Differences between Inconel 625 and SS316
Composition differences:
Inconel 625: Nickel-chromium-molybdenum alloy, the main strengthening elements are molybdenum and niobium.
SS316: Stainless steel, containing elements such as chromium and nickel, and may contain molybdenum to improve corrosion resistance.
Chemical composition and mechanical properties of Inconel 625 vs SS316
| Property | Inconel 625 | SS316 |
|---|---|---|
| Chemical Composition (%) | ||
| Nickel (Ni) | 58.0 - 63.0 | Balance |
| Chromium (Cr) | 20.0 - 23.0 | 16.0 - 18.0 |
| Molybdenum (Mo) | 8.0 - 10.0 | 2.0 - 3.0 |
| Iron (Fe) | ≤5.0 | - |
| Aluminum (Al) | ≤0.4 | - |
| Titanium (Ti) | ≤0.4 | - |
| Carbon (C) | ≤0.1 | ≤0.08 |
| Manganese (Mn) | ≤0.5 | ≤2.0 |
| Silicon (Si) | ≤0.5 | ≤1.0 |
| Phosphorus (P) | ≤0.015 | ≤0.045 |
| Sulfur (S) | ≤0.015 | ≤0.03 |
| Mechanical Properties | ||
| Tensile Strength (MPa) | 760 - 965 | 515 - 730 (Annealed) |
| Yield Strength (MPa) | 345 - 550 | 205 (Min.) |
| Elongation (%) | ≥30 | ≥40 |
| Hardness (Rockwell B) | - | ≤95 (HRB) |
Performance comparison:
Inconel 625: High strength, high toughness, excellent corrosion resistance, especially good oxidation resistance and scaling resistance at high temperatures. Suitable for extreme environments, such as aircraft engines, chemical equipment, etc.
SS316: Good corrosion resistance, especially in mild environments (such as fresh water and sea water). Widely used in structural parts in general corrosive environments.
Standard product forms of inconel 625 include tubes, pipes, plates, strips, plates, round bars, flat bars, forgings, hexagonal bars and wires. These products are available in a wide variety of sizes.
Application areas:
Inconel 625: Aerospace, oil and gas, chemical processing, nuclear energy and other fields.
SS316: Widely used in various occasions requiring corrosion resistance, such as food processing equipment, medical equipment, etc.
