Bubba682
Anybody got any quick tips for working 4140 i've got some coming but i've never forged with it before.
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jmccustomknives
Do warm ups, not fun to forge.  Heat treat is fairly simple.

Rule #10;  "I can make that" translates to; "I'm to cheap to buy it new."

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Bubba682
Were can i get info on working temp range and heat treat info been lookin but ....
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jmccustomknives
https://www.speedymetals.com/information/Material42.html

Rule #10;  "I can make that" translates to; "I'm to cheap to buy it new."

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Bubba682
I like that info thks ...
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anvil
another spec source for many steels is "the heat treaters guide companion. it's a free android apk.
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Bubba682
I'M going to check that out,i got 4' of 1.5 '' round stock so i am going to get to know the do and don't of 4140 lol but so far so good.I SHAPED 4'' of into it a 15'' chopper which still has to be finished i don't find working it that bad atleast not what i expected.
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Ferrous Beuler
I see this thread is a bit dated but I'll chime in anyway. 4140 is chromium-molybdenum steel, known informally as "chrome-molly". I first became familiar with it about 25 years ago at aircraft maintenance school. It is used in the manufacturing of light aircraft frames, also that of motorcycles, stock cars, etc. Like all steels it is an alloy. Welding it can be finicky but good results are easily had if prescribed parameters are adhered to. As with any stock one is unfamiliar with, google is your friend. Look it up with authorities like SAE-AISI, McMaster-Carr, Practical machinist, etc. Just enter "4140 chromium molybdenum" in the search box and it will bring up all those sites. Therein you will find all the tips and quirks of this particular flavor of steel.
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Bubba682
Thks Ferrous i got the info i needed got to say i like workin with it and its cheaper here than 01 tool steel, so price rules ...
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