What is Fe 415 in a steel structure?


In this blog we will be taking a close look at Fe 415, the choice of the common man/ woman for building his/her dream home. We will taking a detailed look on how different grades of steel react to different standards tests undertaken by the Government of India. The number 415 in this grade of steel simply refers to its yield strength. Below some of the characteristics by different grades are marked.


The increase in length of a tensile test piece under stress. The elongation at fracture is conventionally expressed as a percentage of the original gauge length of a standard test piece. Fe 415 Steel has elongation of 14.5%.

Tensile Strength

The maximum load reached in a tensile test divided by the effective cross-sectional area of the gauge length portion of the test piece (also termed as ultimate tensile stress).

Yield Stress

Stress (that is, load per unit cross sectional area) at which elongation first occurs in the test piece without increasing the load during the tensile test. In the case of steels with no such definite yield point, proof stress shall be applicable. Fe 415 Steel has an yield strength of 415.0.

0.2 Percent Proof Stress

The stress at which a non-proportional elongation equal to 0.2 percent of the original gauge length takes place. When it comes 0.2 % proof test of Fe 415, the yield stress is 540.0.

Longitudinal Rib

A uniform continuous protrusion, parallel to the axis of the bar/wire (before
cold-working, if any).

Transverse Rib

Any rib on the surface of a bar/wire other than a longitudinal rib.

Nominal Mass

The mass of the bar/wire of nominal diameter and of density 0.00785 kg/mm2 per meter.

Percentage Total Elongation at Maximum Force

The elongation corresponding to the maximum Load reached in a tensile test (also termed as uniform elongation). Fe 415 Steel has an elongation force (in%) is 5.

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