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Differential heat treatment (also called selective heat treatment or local heat treatment) is a technique used during heat treating to harden or soften certain areas of a steel object, creating a difference in hardness between these areas. There are many techniques for creating a difference in properties, but most can be defined as either differential hardening or differential tempering. These were common heat treating techniques used historically in Europe and Asia, with possibly the most widely known example being from Japanese swordsmithing. Some modern varieties were developed in the twentieth century as metallurgical knowledge and technology rapidly increased.
Differential hardening consists of either two methods. It can involve heating the metal evenly to a red-hot temperature and then cooling it at different rates, turning part of the object into very hard martensite while the rest cools slower and becomes softer pearlite. It may also consist of heating only a part of the object very quickly to red-hot and then rapidly cooling (quenching), turning only part of it into hard martensite but leaving the rest unchanged. Conversely, differential tempering methods consist of heating the object evenly to red-hot and then quenching the entire object, turning the whole thing into martensite. The object is then heated to a much lower temperature to soften it (tempering), but is only heated in a localized area, softening only a part of it.
It appears Hardened Arms is out of business. Rumor on Reddit. Website down. FB page no longer there.
Shame as I liked them alot. I have a 16-inch bull barrel and a few 10.5-inch pistol uppers. The bull barrel is crazy accurate. High value IMO.
Tough commodity business right now. Buyers market...
I’m just wanting to get some input/thoughts on pinned & welded suppressors. Hardened arms has a sale going and it has me thinking about ordering the black widow 300BLK version. It’s a single stamp for an SBR in 300. I understand the can is stuck on one rifle but to me, that isn’t a big deal. It...
I am selling/trading a 10.5” complete upper with CH and BCG. This is a lightly used item, that functions flawlessly. Like new condition. It is show ln in photos here and before anyone asks, the suppressor, the RMR, or any lower receiver parts don’t come with it.
NO OPTICS with purchase.
Just saw this the other day and couldn't pass it up. I couldnt find any reviews on the suppressor, but a majority of their other product reviews say pretty great things.
AR15 Stingray (TM) Stainless Steel 5.56 Suppressor