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