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EN 10210 S355 Square & Rectangular Hollow Sections

OD Range :

Square/rectangular tubes: side length 30 × 30 mm – 500 × 500 mm; round tubes: Ø 30 – 610 mm

WT Range :

3 – 40 mm

Length :

6 – 12 m

Tolerance :

Dimensions: ±2% or ±2 mm, Wall thickness: ±10% or ±1 mm, Length: ±10 mm

Material :

Non-alloy steel / Fine-grained steel; Common steel grades: S235, S275, S355

Standard :

EN 10210

Surface :

Bright hot-rolled finish, with rust-inhibiting oil coating, galvanized or painted.

Application :

Building structures, bridge engineering, mechanical supports, industrial plants, structural frames, steel structure engineering.

EN 10210 S355 square and rectangular steel tubes are high-strength, hot-formed structural steel tubes that, due to their excellent mechanical properties and flexible range of applications, have become one of the commonly used materials in engineering projects

I. Product Overview

The EN 10210 standard, fully titled “Hot Finished Structural Hollow Sections of Non-Alloy and Fine Grain Steels,” applies to hot-formed circular, square, and rectangular steel tubes. S355 is a steel grade, belonging to high-strength non-alloy steel, possessing good yield strength and tensile strength.
Square and rectangular hollow sections are widely used in structural design, capable of withstanding large bending moments and pressures while ensuring lightweight construction.

II. Mechanical Properties of EN 10210 S355 Square and Rectangular Tubes

ItemParameterDescription
Steel GradeS355High-strength non-alloy structural steel
Yield Strength ReH≥ 355 MPaLoad-bearing capacity of the pipe in the elastic deformation stage
Tensile Strength Rm470–630 MPaMaximum stress at tensile fracture
Elongation A (%)≥ 20%Post-fracture elongation, reflecting material ductility
Impact Toughness KV≥ 27 J (at room temperature)Energy absorption capacity to ensure structural safety under impact
Bending PerformancePipe can be smoothly cold-bent or hot-bentLow internal stress in hot-formed pipes; bending is less prone to cracking
HardnessHB 140–170Brinell hardness, reflecting steel strength and wear resistance

III. Application Scenarios of EN 10210 S355 Square & Rectangular Hollow Sections

1. Building Structures

EN 10210 S355 Square & Rectangular Hollow Sections are widely used in the frame structures of high-rise buildings, commercial complexes, and industrial plants. They serve as supporting beams, columns, and trusses, efficiently bearing both vertical and horizontal loads. Compared with solid steel members, these hollow sections offer a lighter weight while maintaining excellent load-bearing capacity, making them ideal for modern lightweight steel structures.

2. Bridge Engineering

In bridge construction, EN 10210 S355 Square & Rectangular Hollow Sections are commonly applied in trusses, railings, guardrails, and column supports. As hot-formed structural tubes, they feature low residual stress and superior bending and shear resistance, ensuring structural stability under long-term loads. They are suitable for urban bridges, highway bridges, and pedestrian bridges where strength and durability are critical.

3. Industrial Plants and Machinery Support

Square and rectangular hollow sections are extensively used in factory building frames, equipment supports, and pipe rack systems. Heavy machinery frames and steel structural supports can be designed with different wall thicknesses and side dimensions to match specific equipment weights and load conditions, ensuring safety and cost efficiency.

4. High-Rise Steel Structure Engineering

For high-rise residential and office buildings, hot-formed hollow sections are often used in steel structure frameworks, including truss beams, connecting columns, and wall frames. Compared with EN 10219 Cold-Formed Welded Square Hollow Section, hot-formed EN 10210 products offer better overall mechanical performance and more uniform material properties, contributing to higher structural reliability. Their dimensional accuracy also allows for efficient fabrication and fast on-site welding.

5. Machinery and Transportation Equipment

Square and rectangular hollow sections are widely applied in vehicle chassis, transport frames, lifting machinery, and various equipment frames. Their excellent load-bearing capacity and impact resistance make them suitable for demanding operating conditions in transportation and heavy-duty machinery industries.

