Hastelloy vs Monel

 

Hastelloy vs Monel

What is hastelloy?

Hastelloy is one the most versatile alloys to be used in many in many industrial applications. The material composition has chromium, carbon, cobalt, tungsten, molybdenum, vanadium, aluminum, titanium, niobium, iron, copper, nickel and other elements. There are different grades of hastelloys that have different composition. Some of the grades are Alloy C, C4, B, B2, C276 and so on. Monel on the other hand is a nickel copper alloy that has prominently nickel and copper in the composition with silicon, manganese, carbon, and iron.

Hastelloy Applications

Hastelloy is useful in many different applications in the below listed categories

- Chemical Industries

- Oil & Gas Industries

- Pharmaceutical Industries

- Petrochemical Industries

- Geothermal

- Water Desalination

- Sea Water

- LNG (Liquefied Natural Gas)

- Nuclear Power

- Mining

- Biomass

- Solar Power

Hastelloy Properties

Hastelloy is a nickel-molybdenum alloy that is especially suited to handle reducing acids at concentrations and high temperature. Since it is not affected to grain-boundary carbide precipitation following welding It can be used in the welded condition.

What is Monel?

Monel is primarily composed of 52-67% of nickel and copper, with little amount of silicon, manganese, iron and carbon. It is a group of nickel alloy and it is stronger than pure nickel. Monel alloys are corrosion resistant by many means, including fast flowing seawater. It can be readily fabricated by cold and hot working, welding and machining.

Monel Applications

Monel is useful in many different applications in the below listed categories

- Aerospace applications

- Marine applications

- Musical instruments

- Oil production and refining

Monel Properties

Monel work-hardens very quickly is very difficult to machine, as compared to steel and monel. It requires to be worked and turned at low feed rates and slow speeds. It is usually used in highly corrosive conditions applications. As compared to stainless steel, monel is much expensive. Monel alloy 400 is considerable for its toughness, which is maintained over a sustainable range of temperatures.  At subzero temperature monel alloy 400 provides excellent mechanical properties. Its hardness and strength increases with impact resistance and slight impairment of ductility. Even when it is cooled to the temperature of liquid hydrogen it does not undergo a ductile-to-brittle transition.

Difference Between Hastelloy And Monel Material Price

The Hastelloy materials are more expensive than monel due to the composition. Although the primary reason for the cost is the raw material consumption, the production methods for hastelloys are also sophisticated and add up to the price. Monel is also expensive compared to ordinary stainless steel materials but is cheaper compared to the Hastelloy grades.

Nickel Content In Hastelloy And Monel

The nickel content in Monel grades range up to 67% where the copper content can range up to 60% in cupronickel grades. The Hastelloy grades can contain up to 71% nickel in the composition with high molybdenum up to 16%, chromium up to 22% and other elements as well. This is what makes the material stronger and corrosion resistant than most other alloys.

How To Identify Hastelloy And Monel

It is difficult to identify brand new metallic products from each other when they are polished and have the same surface coloration. Nickel alloys including Hastelloy have a silvery coloration where the Monel can display a yellowish green tinge or hue on the edges. However, the best way to identify each other separately is to look at the unified number systems (UNS) which would designate them separately.

Hastelloy And Monel Melting Point

Hastelloy and monel grades have similar melting points up to 1350 degrees Celsius. However, there are slight difference based on the grade and the material composition. Although the melting points are similar, the heat resistance capacity of Hastelloy grades is higher than that of the monel grades.

Hastelloy And Monel Yield Strength

Hastelloy has yield strengths up to 364MPa. The monel grades have yield strengths up to 345MPa. So the Hastelloy grades are generally stronger than the monel grades.

Monel And Hastelloy Ultimate Tensile Strength

The tensile strength of the Monel grades are also lower than that of the Hastelloy grades. The monel has up to 620MPa minimum tensile strength where the Hastelloy has up to 826MPa minimum tensile strength.Both the materials are used in medical equipment, material handling, compressors, petrochemical industries, packaging, architectural designs, mining equipment, fluid processing equipment, marine and aerospace applications as well. Specific grades are preferred for unique applications.