Material Specifications & International Equivalents

As a fundamental carbon structural steel grade in the German DIN system, St37 series tubes correspond to various international standards including:

  • China: Q235B (GB/T 700, for St37-2/St37-3)

  • United States: A36 (ASTM standards)

  • Japan: SS400 (JIS standards)

  • Europe: S235JR (EN 10025, equivalent to St37-2)

The optimized chemical composition with manganese content of 0.30%-0.60% and controlled sulfur/phosphorus impurities (≤0.05%) ensures consistent performance across diverse structural applications and manufacturing processes.

Grade Variations & Key Differences

St37 (Basic Grade)

  • No mandatory impact toughness requirements

  • Specified tensile strength and yield strength only

St37-2 (Most Widely Used)

  • Required room temperature impact test (impact energy ≥27J)

  • Enhanced toughness guarantee

  • Equivalent to China's Q235B grade

St37-3U (Special Applications)

  • "U" indicates non-aging characteristics

  • Stricter impact test temperature requirements

  • Suitable for low-temperature or special environments

Other Variants

  • St37-3N (normalized delivery condition)

  • St37-4 and other specialized versions

Mechanical Properties & Performance Characteristics

These structural seamless tubes demonstrate reliable mechanical capabilities with yield strength ≥235MPa, tensile strength of 340-470MPa, and elongation ≥25% in annealed condition. 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 small and medium enterprises with basic processing equipment.

Applications & Industrial Solutions

St37 series tubes (particularly St37-2) serve as versatile solutions for "general structural loading + easy processing" applications across multiple sectors:

Construction & Infrastructure

  • Structural steel supports and scaffolding

  • Bridge auxiliary components and pipeline supports

  • Building structures and framework applications

Mechanical Manufacturing

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

  • Gear blanks and fasteners (bolts, nuts)

  • Machinery components requiring reliability

Fluid Transportation Systems

  • Medium-low pressure water and air pipes

  • Standard oil passage tubes and non-corrosive medium transfer in chemical industry

  • Industrial fluid handling applications

Automotive & Agricultural Machinery

  • Chassis auxiliary structural members

  • Agricultural machinery frames and vehicle body frameworks

  • Transportation equipment components

General Hardware

  • Tool housings and furniture structural parts

  • Simple mechanical components and hardware applications

  • Consumer and industrial products

Customization & Delivery Options

St37 series tubes are typically supplied in hot-rolled condition (AR) or annealed condition (GBK/+A), with annealed condition being more suitable for subsequent cold processing and welding operations. Special grades like St37-3N can be provided in normalized condition (NBK/+N) to ensure microstructural homogeneity. Tenjan's manufacturing capability includes precision St37-2 tubes according to DIN 2391 standard with outer diameter tolerance within ±0.05mm, meeting requirements for high-precision structural components.

Tenjan Advantage & Quality Commitment

Supported by 21 years of specialized experience in seamless tube manufacturing and 30 years of technical expertise in our R&D team, Tenjan delivers reliable St37 series tubular solutions through advanced production equipment and comprehensive quality management systems. 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 quality traceability systems and responsive customer service, we ensure reliable supply chain integration and ongoing technical support throughout your project lifecycle, maintaining our commitment to delivering cost-effective structural solutions without compromising quality standards.