Post by grahamo on May 9, 2009 22:12:50 GMT
Some internet reading last night on the chemical reations in coal burning suprised me. Talk of a chlorine content of 0.4% or even 1% by weight (in "saline" coals) can be found. Another reation produces sulphur dioxide (cause of acid rain and not good for lower grades of St/St.)
There are a few articles floating around, a presentation at www-acerc.byu.edu/News/Conference/2003/Presentations/Tree.pdf looks to be relevant but lacks much in the way of context.
I was trying to understand the preference for 2205 over the french advice for 316L st/st which is much simpler to work, Given these chemicals I think I now understand, and unfortunately (as I work with 316 in the day job) have concluded that 2205 is probably the rignt choice for a coal fired boiler, but the difficulty in working it probably makes it the wrong choice for a model.
BTW Wedsol, we didn't use the G48 test. Our internal weld spec just included the special filler wire, (with note to always use wire i.e. no "running in") and limitations regarding overheating the parent metal.
There are a few articles floating around, a presentation at www-acerc.byu.edu/News/Conference/2003/Presentations/Tree.pdf looks to be relevant but lacks much in the way of context.
I was trying to understand the preference for 2205 over the french advice for 316L st/st which is much simpler to work, Given these chemicals I think I now understand, and unfortunately (as I work with 316 in the day job) have concluded that 2205 is probably the rignt choice for a coal fired boiler, but the difficulty in working it probably makes it the wrong choice for a model.
BTW Wedsol, we didn't use the G48 test. Our internal weld spec just included the special filler wire, (with note to always use wire i.e. no "running in") and limitations regarding overheating the parent metal.