In the field of nickel-chromium alloys, Inconel 600 and Inconel 601 are often confused due to their similar names and overlapping operating temperature ranges.
However, Gnee Steel, having supplied these alloys to chemical plants in Germany and aerospace contractors in the United States for five years, has witnessed firsthand how subtle differences in aluminum content can result in lifespan differences of several years for furnace components. In this guide, we will compare these two "high-performance alloys" in detail.
1. Chemical composition of Inconel 600 and Inconel 601: The focus is on the aluminum content
| Element | Inconel 600 (UNS N06600) | Inconel 601 (UNS N06601) |
| Nickel (Ni) | Min. 72.0% | 58.0 - 63.0% |
| Chromium (Cr) | 14.0 - 17.0% | 21.0 - 25.0% |
| Aluminum (Al) | - | 1.0 - 1.7% |
| Iron (Fe) | 6.0 - 10.0% | Remainder |
Inconel 600: High nickel content (over 72%), resulting in excellent resistance to chloride stress corrosion cracking (SCC) and alkaline corrosion.
Inconel 601: Sacrifices some nickel content for higher chromium and aluminum content. This combination forms a dense oxide layer that resists peeling even at high temperatures.
2. Mechanical properties of Inconel 600 and Inconel 601
| Property | Inconel Alloy 600 | Inconel Alloy 601 |
|---|---|---|
| Yield Strength (MPa) | 200 – 310 | 250 – 450 |
| Ultimate Tensile Strength (MPa) | 450 – 700 | 550 – 750 |
| Elongation (%) | 30% (min) | 30% (min) |
| Hardness (Rockwell B) | 80-100 | 85-95 |
One-stop supply: Available product forms for Inconel 600 and 625
Seamless Piping: Seamless piping for high-pressure nuclear or chemical pipelines (compliant with ASTM B167/B444 standards)
Sheet: Cold-rolled sheet metal for precision gaskets; hot-rolled thick plate (thickness up to 50 mm) for pressure vessel shells.
Round Bars: CNC machined bright round bars
3. High-temperature performance of Inconel 600 and Inconel 601
| Feature | Inconel Alloy 600 | Inconel Alloy 601 |
|---|---|---|
| Service Temperature | Up to 1,900°F (1,038°C) | Up to 2,100°F (1,149°C) |
| Oxidation Resistance | Good | Excellent |
| Creep Resistance | Moderate | Very good |
4. Inconel Alloy 600 & Inconel Alloy 601 Corrosion Resistance
| Corrosion Type | Inconel Alloy 600 | Inconel Alloy 601 |
|---|---|---|
| General Corrosion | Very good | Good |
| Pitting Corrosion | Good | Very good |
| Stress Corrosion Cracking | Moderate | Excellent |
| Acid Resistance | Good in non-oxidizing acids | Excellent, even in high-temperature environments |
Inconel 600 vs Inconel 601: Which high-temperature alloy is better suited for your project?
Due to its high aluminum and chromium content, Inconel 601 is generally more suitable for high-temperature (>1000°C) and oxidizing/carburizing environments, making it an ideal material for industrial furnaces. Inconel 600, on the other hand, performs well in chemical processing environments with lower strength and higher temperatures, exhibiting high strength, corrosion resistance, and good hot and cold forming properties.
What temperatures can Inconel 600 withstand?
The hot working temperature range for Inconel 600 alloy is 1600 – 2250°F (870 – 1230°C). Heavy-duty working requires temperatures between 1900 – 2250°F (1040 – 1230°C), while light-duty working can be performed at temperatures as low as 1600°F (870°C).
5. Practical Applications
Based on Gnee Steel's 18 years of export experience, typical global sourcing methods are as follows:
Applications of Inconel 600 include:
Nuclear engineering: Steam generator tubes and reactor components.
Chemical processing: Production of titanium dioxide and chlorinated hydrocarbons.
Food processing: Handling organic acids requiring extremely high product purity.
Applications of Inconel 601 include:
Heat treatment: Furnace baskets, distillation kettles, and trays.
