What is the difference between Hastelloy and Monel alloy？

What is Hastelloy？

Hastelloy is a nickel-based alloy with a face-centered cubic structure. It is considered a universal anti-corrosion alloy, especially resistant to corrosion by hydrogen chloride, chlorine, and hypochlorous acid. It is mainly divided into nickel-chromium alloy and nickel-chromium-molybdenum alloy. Hastelloy has extremely low carbon content, which can minimize the precipitation of carbides during welding. It is a high temperature resistant and corrosion resistant alloy material, which has higher strength than standard alloy materials. Due to its excellent oxidation resistance, long-term thermal stability, and processability, it is widely used in harsh industrial environments such as agricultural chemicals, nuclear facilities, biopharmaceuticals, paper industry, and aerospace applications.

What is Monel alloy？

Monel alloy is a nickel-copper alloy with a single-phase austenite structure, mainly composed of nickel (52% to 67%) and copper, and contains a small amount of iron, manganese, carbon, and silicon. Monel alloy is a kind of corrosion-resistant alloy with a large dosage, wide application, and excellent comprehensive performance. It has excellent corrosion resistance in fluorine gas, hydrochloric acid, sulfuric acid, hydrofluoric acid, and its derivatives. It has good mechanical properties, medium to high strength, a wide range of use temperatures from low to high temperatures, and good welding performance.

Difference between Hastelloy and Monel

★ Grade：

★ Element：

Hastelloy materials include nickel, molybdenum, chromium, cobalt, tungsten, vanadium, aluminum, titanium, niobium, iron, copper, carbon, and other elements. Monel is a nickel-copper alloy, mainly containing nickel and copper, but also silicon, manganese, carbon, and iron.

★ Application：

Hastelloy has good corrosion resistance and high temperature resistance, and has a certain degree of radiation resistance. It has very large applications in the nuclear power industry and the strong acid corrosion industry. It is particularly resistant to the corrosion of hydrogen chloride, chlorine and hypochlorous acid, and is also mostly used in aviation, chemical industry chlor-alkali and other fields.

Monel alloy is non-magnetic, high strength, good ductility, good weldability, and good corrosion resistance. Conventional processes (hot rolling, forging, annealing, etc.) have little effect on its permeability. It can be used in some vacuum devices to manufacture parts that require non-magnetic and strong reducing corrosion media. For example, in the production of acids, Monel alloy materials are more suitable. Monel alloy is particularly resistant to hydrogen fluoride and fluorine corrosion. It is mostly used in oil refining alkylation devices, hydrogen fluoride and fluorine equipment, thermoelectric transmission materials, electronic components, and pressure resistance. Wear-resistant structural parts, etc.

★ Price：

The price of Hastelloy alloy is higher than that of Monel alloy. On the one hand, due to the composition, the price of different raw materials will be different. On the other hand, the production method of Hastelloy is much more complicated than Monel, so the overall cost is higher than Monel. But compared with ordinary stainless steel materials, Monel alloy is also very expensive.

★ Melting point：

Hastelloy and Monel have similar melting points, but Hastelloy grades have higher heat resistance than Monel. The melting point of most Monel alloys is approximately 2460 degrees Fahrenheit. Hastelloy grades have a slightly higher melting point, approximately 2550 degrees Fahrenheit. According to different grades and material composition, it is slightly different.

★ Color：

Brand new metal products are difficult to identify when they are polished and have the same surface color. Nickel alloys, including Hastelloy, are silver, and the edges of Monel alloy have a slight yellow-green tone.

★ Yield Strength：

The yield strength of Hastelloy is as high as 364MPa. The yield strength of Monel alloy grades is as high as 345MPa.

★ Ultimate tensile strength：

The minimum tensile strength of Monel alloy is as high as 620MPa, and the minimum tensile strength of Hastelloy alloy is as high as 826MPa.

How to distinguish Hastelloy and Monel alloy？

Although metals have a lot in common in appearance, obtaining a rolling mill test report or a material test report is one of the most effective ways to distinguish them. In most cases, manufacturers can obtain MTR or factory test reports for the buyer as an effective measure to ensure product quality. Generally, a material test report is a complete test report on the element composition of the material and its mechanical or physical quality.

Forms of Hastelloy and Monel

Both alloys can be processed into bars, plates, elbows, flanges, pipe fittings, fasteners, etc., and can also be customized according to customer needs.

Wudenalloy has focused on the production and manufacture of nickel alloys for more than ten years. We are a principal worldwide supplier of corrosion-resistant alloy and other superalloy metals. We have a professional technical team and after-sales service, so we can offer high-quality Hastelloy®, Incoloy®, Inconel®, Monel®, Duplex Stainless Steel and other alloy material. These materials are available in bar, sheet&plate, pipe&tube, flange, forging, and other forms to meet the needs of our customers. you can send emails to sales@wudenalloy.com at any time, Wudenalloy is your trusted supplier of special alloy material.