Material for cold chisel or punch?

[sprintcar]

I'm looking for the best material to use for a special punch that needs to withstand heavy hammer blows - It will be about 10" overall, with a 6" (152mm)long body diameter of 0.65" (16.5mm) for clearance. One end will be 1" diameter and radiused for hammer impact. The other end screws into the target part with a 3/4-10 UNC thread.

I found 6150 and 8620 could be used. Since this will be used in cold climates, some 5% nickel alloys looked like they might be better.

Punch can be heat treated after machining if needed - your recommendations/specs would be greatly appreciated!

Thanks

"If A equals success, then the formula is: A = X + Y + Z, X is work. Y is play. Z is keep your mouth shut."
-- by Albert Einstein

 

[swall]

The "S" series of tool steels typically get used for such service. That would be S1,S2, S% or S7.

 

[TVP]

I agree with swall about S series tool steel. Check out the following links for more information:

http://www.timken.com/products/specialtysteel/engineering/tech_info/coldworktoolsteel.asp

http://www.crucibleservice.com/datash/dsS7v6.pdf?CFID=423435&CFTOKEN=16182811

http://www.cartech.com/

 

[swall]

Yes, these will require heat treating. And that would be "S5" not "S%".