Comparison of Inconel 600 bolts and Inconel 625 bolts
The main difference between Inconel 600 and 625 bolts lies in their composition, which determines their strength and corrosion resistance. Inconel 625, due to its higher molybdenum and niobium content, is more expensive, resulting in superior high-temperature strength, better corrosion resistance, and fatigue resistance, making it more widely used in environments such as aerospace and marine. Inconel 600, on the other hand, is more economical and ideal for applications requiring high temperatures but less stringent corrosion resistance, such as heat treatment and steam turbines.
What is the difference between Grade 1 and Grade 2 Inconel 625?
Grade 2 Inconel 625 is supplied in the solution-annealed state. The main difference between Grade 2 and Grade 1 is the annealing temperature. The minimum annealing temperature for Grade 1 is 1600°F (871°C), while the minimum annealing temperature for Grade 2 is 2000°F (1093°C).
Inconel 625 bolts are among the most corrosion-resistant Inconel alloys, capable of withstanding the erosion of various strong hot acids. While their corrosion resistance is not as high as Hastelloy C276 bolts, Inconel 625 bolts offer superior high-temperature resistance. Comparing Inconel 600 and Inconel 625 bolts, Inconel 600 is the preferred high-temperature nickel-based alloy, with a maximum temperature resistance of 2000°F (approximately 1093°C), while Inconel 625's maximum temperature resistance is 1800°F (approximately 983°C).
Chemical Composition Of Nickel 600 bolts & 625 bolts
| Properties | INCONEL 625 | INCONEL 600 |
|---|---|---|
| Sulfur (S) | 0 to 0.015 | 0 to 0.015 |
| Carbon (C) | 0 to 0.1 | 0 to 0.15 |
| Aluminum (Al) | 0 to 0.4 | - |
| Manganese (Mn) | 0 to 0.5 | 0 to 1.0 |
| Iron (Fe) | 0 to 5.0 | 6.0 to 10 |
| Molybdenum (Mo) | 8.0 to 10 | - |
| Nickel (Ni) | 58 to 68.9 | 72 to 80 |
| Chromium (Cr) | 20 to 23 | 14 to 17 |
| Niobium (Nb) | 3.2 to 4.2 | - |
| Cobalt (Co) | 0 to 1.0 | - |
| Silicon (Si) | 0 to 0.5 | 0 to 0.5 |
| Titanium (Ti) | 0 to 0.4 | - |
| Phosphorus (P) | 0 to 0.015 | - |
| Copper (Cu) | - | 0 to 0.5 |
Inco 625 bolts vs 600 bolts Properties
| roperties | Annealed Inconel 625 | Solution Treated 625 |
|---|---|---|
| Elongation at Break | 33% | 34% |
| Poisson's Ratio | 0.29 | 0.29 |
| Shear Strength | 600 MPa (87 x 103 psi) | 530 MPa (77 x 103 psi) |
| Yield Strength | 450 MPa (65 x 103 psi) | 320 MPa (47 x 103 psi) |
| Elastic Modulus | 200 GPa (30 x 106 psi) | 200 GPa (30 x 106 psi) |
| Fatigue Strength | 320 MPa (47 x 103 psi) | 240 MPa (34 x 103 psi) |
| Shear Modulus | 79 GPa (11 x 106 psi) | 79 GPa (11 x 106 psi) |
| Tensile Strength: Ultimate (UTS) | 910 MPa (130 x 103 psi) | 790 MPa (120 x 103 psi) |
| Mechanical | 980 °C (1800 °F) | 980 °C (1800 °F) |
| Melting Onset | 1290 °C (2350 °F) | 1290 °C (2350 °F) |
| Thermal Conductivity | 11 W/m-K (6.4 BTU/h-ft-°F) | 11 W/m-K (6.4 BTU/h-ft-°F) |
| Latent Heat of Fusion | 330 J/g | 330 J/g |
| Melting Completion | 1350 °C (2460 °F) | 1350 °C (2460 °F) |
| Specific Heat Capacity | 440 J/kg-K (0.1 BTU/lb-°F) | 440 J/kg-K (0.1 BTU/lb-°F) |
| Thermal Expansion | 13 µm/m-K | 13 µm/m-K |
| Curie Temperature | -200 °C (-320 °F) | -200 °C (-320 °F) |
| Molybdenum | 8.0 to 10 | 8.0 to 10 |
| Iron | 0 to 5.0 | 0 to 5.0 |
| Manganese | 0 to 0.5 | 0 to 0.5 |
| Aluminum | 0 to 0.4 | 0 to 0.4 |
| Carbon | 0 to 0.1 | 0 to 0.1 |
| Sulfur | 0 to 0.015 | 0 to 0.015 |
| Chromium | 20 to 23 | 20 to 23 |
| Niobium | 3.2 to 4.2 | 3.2 to 4.2 |
| Cobalt | 0 to 1.0 | 0 to 1.0 |
| Silicon | 0 to 0.5 | 0 to 0.5 |
| Titanium | 0 to 0.4 | 0 to 0.4 |
| Phosphorus | 0 to 0.015 | 0 to 0.015 |
| Nickel | 58 to 68.9 | 58 to 68.9 |
Comparison: Inconel 600 Bolts vs. Inconel 625 Bolts
| Feature | Inconel 600 Bolts | Inconel 625 Bolts |
|---|---|---|
| Composition | Nickel-Chromium-Iron alloy: approx. 72% Ni, 14-17% Cr, 6-10% Fe | Nickel-Chromium alloy: approx. 58% Ni, 20-23% Cr, 8-10% Mo, 3.15-4.15% Nb |
| Primary Strengths | Excellent oxidation and high-temperature resistance, good workability | Superior high-temperature strength, excellent corrosion resistance (including pitting and crevice corrosion), good fatigue strength |
| Typical Applications | Heat treating, steam turbine equipment, furnace components, chemical processing | Aerospace, chemical processing, marine, offshore, nuclear power plants |
| Cost | Lower cost | Higher cost due to more alloying elements |
| Machinability | Easier to machine | More difficult to machine, requires specialized tooling and slower speeds |
| Corrosion Resistance | Good resistance to oxidation and corrosion | Superior resistance to a wide range of corrosive environments |
Why Choose Gnee Nickel Alloy (Supplier Example)?
✅ Large stock of Incoloy alloy tubes/bars/plates/fittings/coils, fast shipping.
✅ Factory direct sales, highly competitive prices, excellent value for money.
✅ Comprehensive quality assurance: Material Testing Certificate (MTC), chemical composition certificate, and mechanical property certificate.
✅ Value-added services: slitting, cutting, polishing, surface treatment.
✅ Worldwide shipping, secure and reliable packaging, and provision of export-required documents.
Email: ss@gneemetal.com
Gnee Steel is a supplier of Inconel 600/625 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 600/625 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 600/625, 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.
