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Detailed Overview
JIS G3466 STKR400 is a commonly used steel grade specified in the Japanese Industrial Standards (JIS) for carbon steel pipes used in structural purposes. It is widely employed in various construction and mechanical applications due to its excellent balance of strength, weldability, and affordability.
Key Characteristics
Material: Carbon steel
Standard: JIS G3466 - Carbon steel pipes for ordinary structural purposes
Grade: STKR400
Minimum Yield Strength: 400 MPa (58,000 psi)
Tensile Strength: 400-510 MPa (58,000-74,000 psi)
Elongation: Minimum 17% (depending on pipe size and wall thickness)
Chemical Composition (typical):
Carbon (C): ≤ 0.30%
Manganese (Mn): ≤ 1.60%
Phosphorus (P): ≤ 0.040%
Sulfur (S): ≤ 0.040%
Advantages
High Strength: STKR400 offers a minimum yield strength of 400 MPa, making it suitable for load-bearing structures and components.
Good Weldability: The controlled carbon content and chemical composition ensure good weldability using common welding methods.
Cost-Effective: Compared to higher-grade steels, STKR400 provides a cost-effective solution for structural applications without compromising on essential strength requirements.
Wide Availability: Being a standard JIS grade, STKR400 pipes are readily available in various sizes and wall thicknesses.
Applications
STKR400 pipes find extensive use in a wide range of structural applications, including:
Building Construction:
Structural frames and columns
Roof trusses and purlins
Scaffolding and temporary structures
Bridge Construction:
Bridge girders and beams
Railings and guardrails
Industrial Structures:
Factory buildings and warehouses
Transmission towers and poles
Support structures for machinery and equipment
Other Applications:
Fencing and gates
Agricultural equipment
General-purpose structural components
Comparison With Other Grades
STKR400 is often compared to other structural steel grades like STK400 and SS400. While all three grades share similar minimum yield strengths, STKR400 offers slightly better weldability and formability due to its controlled chemical composition.
Conclusion
JIS G3466 STKR400 is a versatile and widely used carbon steel grade that provides an excellent combination of strength, weldability, and cost-effectiveness for various structural applications. Its availability, reliability, and compliance with JIS standards make it a preferred choice for engineers and contractors in Japan and other countries that adopt JIS standards.

JIS G3466 STKR400 TUBE

JIS G3466 STKR400 TUBE STANDEARD: JIS G3466 GRADE: STKR 400, STKR490 Outside Diameter: 20MM × 20MM - 1200MM × 1200MM(SHS) 30MM × 40MM - 500MM × 600MM(RHS) Wall Thickness: 1.3MM - 50MM(SHS) 2MM - 25MM(RHS) LENGTH:1M - 25M,commonly used 5.8M,6M,12M. Surface Treatment: Galvanizing, Painting. Application: Construction Structure, Containers, Offshore Oil Fields, Machinery Making, Sea Trestle

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