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Overview
JIS G 3466 is a Japanese Industrial Standard that specifies the requirements for carbon steel tubes used primarily in machine structural applications. The standard covers seamless and welded tubes intended for mechanical and structural components in machinery, automobiles, and general engineering.
● The STKR400 grade under this standard denotes a carbon steel tube with a minimum tensile strength of 400 MPa, making it suitable for medium-strength structural applications.
● JIS G3466 STKR400 Carbon Steel Tubes
Specification:
OD: 20MM × 20MM - 1200MM × 1200MM (SHS); 20MM × 30MM - 1200MM × 1500MM (RHS)
WT: 1.3MM - 50MM
Length: Commonly used 5.8M,6M,12M,or as your requirement
Surface Treatments: Coating, Hot-dip galvanized, Painting
Application: General machinery parts, Automotive components, Construction equipment, Industrial machinery

Chemical Composition And Mechanical Properties
Chemical Composition (STKR400)
The chemical composition of STKR400 must comply with the following requirements (typical values):
Element
Composition (%) (Max)
Carbon (C) ≤ 0.25
Silicon (Si) -
Manganese (Mn) -
Phosphorus (P) ≤ 0.040
Sulfur (S) ≤ 0.040
(Note: Exact limits may vary slightly depending on manufacturing processes.)

Mechanical Properties (STKR400)
Property
Requirement
Tensile Strength (MPa) ≥ 400
Yield Strength (MPa) ≥ 245
Elongation (%) ≥ 23 (based on specimen dimensions)
These properties ensure good formability, weldability, and structural integrity for mechanical applications.


Manufacturing Process
Seamless Tubes: Produced by hot-rolling or cold-drawing without welding.
Welded Tubes: Made by electric resistance welding (ERW) or other welding methods, followed by heat treatment if required.

Applications And Advantages
Applications
STKR400 tubes are commonly used in:
● Automotive parts (chassis, frames)
● Construction machinery (booms, arms)
● General mechanical structures (supports, brackets)
● Industrial equipment (conveyors, hydraulic systems)

Advantages
● High Strength: Capable of withstanding high loads and providing structural stability.
● Excellent Weldability: The low carbon content ensures good weldability, making it easy to join with other steel components.
● Cost-Effective: Offers a balance of strength and cost, making it suitable for a wide range of applications.


Comparison With Other Grades
Grade
Tensile Strength (MPa)
Yield Strength (MPa)
Key Features
STKR400 ≥ 400 ≥ 245 Balanced strength & formability
STKR490 ≥ 490 ≥ 325 Higher strength, less ductile

Testing & Inspection
Tubes must undergo:
● Tensile testing
● Flattening test / Flaring test (for ductility)
● Hydrostatic or non-destructive testing (NDT) for leaks/defects

Conclusion
JIS G 3466 STKR400 is a medium-strength carbon steel tube suitable for structural and mechanical applications requiring good weldability and formability. It is widely used in Japan and internationally for automotive and industrial components.

Element	Composition (%) (Max)
Carbon (C)	≤ 0.25
Silicon (Si)	-
Manganese (Mn)	-
Phosphorus (P)	≤ 0.040
Sulfur (S)	≤ 0.040

Property	Requirement
Tensile Strength (MPa)	≥ 400
Yield Strength (MPa)	≥ 245
Elongation (%)	≥ 23 (based on specimen dimensions)

Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Key Features
STKR400	≥ 400	≥ 245	Balanced strength & formability
STKR490	≥ 490	≥ 325	Higher strength, less ductile

JIS G3466 STKR400 Carbon Steel Tubes

JIS G3466 STKR400 Carbon Steel Tubes Grade: STKR400 Standard: JIS G3466 Specification: OD: 20MM × 20MM - 1200MM × 1200MM WT: 1.3MM - 50MM Length: Commonly used 5.8M、6M、12M,or as your requirement Surface Treatments: Powder coating, Hot-dip galvanized, Primer painted Application: General machinery parts, Automotive components, Construction equipment, Industrial machinery

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