European vs American Steel Sections

Structural steel sections follow two major standardization systems: European (EN) and American (AISC). Differences between European vs American steel sections matters for international EPC projects, where specifications from one system must often be cross-referenced or substituted with profiles from the other. The two systems use different designation conventions, dimensional standards, material grades, and design codes.

European vs American Steel Sections Comparison

Feature	European (EN)	American (AISC)
Wide flange beams	HEA, HEB, HEM	W-shapes (e.g., W12x26)
I-beams	IPE, IPN	S-shapes (e.g., S12x31.8)
Channels	UPN, UPE	C, MC (e.g., C12x20.7)
Angles	RSA (EN 10056)	L-shapes (e.g., L4x4x1/4)
Hollow sections	SHS, RHS, CHS (EN 10210/10219)	HSS (ASTM A500)
Dimension units	Millimeters	Inches (depth) + lb/ft (weight)
Designation basis	Depth in mm (e.g., HEB 300 = 300 mm deep)	Depth in inches + weight in lb/ft (e.g., W12x26)
Material standard	EN 10025	ASTM A36, A572, A992
Design code	Eurocode 3 (EN 1993)	AISC 360 (LRFD/ASD)

Approximate Profile Equivalents

The following table provides approximate cross-references. These are not exact substitutes; section properties must be verified for each application.

European Profile	Approx. American Equivalent	Notes
HEA 200	W8x24	Similar depth; W-shape slightly heavier
HEB 200	W8x31	Close match in weight and section modulus
HEB 300	W12x50	Comparable moment of inertia
IPE 300	W12x26	IPE is lighter; S12x31.8 also similar depth
IPE 400	W16x31	Check section modulus for equivalence
UPN 200	C8x11.5	UPN is heavier for same depth
UPN 300	C12x20.7	Approximate match
RSA 100x100x10	L4x4x3/8	Close dimensional and weight match

Always verify moment of inertia, section modulus, and cross-sectional area before substituting profiles between systems.

Key Differences

Designation logic: European sections use depth in millimeters (HEB 300 = 300 mm deep). American W-shapes use nominal depth in inches plus linear weight in pounds per foot (W12x50 = approximately 12 inches deep, 50 lb/ft).

Flange geometry: European HEA/HEB beams and IPE beams have parallel flanges per EN 10034. American W-shapes also have parallel flanges per ASTM A6. However, European IPN beams and UPN channels have tapered flanges, whereas American S-shapes and C-channels also feature tapered flanges but with different taper ratios.

Material grades: European S355 (355 MPa yield) is roughly equivalent to American ASTM A572 Gr. 50 (345 MPa yield). European S275 corresponds approximately to ASTM A36 (250 MPa yield). The standard material for American W-shapes is ASTM A992 (345 MPa yield minimum).

Common Mistake

Assuming European and American sections with similar depth are interchangeable. A W12x26 and an IPE 300 are both approximately 300 mm deep, but the W-shape has wider flanges and a different weight, resulting in different section properties. Always compare moment of inertia and section modulus, not just depth.

For detailed dimension and weight tables of European structural steel profiles, refer to the pillar guides for HEA/HEB beams and IPE/IPN beams.

Read the full guide to structural steel beams