Material Specifications & International Equivalents 

As a fundamental low-alloy high-strength steel grade within the EN 10025 standard system, E355 seamless tubes maintain precise correspondence with international standards including:

  • China: Q355B low-alloy high-strength structural steel (GB/T 1591)

  • United States: A572 Gr.50 (ASTM standards)

  • Japan: SM490YA (JIS standards)

  • Germany: S355JR (DIN standards)

The designation "E" represents engineering steel, while "355" indicates minimum yield strength of 355MPa, clearly defining its low-alloy high-strength characteristics for cost-effective structural applications requiring enhanced performance over carbon steels.

Mechanical Properties & Performance Characteristics

These high-strength low-alloy tubes demonstrate excellent mechanical capabilities with yield strength ≥355MPa, tensile strength of 470-630MPa, and elongation ≥21% in annealed condition. The enhanced impact toughness ≥27J at 20°C provides reliable performance in various structural applications, representing over 40% strength improvement compared to conventional carbon steels while maintaining good plasticity and fracture resistance.

The superior processing characteristics include excellent weldability without complex preheating requirements, strong cold forming capacity for bending, flanging, and stamping operations, and good machinability with tool wear rates comparable to carbon steels. The optimized micro-alloy composition ensures better corrosion resistance through passive film formation and stable low-temperature performance, with derivatives like E355NL capable of withstanding -20°C impact conditions.

Technical Advantages: 

  • Optimal balance between high strength and cost-effectiveness

  • Enhanced corrosion resistance compared to carbon steels

  • Excellent weldability and cold forming capabilities

  • mproved fatigue resistance and deformation resistance

  • 30-40% cost reduction versus medium-carbon alloy steels

  • Reliable performance in structural applications

Applications & Industrial Solutions 

E355 low-alloy seamless tubes serve extensive applications across multiple industrial sectors:

Mechanical Manufacturing 

  • Equipment frames and non-heavy-duty transmission shafts

  • Gear blanks and pressure vessel shells

  • Engineering machinery chassis structural components

  • Machinery applications requiring strength and processability balance

Fluid Transportation Systems

  • Medium-high pressure water and air pipelines

  • Oil and natural gas transmission pipelines

  • General fluid transfer in chemical industry

  • Industrial piping for non-corrosive media

Automotive & Agricultural Machinery

  • Commercial vehicle frames and agricultural machinery chassis

  • Automotive bumper skeletons and trailer load-bearing structures

  • Transportation equipment requiring strength and weight reduction

General Structural Applications 

  • Hardware mechanical structural components

  • Imported equipment localization replacement

  • Large equipment auxiliary structural members

  • Structural applications replacing Q355B and S355JR material components

Customization & Delivery Options 

E355 tubes are typically supplied in annealed condition (GBK/+A) to optimize cold processing and welding performance. For precision structural components, we provide normalized condition (NBK/+N) to enhance microstructural homogeneity. Low-temperature applications can be served with thermomechanical controlled processing (TMCP) condition to improve impact toughness for environments below -20°C. Tenjan's manufacturing flexibility enables customized solutions in dimensions, surface quality, and mechanical properties to meet specific structural application requirements.

Tenjan Advantage & Quality Commitment 

Supported by 25 years of specialized experience in low-alloy steel tube manufacturing and comprehensive production capabilities, Tenjan delivers reliable E355 tubular solutions through advanced quality management systems and technical expertise. Our custom alloy steel capability enables production of various domestic and international steel grades tailored to your specific application requirements, including specialized low-alloy high-strength steels for cost-effective structural applications. With full-process manufacturing control and professional technical support, we ensure consistent material quality and performance reliability for your most demanding structural applications. Our flexible order quantities and responsive customer service guarantee seamless project integration and ongoing technical support throughout your operation lifecycle, maintaining our commitment to delivering high-performance low-alloy solutions that exceed customer expectations for strength, durability, and cost efficiency in general structural environments.