Modifying The Physical Structure Of Ferrous Metals; General Devices For Heat Treatment Of Ferrous Or Non-ferrous Metals Or Alloys; Making Metal Malleable, E.g. By Decarburisation Or Tempering
C23C
Coating Metallic Material; Coating Material With Metallic Material; Surface Treatment Of Metallic Material By Diffusion Into The Surface, By Chemical Conversion Or Substitution; Coating By Vacuum Evaporation, By Sputtering, By Ion Implantation Or By Chemical Vapour Deposition, In General
B32B
Layered Products, I.e. Products Built-up Of Strata Of Flat Or Non-flat, E.g. Cellular Or Honeycomb, Form
B21D
Working Or Processing Of Sheet Metal Or Metal Tubes, Rods Or Profiles Without Essentially Removing Material; Punching Metal
