[TheForge] tool steel mark

[Ron Swisher]

Dave,  I've been treating it as air hardening steel.  Maybe hammer drill is 
the wrong name.  I forged the blank into a shape that will be used for 
chipping out old mortar between bricks.  I think this unit reciprocates but 
do not think it rotates.  The guy restores old masonry.


----- Original Message ----- 
From: "David E. Smucker" <davesmucker at hotmail.com>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Tuesday, April 26, 2005 8:39 PM
Subject: Re: [TheForge] tool steel mark


> New to me, I have never see this, maybe an in house number.  By hammer 
> drill do you mean a rotory hammer drill?  That being the case I would 
> "guess" the steel is S1, S5, or S7.  S1 and S5 are oil hardening, S7 air 
> hardening.  Cut a small sample and heat to a lemon yellow and let it air 
> cool.  If it gets real hard then you most likely have a air hardening 
> steel.  If not try this again but oil quench.  (S5 is not very common 
> anymore, but a lot of S1 and S7 out there.)
>
> Good Luck,
>
> Dave