| BETA RATIO (#) | (english) The amount, expressed as a ratio, of particles in a fluid stream upstream of a filter, after the fluid posses through a filter, divided by the amount of particles downstream, for a particular size particle. |
| Billet container | (english) The part of the extrusion press into which the billet to be extruded is placed. |
| Blast Furnace | (english) 1) A furnace in which solid fuel (limestone, coke, iron ore) is combined with high-pressure, hot air blast (120,000 psi) to smelt ore in a continuous process (They are never stopped. They can be slowed down or idled). A Blast Furnace in the iron and steel industry is used to produce liquid iron. |
| Blocker | (english) Preform die or impression, used when part cannot be made in a single operation. |
| Boiler | (english) A closed vessel in which water, is transformed into steam at a given pressure and temperature under controlled conditions. |
| Bolster (die block) | (english) A “tool” or reinforcing part which supports the backer-which, in turn, supports an extruding die against the pressure of extrusion. |
| Brake | (english) 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 brake. |
| Brake Press Bending | (english) An operation which produces various degree bends when fabricating parts from steel. |
| Break Test (for tempered steel) | (english) A method of testing hardened and tempered high carbon spring steel 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 ranges. |
| BREATHER | (english) A device which permits air to move in and out of a container or component to maintain atmospheric pressure. |