Steel section library · EN 10025 / EN 10210 / EN 10219

Interactive steel section library

A comprehensive database of geometric and mechanical properties for standard structural steel sections, including IPE, HEA, HEB and HEM profiles (EN 10025), circular hollow sections CHS (EN 10210 and EN 10219), rectangular RHS and square SHS hollow sections (EN 10210 and EN 10219), and equal-leg angles (EN 10056). For each profile, the following properties are provided: cross-sectional area A, height h, width b, flange and web thicknesses t_f and t_w, second moments of area I_y and I_z, elastic section moduli W_el, plastic section moduli W_pl, radii of gyration i_y and i_z, torsional constant I_t, and warping constant I_w.

Use the search field to quickly find a section by designation (e.g. “IPE 300”, “HE 200 A”, “CHS 168.3”) or browse the tables by size. Click the last icon in each row to display a dimensioned cross-section drawing, ready to include in a calculation report. Data is extracted directly from EN standard tables and is compatible with Eurocode 3 verification tools available on CalcoloStrutturaleMDP.

Second moments of area I_y and I_z
I_y refers to the strong axis (y-axis, in the plane with the larger dimension) and I_z to the weak axis. They determine flexural stiffness and are used directly in EC3 resistance and stability checks.

Elastic W_el and plastic W_pl section moduli
W_el = I/y_max is the elastic modulus (used for Class 3 sections). W_pl = S_sup + S_inf is the plastic modulus, sum of the static moments of the upper and lower halves about the plastic neutral axis (used for Class 1 and 2 sections). The ratio W_pl/W_el = α_pl is the shape factor.

Torsional constant I_t and warping constant I_w
I_t is the St. Venant torsional constant: it measures the basic torsional stiffness of the section. I_w is the warping constant: it quantifies the warping contribution in non-uniform torsion, becoming significant in the presence of a torsion gradient and producing resistive effects when warping is restrained.

Radii of gyration i_y and i_z
The radius of gyration i = √(I/A) expresses the distribution of area about the relevant axis. It is used to calculate the slenderness λ = L_cr/i in buckling checks.

Sources: EN 10025-2 · EN 10210-2 · EN 10219-2 · EN 10056-1 · ECCS Publication No. 83

Legend Symbols and units

Geometric dimensions

hmmTotal section height

bmmFlange width

t_wmmWeb thickness

t_fmmFlange thickness

rmmRoot radius

tmmWall thickness (hollow sections)

DmmOutside diameter (CHS)

y_G=z_GcmCentroid distance from outer edge (angles)

Section properties

Gkg/mMass per unit length

Acm²Cross-sectional area

A_vzcm²Shear area in web plane (EN 1993-1-1: A − 2·b·t_f + (t_w + 2r)·t_f)

A_Lm²/mLateral surface area per unit length

Second moments of area

I_y, I_zcm⁴Second moment of area about y and z axes

i_y, i_zcmRadius of gyration about y and z axes

I_tcm⁴Torsional constant (St. Venant)

I_wcm⁶Warping constant

J_ucm⁴Second moment of area about principal axis u (angles)

J_vcm⁴Second moment of area about principal axis v (angles)

Section moduli

W_el,ycm³Elastic section modulus about y axis

W_el,zcm³Elastic section modulus about z axis

W_pl,ycm³Plastic section modulus about y axis

W_pl,zcm³Plastic section modulus about z axis

W_elcm³Elastic section modulus (symmetric sections: single value)

W_plcm³Plastic section modulus (symmetric sections: single value)

W_el,vcm³Elastic section modulus about principal axis v (angles)

C_tcm³Torsional modulus (closed hollow sections)

Notes on hollow sections (CHS / SHS / RHS)

I = I_t/2For circular hollow sections: torsional constant I_t = 2I; torsional modulus C_t = I_t/(D/2) for CHS

EN 10210Hot finished hollow sections

EN 10219Cold formed hollow sections