What is the difference between nickel 600 and 625?
What is the difference between nickel 600 and 625 Alloy?
Nickel 600 (Inconel 600) is a basic high-nickel alloy used in high-temperature environments, while Nickel 625 (Inconel 625) contains significant additions of molybdenum (8-10%) and niobium, giving it superior strength, oxidation resistance, and broad corrosion resistance (especially against pitting/crevice corrosion). Therefore, it is more suitable for harsh chemical/aerospace applications, even though Nickel 600 has a slightly higher maximum operating temperature and lower cost.
What is the difference between Grade 1 and Grade 2 alloy 625?
Inconel 625 Grade 2 alloy is supplied in the solution-annealed condition. The main difference between Grade 1 and Grade 2 alloys lies in the annealing temperature. The minimum annealing temperature for Grade 1 alloy is 1600°F (871°C), while the minimum annealing temperature for Grade 2 alloy is 2000°F (1093°C).
What is Inconel 600 used for?
Chemical Processing: Inconel 600 alloy is used in the chemical industry for equipment such as heat exchangers, evaporators, and condensers.
Aerospace: Due to its high-temperature strength, Inconel 600 is crucial in aerospace applications. It is used in components such as seals, turbine blades, and exhaust linings in jet engines.
Power Generation: The stability of Inconel 600 alloy under temperature fluctuations and its oxidation resistance make it play a vital role in power plants, particularly in steam generators and reactors.
Nuclear Industry: Nickel 600's resistance to high-purity water corrosion and radiation damage makes it a preferred material for nuclear reactors, control rod mechanisms, and steam generator tubing.
Food Processing: Alloy 600 is commonly used in heating equipment for food processing, where resistance to organic and inorganic acid corrosion is essential.
How much nickel is in Inconel 625?
58%
Inconel 625 is a nickel-based high-temperature alloy known for its high strength, excellent machinability, and outstanding corrosion resistance. This material is primarily composed of nickel (minimum 58%), along with significant amounts of chromium (20-23%), molybdenum (8-10%), and niobium (3.15-4.15%).
What is Inconel Alloy 600?
Inconel Alloy 600 is a standard engineering material suitable for applications requiring corrosion resistance and high-temperature resistance. This alloy also possesses excellent mechanical properties, combining high strength with good workability. Alloy 600 is also known as UNS N06600 and W.Nr. 2.4816. It is a non-precipitation hardening alloy; it can only be hardened and strengthened through cold working.
What is Inconel Alloy 625?
Inconel Alloy 625 is a nickel-based superalloy with a high nickel content, significantly higher than other grades of alloys. It exhibits high strength and high electrical resistivity even at extreme temperatures. It has proven to be highly resistant to corrosion and oxidation. These properties make it very useful in marine and nuclear environments.
Alloy 625, also known as UNS N06625 and W.Nr. 2.4856, is a solid-solution alloy strengthened by nickel, thus possessing high corrosion resistance, high tensile strength, high oxidation resistance, and excellent fatigue properties.
These characteristics of Alloy 625 make it an ideal material for manufacturing chemical equipment, aerospace structural components, and aircraft engine parts.
Inconel Alloy 600 vs Inconel Alloy 625 Chemical Composition
| Element | Inconel 625 | Inconel 600 |
|---|---|---|
| Nickel (Ni) | 58-63% | 72-76% |
| Chromium (Cr) | 20-23% | 14-17% |
| Iron (Fe) | Balance | Balance |
| Molybdenum (Mo) | 8-10% | None |
| Niobium (Nb) | 3.0-4.0% | None |
| Carbon (C) | ≤0.10% | ≤0.15% |
Mechanical properties of Inconel 600 and Inconel 625
| Property | Inconel 625 | Inconel 600 |
|---|---|---|
| Yield Strength (MPa) | 280 – 345 | 200 – 310 |
| Ultimate Tensile Strength (MPa) | 700 – 1,200 | 450 – 700 |
| Elongation (%) | 30% (min) | 30% (min) |
| Hardness (Rockwell B) | 40-50 | 80-100 |
High-temperature properties of Inconel 600 and Inconel 625
| Feature | Inconel 625 | Inconel 600 |
|---|---|---|
| Service Temperature | Up to 1,800°F (982°C) | Up to 1,900°F (1,038°C) |
| Oxidation Resistance | Excellent | Good |
| Creep Resistance | Very good | Moderate |
Corrosion Resistance Comparison of Inconel Alloy 600 and Inconel Alloy 625
| Corrosion Type | Inconel 625 | Inconel 600 |
|---|---|---|
| General Corrosion | Excellent | Very good |
| Pitting Corrosion | Excellent | Good |
| Stress Corrosion Cracking | Excellent | Moderate |
| Acid Resistance | Good in moderate acidic environments | Very good in non-oxidizing acids |
Nickel alloys, due to their nickel content, possess excellent corrosion resistance. This characteristic is fully demonstrated in alloys such as 600 and 625.
Compared to alloy 600, alloy 625 contains a higher proportion of chromium. This chromium content is crucial for the alloy's oxidation resistance. Therefore, alloy 625 exhibits superior oxidation resistance compared to alloy 600.
Alloy 600 does not contain molybdenum, while alloy 625 contains over 8% molybdenum, which gives alloy 625 a certain degree of resistance to reducing environments, a characteristic that alloy 600 lacks.
From the above comparison, it can be seen that alloy 625 performs better in terms of overall corrosion resistance.
Main standard comparison between Inconel 600 alloy and Inconel 625 alloy
| Product Form | Inconel Alloy 600 Standards | Inconel Alloy 625 Standards |
|---|---|---|
| Condenser and Heat Exchanger Tube | ASTM B163 | – |
| Seamless Pipe | ASTM B167, ASTM B829 | ASTM B444, ASTM B829 |
| Welded Tube | ASTM B516, ASTM B751 | ASTM B704, ASTM B751 |
| Welded Fittings | ASTM B366 | ASTM B366 |
| Round Rod & Bar | ASTM B166 | ASTM B446 |
| Forgings | ASTM B564 | ASTM B564 |
| Plate, Sheet, Strip & Foil | ASTM B168, ASTM B906 | ASTM B443 |
Why Choose Gnee Nickel Alloy (Supplier Example)?
✅ Large stock of Inconel 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 also supplies custom Inconel 600 products in various sizes and specifications. Please send us your drawings for a quote!
