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4140 Heat Treat

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Dennis/Ohio

07-19-2001 04:13:18




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4140 heat treat, Want to make backhoe pins with it. I was told by supplier its the same as Accrulloy, 28 to 32 rockwell. I wanted something I could use without additional heat treating. The color code on the end is black. I also have a length thats color coded green & black and a length thats coded green. I've checked all with a file and dont see any difference. Whats up? Thanks, Dennis..... ...

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Ray,IN

07-21-2001 20:30:08




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 Re: 4140 Heat Treat in reply to Dennis/Ohio, 07-19-2001 04:13:18  
Dennis, as an afterthought I would suggest a different approach. I want the cheapest, easest to replace part to be the one to break,wear out, or bend. Perhaps an ordinary cold rolled steel pin is all you need. The pretreated steels are difficult to machine, thou it's possible to machine steel up to Rockwell "c" 42 using carbide tools the expense will be quite high. I've made some dies from the pretreated steel over 38 years toolmaking and it's slow, tedious, and expensive. Good Luck with whatever decision you make!

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al

07-21-2001 07:33:18




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 Re: 4140 Heat Treat in reply to Dennis/Ohio, 07-19-2001 04:13:18  
I'm not going to say it is not out there but a pin hard enough to resist wear and soft enough to machine was not available when I tried it. I gave up. Then I was working at a shop that ordered pin material for a job. This stuff looked like hyd cyl chrome rod,and we could not cut it with a bandsaw.We ended up cutting it with an abrsive cut off saw. Maybe that would work.The problem is getting the size you need that does not require machining.
Also there are many aftermarket pin and bushing suppliers that would be cheaper than CAT,CASE or DEERE.

al

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Tom

07-21-2001 18:15:11




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 Re: Re: 4140 Heat Treat in reply to al, 07-21-2001 07:33:18  
Try Thompson Rod, case hardened rod for linear bearings.



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Ray,IN

07-20-2001 21:06:03




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 Re: 4140 Heat Treat in reply to Dennis/Ohio, 07-19-2001 04:13:18  
The color of the end is mfgr. specific usually. 4140 must be tempered at 1000deg. F to obtain a hardness of Rockwell "C" 30, this is a high tensile strength steel that will serve well, as you were told. You might consider using one of the pre-heat treated steels that are available, these are nearly as good for your purpose as 4140, and you can machine it then use it. One of the names that I remember is brake die, this is a pre-heat treated, tempered steel used to make the bending dies for kick presses. It will wear well and resists work hardening.

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