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Overview
JIS G3444 STK400 is a Japanese Industrial Standard (JIS) specification for carbon steel tubes used for general structural purposes.
- Standard: JIS G3444
- Title: Carbon steel tubes for general structural purposes
- Scope: This standard specifies requirements for carbon steel tubes used in mechanical structures, construction, and other general structural applications (e.g., bridges, buildings, vehicles). These tubes are typically welded or seamless and are not intended for high-pressure fluid conveyance.
- Grade Designation: STK400
"STK" stands for Structural Tube, Carbon.
"400" indicates the minimum tensile strength of 400 MPa (approximately 40 kgf/mm²).
Other Grade: STK290, STK490, STK500, STK540
- Outside Diameter:
1/2 INCH - 15INCH(CHS)
20MM × 20MM - 1200MM × 1200MM(SHS)
20MM × 30MM - 1200MM × 1500MM(RHS)
- Wall Thickness: 1.2MM - 60MM
- Length: Commonly used 5.8M, 6M, 12M, also depends on the requirements
- Advantades: High Strength, Durability, Easy to Fabricate
- Application: Transportation water,Construction industry,energy industry
Mechanical Properties and Chemical Composition
-
Key Mechanical Properties:
| Property | Requirement for STK400 |
|---|---|
| Tensile Strength | ≥400 MPa (min) |
| Yield Strength | ≥235 MPa (min) |
| Elongation | 23% (longitudinal direction), 18% (transverse direction) |
-
Chemical Composition (Typical, max %)
The chemical composition of STK400 steel is controlled to ensure the desired balance of strength and ductility. The maximum limits for key elements are:
Carbon (C): 0.25%
Silicon (Si): Not specified
Manganese (Mn): Not specified
Phosphorus (P): 0.040%
Sulfur (S): 0.040%
(Exact limits may vary; refer to the latest JIS G3444 revision.)
Manufacturing Process and Surface Treatment
Manufacturing Process
- Tubes are typically produced via electric resistance welding (ERW) or seamless (SMLS) methods.
- Surface finish may be bare, galvanized, or coated depending on application requirements.
Surface Treatment
The surface of JIS G3444 STK400 pipes can be treated with various coatings to enhance corrosion resistance and durability. Common treatments include painting, galvanizing, and other protective coatings.
Applications
JIS G3444 STK400 pipes are suitable for a wide range of applications due to their strength and versatility. They are commonly used in:
- Civil engineering projects
- Structural frameworks
- Steel towers and scaffolding
- Piles for landslide suppression
- General construction and architectural applications.
Overall, JIS G3444 STK400 is a reliable and widely-used material in the construction and engineering industries, offering a good balance of strength and ductility.
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