IV. EN 10210 S355 Square and Rectangular Tube Selection Recommendations

1. Selecting Dimensions Based on Structural Load

  • The side length and wall thickness directly determine the load-bearing capacity of the tube.
  • Light-load structures (e.g., small sheds, indoor supports): 30×30 mm ~ 60×60 mm, wall thickness 3–5 mm
  • Medium loads (e.g., factory roof trusses, equipment supports): 80×80 mm ~ 150×150 mm, wall thickness 5–10 mm
  • Heavy-load structures (bridges, heavy machinery, steel structure frameworks): 200×200 mm ~ 500×500 mm, wall thickness 10–16 mm or thicker. For such applications, EN 10210 S355 Square & Rectangular Hollow Sections are often recommended due to their high strength and durability.

2. Selecting Surface Treatment Based on Environmental Conditions

  • Indoor dry environment: Bright hot-rolled tubes can be used directly, with only anti-rust oil applied.
  • Outdoor or humid environment: Galvanizing or painting is recommended to improve corrosion resistance.
  • Special corrosive environments (seaside, chemical plants): Hot-dip galvanizing + anti-corrosion coating can be considered to extend service life.

3. Selection based on construction and processing methods

  • Welding structures: EN 10210 S355 square & rectangular hollow sections have good welding performance and are suitable for TIG, MIG, and manual welding.
  • Bending processing: Hot-formed tubes have low internal stress, are less prone to cracking during bending, and are suitable for on-site construction or mechanical processing.
  • Custom length processing: Lengths can be cut according to project requirements, reducing on-site splicing and saving working hours.

4. Selection of pipe type based on functional requirements

  • Square tubes: Suitable for uniform loads, commonly used for columns, beams, and frames.
  • Rectangular tubes: Suitable for bending loads, ideal for beams, trusses, and lateral supports.
  • High-strength requirements: Thick-walled square and rectangular tubes can be selected to ensure structural safety.

5. Selection Based on Economic Considerations

  • Reasonable Wall Thickness: Choose the minimum wall thickness that meets the load-bearing requirements to avoid waste.
  • Bulk Purchasing: Standardize purchases based on commonly used specifications to reduce costs.
  • Processing Efficiency: Hot-formed products such as EN 10210 S355 Square & Rectangular Hollow Sections offer high dimensional accuracy and low residual stress, reducing on-site adjustments and significantly improving construction efficiency.

6. Suggested Selection Process

  • Determine the structural type and load-bearing requirements.
  • Calculate the side length and wall thickness of the square/rectangular tube based on the load.
  • Select the surface treatment method, considering environmental factors.
  • Determine the length and required dimensions.
  • Confirm feasibility based on construction and processing methods.
  • Finally, verify the standard specifications and tolerances provided by the supplier.

Related Products

EN 10210 S355 Square Tube Specifications Table

Side Length (mm) Wall Thickness Range (mm) Theoretical Weight Range (kg/m) Length (m)
30 × 30 3–5 3.42 – 5.70 6 / 12
40 × 40 3–6 4.54 – 8.12 6 / 12
50 × 50 3–6 5.62 – 10.00 6 / 12
60 × 60 4–8 8.96 – 17.20 6 / 12
80 × 80 4–10 11.92 – 28.60 6 / 12
100 × 100 4–12 14.80 – 39.00 6 / 12
120 × 120 4–12 17.70 – 46.50 6 / 12
150 × 150 5–12 27.20 – 74.00 6 / 12
200 × 200 6–16 42.50 – 121.00 6 / 12
250 × 250 6–16 53.00 – 151.00 6 / 12
300 × 300 6–16 63.00 – 180.00 6 / 12
350 × 350 8–16 92.00 – 230.00 6 / 12
400 × 400 8–16 110.00 – 285.00 6 / 12
450 × 450 10–16 135.00 – 340.00 6 / 12
500 × 500 10–16 171.00 – 395.00 6 / 12

 

