caterpiller steel?

Thanks Dave R, this helps. DH-2 steel-
http://www.matweb.com/search/SpecificMaterial.asp?bassnum=NSANDV037
# The DH family of grades offers two innovations based on the latest Sandvik developments:The unique grain size distribution is optimized to improve the toughness and the micro crack resistance
# The composition of the DH grades includes specific additions to increase the thermal resistance (thermal cycling fatigue), and the corrosion/oxidation resistance

This combination of innovations gives the DH grades a high edge retention and crack resistance. These properties, combined with a good brazeability and grindibility, allow the DH grades family to be very efficient when looking at cost/performance ratio.

# Features: Fine grain size
# Medium to high abrasion resistance
# Medium impact strength
# Binderphase content 6%
Hardness, Rockwell A 91.5 (could this be right).
 
Any clarity on this yet?
my feeling is that it is the leaf springs from a caterpillar truck the kamis found but I suppose there is still a possibility it is from a caterpillar bulldozer...from which it has been said only the tread pins are suitable for knifemaking...
 
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