Alukönigstahl
Contact
AKS Login
Tubes

Seamless Tubes

Explore our range of seamless steel tubes available in various grades, dimensions, and specifications for a wide range of industrial applications.

Explore all products
Image Needed Placeholder

Features

Workability

Easy to process, can be welded without restrictions

Stability

High dimensional stability and homogeneous structure;

Concentricity

Highly concentric

Strength

Excellent static properties for steel construction applications.

Standards, Steel Grades and Dimensions

Certificates and Approvals

With certificate 3.1 according to EN 10204, upon request with certificate 3.2, EC mark

Material and delivery terms

Structural tubes for steel structures: EN 10210 S235JRH / S355J2H

Tubes for mechanical engineering: EN 10297-1 E235+AR / E355+AR / E355+N

Tubes for machining purposes: ISO 2938 / EN 10294-1 20MnV6 / E470

Line pipes: EN 10216-1 / EN 10216-3 P235TR1 / P235TR2 / P355N / P355NHTC1

Dimensions scope

Outside dimensions: 26.9 – 508 mm
Wall thickness: 2.6 – 16 mm.

Seamless Steel Tubes

Seamless steel tubes are steel products manufactured without a longitudinal weld seam. They are produced from a solid steel billet that is plastically worked into a tubular shape. Depending on the production process, the tubes may subsequently be rolled or cold-drawn to achieve the required dimensions and properties.

The absence of a weld seam makes seamless tubes suitable for many applications where specific mechanical properties, product uniformity, and operational reliability are important. Proper selection depends on the intended application, steel grade, standard requirements, and service conditions.

KÖNIGSTAHL offers seamless tubes for various applications, including structural and precision tubes. Solutions for specific piping applications are also available.

Steel sections in a warehouse

Types of Seamless Tubes

Depending on the application, the following categories can be distinguished:

Structural tubes

Designed for steel structures, machinery, and equipment.

Mechanical tubes

Used for manufacturing parts and components requiring specific material properties.

Precision tubes

Intended for applications requiring high dimensional accuracy and surface quality.

Line pipes

Selected for transporting specific media according to the applicable standard and project requirements.

Applications of Seamless Tubes

Seamless tubes are used in mechanical engineering, equipment manufacturing, steel construction, transportation engineering, and selected industrial installations. Depending on grade and specification, they may also be used in demanding mechanical and hydraulic systems.

Steel sections in a warehouse

How to Select a Seamless Tube?

When choosing a seamless tube, consider:

  • Dimensions

    Outside diameter and wall thickness

  • Standards

    Product standard and delivery condition

  • Certification

    Required inspection certificates and additional testing.

  • Steel Grade

    Steel grade and required mechanical properties

  • Service Conditions

    Service conditions, including temperature, pressure, and load type, where applicable

It is important to remember that the absence of a weld seam does not automatically mean that every seamless tube is suitable for pressure applications. Its suitability depends on compliance with the specific requirements of the intended application.

Quality and Documentation

For industrial applications, material traceability and quality documentation are essential. KÖNIGSTAHL provides EN 10204 Type 3.1 inspection certificates and, upon request, Type 3.2 inspection certificates, subject to the conditions specified for the relevant product group.

Not Sure Which Steel Fits Your Project?

Our steel specialists can help you navigate material options and identify the best solution for your performance, processing, and durability requirements.

Contact a specialist