Nickel 200/201

Nickel 200 and 201 are highly sought after for their exceptional corrosion resistance across a range of environments. According to recent sources, they perform admirably in reducing and neutral atmospheres, as well as in oxidizing conditions that permit the formation of a passive oxide layer. This oxide layer is crucial for their resilience in caustic environments, resulting in very low corrosion rates in both marine and rural atmospheres. Additionally, they exhibit excellent resistance against corrosion from both distilled and natural waters and provide reliable service in flowing sea water, even at high velocities. However, stagnant or low-velocity conditions may lead to significant local attacks under fouling organisms or deposits. In hot water systems containing a mixture of carbon dioxide and air, initial corrosion rates may be elevated, but they tend to decrease over time as a protective film forms.

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Nickel 200 is typically limited to service at temperatures below 600°F. At higher temperatures, the risk of graphitization can severely compromise its properties. When operating conditions exceed 600°F, the carbon content is critical, making Nickel 201, with its lower carbon content, more resistant to graphitization and less prone to embrittlement. Both Nickel 200 and 201 are certified for the construction of pressure vessels and components in accordance with ASME Boiler and Pressure Vessel Code Section VIII, Division 1. Nickel 200 is approved for service up to 600°F, while Nickel 201 is suitable for higher temperatures. The melting point for both grades is also noteworthy.

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I hear you... Bob Engnath used to handle most of the twisted nickel material that Jim Furgerson created, and they were good friends. Back then, 15N20 wasn't well known, so we worked with what was available. Interestingly, nearly all of the Damascus steel I encountered wasn't used much, but it did present a unique visual—a minuscule gap only visible under a microscope—creating the illusion of stacking hundreds of razor blades with a nickel spacer. Just for reference, Bob Engnath has likely processed over 30,000 knives, and he had the remarkable ability to turn a blank piece of steel into a great katana in less than 30 minutes. I truly miss him and Stefaney, though I heard she's in NY... I wish I could find her. There weren't many people better than Bob Engnath...

By the way, I know I'm sort of dating myself here... after losing over $300K in San Diego, I was fortunate to retain my tools and equipment, which were in storage for a time, but now they finally have a permanent home that I own. I'm a bit rusty, but the knowledge I have should still serve me well, even though I'm intrigued by new ideas like 15N20. With support from kind folks like you and Randy, I hope to get back into it soon.

When I was bladesmithing in Southern California, only a handful were making knives, and most were farriers. I was the sole bladesmith in that area, especially after Jim Hsisrioulas relocated to Nevada... I know you know Burt Gaston; he was my anvil mate at ABS School in '88. In my Damascus class alongside Bill Moran was Tim Hancock. Most of those who really stuck with it are now Master Smiths or highly regarded. I just managed to keep my skills sharp when I could, and hopefully, soon I'll start rolling again.

As for your opinion, what are your thoughts on the nitrogen quenching methods being used for heat treating?

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