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Basic Iron/Carbon Phase Graph

This graph shows the basic relationship of carbon content in steel when hardening with heat treatment, as the graph shows high carbon steels can become very hard at the cost of ductility.

Iron carbon phase graph

Ferrite Phase
-High ductility
-Poor tensile strength
-Low hardness

Pearlite Phase
-High tensile strength
-Increasing hardness
-Less ductility

Cementite Phase
-Brittle
-Low ductility
-Lower tensile strength

Low Carbon

Mild Steel

Medium Carbon

High Carbon

Applications:
-Car body panels
-Filing cabinets
Properties:
-Malleable
-Very ductile
-Soft

Applications:
-Automotive parts
-Brackets
Properties:
-Low hardness
-Medium tensile strength
-Good ductility

Applications:
-Hammers
-Chisels
Properties:
-Medium hardness
-Good tensile strength
-Medium ductility

Applications:
-High speed tooling
Properties:
-Hard
-Brittle
-Low ductility


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