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File:Steel pd.svg

Description
English: Steel phase diagram

Iron-carbon phase diagram under atmospheric pressure

This diagram is limited by pure iron on the left and by iron carbide on the right. The mains phases are:

   * α iron: ferrite, ferritic steel
   * γ iron: austenite, austenitic steel
   * iron carbide: cementite, Fe3C.

We can see a eutectic and a eutectoid; these phases crystallise as a stacking of fine strips of pure phases (iron and cementite) in case of the eutectoid, or a pure iron containing small balls of cementite for the eutectic. Although it is heterogeneous, these phases behave like homogeneous pure bodies.

Steel is between 0 and 2.06 mass percent of carbon. Cast iron is between 2.06 and 6.67%.

Note that this diagram is for illustrative purposes only, and is not thermodynamically accurate.

SVG Author : en:User:User A1

Original Author : Christophe Dang Ngoc Chan
Date 2007-12-06 (original upload date)
Source Transferred from en.wikipedia; transferred to Commons by User:Pieter Kuiper using CommonsHelper.
Author Original uploader was User A1 at en.wikipedia
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Released under the GNU Free Documentation License; GFDL.
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