IPE vs HEA vs UB — Steel Section Comparison Guide

Understanding the differences between major steel section families used worldwide is essential for structural engineers who work across regions, specify imported steel, or compare designs from different code traditions.

This article provides a practical guide to the most common hot-rolled I-section families. It is intended to help you:

understand what each section family name means and where it originates,
recognize the geometric patterns that distinguish one family from another,
choose the right family for a given structural role, and
avoid common mistakes when substituting sections across families.

This is a comparison and selection guide. It does not reproduce proprietary section tables or design values, and it does not replace the relevant product standards or design codes.

Copyright and standards notice

Steel section dimensions and properties are typically published by steel producers, standards bodies, and industry associations and may be subject to copyright or commercial licensing. This site does not reproduce copyrighted section tables, proprietary property databases, or manufacturer catalogues verbatim. Any discussion of section families on this page is high-level, non-exhaustive, and intended to help users understand terminology and selection workflows. Always consult the official published product standard (e.g., EN 10365, BS 4-1, ASTM A6) and the relevant producer documentation for authoritative dimensions and tolerances.

1) Section family overview

The global steel market uses several distinct I-section families, each originating from a different regional tradition:

IPE (European I-beam): A series of I-sections defined in European product standards. IPE sections have relatively narrow flanges compared to their depth, making them efficient as beams in bending.
HEA and HEB (European wide-flange): Broader-flanged European sections. HEA sections are lighter (thinner flanges) and HEB sections are heavier (thicker flanges) for the same nominal depth. Both are commonly used as columns or short-span beams where lateral stability or biaxial bending matters.
UB and UC (British sections): Universal Beams and Universal Columns used in British, Australian, and several Commonwealth design traditions. UBs are deeper and narrower; UCs are roughly square in proportion.
W-shapes (American wide-flange): The dominant I-section series in North American practice, defined by ASTM standards and catalogued by AISC. W-shapes cover a wide range of depth-to-width ratios.

Each family has its own naming convention. IPE and HEA/HEB are identified by nominal depth in millimeters (e.g., IPE 300, HEA 200). UB and UC sections use a serial size and mass notation (e.g., 610 UB 101). W-shapes use nominal depth in inches and weight per foot (e.g., W14x22).

2) Geometric differences

While all these sections are I-shaped, they differ systematically in several geometric proportions:

Depth-to-width ratio: IPE sections have the highest depth-to-width ratio (narrow flanges), making them material-efficient in strong-axis bending. HEA and HEB sections are squarer. UB sections fall between IPE and UC proportions.
Flange thickness patterns: Within each family, flange thickness generally increases with mass. HEB flanges are consistently thicker than HEA flanges at the same nominal depth. UC flanges are thicker than UB flanges for comparable serial sizes.
Fillet radius and root geometry: European sections (IPE, HEA, HEB) typically specify a fillet radius at the web-flange junction. British sections also define a root radius but use slightly different conventions. These details affect calculated section properties and connection detailing.
Taper vs. parallel flanges: Modern hot-rolled sections in all families use parallel flanges. Older British sections (now largely superseded) had tapered flanges. Always confirm you are referencing the current parallel-flange series.

3) When to use each family

Section selection depends on the structural role, the governing design code, and regional availability:

IPE sections are a natural choice for simply supported beams where depth is acceptable and strong-axis bending dominates. Their high depth-to-width ratio maximizes moment of inertia per kilogram.
HEA and HEB sections suit columns, short-span beams, and members with significant biaxial bending or axial compression. The broader flanges provide better weak-axis properties and improved lateral-torsional buckling resistance.
UB and UC sections are the standard choice in British and Australian practice. Designers working to AS 4100 or BS EN 1993 with UK National Annex will typically specify from the UB/UC range because local fabricators stock these sections.
W-shapes are used throughout North America. AISC design guides, software defaults, and fabricator inventories all revolve around the W-shape catalogue.

In general, use the section family that aligns with your design code, your fabricator's inventory, and your project's geographic context.

4) Property comparison approach

When comparing sections across families, avoid simple name-matching (e.g., "IPE 300 is the same as UB 305"). Instead, compare on the basis of structural demand:

Moment of inertia (I_x): The primary measure for beam deflection. Compare sections that provide similar I_x values, not similar names.
Plastic section modulus (Z_x or W_pl): The key property for bending capacity at the ultimate limit state. Two sections with similar Z_x values will have similar bending resistance, regardless of family.
Mass per unit length (kg/m): The proxy for cost. When two sections from different families provide similar capacity, the lighter one is generally more economical.
Flange width to depth ratio (b_f / d): A useful indicator of lateral stability and connection geometry. Wider flanges relative to depth provide better resistance to lateral-torsional buckling.

