What are the differences between 925 alloy and 718 alloy?
What are the differences between 925 alloy and 718 alloy?
The main difference lies in their chemical composition. Alloy 718 has a higher nickel content (>50%), while Alloy 925 has a lower nickel content (38-46%) but a higher iron content. This makes Alloy 925 a more cost-effective alternative while providing comparable strength, particularly suitable for oil and gas applications, and offering better resistance to sulfide stress cracking and pitting in acidic environments. Alloy 718 is renowned for its high strength over a wide temperature range and is widely used in the aerospace industry.
What are the alternatives to Inconel 718?
Inconel 718 is a unique nickel-based alloy, therefore there is no direct equivalent. However, several other nickel-based alloys have similar properties and can serve as alternatives in certain applications. Some of these alloys include Rene 41.
When selecting materials for high-performance applications, alloys 925 and 718 are two common nickel-based alloys. While both offer excellent strength, corrosion resistance, and durability, they are designed for different purposes, and their chemical compositions, mechanical properties, and applications vary. This article will explore the key differences between these two alloys.
1. Chemical Composition
| Element | Alloy 925 (Incoloy 925) | Alloy 718 (Inconel 718) |
|---|---|---|
| Nickel (Ni) | 42-46% | 50-55% |
| Iron (Fe) | Balance | Balance |
| Chromium (Cr) | 19.5-23.5% | 17-21% |
| Molybdenum (Mo) | 2.5-3.5% | 2.8-3.3% |
| Copper (Cu) | 1.5-3.0% | - |
| Titanium (Ti) | 1.9-2.4% | 0.65-1.15% |
| Aluminum (Al) | 0.1-0.5% | 0.2-0.8% |
| Niobium (Nb) | - | 4.75-5.5% |
2. Mechanical Properties
| Property | Alloy 925 | Alloy 718 |
|---|---|---|
| Yield Strength | ≥1034 MPa (150 ksi) | 1034-1241 MPa (150-180 ksi) |
| Tensile Strength | ≥1276 MPa (185 ksi) | 1241-1480 MPa (180-215 ksi) |
| Hardness | Rockwell C30-40 | Rockwell C35-45 |
| Creep Resistance | Moderate | Excellent (up to 700°C) |
3. Corrosion Resistance
| Factor | Alloy 925 | Alloy 718 |
|---|---|---|
| Sulfide Stress Cracking Resistance | Excellent | Moderate |
| Chloride Pitting Resistance | High | Moderate |
| Oxidation Resistance | Moderate | Excellent (High Temperatures) |
4. Applications
| Industry | Alloy 925 | Alloy 718 |
|---|---|---|
| Oil & Gas | ✓ (tubing, valves, downhole equipment) | ✗ |
| Marine | ✓ (seawater-resistant components) | ✗ |
| Chemical Processing | ✓ | ✗ |
| Aerospace | ✗ | ✓ (jet engines, turbine blades) |
| Nuclear Reactors | ✗ | ✓ |
| High-Temperature Fasteners & Springs | ✗ | ✓ |
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Certified by ISO, SGS, and BV
✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars
✅ Custom processing services available – including cutting, polishing, CNC machining, and packaging
✅ Fast delivery within 7-15 days, supported by global logistics partners
📦 Packaging and Shipping
All stainless steel products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
Gnee Steel is a supplier of Inconel 718 alloy, offering a wide range of products including: seamless pipe (sizes: 4-219 mm; thickness: 0.5-20 mm); welded pipe (sizes: 5.0-1219.2 mm; thickness: 0.5-20 mm); plates (thickness: 0.1 to 100 mm; width: 10-2500 mm); strips; alloy round bars (diameter: 3-800 mm); flat bars (thickness: 2-100 mm; width: 10-500 mm); hexagonal bars (size: 2-100 mm); wire rods; and extruded profiles. We collaborate with steel mills to provide our customers with Inconel 718 alloy products that meet or exceed numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS standards.
Gnee Steel stocks and sells Inconel 718, pipes, plates, strips, round bars, flat bars, forged billets, hexagonal steel, wire rods, and extruded profiles. Please feel free to contact us at ss@gneesteel.com for a quote.
