EN 39 scaffolding steel pipe
EN 39 Steel tubes to european standard, which have a specified outside diameter of 48,3 mm and specified thickness of 3,2 mm or 4,0 mm, may also be used in conjunction with other sizes and grades of steel tubes for applications such as prefabricated scaffolds.
EN 39 standard specifies the requirements for non-alloy steel tubes for use with EN 74 couplers in the construction of falsework and working scaffolds.
See the table below for EN 39 scaffolding steel pipe production specifications.
Chemical composition and Mechanical Properties of eN 39 scaffolding pipe
The silicon content should be limited to a maximum of 0.04%
Chemical Composition and Mechanical Properties
| Steel grade | Chemical composition (cast analysis),in %, by mass | Mechanical properties | ||||||||
| C | Si | Mn | P | S | Al | Yield strength ReH min |
Tensile strength Rm |
Elongation A min |
||
| Steel name | Steel number | max. | max. | max. | max. | min. | MPa¹ | MPa¹ | % | |
| S235GT | 1.010 6 | 0,20 | a, b | 1,40 | 0,040 | 0,045 | 0,020 | 235 | 340/520 | 24 |
| a ≤0,05 % (range 1)(≤ 0,04 % if option 2 is specified) or≥ 0,15 % ≤ 0,2 5 % (range 2) b When bare tubes are specified (see option 8) the range shall be reported at the time of enguiry and order. |
||||||||||
Dimensions, mass and tolerances Of EN 39 Scaffolding Pipe
-
Dimensions Of En 39 Scaffolding Pipe
The specified outside diameter is 48,3 mm and the specified wall thickness is 3,2 mm for type 3 and 4,0 mm for type 4
Tolerances on dimensions
The tolerance on specified outside diameter is +/-0,5 mm.
The tolerance on out of roundness is included in the diameter tolerance.
The tolerance on wall thickness is -10 %. However, for seamless tubes, a deviation from specified wall thickness of more than 10 % but not more than 15 % of the specified thickness may occur in smooth transition areas over no more than 25 % of the circumference.
The inside diameter of tubes shall allow insertion of a gauge of diameter 37,7 mm for a minimum length of 200 mm.
|
|
|
|
-
Mass Of En 39 Scaffolding Pipe
The nominal mass per unit length of type 3 tube is 3,56 kg/m and for type 4 tube 4,37 kg/m.
Tolerance on mass
The mass deviation on a single tube shall not exceed -7,5 % of the specified mass.
-
Length Of En 39 Scaffolding tube
The types of length and tolerance are shown in the table below
| Types of length and tolerances on length | ||
| Type of length | Length L m |
Tolerance a mm |
| Standard | 6 or 6,4 | −50/+150 for welded ±500 for seamless |
| Approximate | 4 ≤ L ≤ 12 | |
| Exact | ≤ 6 6 < L ≤ 12 |
0 / +10 0 / +15 |
| a Option 4 a tighter tolerance on length as specified by the purchaser shall apply. | ||
Test methods Of EN 39 Scaffolding Pipe
-
Tensile test Of En 39 Scaffolding Pipe
The tensile strength (Rm)
The upper yield strength (ReH)
Elongation at Fracture (A)
S235GT: Yield strength ≥235 MPa, tensile strength 340–520 MPa, elongation ≥24% .
-
Flattening test Of En 39 Scaffolding Pipe
The test shall be carried out in accordance with EN 10233. The tube section shall be flattened with the weld, for successive tests, or, for tubes supplied with specific inspection, successive test units, placed alternately, at 0° or 90° to the direction of flattening.
When only one test unit is to be tested, the position of the weld is at the discretion of the manufacturer unless otherwise agreed.
The distance between the platens, measured under load, shall not be greater than 75 % of the original outside diameter of the tube and no cracks or flaws observed. The test shall be continued until the distance between the platens, measured under load, is not more than 60 % of the original outside diameter and no cracks or flaws observed in the metal elsewhere than in the weld.
