Annealed 4140

[EdK]

(01-18-2013, 12:26 AM)bobm4360 Wrote: Ed:
If you need the strength of 4140, use "normalized" stock from a reputable supplier. It's harder than annealed, and turns better. Our shop used to buy 4140 "Pre-Hard", about RC35, and it turned nicely on a 12x36 grizzly with carbide, wet or dry. Just my $.02(that's tuppence for you guys that play with crickets!)

Regards,
Bob

Bob,

I don't NEED the strength of 4140 for the project I'm working on. I just chose to use it because I'd heard that it machines nicely and I've never machined any before so wanted the experience.

So there's annealed, normalized and pre-hard 4140? I've never seen normalized for sale at any of the online metal suppliers but I'll take another look. Thanks for the information Bob.

Ed