| Burnthrough | (english) In shell molding, resin burned out too soon. |
| Burr | (english) The very subtle ridge on the edge of strip steel left by cutting operations such as slitting, trimming, shearing, or blanking. For example, as a steel processor trims the sides of the sheet steel parallel or cuts a sheet of steel into strips, its edges will bend with the direction of the cut. |
| Burr 2 | (english) Roughness left by a cutting operation such as slitting, shearing, blanking , etc. |
| Burr Mashers | (english) Devices used to remove build up on edge of strip after the slitting process. |
| BURST PRESSURE | (english) The level of pressure at which a component, pipe, tube, hose or other fluid passage will burst during application of internal pressure. Normally 2.5 - 4.0 times working pressure. |
| Busheling | (english) A widely traded form of steel scrap consisting of sheet clips and stampings from metal production. Bushel baskets were used to collect the material through World War II, giving rise to the term. |
| Bust Coil | (english) Coils removed from the off-gauge reel. The BUST (build up side trimmer) coil contains defects (gauge variation and quality defects) and off-spec widths. |
| Butcher Saw Steel | (english) A hardened, tempered, and polished high carbon spring steel strip material (carbon content is generally higher than that of a material used for wood band saw applications) with a Rockwell value of roughly C47/49. |
| Butt end | (english) The residual portion of an extrusion billet that is not forced through the die at the end of the extrusion cycle. |
| Butt Welding | (english) Joining two edges or ends by placing one against the other and welding them. |