How Inconel is made?
Inconel 601 is a nickel-chromium alloy that has additions of aluminum. These additions increase its resistance to oxidation and various forms of corrosion. This has made Inconel 601 a common material in heat treating equipment, furnaces, and gas-turbine components.

What is Inconel used For?
INCONEL® nickel-chromium alloy 625 (UNS N06625/W.Nr. 2.4856) is used for its high strength, excellent fabricability (including joining), and out- standing corrosion resistance. Service temperatures range from cryogenic to 1800°F (982°C).

Can Inconel be welded?
Inconel filler metals produce a weld pool with a “skin” on the surface that canappear dirty to welders accustomed to steel. This is normal for Inconel. Thesewelds should be strong and highly resistant to corrosion when they are properly made. Weld Inconel with the TIG technique.
What is a Incoloy?
They are mostly nickel-based, and designed for excellent corrosion resistance as well as strength at high temperatures; there are specific alloys for resistance to particular chemical attacks (e.g. alloy 020 is designed to be resistant to sulphuric acid, DS to be used in heat-treating furnaces with reactive atmospheres …
What is Hastelloy material?
Hastelloy C-276 Welding Material. Alloy C276 welding products are used as matching composition filler material for welding C276 alloy wrought and cast products, for dissimilar welding applications including other nickel-chromium-molybdenum alloys and stainless steels, and for weld overlay or cladding of steels.
Is Hastelloy better than stainless steel?
Being all corrosion resistant alloys cost is the most important factor here. SS 316 L is an iron alloy, Hastelloy a nickel alloy and Monel are nickel-copper alloys. Nickel is the most expensive, then copper and finally steel. Typically, unless it is inevitable, you would always use the cheapest, SS 316L.
Monel is a group of nickel alloys, primarily composed of nickel (up to 67%) and copper, with small amounts of iron, manganese, carbon, and silicon. Stronger than pure nickel, Monel alloys are resistant to corrosion by many agents, including rapidly flowing seawater. They can be fabricated readily by hot- and cold-working, machining, and welding.

Monel was created by Robert Crooks Stanley, who worked for the International Nickel Company (INCO) in 1901. Monel alloy 400 is a binary alloy of the same proportions of nickel and copper as is found naturally in the nickel ore from the Sudbury (Ontario) mines and is therefore considered a puritan alloy. Monel was named after company president Ambrose Monell, and patented in 1906. One L was dropped, because family names were not allowed as trademarks at that time. The name is now a trademark of Special Metals Corporation.

It is a very expensive alloy, with cost ranging from 5 to 10 times the cost of copper and nickel, hence its use is limited to those applications where it cannot be replaced with cheaper alternatives. Compared to carbon steel, piping in Monel is more than 3 times as expensive.