- Joined
- May 19, 2009
- Messages
- 1,161
You left out this:
3.2.1.1 Steel composition.
The tool head of each type of ax shall be forged from fully killed plain carbon AISI/SAE steel containing 0.72 to 0.93 percent carbon, 0.30 to 0.90 percent manganese, not more than 0.040 percent phosphorus, and not more than 0.050 percent sulfur. Steel composition of the head shall be determined as specified in 4.5.1.1.
If the quality of axe they require could be achieved at 55 points of carbon then the spec would be for 55 points of carbon. Clearly the Forest Service believes that a better axe results with >.72 carbon.
I was more concerned with the fact that the Council Tool FSS boy's axe didn't seem to meet the HRC requirements set by the USFS (48-55 vs 54-58). As I said in my previous post, heat treat > steel. And Council makes no mention of the steel they use for their FSS axe so who knows if the steel meets the alloying requirements either. I have no doubt that a .70+% carbon steel when properly hardened to the required 54-58 would outperform GB's steel. But in this case, Council's steel of choice is kept too soft so a proper comparison can't exactly be made..
Also, if you followed the video link above, it's a fairly well trusted person among the knife community saying (at 20:25) that he feels Council's 5160 (one of my favorite steels mind you) didn't take or hold an edge as well as GB's proprietary .55% carbon steel. 5160 more or less meets FSS standards on alloying elements with .65% carbon, .75-1.0% manganese, .035% phosphorus, and .04% sulfur. It even has around .6% chromium which gives the steel even more toughness and a wee bit of corrosion resistance. Forgers love the stuff for heavy impact blades. Heck, I have a couple of kukris made out of it and they take and hold an amazing edge and stand up very well to hard chopping.
But Council chose to keep the brilliant steel in the low 50s and apparently this guy notices and his off-hand opinion is that the GB steel holds up better. Again, heat treat > steel.