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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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What do you guys know about Decarb of steel?
Ed Huntress wrote:
In general, it's the result of heating carbon steel in air -- the hotter you get the steel, the worse the condition is. Heating it above transition temperature (Curie point) without protection from oxygen in the air will start decarb immediately. The carbon combines with the oxygen. The higher the temp and the longer the part soaks at high temperature, the worse it gets. Right on the money, EH. Plain high-carbon steels (W1; music wire; AISI/SAE 1070 and above) are the worst offenders. High-alloy steels, in general, present less of a problem. Ed Huntress Yeah but. LOL Except high alloy steels have the worst reputation for reasons you gave in the first part tho. The high alloy steels need longer soak times at higher temperatures and so cook off more of their carbon. W1 etc many times can be heated quickly and quenched. But yeah, even heated and quenched quickly there's still a reduced carbon layer of some sort when using my propane burners. In my case it's expected and I just grind it off but also I'd grind it thinner anyway since a thin knife blade cuts most stuff better. With my gun and knife springs made from 1095 or O1 the thin reduced carbon layer doesn't seem to effect anything. ?? Alvin in AZ |
#2
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What do you guys know about Decarb of steel?
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