EN 10210 S355 Rectangular Tube Specifications Table

Width × Height (mm) Wall Thickness Range (mm) Theoretical Weight Range (kg/m) Length (m)
40 × 20 3–6 3.70 – 6.00 6 / 12
50 × 30 3–6 5.20 – 9.50 6 / 12
60 × 40 4–8 7.15 – 15.30 6 / 12
80 × 40 4–10 10.45 – 22.90 6 / 12
100 × 50 4–12 14.80 – 36.00 6 / 12
120 × 60 4–12 18.00 – 45.00 6 / 12
150 × 75 5–12 27.20 – 72.00 6 / 12
200 × 100 6–16 42.50 – 120.00 6 / 12
250 × 150 6–16 63.00 – 180.00 6 / 12
300 × 200 6–16 82.00 – 240.00 6 / 12
400 × 200 8–16 110.00 – 285.00 6 / 12
500 × 300 10–16 171.00 – 395.00 6 / 12

Description

Wall thickness range: Lists the common wall thickness ranges for each size; custom sizes are available upon request.
Theoretical weight: Approximate weight calculated for different wall thicknesses, in kg/m.
Length: Standard lengths are 6 m or 12 m; custom lengths are available.
Steel grade: S355, high-strength non-alloy structural steel.
Standard: EN 10210 Hot-formed structural steel tubes.
Applications: Building structures, bridges, machinery supports, industrial plants, steel structural frames.

 

EN 10210 S355 Square & Rectangular Hollow Sections Standard Overview Table

Category Description
Standard Name EN 10210 – Hot finished structural hollow sections of non-alloy and fine grain steels
Steel Grade S355 (High-strength non-alloy structural steel)
Application Range Hot-formed square, rectangular, and circular hollow sections for load-bearing structures
Manufacturing Process Hot Finished
Section Shape Square / Rectangular / Circular
Dimensions & Tolerances Outer diameter / side length ±2% or ±2 mm; wall thickness ±10% or ±1 mm; length ±10 mm
Mechanical Properties Yield Strength ReH ≥ 355 MPa; Tensile Strength Rm 470–630 MPa; Elongation A ≥ 20%; Impact Toughness KV ≥ 27 J (at room temperature)
Chemical Composition Strict control of C, Mn, S, P, and other elements to ensure weldability and ductility
Surface Condition Bright hot-rolled, can be coated with anti-rust oil, or galvanized/painted
Inspection & Testing Visual inspection, dimensional measurement, tensile test, impact test; non-destructive testing (UT, radiography) if necessary
Application Fields Building structures, bridges, industrial workshops, machinery supports, high-rise steel structures
Standard Features High strength, high dimensional accuracy, low internal stress, good weldability and machinability
Comparative Standards EN 10219 – Cold-formed welded non-alloy square/rectangular/circular hollow sections; ASTM A500 – US standard square/rectangular hollow sections

 

EN 10210 S355 Square & Rectangular Hollow Sections manufacturing process

Step Process Description Key Features / Control Requirements
Raw Material Preparation Select high-quality S355 steel plates or strips Chemical composition complies with EN 10210 standard; strict control of C, Mn, S, P
Heating Heat steel plates/strips to 1150–1250 °C Uniform heating; avoid overheating or local cooling to ensure ductility and formability
Forming Hot-rolled or extruded through molds into square or rectangular tubes Accurate section dimensions, uniform wall thickness, low internal stress
Welding (for welded tubes) Longitudinal welding of open edges Uniform weld seam meeting mechanical property requirements; ensures structural strength
Cooling / Annealing Natural or controlled cooling of tubes Relieves internal stress; improves mechanical properties and toughness
Cutting to Length Cut to customer-specified or standard lengths Length tolerance ±10 mm; convenient for installation
Straightening / Flattening Straighten tube ends and remove bends Ensures tube straightness and cross-section accuracy
Surface Treatment Apply anti-rust oil, or hot-dip galvanize / paint Corrosion protection for indoor/outdoor applications
Inspection & Testing Dimensional measurement, tensile test, impact test Ensures mechanical properties, dimensional tolerances, and surface quality comply with EN 10210

