Material Specifications & International Standards

As a fundamental structural carbon steel grade within the European EN system, S235JR seamless tubes maintain precise correspondence with international standards including:

  • China: Q235B (GB/T 700)

  • Germany: St37-2 (DIN standards)

  • United States: A36 (ASTM standards)

  • Japan: SS400 (JIS standards)

The designation "S" indicates structural steel, "235" represents minimum yield strength of 235MPa, "J" specifies room temperature impact testing at 20°C, and "R" guarantees impact energy ≥27J, ensuring reliable quality consistency and performance stability.

Mechanical Properties & Performance Characteristics

These general-purpose structural tubes demonstrate reliable mechanical capabilities with yield strength ≥235MPa, tensile strength of 360-510MPa, and elongation ≥25% in annealed condition. The balanced mechanical properties provide adequate impact resistance and plastic deformation capacity for various structural applications and manufacturing processes.

The excellent processing characteristics include superior weldability without preheating requirements, strong cold forming capacity for bending, flanging, and stamping operations, and good machinability suitable for both small-scale workshops and large-scale production facilities. While offering lower strength compared to medium-carbon steels, these tubes provide cost-effective solutions for applications not requiring extreme mechanical performance or special environmental resistance.

Applications & Industrial Solutions

S235JR seamless tubes serve extensive applications across multiple industrial sectors:

Construction & Infrastructure

  • Structural steel supports and scaffolding systems

  • Bridge auxiliary components and pipeline supports

  • Factory load-bearing frameworks and building structures

Mechanical Manufacturing

  • Light equipment frames and non-heavy-duty connecting rods

  • Gear blanks and fastener components (bolts, nuts)

  • Equipment housings and machinery applications

Fluid Transportation Systems

  • Medium-low pressure water and air pipelines

  • Standard oil passage tubes and non-corrosive medium transfer

  • Municipal water supply/drainage systems and industrial fluid handling

Automotive & Agricultural Machinery

  • Chassis auxiliary structural members and agricultural machinery frames

  • Vehicle body frameworks and low-pressure oil pipes

  • Transportation equipment components requiring reliability

General Hardware Applications

  • Tool housings and furniture structural parts

  • Simple mechanical components and import equipment localization

  • Hardware and consumer product applications

Customization & Delivery Options

S235JR tubes are typically supplied in annealed condition (GBK/+A) to ensure optimal processability for welding and cold forming operations. Alternative delivery conditions include hot-rolled condition (AR) for general applications and normalized condition (NBK/+N) for enhanced microstructural homogeneity in critical structural applications. Precision engineering scenarios can be served with stress-relieved condition (BKS/+SR) to maintain long-term dimensional accuracy. Tenjan's manufacturing flexibility enables customized solutions in dimensions, surface quality, and mechanical properties to meet specific structural and fluid transportation requirements.

Tenjan Advantage & Quality Commitment

Supported by 21 years of specialized experience in structural steel tube manufacturing and comprehensive production capabilities, Tenjan delivers reliable S235JR tubular solutions through advanced quality management systems and technical expertise. Our full-process manufacturing control ensures consistent material quality and performance reliability, while flexible order quantities and professional technical support provide customized solutions for your specific structural application requirements. With established supply chain partnerships and responsive customer service, we ensure seamless project integration and ongoing technical support throughout your operation lifecycle, maintaining our commitment to delivering cost-effective structural solutions that meet international standards and exceed customer expectations for reliability and value in general structural applications.