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4K001
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MANUFACTURE AND REFINEMENT OF METALS
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4K002
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Manufacture of carbon steels or cast steels
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4K005
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Heat treatment of nonferrous metals or alloys
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4K006
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Electrochemical coating by surface reaction
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4K011
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Electrodes for compound or non-metal manufacture
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4K012
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Manufacture of iron
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4K013
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Treatment of steel in its molten state
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4K014
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Refinement of pig-iron, manufacture of cast iron, and steel manufacture other than in revolving furnaces
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4K015
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Blast furnaces
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4K016
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Alloys containing diamond or metallic compound
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4K017
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MANUFACTURE OF METAL POWDER AND SUSPENSIONS THEREOF
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4K018
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POWDER METALLURGY
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4K019
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Manufacturing nonferrous alloys
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4K020
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Manufacture of alloys or alloy compounds
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4K021
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ELECTROLYTIC PRODUCTION OF NON-METALS, COMPOUNDS, APPARATUSES THEREFOR
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4K022
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CHEMICALLY COATING
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4K023
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Electroplating and plating baths therefor
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4K024
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ELECTROPLATING METHODS AND ACCESSORIES
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4K025
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Electrochemical or electrophoresis coating
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4K026
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Chemical treatment of metals
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4K027
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COATING WITH MOLTEN METAL
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4K028
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Solid-phase diffusion into metallic material surfaces
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4K029
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PHYSICAL VAPOUR DEPOSITION
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4K030
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CHEMICAL VAPOUR DEPOSITION (CVD)
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4K031
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Coating by spraying or casting
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4K032
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HEAT TREATMENT OF STEEL
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4K033
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Manufacturing of steel electrode plates
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4K034
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Heat treatments in general, especially conveying and cooling
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4K036
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Heat treatment of magnetic ferrous alloys
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4K037
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Heat treatment of sheet steel
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4K038
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Control of heat treatment processes
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4K039
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Heat treatment
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4K042
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HEAT TREATMENT OF ARTICLES
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4K043
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Heat treatment of strip materials and filament materials
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4K044
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OTHER SURFACE TREATMENTS FOR METALLIC MATERIALS
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4K045
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Vertical, hearth, or arc furnaces
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4K046
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Crucibles and fluidized-bed furnaces
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4K047
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Enameled finish of metals
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4K048
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Electrolytic cleaning and etching
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4K049
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Other furnaces and combination of furnaces
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4K050
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Tunnel furnaces
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4K051
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Furnace housings, linings, walls, and ceilings
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4K052
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Elimination of nonmetals through diffusion and heat treatment of cast irons
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4K053
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Cleaning and de-greasing of metallic materials by chemical methods
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4K054
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Manufacturing ferrous alloys (excluding power metallurgy)
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4K055
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Furnace charging or discharging
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4K056
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Waste-gas treatment and other accessory devices for furnaces
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4K057
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Etching and chemical polishing (i.e., glazing)
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4K058
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Electrolytic production of metals
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4K059
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Open sintering furnaces
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4K060
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Prevention of electric corrosion
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4K061
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Muffle furnaces and rotary kilns
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4K062
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PREVENTING CORROSION OR INCRUSTATION OF METALS
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4K063
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FURNACE DETAILS; PREHEATING; TREATMENTS OF DISCHARGES (FURNACE IN GENERAL 3)
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4K070
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Carbon steel or casting steel manufacturing
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