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Brief Introduction

JIS G3466 STEEL PIPES
STANDEARD: JIS G3466
GRADE: STKR 400, STKR490
Outside Diameter:
20MM × 20MM - 1200MM × 1200MM(SHS)
20MM × 30MM - 1200MM × 1500MM(RHS)
Wall Thickness:
1.3MM - 50MM(SHS)
1.2MM - 50MM(RHS)
LENGTH: 1M - 25M,commonly used 5.8M, 6M, 12M.
Surface Treatment: Galvanizing, Painting, Coating

Chemical Composition

Grade
Chemical Composition
C
max.
Si
max.
Mn
max.
P
max.
S
max.
STKR 400
0.25
-
-
0.04
0.04
STKR 490
0.18
0.55
1.50
0.04
0.04

Physical requirements
Grade
Mechanical Properties
Tensile strength
Mpa
Yield strength MPa
Elongation
%
min
STKR 400
400
245
23
STKR 490
490
325
23

Application

The main application areas
JIS G3466 standard steel pipe because of its good mechanical properties (strength, toughness) and easy processing, widely used in the following fields:
1. Architecture and Civil Engineering
• Building frame: used for beams, columns, trusses and other load-bearing components of steel structure buildings.
• Curtain wall support: skeleton structure used as glass curtain wall or metal curtain wall.
• Bridge auxiliary structure: such as bridge floor support, temporary construction supports, etc.

2. Mechanical manufacturing
• Equipment frame: support frame for industrial machinery, automated production lines, machine tools.
• Conveying system: conveyor bracket, logistics storage shelf structure.

3. Infrastructure and public facilities
Fences/guardrail: protective structures for highways, airports, stadiums.
• Light pole/signal pole: the base material for street lights and traffic signal lamp support poles.

4. New energy and special uses
• Solar support: the support structure of the photovoltaic power generation system (with anti-corrosion treatment).
• Temporary facilities: exhibition stands, construction scaffolding (subject to additional safety standards).

Processing

Typical processing
JIS G3466 steel pipe manufacturing needs to follow a standardized process, the core steps include:
1. Prepare raw materials
• Steel coil selection: Carbon steel coil conforming to JIS G3131 (hot rolled low carbon steel sheet) or similar standards.
• Uncoiling and leveling: the steel coil is unrolled and the internal stress is eliminated by the leveler to ensure the flat sheet.

2. Molding process
• Cold forming: The steel plate is gradually bent into a square or rectangular tube blank through a continuous roller press unit.
• High frequency welding (HFW) : high frequency current is used to heat the edge of the tube blank, and pressure welding is formed to form a closed section (welding seams must meet the requirements of JIS standards).

3. Finishing and post-treatment
• Sizing and straightening: Adjust the dimensional accuracy of the pipe through the mold to eliminate bending deformation.
• Cutting: Flying saw or laser cutting according to customer's required length.
• Surface treatment:
◦ Pickling/sandblasting: removal of oxide and welding residue.
◦ Galvanizing/coating: Improved corrosion resistance (optional process, subject to JIS H8641 and other standards).

4. Quality inspection
• Mechanical properties test: sampling test tensile strength (≥270 MPa), yield strength, elongation, etc.
Weld inspection: Eddy current inspection (ECT) or ultrasonic inspection (UT) to ensure that the weld is free of defects.
• Dimensional tolerance verification: Check whether the section size, wall thickness and straightness meet the requirements of JIS G3466.

Processing Precautions

1. Welding process control: To avoid material embrittlement caused by overheating, matching welding materials and parameters should be used.
2. Cold forming accuracy: the wear of the forming roll needs to be calibrated regularly to prevent cross-section deformation.
3. Anti-corrosion requirements: If used in outdoor or high humidity environment, it is necessary to increase the thickness of the galvanized layer or coat the anti-corrosion coating.

Comparison with other standards

Comparison with other standards
• Difference from JIS G3444 (round tube) : JIS G3466 is designed for square/rectangular tubes, with more emphasis on section stiffness and connection convenience.
International standards: Similar standards include EN 10219 (Cold formed welded structural pipe in Europe) and ASTM A500 (carbon steel pipe for structural use in the United States).