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scrap yard stainless

Posted by richard orr 
scrap yard stainless
November 24, 2011 11:03PM
Most stainless harvested from a scrap yard comes from the food processing industry . Does anybody know what type of stainless this tends to be and what it's heat qualitys are in regards to fire box lining?
Re: scrap yard stainless
November 25, 2011 03:33AM
Richard
Kitchen grade stainless steel generally for the cheaper stuff is 304 also called 18/8 then you get a little better grade with 316, and high quality with 316L

For a combustion chamber you want 310 also known as combustion grade stainless, made for high temperature environment. $$$$

Iron is the base material for stainless steel. 316 stainless steel contains more iron than 310 stainless steel, but both are made up of well over 50 percent iron. Grade-316 stainless steel contains approximately 12.5 percent nickel, 17 percent chromium and 2.1 percent molybdenum. Grade-310 stainless steel is comprised of between 24 and 26 percent chromium and between 19 and 22 percent nickel. Grade-310 stainless steel contains a maximum of 0.25 percent carbon while grade-316 stainless steel contains a maximum of .08 percent carbon.
TH
Re: scrap yard stainless
November 28, 2011 12:01AM
Richard,
See if a magnet sticks to it. If it does, it's a 400 series. If it doesn't, it's probably 304, possibly 314L. If it doesn't stick, and they will sell it for less than a buck a pound, grab it. Either series will last longer than carbon steel, but build your design for eventual replacement.

Actually, 309 is a good one for high temp. Not much on high temperature strength, but it will oxidize slower than most others. Problem is, it isn't usually used in the food industry.

Tom
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