PDA

View Full Version : Rough idea how hard and what type of steel?



softtail
01-11-2018, 03:56 PM
I picked up two large chuck jaws from what I'm guessing was a large turn of the century lathe (from the number stampings). Anyways, nice heavy chunks of steel that I'm wanting to re purpose...one end is concave serrated, other is threaded through for large screw with wrench flats.

Anyways this stuff is hard. Band saw started to cut, but then stopped, replaced blade, same thing. Good file just barely cuts it, but doesn't like it much. 3/4" Carbide mill works, carbide face mill threw sparks and did cut, bit it was ugly. Didn't try hss.

Any ideas what a ballpark hardness or material is?

MattiJ
01-11-2018, 04:00 PM
Close to 60 HRC if good file barely cuts. 60 +-5 would be pretty good guess.

lakeside53
01-11-2018, 04:03 PM
Turn of the century was only 17 years ago ;)

3 Phase Lightbulb
01-11-2018, 04:16 PM
Turn of the century was only 17 years ago ;)

Don't you mean 18 years ago? :)

lakeside53
01-11-2018, 04:23 PM
Don't you mean 18 years ago? :)

Not for me; I'm still catching up!

3 Phase Lightbulb
01-11-2018, 04:47 PM
Not for me; I'm still catching up!

It sometimes takes me more than an hour to watch CBS's "60 Minutes" TV show too... :)

danlb
01-11-2018, 04:54 PM
A grinder spark test usually a good way to get a good idea of the steel.

Gary Paine
01-11-2018, 04:56 PM
Dang, for the price of sawblades and carbide cutters, you could have had some awfully pretty brand new steel. :D
If it is the shape you want from the jaws, consider annealing them by heating red hot and cooling in a bucket of ashes. Then you can cut and drill without wearing out your tools so fast.

softtail
01-11-2018, 05:05 PM
Dang, for the price of sawblades and carbide cutters, you could have had some awfully pretty brand new steel. :D
If it is the shape you want from the jaws, consider annealing them by heating red hot and cooling in a bucket of ashes. Then you can cut and drill without wearing out your tools so fast.

Blades and cutters still good!

softtail
01-11-2018, 05:06 PM
Close to 60 HRC if good file barely cuts. 60 +-5 would be pretty good guess.

Thanks much..

gambler
01-11-2018, 07:35 PM
what are you going to make with them? curious minds want to know.:)

754
01-11-2018, 09:42 PM
Blade stopped cutting but it's still good. ...
I must be missing something..?

softtail
01-11-2018, 10:40 PM
Blade stopped cutting but it's still good. ...
I must be missing something..?

Yes, you are.

redgrouse
01-12-2018, 09:40 AM
Assuming turn of the 19th century its most likely a plain carbon steel or case hardened low carbon steel, in either event I would be cautious on its use --don't use for critical part !
To make it useful it needs to be annealed so heat to 750 deg C and leave to cool then you will be able to machine it etc, a grinding test for the outside and the core will let you know if its case hardened MS or a full carbon steel -- different sparks from the outside and the core denote differing carbon content.
Hope this helps