Nicholas Mason wrote:I don't know this for sure, but I have heard that the gasses from the wood weaken to the metal. That is why you use charcoal or coal to blacksmith. In charcoal the gasses have all been cooked out already.
Afghani Nurmat wrote:there has to be a way...
and this here looks pretty promising and awesome. thanks for posting! (should have looked at you link right away)
the look makes me instantly think of a bloomery (which is basically a rocket stove with extra air blown into it, that is fuel-fed from the top)
is there already a way to regulate the fire? would you say it needs more fuel than a regular rocket? would you mind maybe posting a crosssection sometime?
great inspiration anyway...
it is the final straw for me. i am just gonna build a prototype myself as soon as possible. (and then i can find out how much of a problem the sulphur will be for my purposes, if it has enough power and so on...)
maybe to build it like a bloomery isn`t the worst idea. the forced secondary air could provide a means of regulation, too.
i don`t know how easily the sulphur stuff compares to carburizing, because sulphur is already fatal in traces whereas you need significant amounts of carbon to make temperable steel; also for most works including tool steel you have to reheat more often and often use only thin sheets that than get welded together, but do expose a lot of surface before. and as i said before, for ornamental stuff and non-load bearing funktional stuff like your scoop made from regular construction steel this is probably never a problem. maybe it isn`t for any purpose. it`s just that i mend a lot of tools and during the beginnings of my apprenticeship i wrecked a pickax (my own pickax i wanted to fix after work) and was told it was because i had used fresh coal. then, when i started making knives a few years ago i experienced "red brittleness" on my first try with welding high carbon sheet steel on an anthracite fire. i changed to charcoal or charcoalmix for these purposes and never had any problems since, but the burnt child dreads the fire...(or the sulphur)
and you wouldn`t need to take material of, because the problem only occurs with "red" heat. i guess you already know about the structure of steel; "red brittleness" is caused by the lower melting point of the sulphur-carbon-compound on the grain-boundaries.