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An example of metal spalling  RSS feed

Posts: 1273
Location: latitude 47 N.W. montana zone 6A
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Hi All ;  Wanted to show an example of how only medium high heat can spall metal.  The "peter " channel for my J tube is on its 3rd season.  This was brand new 3/16 carbon steel.  By the end of last season it was looking warped... A few months into this season and it looks BAD.  Temperature on the plate just as it end is rite around 1000 F + , temp in the burning bottom of firebox was over 1500 F . Inside the burn tunnel and coming up the riser, I can easily see how the temps are getting in the 1800 F + range .  If 1000F did this to my air channel what would 1800 F + due to a metal core or riser ...  well my guess is the same thing it did to my plate steel only twice as fast...  Yes metal will hold up for a season .... maybe even two, but ultimately it will fail. Build your core out of fire bricks or clay/perlite but do not build it out of steel or it will not last.  The last photo's show just wood just sitting in the hot J tube and hitting 456 F and spontaneously igniting !   
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1500 F
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looking rough
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456 Fahrenheit... bursting into flame
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2 minutes later the dragon roars again !
Yeah. What he said. Totally. Wait. What? Sorry, I was looking at this tiny ad:
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