Riveting questions on Metallurgy....HELP 1

[dkmc1]

I've got job to make Rivets.......

Thin wall, 7/16 OD of flange X .379 Body OD X.305 ID. The material spec was 1010. But it's a turned part, so I offered 1018 as 1010 is not available in
bar, just sheet, strip or plate. 1018 was accepted as a substitute. Problem is, when they are flared they are cracking which is NOT acceptable.
Tried 12L14 and it cracks worse.
It turns out the original parts were a draw-stamping and most likely made from 1010 strip.

Some things I've heard already:

1.Possibly have the parts made from 1018 or 12L14 annealed.....
2.Try A36 (hot rolled bar)...

Must be machined from bar, as I would think building a die to stamp them is not cost effective
nor is there money in the budget at this point.

Any suggestions to what alloy would allow the flaring without cracking?
Annealing process?


Dan K
Kliegel Machine Co
Big Flats, NY

 

[swall]

First of all, forget about any of the free machining grades--these will all be prone to cracking because of the inclusion content. So, rule out 12L14, 1117, etc. Annealed 1018 bar is a good option, but it would be even better if you could find some lower carbon annealed bar stock (straight lengths), such as 1008. As you probably know, most of the 1006/1008 bar is in the form of coiled bar, not straight bar lengths, so you may have to hunt around quite a bit. I can't see A36 as offering any benefit.

 

[CoryPad]

Annealing 1018 may help, but likely you need a more formable (lower carbon concentration) steel. You can get 1008 steel in 0.5 in diameter from Jorgensen:

http://www.emjmetals.com

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[EdStainless]

Try annealing the 1018 first. Don't use too high of a temp you don't want too much grain growth.

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