Material Specifications & International Equivalents

As a key member of the STKM series mechanical structural tubes under JIS G3445 standard, STKM13A corresponds to various international material standards including:

  • China: 20# steel (GB/T 699)

  • United States: 1020 steel (ASTM standards)

  • Germany: C20 (DIN standards)

The optimized chemical composition with manganese content of 0.30%-0.60% ensures reliable transition characteristics between low and medium carbon steels, providing consistent performance across diverse manufacturing processes and application environments.

Mechanical Properties & Performance Characteristics

These balanced-performance seamless tubes demonstrate superior mechanical capabilities in annealed condition with tensile strength ≥390MPa, yield strength ≥245MPa, and elongation ≥22%. The enhanced strength properties represent approximately 15% improvement over STKM11A while maintaining excellent plastic deformation capacity for various forming operations.

The superior processing characteristics include excellent weldability with only simple preheating requirements, good machinability, and reliable cold forming capabilities for bending and flaring operations. This balanced combination of strength and processability makes STKM13A an ideal choice for applications requiring optimized performance balance between mechanical properties and manufacturing efficiency.

Applications & Industrial Solutions

STKM13A seamless tubes serve diverse applications across multiple sectors:

Mechanical Structures

  • Light load-bearing supports and connecting rods

  • Equipment transmission shafts for non-heavy-duty applications

  • Structural components requiring strength and formability

Fluid Transportation Systems

  • Medium-low pressure oil pipes and water conduits

  • Compressed air pipelines and industrial fluid transfer

  • Hydraulic system components

Automotive Components

  • Chassis lightweight structural members

  • Brake system low-pressure pipelines

  • Automotive structural applications demanding reliability

Hardware & Household Appliances

  • Appliance load-bearing frameworks

  • Hardware tool structural components

  • Consumer and industrial products requiring durability

Customization & Delivery Options

STKM13A tubes are typically supplied in annealed condition (GBK) to ensure optimal processability while being ready for immediate use in most medium-low load applications. For customers requiring enhanced strength properties, we also provide normalized condition (NBK) to meet specific performance requirements. Tenjan's manufacturing flexibility enables customized mechanical properties tailored to your specific application scenarios and operational needs.

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 STKM13A tubular solutions through advanced production capabilities 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 application requirements. With established logistics arrangements and responsive customer service, we ensure seamless supply chain integration and ongoing technical support throughout your project lifecycle.