JIS G3444 STK400 STEEL PIPE

Commodity name： JIS G3444 STK400 STEEL PIPE

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ERW Pipe

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产品描述

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.

Core Advantage

Brisk Steel Group is rooted in a culture of "technology as the backbone, quality as the soul, and customers as the heart." Through relentless innovation, global expansion, and a commitment to responsibility, we strive to become a trusted global partner and a technological benchmark in the steel manufacturing industry.

Craftsmanship with Precision

We adhere to a rigorous quality control system that spans the entire production process—from raw material procurement and manufacturing to product delivery—ensuring the highest standards of excellence.

Innovation-Driven Technological Leadership

We prioritize R&D and technological advancement, integrating cutting-edge production lines (e.g., JCOE large-diameter LSAW pipe production) and expert teams from countries like Germany and the Netherlands to maintain our position at the forefront of the industry.

Globalization and Open Collaboration

Actively engaging in the global supply chain, we have obtained international certifications such as CE marking, enabling our products and services to reach worldwide markets.

Professional Team and Talent Empowerment

We value the recruitment and development of technical talent, building an international and professional team that drives continuous growth.

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