Fe-Wood Posted November 24, 2010 Share Posted November 24, 2010 I tried my hand at spinning some stainless today .037" thick and ran up against a need to anneal. Don't know how! Never had to do it.... Anybody show me the way? Thanks! Link to comment Share on other sites More sharing options...
Nakedanvil - Grant Sarver Posted November 24, 2010 Share Posted November 24, 2010 300 series? 1950F and quench in cold water! Yes, really. Link to comment Share on other sites More sharing options...
Fe-Wood Posted November 24, 2010 Author Share Posted November 24, 2010 Thanks Grant! Is that a pretty bright red heat? No temple sticks. I'm sure its 304 or 316 Link to comment Share on other sites More sharing options...
Nakedanvil - Grant Sarver Posted November 24, 2010 Share Posted November 24, 2010 Orange, not quite yellow.Never worked with anything that thin, why don't you try air cool first. Link to comment Share on other sites More sharing options...
kraythe Posted December 1, 2010 Share Posted December 1, 2010 300 series? 1950F and quench in cold water! Yes, really. Quench for anneal? Really? Why is that Grant? I had been thinking about messing around welding some stainless. I know you have to exclude oxygen in the weld usually via a capsule but why would you quench the anneal? Link to comment Share on other sites More sharing options...
pkrankow Posted December 1, 2010 Share Posted December 1, 2010 http://www.spiusa.com/Ref001/300prop1.html My guess is that with less than 20 points of carbon it acts like a normal metal instead of like steel. Phil Link to comment Share on other sites More sharing options...
Mainely,Bob Posted December 1, 2010 Share Posted December 1, 2010 I`m listening closely here as I used to heat it and then throw it in the corner. I`m looking forward to learning something new. How about it Grant? "We`re all in our places with bright shining faces" as my kindergarten grade teacher would say. Man that woman was annoying!That is far too young an age to be exposed to the "kill `em with kindness" technique.Gives me the willies just thinkin` about it. Link to comment Share on other sites More sharing options...
Mainely,Bob Posted December 1, 2010 Share Posted December 1, 2010 Just a quick thought there Mr Sarver,if we were to get the state to fund a few of us moving in with you and you overseeing us till we grow up would that make you a "Foster Grant"? Ducking and running now boss! :) Link to comment Share on other sites More sharing options...
Fe-Wood Posted December 1, 2010 Author Share Posted December 1, 2010 Had a minute yesterday so I tried to anneal the stainless with the quench method (to impatient to wait). I'm using propane and oxy for heat. Got it to a nice bright orange almost yellow heat. I think it is 20g - heats fast and cools fast. It softened right up. Now about that carbon layer. Man that stuff is tough! Any backyard techniques to avoid this? Tricks for removal? Link to comment Share on other sites More sharing options...
Mainely,Bob Posted December 1, 2010 Share Posted December 1, 2010 "Tricks for removal?" Pickle it,acid from the pool supply works for me. Then the fun starts,bring a big grinder. Link to comment Share on other sites More sharing options...
Nakedanvil - Grant Sarver Posted December 2, 2010 Share Posted December 2, 2010 Just S.T.O.C.K.! ** ** (Stuff The Old Coot Knows) Link to comment Share on other sites More sharing options...
BIGGUNDOCTOR Posted December 2, 2010 Share Posted December 2, 2010 Depending on what our customers want, we either get nitric, or citric acid passivation done on our stainless parts. Link to comment Share on other sites More sharing options...
Fe-Wood Posted December 2, 2010 Author Share Posted December 2, 2010 OK S.T.O.C.K.????? your not suggesting I put it in a crock pot and cook it like soup S.T.O.C.K. BGD- Passivation? enlighten my simple mind :huh: Link to comment Share on other sites More sharing options...
pkrankow Posted December 2, 2010 Share Posted December 2, 2010 Passivation? enlighten my simple mind Citric and nitric (and I think acetic) acids will etch the iron, but leave the chromium, causing a layer of chrome oxide to form, and removing free iron from the surface making a durable rust-resistant coating. Acids containing chlorine like hydrochloric (muriatic) will strip the chromium oxide and promote rusting. Hope this helps. Phil Link to comment Share on other sites More sharing options...
