A process that reduces the amount of hardness in metal by reheating the metal below the critical temperature.


Related Terms

CARBONATE HARDNESS

That hardness caused in water by bicarbonates and carbonates of calcium, and magnesium.

HARDNESS CONTROL

An action designed to remove hardness and at the same time to produce an equivalent amount of suspended solids.

WATER SOFTENER

A device or system used to remove calcium and magnesium hardness minerals from a water supply.

ZEOLITE

A natural mineral (hydrous silicates) that has the capacity to absorb hardness, calcium, and magnesium ions from water.

HARDNESS

A measure of the amount of calcium and magnesium salts in boiler water . Usually expressed as grains per gallon or parts per million as CaCO2

HARDNESS

The ability of a material to resist to forceable penetration or plastic deformation.

SCALE

A deposit of medium to extreme hardness occurring on water heating surfaces of a boiler because of an undesirable condition of boiler water.

HARDWOOD

A description applied to woods from deciduous broad-leafed trees (Angiosperms). The term has no reference to the actual hardness of the wood.

BIERBAUM SCRATCH HARDNESS TEST

A test for the hardness of a solid sample by microscopic measurement of the width of scratch made by a diamond point under preset pressure.

BRINELL NUMBER

A hardness rating obtained from the Brinell test; expressed in kilograms per square millimeter.

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