The cold working of dead soft annealed strip metal immediately prior to forming, bending, or drawing operation. A process designed to prevent the formulation of Luder?s lines (Which see). Caution-Bridled metal should be used promptly and not permitted to (of itself) return to its pre-bridled condition.
(For tempered steel.) A method of testing hardened and tempered high carbon spring steels strip wherein the specimen is held and bent across the grain in a vice-like calibrated testing machine. Pressure is applied until the metal fractures at which point a reading is taken and compared with a standard chart of brake limitations for various thickness range. (See Bond Test.)
Joining metals by fusion of nonferrous alloys that have melting points above 800?F. but lower then those of the metals being joined. This may be accomplished by means of torch (torch brazing), in a furnace (furnace brazing) or by dipping in a molten flux bath (dip or flux brazing). The filler metal is ordinary in rod form in torch brazing; whereas in furnace and dip brazing the word material is first assembled and the filler metal may then be applied as wire, washers, clips, bands, or may be integrally bonded, as in brazing sheet.
Copper base alloys in which zinc is the principal added element. Brass is harder and stronger than either of its alloying elements copper or zinc; it is malleable and ductile; develops high tensile with cold-working and not heat treatable for purposes of hardness development.
(Yellow) Strip. 65% copper and 35% zinc. Known as "High Brass" or "Two to One Brass." A copper-zinc alloy yellow in color. Formerly widely used but now largely supplanted by Cartridge Brass. (Which see)
(Cartridge) Strip. 70% copper 30% zinc. This is one of the most widely used of the copper-zinc alloys; it is malleable and ductile; has excellent cold-working; poor hot working and poor machining properties; develops high tensile strength with cold-working. Temper is impaired by cold rolling and classified in hardness by the number of B&S Gages of rolling (reduction in thickness) from the previous annealing page. Rated excellent for soft-soldering; gold for silver alloy brazing or oxyacetylene welding and fair for resistance of carbon arc welding. Used for drawn cartridges, tubes, eyelet machine items, snap fasteners, etc.
A diamond penetrator, conical in shape, used with a Rockwell hardness tester for hard metals.
A piece of equipment used for bending sheet; also called a "bar folder." If operated manually, it is called a "hand brake"; if power driven, it is called a "press break."
A process of annealing a ferrous alloy in a suitable closed metal container, with or without packing materials, in order to minimize oxidation. The charger is usually heated slowly to a temperature below the transformation range, but sometimes above or within it, and is then cooled slowly. This process is also called "close annealing" or "pot annealing." See black annealing.
Ingot mold, with the top constricted; used in the manufacture of "capped steel," the metal in the constriction being covered with a cap fitted into the bottleneck, which stops "rimming" action by trapping escaping gases.
(Chemical Symbol B)- Element N. 5 of the periodic system. Atomic weight 10.82. It is gray in color, ignites at about 1112?F and burns with a brilliant green flame, but its melting point in a non-oxidizing atmosphere is about 4000?F Boron is used in steel in minute quantities for one purpose only-to increase the harden ability as in case hardening and to increase strength and hardness penetration.
The coating of steel with a film composed largely of zinc phosphate in order to develop better bonding surface for paint or lacquer.
(Concerning space lattices.) Having the equivalent lattice points at the corners of the unit cell, and at its center; sometimes called centered, or space-centered.
[See Tempered Spring Steel Strip.] ?BLUING -(1] Sheets-A method of coating sheets with a thin, even film of bluish-black oxide, obtained by exposure to an atmosphere of dry steam or air, at a temperature of about 1000 F, generally this is done during box- annealing. (2] Bluing of tempered spring steel strip; an oxide film blue in color produced by low temperature heating.
A process of softening ferrous alloys in the form of hot rolled sheet, by heating in the open furnace to a temperature within the transformation range and then cooling in air. The formation of bluish oxide on the surface is incidental.
A cavity produced during the solidification of metal by evolved gas, which in failing to escape is held in pockets.
A mill used to reduce ingots to blooms, billets, slabs, sheet-bar etc., (See Semi-finished Steel).
(Slab, Billet, Sheet-Bar.] Semifinished products, hot rolled from ingots. The chief differences are in their cross sectional areas in ratio of width to thickness, and in their intended use.