Derwent Classification System: Metallurgy

Chemical aspects of metal production, working and finishing including welding and brazing.

Approximate IPCs are given in brackets.

M1 METAL FINISHING
M11 Electroplating; electrolytic treatment of or with metals - including electro-deposition of metals, electro-plating apparatus, electro-forming, electro-erosion, spark erosion, anodising (electrophoretically) coating metals and electrolytic cleaning and polishing (C25).
M12 Chemical cleaning and degreasing - including cleaning and pickling.
M13 Coating material with metals, diffusion processes, enamelling and vitreous coatings - including coating from liquid metal or solution, spraying, cementation, cathodic sputtering, enamelling and oil-free lubricant coatings, but not coatings for the production of semiconductors (C23C, D).
M14 Other chemical surface treatments - including etching, brightening, forming non-metallic layers, passivation, cathodic protection and corrosion inhibitors, but not processes specifically for semiconductor production (C23F, C25). This Section also covers multistage processes.
M2 METALS
M21 Metal rolling and forming (B21).
M22 Casting; powder metallurgy - including foundry moulding, moulding machines, patterns, moulds, cores and metal casting (B22).
M23 Soldering; welding - including brazing, flame cutting and scarfing, cutting and welding rods, soldering and unsoldering apparatus and solder compositions (B23K).
M24 Metallurgy of iron and steel - including manufacture and processing, treatment of steel melts and changing the physical properties of iron and steel, control/testing methods, blast furnaces and converters. Metallurgical coking processes (C21, C10B).
M25 Production and refining of metals other than iron - including ore treatment, extraction, working up scrap, obtaining specific metals, control testing methods (C22B).
M26 Non-ferrous alloys - including alloy production and composition (C22C).
M27 Ferrous alloys - including alloy production and composition (C22C).
M28 Electrolytic and electrothermic production and refining of non-ferrous metals - excluding heat treatment (C25).
M29 Changing the physical structure of non-ferrous metals and alloys - including tempering, annealing, work-hardening and recrystallising (C22F).