May. 06, 2024
Overview
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Inconel 600 and Inconel 601 are very common superalloys. Both alloys have good high temperature properties. Among them, Inconel 601 added more chromium on the basis of Inconel 600. So their main difference is the difference in antioxidant properties.
In this article, we will compare the similarities and differences between the two alloys in several aspects.
Basic Information
Inconel 600
UNS N06600
W.Nr. 2.4816
INCONEL®
Nickel
Chromium
Iron
Solid Solution
Strengthened Alloy
8.47 g/cm³
High Temperature
Inconel 601
UNS N06601
W.Nr. 2.4851
INCONEL®
Nickel
Chromium
Iron
Solid Solution
Strengthened Alloy
8.11 g/cm³
High Temperature
Introduction
INCONEL® (nickel-chromium-iron) alloy 600 (UNS N06600 / W.Nr. 2.4816) is a standard engineering material for applications which require resistance to corrosion and heat. The alloy also has excellent mechanical properties and presents the desirable combination of high strength and good workability.
INCONEL® nickel-chromium-iron alloy 601 (UNS N06601 / W.Nr. 2.4851) is a general-purpose engineering material for applications that require resistance to heat and corrosion. An outstanding characteristic of INCONEL alloy 601 is its resistance to hightemperature oxidation.
Chemical Composition
600
601
600
601
600
601
600
601
600
601
600
601
600
601
600
601
600
601
Purity
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600
601
600
601
600
601
From the composition above, it can be seen that Inconel 600 and Inconel 601 have the same standards for sulfur, silicon and manganese control. Sulfur, silicon and manganese are in most cases harmful elements for superalloys. They greatly affect the instantaneous and creep properties of the alloy. The purity of both alloys is very good, with the same level of instantaneous performance and creep performance.
Corrosion Resistance
Corrosion Resistance
Oxidation Resistance
600
601
600
601
600
601
As can be seen from the composition, the nickel content of Inconel 601 is less than that of Inconel 600. In contrast, it has more chromium content. And added some aluminum elements.
Nickel element can play a very good role in corrosion resistance of alloys. However, this anti-corrosion effect has relatively limited resistance to oxidative environments.
Chromium is a very good antioxidant element. Chromium can form an oxide film on the surface of the metal when it is in contact with oxygen. This oxide film hinders further oxidation of the alloy. This is why chromium is added to almost all superalloys.
The large amount of chromium in Inconel 601 ensures that its oxidation resistance (especially high temperature oxidation resistance) is much better than that of Inconel 600. The added aluminum element can also increase the oxidation resistance of the alloy. The graph below shows a comparison of the antioxidant properties of Inconel 600 and Inconel 601.
Figure 1
Results of cyclic oxidation tests at 2000°F (1095°C). Cycles consisted of 15 min heating and 5 min cooling in air.
Mechanical Behavior
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Both Inconel 600 and 601 are solid solution strengthened alloys. With the exception of nickel, chromium, and aluminum, the chemical compositions of the two alloys are virtually indistinguishable. Therefore, in the same state (solution treated), the mechanical properties of the alloys are almost the same. There isn't any noticeable difference.
Physical Properties
Physical properties of alloy 600 and alloy 601 Inconel 600 Inconel 601 Density, g/cm³ 8.47 8.11 Density, lb/in.³ 0.306 0.293 Melting Range, °F 2470-2575 2480-2571 Melting Range, °C 1354-1413 1360-1411 Permeability at 200 oersted (15.9 kA/m) 1.010 1.003 Curie Temperature, °F -192 <-320 Curie Temperature, °C -124 <-196Application
Because Inconel 601 focuses on improving the oxidation resistance of the alloy, its other corrosion resistance is not as good as Inconel 600. This also leads to the general application of Inconel 601 in some specific situations, and its application range is not as good as that of Inconel 600.
Supported Products
Main Standards
Condenser and Heat Exchanger Tube: ASTM B163
Seamless Pipe and Tube: ASTM B167, ASTM B829
Welded Pipe: ASTM B517, ASTM B775
Welded Tube: ASTM B516, ASTM B751
Welded Fittings: ASTM B366
Rod, Bar, and Wire: ASTM B166
Forgings: ASTM B564
Plate, Sheet, and Strip: ASTM B168, ASTM B906
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Seamless Pipe and Tube: ASTM B167, ASTM B829
Welded Pipe: ASTM B775
Welded Tube: ASTM B516, ASTM B751
Welded Fittings: ASTM B366
Rod, Bar, and Wire: ASTM B166
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Plate, Sheet, and Strip: ASTM B168, ASTM B906
Price
LOW
high
In theory, the Inconel 600 and Inconel 601 cost about the same. But Inconel 600 is more widely used and there are more materials circulating on the market. This makes the Inconel 600 less expensive. So if the Inconel 600 is sufficient for your needs, you may consider using it first.
Conclusion
Inconel 601 is better than Inconel 600 in terms of antioxidant properties. In other respects, there are no more differences between the two.
Inconel 600 has a wider range of applications and is therefore more common.
We manufacture high quality Inconel 600 and Inconel 601 products. If there is a need, please do not hesitate to contact us.
Alloy 601 can be used in a variety of applications including:
Alloy 601 should be welded with a matching composition filler wire. In addition, the weld products developed for RA 602 CA® can provide a stronger weld with higher oxidation resistant than alloy 601.
To learn more about alloy 601 contact us, or fill in our online quote form and we’ll get back to you.
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