Blush |
(english) A coating defect consisting of the whitening of a cured film which results in a translucent or opaque appearance with accompanying loss of gloss. Blushing usually occurs during the pasteurization or steam processing of films which are undercured or water sensitive. |
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. |
BOLT KIT |
(english) A set of bolts or screws that ore selected to suit a particular application, i.e. pre-selected length, threads and strength to match the mounted component. |
Bonderizing |
(english) The coating of steel with a film composed largely of zinc phosphate in order to develop a better bonding surface for paint or lacquer. |
Boring Tool |
(english) A cutting tool in which the tool bit,the boring bar and in some cases the tool holder are incorporated. |
Boron (chemical symbol B) |
(english) Element N. 5 of the periodic system. Atomic weight 10.82. It is gray in color, ignites at about 1112 (degrees) F. and burns with a brilliant green flame, but its melting point in a non-oxidizing atmosphere is about 4000 (degrees) F. Boron is used in steel in minute quantities for one purpose only- to increase the hardenability as in case hardening and to increase strength and hardness penetration. |
Boron Steels |
(english) The addition of boron in the range 0.0005-0.005% to certain steels increases the hardenability. A range of boron steels is now listed in the current BS 970 and are widely used for the production of cold headed fastenings. |
Boss |
(english) A projection or an enlarged section of a casting through which a hole may be machine. |
Bottle Top Mold |
(english) Ingot mold, with the top constricted; used in the manufacture of capped steel, the metal in the constriction being covered with a cap fitting into the bottle-neck, which stops rimming action by trapping escaping gases. |