Benton Frisse Posted October 27, 2014 Share Posted October 27, 2014 I was working on some projects yesterday, and I can't help but notice some of the stock I am using is shedding fire scale more than usual. There's quite a bit! When comparing hot rolled vs. cold rolled mild steel, does one produce more fire scale than the other? Thanks! Quote Link to comment Share on other sites More sharing options...
ken leedy Posted October 27, 2014 Share Posted October 27, 2014 Hot rolled starts off with more scale because of the finishing process. Cold rolled starts off cleaner and closer to tolerance. I believe they are the same after that. I may be wrong but that's what I've been told. Quote Link to comment Share on other sites More sharing options...
EricJergensen Posted October 27, 2014 Share Posted October 27, 2014 Right, hot roll always has "mill scale" on it. It's left to save money, but it also protects (slightly) the steel from rusting. So, as ken says, it has some scale to begin with that cold rolled doesn't. But the steel isn't inherently more prone to scale. Quote Link to comment Share on other sites More sharing options...
SJS Posted October 29, 2014 Share Posted October 29, 2014 Cold rolled is often 1018, so it is very mild and uniform, easy to weld and machine. Hot rolled is generally AS36 which is remelt that they really only care about yield strength, people often complain about vast inconsistencies even in the same bar sometimes just inches away... And there are the stories of ball bearings, being found whole inside a bar... People who actually know what they are talking about can correct me;-) YMMV;-) To the original question I haven't noticed a difference... Quote Link to comment Share on other sites More sharing options...
teenylittlemetalguy Posted October 29, 2014 Share Posted October 29, 2014 maybe something changed with the forge? a gasser is awfully sensitive to small changes.a shifted brick or a small amount of wear will suddenly make scale like crazy. I wouldn't know about solid fuels if that is what you are using. Quote Link to comment Share on other sites More sharing options...
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