Quality Terms and Procedures:
Cold Reduced Strip
Metal strip, made from hot - rolled strip, by rolling on cold – reduction mills.
Rolling metal at a temperature below the softening point of metal to create strain hardening. Cold rolling changes the mechanical properties of strip and produces a combination of hardness ductility stiffness etc. known as temper.
Increase in length which occurs before a metal is fractured, when subjected to stress. This is usually expressed as a percentage of the original length and is a measure of the ductility of the metal.
Maximum alternating stress which a given material will withstand for an indefinite number of times without causing fatigue failure.
Hardness is defined as the resistance of material to local plastic deformation Achieved from indentation of predetermined geometric indenter on to a flat surface of metal under a predetermined load.
Degree to which a metal will resist cutting, abrasion, penetration, bending and stretching. The indicated hardness of metals will differ somewhat with the specific apparatus and technique of measuring. For details concerning the various types of apparatus used in measuring hardness. (See Brinell Hardness, Rockwell Hardness, Vickers Hardness, Scleroscope Hardness.) Tensile Strength also is an indication of hardness.
Altering the properties of a metal by subjecting it to a sequence of temperature changes, time of retention at specific temperature and rate of cooling therefrom being as important as the temperature itself. Heat treatment usually markedly affects strength, hardness, ductility, malleability, and similar properties of both metals and their alloys.
Particles of impurities (usually oxides, sulfides, silicates, etc) that are held mechanically or are formed during the solidification or by subsequent reaction within the solid metal.
The resistance of a material to indentation. This is the usual type of hardness test , in which a pointed or rounded indenter is pressed into a surface under a substantially static load.
(Chemical symbol Mn.) – Element No25 of the periodic system; atomic weight 54.93. Lustrous, reddish – white metal of hard brittle and, Ferromanganese for steel manufacture as well as in manganese and many copper – base alloys. Its principal function is as an alloy in steel making:
1. It is ferrite – strengthening and carbide forming element. It increases hardenability inexpensively, with a tendency toward embrittlement when too high carbon and too high manganese accompany each other.
2. It counteracts brittleness from sulfur.
A distinctive needle-like structure existing in stel as a transition stage in the transformation of austenite. It is the hardest constituent of steel of eutectoid composition. It is produced by rapid cooling from quenching temperature and is the chief constituent of hardened carbon tool steels. Martensite is magnetic.
Any spring produced by cold forming from any material with or without subsequent heat treatment.
Medium-carbon steels are similar to low-carbon steels except that they contain carbon from 0.30% to 0.60% and manganese . Increasing the carbon content to approximately 0.5% with an accompanying increase in manganese allows medium-carbon steels to be used in the quenched and tempered condition
Contains from 0.30% to 0.60% carbon and less than 1.00% manganese. May be made by any of the standard processes.
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