45#- Before high-frequen…
45#- After high-frequenc…
20CrMo- Before high-freq…
20CrMo- After high-frequ…
SPCC- Before carbo-nitri…
SPCC- After carbonitridi…
8620- Before carburizing…
8620- After carburizing …
GCr15- Before vacuum oil…
GCr15- After vacuum oil …
DC04- Before vacuum carb…
DC04- After vacuum carbo…