Fe-Wood Posted December 2, 2010 Author Share Posted December 2, 2010 Citric and nitric (and I think acetic) acids will etch the iron, but leave the chromium, causing a layer of chrome oxide to form, and removing free iron from the surface making a durable rust-resistant coating. Acids containing chlorine like hydrochloric (muriatic) will strip the chromium oxide and promote rusting. Hope this helps. Phil What kind of solution should I use? Thanks Phil :D Link to comment Share on other sites More sharing options...
pkrankow Posted December 2, 2010 Share Posted December 2, 2010 I would be cheap and try the vinegar first. If it does not perform well, I would then try citric acid as it is safer than nitric acid. If you Google "passivation of stainless steel" there are some articles. This explains what is going on rather well. http://www.iftworldwide.com/white_paper/passivation.pdf Phil Link to comment Share on other sites More sharing options...
Frosty Posted December 3, 2010 Share Posted December 3, 2010 You can do passivation on SS using electrolysis. Use baking soda and water for the electrolyte, hook the pos lead from a trickle charger to the SS and the NEG lead to a SS scrap. Put them both in the electrolyte and turn the charger on. It'll be clean in a while, just check occasionally. If you use dilute sulphuric acid for electrolyte you can clean up the heat scale in minutes depending on the concentration but you'll have to rinse, neutralize, dry and dispose of the acid safely. Whatcha spinning? Frosty the Lucky. Link to comment Share on other sites More sharing options...
Fe-Wood Posted December 3, 2010 Author Share Posted December 3, 2010 a friend asked if I could spin a set of dinner plates out of stainless... Of course I said yes.... and just to complicate it I thought I would add a set of bowls. So I'm teaching myself how to spin a 7" dia. X 3" deep bowl. I almost got it without needing to anneal. That last 3/4" at the rim is a bugger Heres a picture of the finished continental kit for the trailer I did a while back Link to comment Share on other sites More sharing options...
Fe-Wood Posted December 3, 2010 Author Share Posted December 3, 2010 I would be cheap and try the vinegar first. If it does not perform well, I would then try citric acid as it is safer than nitric acid. If you Google "passivation of stainless steel" there are some articles. This explains what is going on rather well. http://www.iftworldwide.com/white_paper/passivation.pdf Phil Good Article Phil- Thanks! Link to comment Share on other sites More sharing options...
Nakedanvil - Grant Sarver Posted December 3, 2010 Share Posted December 3, 2010 You got way too much time on your hands! But it is beautiful, for sure. Link to comment Share on other sites More sharing options...
forgemaster Posted December 20, 2010 Share Posted December 20, 2010 Be aware that not all stainless is anneal by quenching, the martensetic grades are normally a subcritical anneal (heat to 650 deg C hold for up to 12 hours allow to air cool to ambient). If you pickup some stainless from the scrap yard you need to identify it before you go messing with it. Martensetic grades are normally magnetic. It can be a bugger to anneal, we just had to have 3 goes at annealing 2 24"od x 3" x 18"id rings out of 431 stainless last week. They kept on coming out at 416 HB, we had to go back right to the start and begin again. We finally got them down to 255HB and our customer was finally able to machine them. Merry christmas to everyone. Its 8.30 in the morning here, and I'm sitting on the verandah typing this wearing a tee shirt and shorts and its already 25 deg C. Seen the pickys of up north and all I can say have a nice white christmas. Phil Link to comment Share on other sites More sharing options...
arftist Posted December 20, 2010 Share Posted December 20, 2010 Thanks Phil, you too. It's howling out there, snow swirling and the roads are slick at 4:45 P.M. Link to comment Share on other sites More sharing options...
ThomasPowers Posted December 20, 2010 Share Posted December 20, 2010 Cold and gloomy here---why with the cloud cover it only got into the low 50's and we got a tenth an inch of rain just in the last month or two! I keep trying to remember *why* I spent 15 years in Ohio.... Link to comment Share on other sites More sharing options...
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