EN 10219 Cold-Formed Welded Structural Hollow Sections

EN 10219  standard is a very important European standard. Its full title is "Cold-Formed Welded Structural Hollow Sections - Part 1: Technical Delivery Conditions" and "Part 2: Dimensions and Sectional Properties."

Simply put, EN 10219 specifies the material, manufacturing, dimensions, tolerances, mechanical properties, and inspection requirements for cold-formed (cold-finished) welded hollow sections (such as square tubes, rectangular tubes, and round tubes) used in building and engineering structures.

Core Components of the Standard:

EN 10219 is divided into two main parts:

EN 10219-1: Technical Delivery Conditions

Material Requirements: These specify the steel grade and properties used in the manufacture of the tubes, typically based on the steel specified in EN 10219 itself or EN 10210 (Hot-Formed Hollow Sections).

Manufacturing Process: These specify that the tubes are formed by cold forming (cold bending) and then welded together at the edges. This differs from hot rolling or hot forming processes.

Welding Requirements: Stringent standards are set for welding procedures, welder qualifications, and weld quality (such as nondestructive testing) to ensure weld strength and integrity.

Mechanical Properties: Specifies the minimum mechanical properties that steel must meet, including:

Yield Strength (ReH): The stress at which a material begins to permanently deform.
Tensile Strength (Rm): The maximum stress a material can withstand before breaking.
Elongation (A): The ability of a material to stretch before breaking, an indicator of its toughness.

Inspection and Testing: Specifies the types of tests required (such as tensile tests, impact tests, flattening tests, expansion tests, etc.) and the frequency of testing.
Dimensions and Tolerances: Used in conjunction with Part 2, specifies the permissible deviations from dimensions.

Marking and Certification: Specifies how products should be marked (such as standard number, steel grade, size, manufacturer, etc.) and what compliance documentation is required (such as the Factory Production Control Certificate (FPC)).

EN 10219-2: Dimensions and Sectional Properties

This part provides detailed dimensions, sectional properties (such as cross-sectional area, moment of inertia, section modulus, etc.), and tolerance tables for square, rectangular, and round tubes.

Engineers and designers use the data and tables in this part for structural calculations and design.

EN 10219-2: Dimensions and Sectional Properties

This part provides detailed dimensions, sectional properties (such as cross-sectional area, moment of inertia, section modulus, etc.), and tolerance tables for square, rectangular, and circular tubes.

Engineers and designers use the data and tables in this part for structural calculations and design.

Features and Differences between EN 10219 and EN 10210:

Cold Forming vs. Hot Forming: This is the fundamental difference between EN 10219 and another important standard, EN 10210.

EN 10219: Cold forming. Steel sheet or strip is cold-formed at room temperature into the desired shape and then welded. This method produces tubes with thinner walls, more precise dimensions, and a smoother surface finish.

EN 10210: Hot forming. Steel billets are pierced, rolled, or extruded at high temperatures. Hot-formed tubes typically have thicker walls and larger outer radii at corners (square/rectangular tubes).

Common steel grades:

EN 10219 covers a variety of steel grades, the most common of which are the S series (structural steel) and the L series (pipeline steel). Examples include:
S235JRH, S275J0H, S275J2H, S355J0H, S355J2H, and S355K2H.
L245NB, L290NB, and others are more commonly used in pipeline applications.

The "H" suffix indicates that the steel is suitable for hollow sections.

Applications of EN 10219 Standard Structural Steel:

EN 10219 standard hollow sections are widely used in various modern buildings and engineering structures due to their light weight, high strength, flexible and aesthetically pleasing design:

1. Building structures: Roofs and main structures of airport terminals, stadiums, commercial centers, office buildings, etc.
2. Space trusses and grid structures: Construction of large column-free spaces.
3. Machinery and equipment manufacturing: Hoisting machinery, agricultural machinery, vehicle chassis, etc.
4. Bridge construction: Pedestrian bridges and decorative bridge components.
5. Home furnishings and decoration: Furniture, stairs, guardrails, etc.

Conclusion:
EN 10219 is a comprehensive European product standard for cold-formed welded structural hollow sections. It ensures consistent quality, dimensions, and performance across products from different manufacturers, providing structural designers with a reliable design basis and guaranteeing the safety and reliability of the resulting building structures. In China, the corresponding national standard is GB/T 6728 "Cold-formed hollow steel sections for structures".

Read more: EN 10219 vs EN 10210: Comprehensive Comparison or ASTM A500 Structural Pipe