | 1925-2050oF (1050-1120°C) | 120 – 150 ksi (830-1100 MPa) | -300°F to 1800°F (-184°C to 980°C) |
| Spring Temper | – | 200 – 250 ksi (1380 – 1724 MPa) | -300°F to 700°F (-184°C to 370°C) |
What is the density of Inconel 625?
The density of Inconel 625 is consistently reported as 8.44 g/cm³ (grams per cubic centimeter) or 0.305 lb/in³ (pounds per cubic inch) at room temperature, a crucial property for this nickel-chromium-molybdenum superalloy used in demanding applications like aerospace and chemical processing.
What is the hardness of Inconel 625?
Inconel 625 hardness varies with processing, but typically ranges from ~145-220 HB (Brinell) or ~22-30 HRC (Rockwell C) in its annealed state, offering a good balance of strength and ductility, though it can be hardened significantly through aging or cold working to reach higher HRC or Vickers hardness (e.g., up to ~40 HRC or ~370 HV).
What is the temperature range of Inconel 625?
Inconel 625 has an exceptionally wide service temperature range, performing from cryogenic lows (around -238°F or -150°C) up to high temperatures of about 1800°F (982°C), with excellent strength and corrosion resistance maintained across this span, and even up to 2000°F (1093°C) for certain applications like heat shields.
inconel 625 turning speeds and feeds
For Inconel 625 turning, start with lower speeds (60-80 m/min or 200-260 SFM) and lighter feeds (e.g., 0.002-0.008 in/rev or 0.05-0.2 mm/rev) with high-pressure coolant and sharp, negative rake carbide or ceramic tools, aiming for long, stringy chips to manage heat and work hardening.
who choose us?
If you have any requirements for the above items, please feel free to place an order. GNEE has a large inventory of Inconel 625 products for you to choose from. These can be processed into various practical product forms, including plates, coils, tubes, bars, wires, etc. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.ss@gneesteel.com
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