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What are hollow sections according EN 10210?

12 October 2015
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Hollow sections according EN 10210 are nowadays one of the most versatile and the most frequently used (semi)products made from steel.

 

Hollow sections are used in the construction industry, mechanical engineering, automotive, aerospace and other industries. Without them, many of today's buildings would have been impossible to build, and certain mechanical and technical solutions would be hardly feasible.

There are two types of steel hollow sections and they are distinguished by the method of production:
- cold formed hollow sections
- hot formed hollow profiles

 

Cold formed hollow sections are formed in a process where most of the forming of tube is performed at room temperature or ambient temperature, and the final product is delivered without additional heat treatment. (Welding and aftertreatment of seam are not considered as heat treatment). The way of production and supply is determined by the European standard EN 10219 -

Cold formed welded structural sections of non-alloy and fine grain steels

The method of production of hot formed hollow section is quite different. This ultimately results in certain differences in tolerance, performance, and mechanical properties, in at first glance identical hollow profiles.

 

Hot formed hollow sections can be produced in two ways:
hot forming - with or without additional heat treatment (seamless hollow sections)
cold forming, with additional heat treatment (welded hollow sections which the removed seam)

They can be delivered in the normalized or normalized rolled state.
Hot rolled hollow profiles produced by the method of heat treatment, where the final forming is performed at temperatures from 700 ° to 900 ° C, which is the range of normalization.

 

The standard EN 10210 - Hot finished seamless structural hollow sections of non-alloy and fine grain steels accurately determines the way of production, supply, labeling and permitted tolerance

EN 10210-1: 2006 - defines the technical requirements for the delivery of round, square and rectangular cold formed hollow sections (EN 10210: 2008 - the first part)
EN 10210-2: 2006 - specifies tolerances, dimensions and sectional properties (EN 10210: 2008 - the second part)

Standard EN 10210, among others determines unambiguous labeling of products

  • for hot formed non-alloy steel hollow sections the steel designation consists of

    • the number of European Standard – EN 10210

    • capital letter S for structural steel

    • indication that shows the required minimum yield strength for thickness ≤16 mm expressed in MPa

    • capital letters that indicate bending rupture that material can withstand

      • JR at room temperature

      • J0 at temperature of 0°C

      • J2 and K2 at temperature of -20°C

    • capital letter H which indicates hollow sections

  • for fine grain steel structural hollow sections the steel designation consists of

    • the number of European Standard – EN 10210

    • capital letter S for structural steel

    • indication that shows the required minimum yield strength for thickness ≤16 mm expressed in MPa

    • capital letter N to indicate normalized or normalized rolled

    • capital letter L for the qualities with specified impact properties at -50°C

    • capital letter H to indicate hollow sections

 

Example of labeling for alloy steel:
There's a demand for hot rolled hollow section of structural steel with a minimum yield strength for the smallest thickness range - 355 MPa and impact strength of 27J at -20 ° C.
Based on these data the correct label is: EN 10210 S355J2H.

Standard EN 10210 prescribes the product labels according to the form:

HFCHS (Hot Finished Circular Hollow Sections)

HFRHS (Hot Finished square or Rectangular Hollow Sections)

HFEHS (Hot Finished Elliptical Hollow Sections)

The most common materials used for the production of hot formed hollow profiles

quality

EN 10027-2

DIN

JUS

S235 JRH

1.0039

R St 37-2

Č0361

S275 JOH

1.0149

St 44-2

Č0451

S275 J2H

1.0138

St 44-3

Č0452

S355J2H

1.0576

St 52-3

Č0563

 

EN 10210 - the prescribed tolerances for hot-rolled hollow sections of non alloy fine grain steels:

External dimensions (width, height, diameter)

+ -1%, minimum of + -0.5 mm (round sections max. 10 mm)

The wall thickness (T)

-10%

Concavity/ Convexity

1 %

Angularity

90° +-1°

Flatness

0,20% to the overall length, 3 mm in arbitrary length of 1 m

Weight

+/- 6% excluding the actual length

 

What are the advantages of hot-rolled hollow sections?

  • high static values allow high loads
  • unlimited welding, including the corners of rectangular and square profiles
  • high values of the bending rupture at low temperatures
  • optimum safety thanks to an equitable distribution of hardness and low residual stress
  • structural advantages thanks to a small radius corners, and large connecting surfaces of square and rectangular profiles
  • excellent visuals impression with no sharp edges and external seams
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