ST35 Tubes & Pipes

DIN 2391 ST35 Seamless Pipes & DIN 1.0308 Welded Tubes Supplier

ST35 (Werkstoff 1.0308) is a widely utilized German-standard low-carbon manganese steel, specified under DIN 2391 for precision seamless and welded tubes. Known for its exceptional balance of strength and ductility, ST35 typically contains approximately 0.17% carbon and 0.4% manganese. This chemical composition provides a minimum yield strength of 235 Mpa and tensile strength of between 360-480 Mpa. The material is also a good option in fluid systems, boilers, and general piping throughout the chemical, oil and gas and power industries because it has superior weldability, formability and machinability without the complex heat treatments required in other materials, due to its low carbon content. 

As a leading supplier, we supply DIN 2391 ST35 pipes and tubes in different conditions such as NBK (normalized), BK, BKS, GBK and cold-finished so as to maintain high dimensional accuracy and consistent performance. We have round, square, rectangular, honed, and hydraulic shapes, all made under tight control of quality. These precision tubes may be surface-hardened through carburizing or nitriding to provide greater wear resistance, providing a general purpose mechanical and hydraulic engineering solution. Each product is customizable in size, finish, and length to meet the rigorous technical requirements of your specific project. 

For pricing and availability, you can contact our sales team .

ST35 DIN 2391 Seamless Pipe Types

All ST35 DIN 2391 seamless pipes can be supplied in custom sizes, wall thicknesses, surface finishes, and delivery conditions to meet mechanical, hydraulic, and structural application needs.

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DIN 2391 ST35 Pipe Specifications

ST35 Carbon Steel Pipe Chemical Composition

ST35 Steel Pipes Mechanical Properties

Manufacturing & Supply Conditions of St35 Steel

• BK – Cold drawn, high dimensional accuracy
• BKS – Cold drawn & stress relieved
• NBK – Normalized for improved toughness
• GBK – Annealed with excellent formability
• Cold Finished / Honed Tubes – Precision hydraulic applications

All ST35 pipes can be supplied with plain, beveled, or threaded ends, and optional surface finishes such as oiled, polished, or pickled. 

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ST35 Steel Dimensional Tolerances

Wall Thickness Tolerance: ±10%

ST35 Steel Tubes & Pipes Applications

Thanks to its affordability, strength, and excellent cold-forming properties, ST35 steel pipes are widely used in:

• Hydraulic & pneumatic systems
• Boiler and heat exchanger tubing
• Automotive & mechanical engineering
• Oil, gas, water & fluid pipelines
• Precision structural and machinery components

Surface hardening methods such as carburizing or nitriding can be applied where increased wear resistance is required without sacrificing cost efficiency. 

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