About CHEN Z T
About XIAO M
About PU W L
About MIAO H H
About Jinshu Rechuli
About medium carbon steel
About high carbon steel
About tool steel
About parts
About abrasion resistance
About laser hardening
About carbonitriding
About case hardening steel
About surface roughness
About fatigue strength
About microhardness
About Surface hardening
About レーザ焼入