Help specifying material & hardness for wrench design

[legacy1]

I am designing a modified box end wrench and need help specifying steel alloy and hardness. The sizes are large: 22, 24, 27 and 32mm with an overall length of 12". The customer would like to forge and then broach the wrench detail. Any help would be appreciated.

 

[Goahead]

You may wish to investigate the use of:

AerMet®-for-Tooling Alloy,
an alloy of high toughness and strength
by Carpenter Technology

http://www.cartech.com/index.html

http://www.welding-advisers.com/