The section properties database on this site allows you to filter and sort across families so these comparisons can be done quickly.

5) Regional availability and specification

Specifying a section that your fabricator cannot procure locally defeats any theoretical efficiency gain. Consider:

European mills produce IPE, HEA, HEB, and HEM sections as standard. Availability of UB/UC sections in continental Europe may require import or longer lead times.
UK and Australian mills produce UB, UC, and related sections. IPE and HEA sections are available through import but are not standard stock for most domestic fabricators.
North American mills produce W-shapes, HSS, and related ASTM-defined sections. European section families are not standard domestic stock.
Material grade alignment: Section family and material grade go together. European sections are typically supplied to EN 10025 grades (S235, S275, S355). British sections may reference the same EN grades or older BS grades. W-shapes are supplied to ASTM A992 or A36. Substituting a section family may also require re-checking the material grade assumption.

Always confirm availability and lead time with the fabricator before finalizing a section selection from a non-local family.

6) Common mistakes

Assuming exact equivalence between families. An IPE 300 and a W12x26 are not interchangeable just because they have similar depths. The properties, tolerances, and material grades differ.
Mixing section families on the same project. Using IPE beams with UC columns creates procurement complexity, complicates connection detailing, and increases the risk of specification errors.
Ignoring local availability. Specifying HEB sections for a project fabricated in Australia, or UB sections for a project in Germany, without confirming supply creates schedule and cost risk.
Comparing by name instead of by property. Section names are catalogue identifiers, not performance indicators. Always compare on the basis of the structural property that governs your design.
Overlooking connection implications. Different section families have different flange widths, web thicknesses, and fillet radii. A connection detail designed for a UB may not fit an IPE of similar depth.
Forgetting to update the design code reference. If you change from a UB to an IPE, you may also need to change the design code, National Annex, or material specification. These are coupled decisions.

FAQ

What is the difference between IPE and HEA? IPE sections have narrow flanges relative to their depth, making them efficient as beams. HEA sections have broader flanges relative to their depth, giving them better weak-axis properties and making them more suitable as columns or members with biaxial loading.

Can I substitute a UB for an IPE? Not directly by name. You need to find a UB that matches the required structural property (e.g., moment of inertia or plastic modulus) and then confirm that the connection details, material grade, and local availability are compatible.

Which section is lightest for a given moment capacity? Generally, deeper sections with narrower flanges (like IPE or deep UB sections) are lighter for a given strong-axis bending capacity, provided lateral-torsional buckling is adequately restrained.

Are HEB sections always heavier than HEA? Yes. For the same nominal depth, HEB sections have thicker flanges and webs than HEA sections, resulting in higher mass per meter and higher section properties.

Why do Australian engineers use UB sections instead of IPE? Because Australian steel mills and stockholders supply UB and UC sections as standard stock. AS 4100 and Australian design practice are built around these section families, and local fabricators are familiar with their detailing conventions.

How do I compare sections from different families in the calculator? Use the section properties database to filter by the structural property that governs your design (e.g., I_x, Z_x, or mass per meter). Sort and compare across families rather than matching by name or nominal depth.

Do all section families use the same material grades? No. European sections are typically supplied to EN 10025 grades, British sections may use EN or legacy BS grades, and American W-shapes are supplied to ASTM grades. The material grade affects both capacity and weldability.

What if a section family I need is not in the database? The database covers the most commonly specified families. If you need a section not listed, you can enter custom dimensions in the calculator. Always verify custom inputs against the official product standard.

Disclaimer (educational use only)

This page is provided for general technical information and educational use only. It does not constitute professional engineering advice, a design service, or a substitute for an independent review by a qualified structural engineer. Any comparisons, descriptions, and workflows discussed here are simplified descriptions intended to support understanding and preliminary estimation.

All real-world structural design depends on project-specific factors (loads, combinations, stability, detailing, fabrication, erection, tolerances, site conditions, and the governing standard and project specification). You are responsible for verifying inputs, validating results with an independent method, checking constructability and code compliance, and obtaining professional sign-off where required.

The site operator provides the content "as is" and "as available" without warranties of any kind. To the maximum extent permitted by law, the operator disclaims liability for any loss or damage arising from the use of, or reliance on, this page or any linked tools.