Manufacturing Process Characteristics:
1. Hot forming process: Compared to cold-bent pipes, hot-formed pipes have lower internal stress and are less prone to deformation.
2. High-precision dimensions: Section dimensions, wall thickness, and length tolerances are strictly controlled.
3. Excellent mechanical properties: Yield strength ReH ≥ 355 MPa, tensile strength 470–630 MPa.
4. Flexible processing: Easy cutting, welding, and bending, resulting in efficient construction.
5. Corrosion resistance: Can be coated with anti-rust oil or galvanized, suitable for outdoor use.

 

EN 10210 S355 Square & Rectangular Hollow Sections testing standards

Inspection Category Test Item Reference Value / Standard Requirement Description
Visual Inspection Surface Defects No cracks, porosity, looseness, or burrs Ensures weldability and ease of installation
Outer Diameter / Side Length Dimensional Deviation ±2% or ±2 mm (whichever is greater) Ensures cross-section dimensions meet the standard
Wall Thickness Dimensional Deviation ±10% or ±1 mm (whichever is greater) Ensures pipe strength meets design requirements
Length Dimensional Deviation ±10 mm Meets construction and assembly requirements
Yield Strength ReH Tensile Test ≥ 355 MPa Ensures load-bearing capacity
Tensile Strength Rm Tensile Test 470–630 MPa Ensures safety under ultimate load
Elongation A Tensile Test ≥ 20% Ensures good ductility
Impact Toughness KV Charpy Impact Test ≥ 27 J (at room temperature) Ensures impact resistance
Chemical Composition Carbon C ≤ 0.22% Ensures weldability and ductility
Manganese Mn 1.50–1.70% Improves strength and toughness
Sulfur S ≤ 0.035% Controls brittleness
Phosphorus P ≤ 0.035% Controls brittleness
Non-Destructive Testing (NDT) Ultrasonic Testing (UT) / Radiographic Testing (RT) No cracks, porosity, or inclusions Checks internal quality of pipes and welds
Bending Performance Bending Test Pipe bends 90° without cracking Ensures manufacturability and construction feasibility
Surface Treatment Anti-Rust Oil / Galvanizing / Painting Anti-rust oil applied evenly; galvanizing thickness ≥ 50 μm Ensures corrosion protection

 

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EN 10210 S355 Square & Rectangular Hollow Sections – Frequently Asked Questions

Q1: What types of engineering projects are EN 10210 s355 square & rectangular hollow sections suitable for?

A: EN 10210 s355 square & rectangular hollow sections suitable for building structures, bridges, industrial plants, machinery supports, and high-rise steel structures.

Q2: How to choose between square and rectangular tubes?

A: Square tubes are suitable for columns or frames carrying uniform loads; rectangular tubes are suitable for beams or trusses subjected to bending or eccentric loads.

Q3: How to determine the side length and wall thickness of EN 10210 S355 Square & Rectangular Hollow Sections?

A: Choose based on structural load and design requirements:
Light load: 30×30–60×60 mm, wall thickness 3–5 mm
Medium load: 80×80–150×150 mm, wall thickness 5–10 mm
Heavy load: 200×200–500×500 mm, wall thickness 10–16 mm or more.

Q4: What are the mechanical properties of S355 steel?

A: Yield strength ≥ 355 MPa, tensile strength 470–630 MPa, elongation ≥ 20%, impact toughness ≥ 27 J (at room temperature).

Q5: Can square and rectangular tubes be welded?

A: Yes, hot-formed tubes have good weldability and support TIG, MIG, or manual welding.

Q6: Can square and rectangular tubes be bent?

A: Yes, square and rectangular tubes can be bent when proper forming methods are used.
Hot-formed products, such as EN 10210 S355 Square & Rectangular Hollow Sections, have low internal stress due to the hot-forming process.
This characteristic makes a Square and Rectangular Carbon Steel Tube less prone to cracking or deformation during bending.
As a result, they are well suited for bending, on-site processing, and structural construction applications.