URI
Notation
669
Caption
Metallurgy
See also
539.4Strength. Resistance to stress
539.5Properties of materials affecting deformability
546Inorganic chemistry
546.3Metals in general
621.7Mechanical technology in general: processes, tools, machines, equipment
621.8Machine elements. Motive power engineering. Materials handling. Fixings. Lubrication
621.9Working or machining with chip formation. Abrasive working. Hammers and presses
622Mining
661.8Metallic compounds in general. Salts. Mineral compounds
Broader class
66  Chemical technology. Chemical and related industries
Narrower classes
669.1Ferrous metallurgy. Iron and steel
669.2Nonferrous metals in general