| Bimetal | (english) Casting, usually centrifugal, made of two different metals, fused together. |
| Binary Alloy | (english) An alloy containing two elements, apart from minor impurities, as brass containing the two elements copper and zinc. |
| Bismuth | (english) Chemical symbol Bi. A soft, course cystalline heavy metal with a silvery white color and pinkish tinge; usually produced as a by-product of copper,leaad and other metals. Has a thermal conductivity lower than all other metals except mercury. Used as alloying agent but leading use is in pharmaceuticals. |
| Bit, Tool (cutter) | (english) A hardened steel bar or plate that is shaped accordidng to the operation to be performed and the material to be machined. |
| Black Annealing | (english) A process of box annealing or pot annealing ferrous alloy sheet, strip or wire after hot working and pickling. |
| Black Iron | (english) Uncoated steel product. |
| Black Oil Tempered Spring Steel Strip (Scaleless Blue) | (english) A flat cold rolled usually .70/.80 medium high carbon steel strip, blue-black in color, which has been quenched in oil and drawn to desired hardness. While it looks and acts much like blue tempered spring steel and carries a Rockwell hardness of C44/47, it has not been polished and is lower in carbon content. Used for less exacting requirements than clock spring steel, such as snaps, lock springs, hold down springs, trap springs, etc. It will take a more severe bend before fracture than will clock spring, but it does not have the same degree of spring-back. |
| Black Plate | (english) A light weight or a thin uncoated steel sheet or strip so called because of its dark oxide coloring prior to pickling. It is manufactured by two different processes. (1) Form sheet bar on single stand sheet mills or sheet mills in tandem. This method is now almost obsolete. (2) On modern, high speed continuous tandem cold reduction mills from coiled hot rolled pickled wide strip into ribbon wound coils to finished gage. Sizes range from 12 to 32 in width, and in thicknesses from 55 lbs. to 275 lbs. base box weight. It is used either as is for stampings, or may be enameled or painted or tin or terne coated. |
| Blackening Scab | (english) A form of casting defect related to an improper coating rather than to the sand. |
| Blacking Hole | (english) Irregular-shaped surface cavities in a casting containing carbonaceous matter. Caused by spilling off of the blacking from the mold surface. |