News aus der Stahlwelt: Entwicklungen und Innovationen bei UnionStahl
DBS 918 002-02: New delivery conditions for structural steel in railroad bridge construction from December 2025
From 01.12.2025, the new DBS 918 002-02 “Technical delivery conditions for structural steels for railroad bridge construction” of Deutsche Bahn will apply.
Post Weld Heat Treatment (PWHT)
Post Weld Heat Treatment (PWHT): Stress relief annealing after welding for safe, standard-compliant components.
Wear-resistant steels at a glance: Properties, areas of application and well-known brands
A comparison of wear-resistant steels: properties, applications and brands such as Creusabro®, Dillidur®, Durostat®, Brinar® – find out more now!
Tensile test in thickness direction – the Z-test simply explained
What is a tensile test in the thickness direction and when is a Z-test necessary? Find out how the Z-value increases the safety of steel structures and which standards apply.
Tensile test of steel – insight into the mechanical properties
The tensile test is a key test method for determining the mechanical properties of steel. Find out more about the procedure, important characteristic values such as yield strength and tensile strength as well as relevant standards for quality testing.
Delivery states of steel and their significance
Discover the different delivery states of steel such as +AR, +N, +QT and thermomechanical rolling. Learn how heat treatments optimize material properties. Learn more now!
Types of test certificates and their significance
Everything about test certificates such as works certificates, acceptance test certificates and specific tests in accordance with DIN EN 10204. Quality assurance in steel production – find out more now!
Weldability of steels: The importance of carbon equivalents
Learn about the importance of carbon equivalents (CE) in welding technology. Discover calculation methods such as CEV, CET and PCM and their application in practice to optimize the weldability of steels.
Guidelines for pressure vessel steel grades: What you need to know
Pressure vessel steel grades are special steel grades that are designed for the manufacture of containers that must withstand high pressure and temperature loads and must not show any cracks or other damage.
CTOD test: Crack resistance of steel in the endurance test
The CTOD test is an important test standard for steel. It simulates the formation of cracks and helps to determine the material’s crack resistance. Read here how the test works and what advantages it offers.
The DWT test: proof of fracture mechanics for materials
The DWT test, also known as the Pellini or drop weight test, determines the Nil Ductility Transition Temperature (NDT) and is used to assess the fracture resistance of ferritic steels.
Sour gas-resistant steel grades – how to defy the rust monster
For use in pipelines and pressure vessels that come into contact with sour gas, steel grades with high purity, homogeneous microstructure and low sulphur content are essential in order to prevent hydrogen-induced cracking (HIC).
The modulus of elasticity
Steel is an indispensable material in many industries. Its high strength and rigidity make it ideal for the construction of bridges, machines and systems. But how can you calculate how resilient steel is? This is where the modulus of elasticity comes into play.
Knocking on sheet metal – your guide to strip and heavy plate
The volume of orders in the steel industry is subject to numerous external influences that often call for complete solutions from a single source. Thanks to forward-looking planning and flexible options, UnionStahl is also ideally prepared to meet special requirements. Learn more
Endurance test for steel: the DWTT test
Resistance to dynamic stress is of crucial importance. The DWTT test focuses on this property and provides important findings.
