One of the best available nickel-based steel alloys for corrosion resistance is called Hastelloy bar. Hastelloy has a special combination of characteristics that make it far more corrosion resistant than conventional alloys. The Hastelloy family of chromium, nickel, and molybdenum alloys is well suited for use at elevated temperatures in extremely abrasive chemical environments.
Properties of Hastelloy
The nickel-molybdenum alloy known as Hastelloy is made to tolerate both high temperatures and reducing acid concentrations. Since it is not impacted by grain-boundary carbide precipitation, it is not harmed by it after welding. Even if it is welded, it can still be used.
Nickel and copper make up between 52 and 67 percent of monel’s composition, with just trace amounts of silicon, manganese, iron, and carbon. It is a specific form of nickel alloy that resists corrosion better than pure nickel. In a range of conditions, including swift seawater, Monel bar alloys are corrosion-resistant. It can be made by machining, welding, cold and hot working, and welding.
The Monel Properties
Monel work hardens more quickly and is more difficult to process when compared to steel and monel. Low feed rates and modest rotational speeds must be used when working with it. It is frequently used in applications where the surroundings are very caustic.
Compared to stainless steel, Monel is significantly more expensive. The toughness of Monel alloy 400 is noteworthy since it can be maintained throughout a broad temperature range. The mechanical properties of Monel alloy 400 are exceptional at subzero temperatures. Its hardness and strength are increased by impact resistance and a slight loss of ductility. Even when cooled to the temperature of liquid hydrogen, it does not change from ductile to brittle.
Hastelloy and Monel alloys: Differences
The malleable metal monel is stronger than steel and resists corrosion. Apart from resisting alkali media well, this alloy group also resists hydrofluoric and sulfuric acids that are highly corrosive. Copper content makes monel ideal for maritime engineering applications because of its high copper content. Components made from monel are resistant to biofouling because of their copper content. Contrarily, Hastelloy is resistant to acidic solutions.
How are Hastelloy and Monel Recognized?
Even though metals look very similar to one another, one of the best methods to tell them apart is by getting a mill test report or a material test report. In most cases, manufacturers can get a mill test report (MTR) for the buyer as a way to guarantee the quality of the product. In general, a material test report covers all aspects of the test, including the material’s mechanical and physical properties.
Monel and Hastelloy’s melting points:
Contrary to pure metals, some alloys don’t all have the same melting point. These alloys do, however, have a melting range or point. At these temperatures, the material or alloy is a mixture of solid and liquid states. This combination of phases is known as slush. The majority of Monel alloys melt at about 2460 degrees Fahrenheit. Around 2550 degrees Fahrenheit is the melting point of Hastelloy grades, which is slightly higher.