Inconel 625 plate

Difference between Inconel 625, Incoloy 330 and Inconel 600 (HY-marketing departmentes)

Inconel series superalloys:

Inconel 625 plateYou may be familiar with Inconel high nickel alloy series. This series of alloys is known for its performance under extreme thermal conditions, which makes each Inconel alloy variant very popular in furnace applications (such as heat treatment or annealed steel). However, what are the differences between Inconel nickel alloy series products? This is a question frequently asked by HY-Industry salesmen. Below we summarize the application of the three materials:

  • Incoloy330: Although it is part of the Inconelmoyanalloy heat-resistant metal alloy series, the more common name of 330 is Incoloymoyanalloy or RA330. Since the nickel content is between 34% and 37% and the chromium content is between 17% and 20%, Incoloymoyanalloy has incredible resistance to oxidation at high temperatures below 1148°C and has carburizing and nitriding capabilities.The rapid temperature change (common in heat treatment applications) is not a big problem for the 330 alloy because it resists thermal shock. Like many Inconelmoyanalloy alloys, 330 maintains a large degree of tensile strength at extreme temperatures compared to ordinary steel alloys.In fact, in the alloy performance guide, the rolled alloy lists RA330 as having excellent performance in terms of strength, oxidation resistance, carburization resistance and sulfur oxidation resistance, and is rated as the most high-temperature alloy it provides Good thermal shock resistance.

  • inconel600: inconel600 is a very popular high temperature resistant and oxidation resistant material. At a minimum nickel content of 72%, the nickel content of this metal alloy is more than twice that of Incoloy 330.Although this helps improve the high temperature oxidation resistance and carburization resistance of the metal, it does make the metal susceptible to sulfur attack. As described in the rolling alloy guide, inconel 600 is used for oxidizing sulfur, reducing sulfur, or molten metals (such as copper, zinc, or magnesium). But it does have good tensile strength, above-average oxidation resistance and thermal shock resistance, and first-class carburization resistance. If the stress is relieved, it also has incredible resistance to chloride stress corrosion cracking.

  • Inconel625: In terms of nickel content, Inconel625 is between 330 and 600 alloys, with a minimum nickel content of 58%. The chromium content is between 20 and 23%, which is the element in the alloy second only to nickel. The addition of niobium and molybdenum can improve the performance of the alloy at different temperatures, which is why Inconel600 has excellent strength and toughness in the temperature range of 0°C to 1093°C.This alloy also has particularly high creep rupture strength, fatigue resistance and resistance to chloride pitting/crevice corrosion. At the same time, this metal is very easy to weld compared to other Inconel nickel alloys. The recommended uses of this metal include jet engine exhaust pipes, flare stacks, seawater equipment and chemical plant equipment because of its high chemical resistance and temperature resistance.In the corrosion test of the rolled alloy, the resistance of Inconel 625 to oxalic acid is particularly high compared to other materials. In a 10% boiling solution of oxalic acid, the material only experienced 6.0 mils/year of corrosion. In contrast, 316L stainless steel experienced 44.9 mils/year corrosion in the same solution. However, its resistance to sulfuric acid is not so impressive, with corrosion of 37 mils/year in a 10% concentration bath.

So which material is best for your needs?

Inconel 625-2Shanghai HY-Industry advises you: the selection of materials depends on your application process. If there are chemical substances, what will be involved? Inconel 600 has good temperature resistance, but does not exceed Incoloy 330, which is completely unsuitable for any application involving the use of sulfuric acid compounds. At the same time, 330 has good resistance to sulfur oxidation, but does not reduce the sulfur content. Inconel 625 is generally resistant to most acids, but it is more expensive than the 330 alloy with a lower nickel content.

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