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Posted: 12/29/2004 10:10:55 AM EDT
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I think my next build will be with a ColdSteel .040 blank. Since all the dimples are stamped in, may look somewhat more proper when completed. My son can spot weld the rails in place where he works and I'll get whatever tools I need to do the riveting. I'll do a plastic Russian side-fold '74. All the parts come in about 500 bucks not counting the blank and shipping from suppliers. So, it will need to be properly heat-treated, complete heat treat since it's the std. thickness. Now, I have an oven capable of melting the thing so no need to use a torch or whatever. I assume if it is heated slowly, it should not warp like some have done when using a torch or whatever - right? I need temps and any other info anyone in the know can provide...... Thanks |
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In this case, it's not the 35 bucks. It's a case of me doing it myself since I do have a proper oven, etc. I should remember this from school some 30 years ago but alot of things have slipped my memory :) I'm thinking it's 600 degress until evenly heated, oil quench, reheat to 350 and air cool...but I'd rather make sure. I've never had to treat sheetmetal before so I'm also wondering about warpage. That should not be a problem using an oven - better safe than sorry. Also, done before or after the rails are installed? I assume after. |
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If the receiver material is 4130 steel use the following as a guide line- AISI 4130 Steel, water quenched 855°C (1570°F), 480°C Material Notes: As quenched hardness: 51 HRC surface Hardness after 900°F Deg., Rockwell C 36 I found this to be pretty accurate. I built a receiver from one of the laser cut flats (4130) Material. I first heat treated the entire receiver and oil quenched it. It did not reach the hardness level I wanted. I then used a torch and treated the needed receiver holes ,rivet and rails and water quenched. The water quench did the trick and the material hardened well. The draw temperature of 900 Deg. will bring you back into the rc30 range. If you want more hardness lower your draw temperature. Attached is a link for 4130 data sheets. http://www.aerospacemetals.com/steelalloys.html |
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OOW says in an ad: " Heat treated (the trigger and hammer holes are heat treated, then the whole receiver is drawn down at 600 degrees for one hour. The receiver is now heat treated, but not brittle (if you heat treat the whole receiver, the minute you quench it you will warp the entire thing)." Just passing it on. Don't confuse education for intelligence(unknown) |
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Thanks guys...I know what OOW says in their ads...but that alos makes me wonder why some people make money doing what they call a "proper" heat treat of the entire receiver. From what I've been digging up, the temps JKH states seems right on. I guess I'll find out :) |
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