According to the Machinerys handbook, 1450 degrees F. Heat and hold to
ensure saturation depending on size and thickness(half an hour to an
hour once temp is reached), then slowly reduce to 1000 f, then remove
and let air cool.
1144 is the ANSI spec for StressProof, and StressProof's heat treat will
be ruined by a anneal cycle.
But then I've never seen someone supply 'hardened' 1144 - maybe as TGP
linear bearing rod? That stuff cuts pretty nicely as-is.
1144 isn't tool steel. It's a freecutting high-tensile carbon
steel and has about 125KSI tensile strength in the as-drawn condition.
Shouldn't need annealing if it hasn't been heat-treated. I would
anneal it by heating it slowly to dull cherry red and cooling it
slowly in sand or ashes.
AISI 1144 Steel, annealed at 790°C (1450°F), furnace cooled 11°C
(20°F) per hour to 620°C, air cooled, 25 mm (1 in.) round
I believe it's a medium carbon steel. I haven't seen it referred to
as tool steel.
In metallurgy class, we were taught that any 1xxx steel is "carbon steel".
A steel starting with other numbers (like the infamous 4140) would be an
alloy steel (of course there are lots of different types of "alloy steel").
Traditional tool steels start with A (air-hardening), D (die), H (hot work),
O (oil-hardening), S (shock resistant), M (Molybdenum), T (Tungsten), P
(plastic moulds), W (water-hardening), etc. I'm sure I'm missing a few. And
then there's the newer tool steels that have odd designations that don't
mean anything to me right now... CVRxxxx or some such...
I could see 1144 being a "tooling steel" which is probably a wishy-washy
term used by cheap toolmakers ;-)
I'm sure Ed (and others) can chime in and prove me wrong, however...
This is why I lurk on this newsgroup. I have a whole bunch of stressproof,
courtesy of an auction. So what is stressproof steel good for? I assume by
your comment that I machine it as is (A file will cut it so its not too
hard) Any recommended heat treatment options?
Good for making hardware that you don't want to bother heat-treating
afterward. Years ago, working in an air brake remanufacturing shop, we
ran into a new model of air compressor that had a goofy nut for
retaining the drive coupling to the crankshaft. These had an unusually
coarse metric thread, a hex in inches, and a flange to maximize
coupling contact to try to prevent loosening due to reciprocating
forces. These nuts were sold by the OEM for something like $50 each,
simply because no one else had them. I made a big bunch from 1144, we
sold them for about $8 and still made lots of money. I never heard of
The 1144 machines beautifully and is plenty strong.
"Stressproof," I think, would refer to its resistance to cold
cracking, unlike so many other resulfurized freecutting steels.
At .44% carbon it should be hardenable. Might made simple punches
and so on for short-run applications, though W steels are better for