JIS G3444 STK400 Structural Steel Tube

Introduction

JIS G3444 STK400 structural steel tube is a widely used hollow section in construction and engineering. It provides excellent strength and flexibility. Thanks to its reliability, it has become a preferred material for structural frameworks, pipelines, and mechanical applications.

Standard Overview

The Japanese Industrial Standard (JIS) G3444 specifies carbon steel tubes used for general structural purposes. STK400 represents a grade with a minimum yield strength of 245 MPa. It balances toughness and formability, making it suitable for welding, cutting, and fabrication.

Mechanical Properties

The STK400 tube offers stable performance under stress. Its tensile strength typically ranges from 400 to 510 MPa. Elongation remains high, ensuring durability in dynamic environments. This combination of strength and ductility guarantees long-term service life.

Property STK400 Value
Yield Strength ≥ 245 MPa
Tensile Strength 400 – 510 MPa
Elongation ≥ 23%
Dimensions and Shapes

JIS G3444 STK400 tubes come in various diameters and thicknesses. They are available in round, square, and rectangular forms. Manufacturers supply them in plain ends, beveled ends, or threaded types depending on project needs.

Applications

The STK400 structural tube finds extensive use in multiple industries. It supports building structures, bridges, towers, and scaffolding. In addition, it serves in mechanical frames, agricultural equipment, and piping systems. Its adaptability makes it a versatile choice for engineers.

Advantages

STK400 tubes offer several key benefits. They provide consistent quality under JIS standards. Their weldability allows quick fabrication. Furthermore, they deliver excellent cost-performance balance compared to higher-grade steels. As a result, many industries continue to prefer STK400.

Conclusion

JIS G3444 STK400 structural steel tube combines strength, flexibility, and affordability. It meets diverse engineering needs while ensuring safety and reliability. For projects requiring dependable structural support, STK400 remains a smart and effective choice.