I'm looking to buy some drill rods to make punches out of and I was wondering what grade/temper would be best? In the 9/32" I'm looking at they offer,Grade A2 Multipurpose Air-Hardened Tool Steel,Grade M2/M7 High-Speed Tool Steel,Grade M42 Cobalt Tool Steel,Grade O-1 Oil-Hardening Tool Steel,Grade W-1 Water-Hardening Tool Steel
The grade I was wanting they don't offer in 9/32" which was,Shock-Resistant
Air-Hardened S7 Tool Steel.......So which would be the next best choice?
Thanks much!