[TheForge] S-5 Steel

[Dave Brown]

At 20:52 07/10/02 -0600, you wrote:
>S-5 is significantly tougher than S7 for cold work.  It is designed for
>use
>in shear blades where high impact is expected.  S7 is superior for hot
>applications, such as hot punches etc.  S5 is a bitch to forge and is
>very
>stubborn under the hammer, at least in my experience.

The Delsteel site also lists S7 as follows:

      Best all around hot work tool steel
      offering high resistance to impact,
      wear and fatigue at temperatures up
      to 1000=B0F. Air hardening and simple
      to heat treat with minimum
      distortion.

      Special rivet sets, bull dies,
      punches, forging dies, mandrels and
      pneumatic chisels subject to high
      temperatures.

>  It is an air
>hardening
>grade

Oops, I think you made a little goof.  The S7 is air hardening (see=20
abouve), S5 is Oil or Water hardening (see previous post).

Dave Brown