43-40 can anyone tell me about this steel

4340 is a cromoly steel, not really suitable for knives, but makes great crank shafts and connecting rods! Also used quite a bit for rifle receivers.


-Xander
 
40 points of carbon is too low, it won't harden properly for a knife. In theory 4150 will (it can hit HRC60) but even it is not suitably hard (mid to low 50's) with even a minimal temper. You are probably going to want at least 60 points of carbon for a knife.
 
JAMerolle said:
Thanks for Heads up what if i mix with 15N20 For a Damascus blade
Click to expand...

Well, yeah I guess. But making Damascus is a lot of effort to not go ahead and use the best steels for the application. 15n20 and 1084 are a very popular blend and the 1084 is very inexpensive and would probably make a better knife than chromo. You'll get better contrast too.
 
4340 is a chrome-moly-nickel steel .The nickel makes it very tough. Hammer , hatchet, anvil but not for blades. A great steel !!
 
JAMerolle said:
how does 43-40 toughness size up against 1095 toughness if the application is copping wood
Click to expand...
Is it safe to assume the damascus blade you asked about in the other thread is 15N20 and 4340?

My Guess would be that the edge on the knife will roll. Do a brass rod test and see if the edge rolls.
 
I am speculating that it is 4340 but I hope I am wrong , but yes we are talking about the same knife. Can you tell me how to perform a brass rod test
 
If properly heat treated I don't think the edge would roll (I'm not sure what damascus blade you guys are talking about). If we assume that the averaged carbon content is @ 57 pts that is sufficient for a reasonable edge that shouldn't roll. I probably don't have all of the facts, what am I missing?
 
well I chopped a great deal of wood with it and no roll or damage at all
 
Last edited:
You must log in or register to reply here.
Back
Top