Engineering Materials
Steel contains

Elements like phosphorus, sulphur and silicon in varying quantities
80% or more iron
Alloying elements like chromium, tungsten nickel and copper
50% or more iron

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Engineering Materials
Stress relaxation is the phenomenon

In which deformation tends to loosen the joint and produces a stress reduced
In which parts are not loaded
Stress reduces on increasing load
In which stress remains constant on increasing load

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