A steel that owes its special properties to elements other than carbon. Steel is considered a steel alloy when the range assigned to the content of the constituent elements exceeds one or more of the following limits:
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Manganese 1.65 percent
Silicon 0.60 percent
Copper 0.60 percent
or the presence of a certain limit or a certain minimum amount of each of the following elements within the limits defined in the field of structural steel alloys, is recognized or required:
Aluminum
Boron
Chromium (up to 3.99 percent) Cobalt
Columbium
Molybdenum
Nickel
Titanium
Tungsten
Vanadium
Zirconium
or any other alloy element that has been added to obtain a desired effect of the alloy.
The presence of small amounts of special elements in alloy steels is unavoidable. In many applications, these do not seem important and are not specified or required. If not specified or needed, they should not exceed the following values.
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Copper 0.35 percent
Chromium 0.20 percent
Nickel 0.25 percent
Molybdenum 0.06 percent