Petrochemicals: Catalyst carriers and flare heads in refineries. Power generation: Ash and slag treatment systems and radiant heating tubes.
6. Global Sourcing Intelligence: What I Tell My Clients
When sourcing these alloys globally, "standards" are your best friend.
For the US/Middle East market:
Most inquiries are based on ASTM B166 (bars) or ASTM B167 (seamless tubes). Ensure your suppliers provide complete traceability, including heat numbers.
For the European market:
Look for W.Nr. 2.4816 (600) or W.Nr. 2.4851 (601). They typically require an EN 10204 3.1 certificate as a benchmark.
"Cost" Factors:
Generally, Inconel 600 is slightly more expensive due to its higher nickel content. If your application is purely high-temperature oxidation and does not involve severe chemical corrosion, switching to 601 steel can usually save you 10-15% on material costs.
Why Choose a Professional Supplier?
Understanding the properties of Inconel 600 and 601 requires more than just a price list. You need a partner who understands creep rupture strength, coefficient of thermal expansion, and weld compatibility.
As a professional nickel alloy exporter, we offer:
Strict Chemical Composition Verification:
We use a handheld PMI (XRF) to verify the aluminum and nickel content before each shipment.
Custom Machining:
Whether you need seamless steel tubing, cold-rolled steel sheet, or forged rings, we can meet your needs.
Global Logistics:
We have extensive experience exporting to heavy industry, using rust-proof packaging and sea-ready wooden crates.
Still unsure which alloy is right for your project?
For technical support regarding your project's use of Inconel 600, please contact us
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 Inconel Alloy 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
About Gnee Steel
Gnee Steel is a professional manufacturer of nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy 800, Incoloy 800H/HT, Incoloy 825, Monel 400, Monel K500, and other high-temperature alloy materials. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power generation, automotive, nuclear energy, and other fields, and we can provide customized alloy material solutions according to customer needs. For inquiries about alloy material prices or customized alloy material solutions, please feel free to contact us via email at ss@gneemetal.com for a quote.
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FAQ
Q: What is the temperature range of Inconel 600?
A: Inconel 600 (AMS 5540) is a nickel-chromium alloy suitable for both low and high temperature environments, with a maximum temperature of 2000°F (1093°C).
Q: What is the difference between Inconel 600 and 601?
A: Inconel 600 has excellent tensile strength and resistance to stress corrosion cracking, making it ideal for high-stress environments. Inconel 601 has slightly lower tensile strength, but due to its aluminum content, it has excellent oxidation resistance.
Q: What are the applications of Inconel 601?
A: In industrial furnaces, this alloy is used to manufacture radiant tubes, muffle furnaces, rotary furnaces, flame guards, steel strand annealing tubes, braided conveyor belts, chain curtains, burner nozzles, and resistance heating elements.
Q: What is the operating temperature of Inconel 601?
A: UNS N06601, W.Nr 2.4851. The aluminum content gives this alloy excellent resistance to high-temperature oxidation. Inconel 601 does not have age-hardening capability and can only be strengthened through cold working. The operating temperature range of Inconel 601 is from low temperatures to 645°F (340°C).
Q: Will Inconel 600 rust?
A: The high nickel content of Inconel 600 alloy gives it excellent corrosion resistance, resisting corrosion from a variety of organic and inorganic compounds, and it is virtually free from chloride stress corrosion cracking.
Q: Is Inconel 601 magnetic?
A: Inconel 601 is a non-magnetic nickel-chromium alloy with high-temperature strength comparable to 18-8 alloy and high resistance to organic and inorganic corrosion. Inconel 601 sheets can operate well in a temperature range from low temperatures to 2000°F (1093°C).
Q: What temperature can Inconel 600 withstand?
A: The hot working temperature range for Inconel 600 alloy is 1600 – 2250°F (870 – 1230°C). Heavy-duty processing requires temperatures of 1900 – 2250°F (1040 – 1230°C), while light-duty processing can be performed at temperatures as low as 1600°F (870°C).
