Carbon Steel

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Steels and other iron–carbon alloy phases
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Ferrite Austenite Cementite Graphite Martensite
Microstructures
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Classes
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Other iron-based materials
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v t e
Carbon steel is a steel with carbon content up to 2.1% by weight. American Iron and Steel Institute (AISI) definition of Carbon Steel states:
Steel is considered to be carbon steel when:
no minimum content is specified or required for chromium, cobalt, molybdenum, nickel, niobium, titanium, tungsten, vanadium or zirconium, or any other element to be added to obtain a desired alloying effect;
the specified minimum for copper does not exceed 0.40 percent;
or the maximum content specified for any of the following elements does not exceed the percentages noted: manganese 1.65, silicon 0.60, copper 0.60.[1]
The term "carbon steel" may also be used in reference to steel which is not stainless steel; in this use carbon steel may include alloy steels.
As the carbon percentage content rises, steel has the ability to become harder and stronger through heat treating; however, it becomes less ductile. Regardless of the heat treatment, a higher carbon content reduces weldability. In carbon steels, the higher carbon content lowers the melting point.[2]