Some of the test pieces were then case hardened at 920° 950° C. in a furnace with {HEAD ~ a C potential} of {TAIL ~ 0.8%} resulting in a case depth of roughly 0.4 mm 
Some of the test pieces were then case hardened at 920 ° 950 ° C. in a furnace with { HEAD ~ a C potential } of { TAIL ~ 0.8 % } resulting in a case depth of roughly 0.4 mm
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH