The original Inconel alloy was coded 600 and consists of >72% nickel, 14&#;17% chromium, 6&#;10% iron, and ~1% manganese, plus traces of copper, silicon, carbon, and sulfur. Constituents vary in proportions, and other alloys contain: molybdenum, niobium, tantalum, cobalt, aluminum, titanium, lead, and boron at various levels.
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All of the Inconel alloys are of high strength. Inconel 718, one of the higher-strength superalloys, delivers around 1,375 MPa of tensile strength and yield strength of around 1,100 MPa. Precipitation-hardened stainless steels can achieve tensile strengths of 850 MPa to 1,700 MPa and yield strengths of 520 MPa to over 1,500 MPa. However, precipitation-hardened stainless steels degrade fairly rapidly in strength above 650 °C, whereas Inconel 718 generally maintains its strength to over 1,000 °C.
Some use case examples of Inconel are listed below:
There is a huge array of Inconel-type alloys (not including Incoloy® and Hastelloy®). The different types are listed below:
This is the original alloy. It is heat- and corrosion-resistant, noted for elevated temperature corrosion/oxidation resistance, good hot and cold processing characteristics, good low-temperature strength, and both hot/cold fatigue properties. It offers high strength under 650 °C, and it&#;s suitable for chemical-plant components.
This alloy has excellent oxidation resistance at elevated temperatures and high resistance to carburization. It is good for high-temperature organic-chemical plants. It resists oxidation from sulfur atmospheres and has good mechanical properties at room temperature and high temperature. It also has great stress corrosion crack resistance because of the low carbon content and fine grain structure. It has particularly good creep strength at elevated temperatures (above 500 °C, at which other alloys can fail). 601GC is the grain-controlled version of the alloy, offering some enhancement of properties over 601.
This alloy offers better corrosion resistance than 600 and 601. It has better performance in retaining strength and resisting creep from low temperatures up to a maximum service temperature of 980 °C
This alloy is suited to precipitation hardening. It offers good strength and toughness up to 650 °C and good general corrosion/oxidation resistance at all service temperatures. It is formulated for solution treatment or precipitation hardening.
This alloy offers elevated corrosion resistance and oxidation resistance, as well as good strength below 980 °C. In addition, Inconel X-750 has good low-temperature performance and molding performance. It is mainly used for aerospace and industrial gas turbine components.
This alloy offers greater resistance to chloride corrosion (e.g., salt water), high temperature/pressure water stress corrosion, strong oxidation environments, and fluorinated atmosphere attack. It is mainly applied in nitric acid environments, steam generators, and nuclear waste treatment plants.
This alloy has an elevated aluminum content which improves the high-temperature corrosion resistance. It is best suited to gas turbine blades and combustion chamber parts for chemical rockets.
All Inconel alloys are rated as offering good resistance to corrosion in normal environments and at moderately elevated temperatures. Some offer more extreme corrosion resistance properties in terms of fluorinated atmospheres, nitric acid, high-temperature combustion environments, etc.
While Inconel is not an easy group of materials to machine, with good tooling and cooling, great results and moderate cut depths and feeds can be maintained. Listed below are some helpful tips to follow:
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For more information, see our guide on Types of Machining Processes.
Inconel is hard to weld, as there is a strong tendency to crack at the welds. The use of TIG and Inconel 625 filler rods gives the best results when executed by automated welding equipment.
Pricing is very dependent on the alloy type and the form in which it is delivered. As a rule, a tube is more expensive than a plate or bar. Solutionized is the normal delivery state, and prices start at around $40 per kg of stock product.
Inconel&#;s hardness varies, depending on how it is processed. Cold-rolled Inconel has a hardness of 175&#;240 Brinell. Annealed varieties, on the other hand, have a hardness of 145&#;220 Brinell. Solutionized, the hardness falls further to 116&#;194 Brinell. For more information, see our guide on Hardness (Durometer).
Most Inconel alloys melt at around 1,400 °C, similar to generic stainless steels.
Two basic forms of heat treatment are used on Inconel alloys. These are:
It depends. Some Inconel alloys respond well to solution hardening. Inconel 725 offers the highest strength of alloys treated in this way.
Yes, Inconel is stronger than titanium. Inconel 718 has a tensile strength of 1,375 MPa while Ti-6Al-4V titanium alloy (highest-strength type), has a tensile strength of around 1,170 MPa. While this is lower strength than the strongest Inconel alloys, a wider range of properties may need to be considered in material selection. For more information, see our guide on Everything You Need to Know About Titanium Anodizing.
This article presented Inconel, explained what it is, and discussed how its made and its various uses. To learn more about Inconel, contact a Xometry representative.
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