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ผลการค้นหา

ค้นเจอ 450 รายการ

Boring Tool

(english) A cutting tool in which the tool bit,the boring bar and in some cases the tool holder are incorporated.

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.

Chlorofluorocarbons

(Environmental Engineering) Synthetic organic compounds used for refrigerants, aerosol propellants (prohibited in the U.S.), and blowing agents in plastic foams. CFCs migrate to the upper atmosphere destroying ozone and increasing global warming. Typical atmospheric residence times are 50 to 200 years.

Dissolved oxygen (DO)

(Environmental Engineering) The amount of molecular oxygen dissolved in water.

Bloomery

(english) A primitive furnace used for direct reduction of ore to iron.

Brine

(english) A saltwater solution for quenching or cooling when heat treating steel.

Abrasive Wheels

(english) Wheels of a hard abrasive, such as Carborundum used for grinding.

Bessemer Process

(english) A process for making steel by blowing air through molten pig iron contained in a refractory lined vessel so that the impurities are thus removed by oxidation.

Actual Weight

(english) The customer buys by the actual (scale) weight of the steel. The theoretical weight is used in estimating, however, it is not to be used for billing.

Inertia:

(english) The tendency of an object at rest to remain at rest, and of an object in motion to remain in motion.

Gillmore Needle

(Concrete Engineering) A device used in determining time of setting of hydraulic cement, described in ASTM 0 266. Gradation The sizing of granular materials; for concrete materials, usually expressed in terms of cumulative percentages larger or smaller than each of a series of sieve openings or the percentages between certain ranges of sieve openings.

Band Saw Steel (Wood)

(english) A hardened tempered bright polished high carbon cold rolled spring steel strip produced especially for use in the manufacture of band saws for sawing wood, non ferrous metals, and plastics. Usually carries some nickel and with a Rockwell value of approximately C40/45.

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