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temper- heating to to 'straw' color questions

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davr

08-15-2003 08:54:21

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a few weeks ago there were some posts on how to make you own jumbo sockets. Well as bored as I was, I decided to make one for a 2.5 inch nut. Actually wasnt that hard to do once you get down to it and my socket came out nice. LAst part of the post was advise on tempering. Said to heat to 'straw' color, quench in oil and reheat to 500*. I can get to straw color with my torch..but how will i know 500*? by color?? also can i quench in 10w30 oil?? any advise appreciated as im anxious to test my welds.. (Not a trained welder..just learned everthing by trail and error and having fun doing it..)

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jake

08-16-2003 12:18:07

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Re: temper- heating to to 'straw' color questions in reply to davr, 08-15-2003 08:54:21

The answers at the bottom were getting a little silly. Hardening a heat treatable steel is done by heating to at least to 1500-1700 degrees then a quench. The steel at this point is hard and brittle that is where tempering come in. The average tool steel requires about 700 degrees for 2 hours and a let cool down resulting in hardness without the brittle problem. A little note on the color of steel I have blued guns by heating to 800 degrees in a regulated temp furnace, results were impressive.

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markct

08-15-2003 09:25:55

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Re: temper- heating to to 'straw' color questions in reply to davr, 08-15-2003 08:54:21

well the 500 degrees you could do in your household oven,if your wife or mother isnt around, my mom wasnt too apreciative of the time i used he oven to temper a 3/4 drive extension i had made. but you can also do it by the color of the part, usualy the straw color is around 500 degrees. the way i always was taught to heat treat when i was in trade school was to heat it to a cherry red and then quench it in oil (for most steels, some you quench in water or even air cool) and then it would be very hard, and after that you would polish a small spot on it and heat the entire part till ya could see the spot turn the color you wanted, depending on the hardness, and yes you can quench it in used oil, or new oil if ya got money to spend. most any oil will work just keep your face clear in case it flames up, and dip it in fast and move it around in figure 8s to keep from forming a gas pocket around the part that would make it not cool as fast as it should.

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Bill 52 8n

08-15-2003 12:57:04

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Re: Re: temper- heating to to 'straw' color questi in reply to markct, 08-15-2003 09:25:55

I missed the socket post, but are you guys talking about carbon steel? I didnt think it changed color till almost 1000 degrees. You can buy temp sticks to find the temperature. They are like a crayon, and melt at designated temps. I'm sure most weld shops have them.

CR, just a thought, it might be easier to find a small 2-3 drawer metal filing cabinet vs a fridge, it would take up less space and be easier to move aound.

Bill

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08-15-2003 13:06:38

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Re: Re: Re: temper- heating to to 'straw' color qu in reply to Bill 52 8n, 08-15-2003 12:57:04

Easier to find yes, but I am in no rush and I am frugal (read cheap). Anyway a small fridge is aready insulated so the light can be really small and the insulation is inside the metal shell so it is protected. I also like the fact that fridges have shelves. Easy to put stuff on. As for weight you remove all of the non essential parts, like the compressor and condensor.

Thanks for the suggestion though.

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08-15-2003 09:18:34

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Re: temper- heating to to 'straw' color questions in reply to davr, 08-15-2003 08:54:21

Best way I have found to temper is the following.

Clean item real well. Leave no oil or grease on part. Send wife out shopping. Crank up oven to temp desire and put in part. Note make sure wife does not return while in middle of temper or you might just see another type of temper.

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markct

08-15-2003 09:27:26

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Re: Re: temper- heating to to 'straw' color questi in reply to CR, 08-15-2003 09:18:34

hmm i guess we both typed our messages at the same time, and we both seem to have had the same experience with that method lol

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08-15-2003 10:09:23

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Re: Re: Re: temper- heating to to 'straw' color qu in reply to markct, 08-15-2003 09:27:26

Apparently we did. You know the wife does not seem to appreciate drying out welding rods in the oven either.

LOL

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Deas Plant.

08-15-2003 11:56:21

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Re: Re: Re: Re: temper- heating to to 'straw' colo in reply to CR, 08-15-2003 10:09:23

Hi, Folks. I suppose that those wife-type people sometimes have different agendas from ours but the thought has occasionally occurred to me in the past that the Good Lord did a pretty good job of making 'em, right up until He gave 'em a tongue and no sense of humour. This seems like another of those times.

OOOOO OOOOPPPPPSSSS!!!!! Sorry, Darling.

You have a wonderful day. Best wishes. Deas Plant .

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markct

08-15-2003 11:45:39

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Re: Re: Re: Re: temper- heating to to 'straw' colo in reply to CR, 08-15-2003 10:09:23

hmm, i never thought of drying welding rods, the worst i did other than the 3/4 extension in the oven, was powder coating in the toaster oven, but luckly my mom didnt catch me on that but i had to carefully clean the yellow powder paint off the rack in the toaster oven, it worked pretty good tho.

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08-15-2003 12:00:17

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Re: Re: Re: Re: Re: temper- heating to to 'straw' in reply to markct, 08-15-2003 11:45:39

I think the next time I see a small electric stove on the side of the road it may just become a new part of my shop. Save a lot of grief. Already have a dishwasher to put in the shop (parts cleaner). Also going to have to look for a small broken frig. Put a small light bulb in em and they will keep the rods dry. Also figure I will put some of the machine tools (collets and like) to keep em warm so moisture does not condense on them.

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broken fridge in the shop

08-15-2003 12:36:40

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Re: Re: Re: Re: Re: Re: temper- heating to to 'str in reply to CR, 08-15-2003 12:00:17

if i ever get around to building my shop i sure wont have a broken fridge, works good for welding rod i suppose but not the best for beer, and its hard to find good help when your trying to do those big jobs if your fridge is full of welding rod! beer tho usualy brings the help in

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08-15-2003 12:57:28

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Re: Re: Re: Re: Re: Re: Re: temper- heating to to in reply to broken fridge in the shop, 08-15-2003 12:36:40

Thats why I want a small one. Ya stack a good one on top of the broken one for the beer. That way the beer is automatically at a easy arm height.

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Keith MIller

08-15-2003 13:40:48

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Re: Re: Re: Re: Re: Re: Re: Re: temper- heating to in reply to cr, 08-15-2003 12:57:28

but remember one important thing. DO NOT let them in the beer frig till the job is finsihed.

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TimV

08-15-2003 14:30:46

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Re: Re: Re: Re: Re: Re: Re: Re: Re: temper- heatin in reply to Keith MIller, 08-15-2003 13:40:48

Keith: You bring up a very important point..buddy of mine bought a couple of kegs and a bunch of hot dogs, got a load of cull logs, then invited a bunch of friends over for a woodcutting bee. He had to run to town for more bar oil, and when he got back, they'd got into the beer. Of course, that was the end of the wood cutting (which is probably just as well--chainsaws, woodsplitters and beer are not a particularly safe combination) and he ended up having to do it himself over the next few weeks. Live and learn..... !

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Indydirtfarmer

08-15-2003 09:24:26

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Re: Re: temper- heating to to 'straw' color questi in reply to CR, 08-15-2003 09:18:34

I was about 16 years old when I decided to make some "improvments" to my car. I wanted to take a set of aluminum valve covers, and do a black "crinkle" finish. The instructions said to oven heat the paint after spraying. I Painted them, and fired up my mothers new oven. After a few minutes, the smell of baking paint started to fill the house. OOPS! My mother was not so understanding, when she returned home. I'm quite sure that my wife would be even less understanding about using the oven as a kiln.

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