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| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
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H Half Hard Temper See Temper. Hammer Forging A forging process in which the piece is deformed by repeated blows. Hand Straightening See Straightening. Hard Temper See Temper. Hardness The resistance of metal to plastic deformation by indentation. The most common method of measurement is Rockwell. Other methods are Brinell, Scleroscope, Tukon and Vickers. Hardness Number The number used to designate the hardness of metal. The number is related to the scale of values of a particular hardness test, as Rockwell B 80 or Brinell 150. Hardware Bronze (Copper Alloy Nos. 314 and 320) See Copper Alloy. Heading The operation of either cold or hot forming the head of bolts, rivets, screws and similar products by upsetting the end of a rod or a wire blank. Heat Cracking Spontaneous failure of some metals by cracking under combined action of elevated temperature and stress (residual or applied). Fire cracking is a form of heat cracking resulting from residual stress and externally applied heat. Heat Exchanger Tube See Tube. Heat Treatment A combination of heating and cooling operations applied to a metal or alloy in the solid state to produce changes in physical and mechanical properties. See also Age Hardening, Annealing and Quenching. Helical Coil See Coil. High Brass (Copper Alloy Nos. 268 and 270) See Copper Alloy. High-Leaded Brass (Copper Alloy No. 342) See Copper Alloy. High-Leaded Brass (Tube) (Copper Alloy No. 332) See Copper Alloy. High-Silicon Bronze, (A) (Copper Alloy No. 655) See Copper Alloy — Silicon Bronze. Hot Forging See Hot Press Forging or Hammer Forging. Hot Press Forging A method of forming parts by pressing a heated slug or blank cut from wrought material in a closed impression die. Hot Rolled Bar, Hot Rolled Plate, Hot Rolled Rod, Hot Rolled Shape, Hot Rolled Wire Stock brought to final dimensions by hot rolling. Also see As-Hot-Rolled. Hot Rolled Finish See Finish. Hot Rolling See Rolling. Hot Shortness Brittleness in hot metal. Hot Working The process of changing the form or cross-section of a piece of metal at a temperature above its recrystallization temperature. Hydrogen Embrittlement In oxygen-bearing copper, a condition of low ductility resulting from absorption of hydrogen at high temperature, internal reduction of cuprous oxide and creation of intergranular holes or cracks by the accompanying generation of steam. Hydrostatic Test See Tests. I IACS Abbreviation for International Annealed Copper Standard Impact Extrusion The formation of a tubular closure by the rapid application of force through a punch on a metal blank, the metal flowing up around the punch to form the tubular section. Also known as Hooker Process. Impact Test See Tests. Impingement Attack See Corrosion. Inclined Roll Straightening See Straightening. Inclusions Particles of foreign material (usually chips, dirt, carbon, oxides) that are held mechanically on or within the metal. INCRA Abbreviation for International Copper Research Association. Ingot A copper or copper-alloy casting of small rectangular shape weighing about 20-35 pounds for remelting. Ingot Bar A small rectangular copper casting weighing about 50-70 pounds for remelting. Inhibitors Elements added in small amounts to alloys to increase the resistance of the alloys to corrosion. Internal Stress See Stress, Residual. Intercrystalline, lntergranular Terms used interchangeably to indicate a path along the grain boundaries and between the crystals or grains rather than through the grains. lntercrystalline Cracking Fracture of metal that follows along the grain boundaries and between crystals or grains. J Jewelry Bronze, 87.5% (Copper Alloy No. 226) See Copper Alloy. K Kerosene Roll Finish See Finish. |
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