the iron iron carbide phase diagram n.
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The Iron-Iron Carbide Phase Diagram. Heat Treatment of Steel. Features. Phases present. L. a ferrite Bcc structure Ferromagnetic Fairly ductile. d Bcc structure Paramagnetic. g austenite Fcc structure Non-magnetic ductile. Fe 3 C cementite Orthorhombic Hard brittle. Reactions.

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features
Features

Phases present

L

a ferrite

Bcc structure

Ferromagnetic

Fairly ductile

d

Bcc structure

Paramagnetic

g austenite

Fcc structure

Non-magnetic

ductile

Fe3C cementite

Orthorhombic

Hard

brittle

Reactions

Peritectic L + d = g

Max. solubility of C in ferrite=0.022%

Max. solubility of C in austenite=2.11%

Eutectic L = g + Fe3C

Eutectoid g = a + Fe3C

steels
Steels

Steel is an interstitial solid solution of carbon in iron.

Theoretically steel has a maximum of 2.11% carbon.

In practice, the amount of carbon rarely exceeds 0.8%

Classification/Nomenclature

Low carbon steels up to 0.2%C

Medium carbon steels 0.2-0.4%C

High carbon steels >0.4% C

AISI 1020:

Last two numbers indicate

Amount of carbon :0.2%C

10 indicates plain carbon steel

AISI 4340: 0.4%C

43 indicates alloy steel