-
Visual examination
The tubes shall have a smooth external surface corresponding to the manufacturing process.
-
Dimensional inspection
Specified dimensions of bare tubes, including straightness, shall be verified.
The outside diameter shall be measured with a gauge.
The inside diameter of tubes shall be checked by the insertion of a gauge of 37,7 mm diameter for a minimum length of 200 mm.
If you have any inquiries and questions, please contact Youfa Steel Pipe. at any time. Thanks in advance. Welcome!
Contact Youfa Steel Pipe to obtain a quotation for EN39 scaffold steel pipes
Key characteristics of eN 39 steel pipe
- Dimensional and Geometrical Characteristics
This is one of the most critical aspects, as it ensures compatibility with scaffolding couplers.
Nominal Outside Diameter (OD): 48.3 mm (This is equivalent to approximately 1.9 inches, making it very close to the common US 2-inch nominal pipe).
Wall Thickness: The standard specifies a minimum wall thickness of 4.0 mm. The tolerance is typically +0.0mm / -0.5mm, meaning the wall can be no thinner than 3.5mm. This is thicker than standard Schedule 40 pipe, providing superior strength.
Length: Tubes are supplied in specified lengths, commonly from 1m up to 6.5m or longer, with strict tolerances on straightness and squareness of the ends.
Dimensional Consistency: The OD and wall thickness must be consistent along the length of the tube. This is vital for wedge-type couplers to grip securely and safely without slipping.
- Material and Mechanical Properties
Ductility: The material must have a minimum elongation at fracture (a measure of ductility), ensuring it will deform somewhat before catastrophic failure, providing a visual safety warning.
- Manufacturing Process
Type: EN 39 pipes are seamless or welded cold-formed hollow sections. The welding process must be automated to ensure consistency and strength.
Workmanship: The tubes must be free from surface defects that would impair their strength or use, such as cracks, scabs, or deep grooves. The ends must be cleanly cut and deburred.
- Surface Protection (Corrosion Resistance)
Galvanization: The vast majority of EN 39 pipes are hot-dip galvanized. This process involves dipping the steel tube in a bath of molten zinc, creating a thick, bonded coating that provides excellent corrosion resistance for long-term outdoor use on construction sites.
Coating Mass: The standard may specify a minimum mass of zinc coating (e.g., ≥ 600 g/m²) to ensure a long service life. The galvanized coating should be continuous and adherent.
application of eN 39 steel pipe
- Tube and Fitting Scaffolding (The Most Common Use)
This is the traditional and most widespread application. EN39 tubes form the primary framework for scaffolding structures on building facades, construction sites, and industrial projects.
Standards (Vertical Members): Carry the entire load of the structure down to the base.
Ledgers (Horizontal Members): Connect the standards horizontally, providing lateral stability.
Transoms (Bracing Members): Positioned perpendicular to ledgers, they provide support for scaffold boards (the working platform) and add rigidity to the structure.
Bracing: Diagonal tubes used to provide crucial stability against swaying and wind loads.
- Scaffolding and Shoring
Scaffolding system is a temporary structure used to support permanent structures (like bridges, ceilings, arches) during their construction or repair until they can support themselves.
Support Systems: EN39 tubes are used to create strong, modular support towers and frameworks that hold up formwork (the molds for concrete).
Props and Acrow Props: While many props are proprietary systems, the basic principle is similar-using steel tubes to provide adjustable vertical support.
- Structural Frameworks and Temporary Installations
The versatility of the tube-and-coupler system allows EN39 pipes to be used for a wide range of temporary structural needs:
Event Structures: Stages, concert rigging, lighting towers, and exhibition stands.
Temporary Roofs and shelters: For construction sites or outdoor events.
Guardrails and Handrails: Temporary safety barriers on construction sites or in industrial facilities.