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