Spring steels: Carbon-manganese spring steels, Hyper-eutectoid spring steels, Silicon-manganese spring steels

Spring steels

Spring steels are used for the
making springs. Various types of these steel along with their composition and
uses are discussed as under.

Carbon-manganese spring steels

This
type of steel contains

C = 0.45  to 0.6, Si = 0.1 to  0.35%
and Mn = 0.5 to 1.0%.

These steels are quenched and tempered up to 350 BHN.
They are widely used for laminated springs for railway and general purposes.

Hyper-eutectoid spring steels

This
type of steel contains

C 
=  0.9 to 1.2%,  
Si =  0.3% (max) and Mn = 0.45 to 0.70%.

These steels are oil quenched and tempered at low
temperature. This type of steel is
used for volute and helical springs.

Silicon-manganese spring steels

This type of steel contains

C = 0.3  to 0.62%, Si = 1.5 to  2% and Mn = 0.6 to 1 %.

These steels are hardened and tempered. This type of
steel is used for the manufacturing of railway and road springs generally.

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