What is the shear strength coefficient for cold-rolled steels?

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Ekhlas Edan

it is the ratio of shear stress to yield stress

if it is equal to one the material slid

Erik Carton

According to von Misses plasticity theory a value of Y/3^0.5 (square root of 3) is a good approximation of the shear strength of a metal with tensile strength Y.

Mehmet Ali Akbulut

This is the general form for all metals.

Do we have the coefficient we use for only steels ?

Steels are a very wide family of iron alloys; if you use a specific steel type (and hardening condition) you may be able to find a better estimate.

we use a specific steel type EN10060( cold round steel bar).