JIS G3475 STKN400 Carbon Steel Seamless Tubes Thick Wall Pipe For Building Struture
JIS G3475 STKN400 STKN490 Carbon Steel Seamless Tubes: Thick Wall Steel Pipe for Building Structure
Material
JIS G3475 specifies the requirements for carbon steel seamless tubes used in various structural applications. The STKN400 and STKN490 grades are particularly designed for precision applications, providing excellent mechanical properties and weldability.
Specification
The seamless tubes under JIS G3475 are characterized by their high strength and durability, making them suitable for construction and structural applications. The specifications include dimensions, tolerances, and testing methods to ensure quality and performance.
Key Features
- High Strength: Designed to withstand heavy loads and stresses.
- Seamless Construction: Provides uniformity and reduces the risk of failure.
- Weldability: Suitable for various welding processes.
- Corrosion Resistance: Enhanced resistance to environmental factors.
Chemical Composition
| Element | STKN400 (%) | STKN490 (%) |
|---|---|---|
| Carbon (C) | 0.20 max | 0.25 max |
| Manganese (Mn) | 0.30 - 0.60 | 0.30 - 0.60 |
| Phosphorus (P) | 0.030 max | 0.030 max |
| Sulfur (S) | 0.030 max | 0.030 max |
| Silicon (Si) | 0.10 - 0.40 | 0.10 - 0.40 |
| Chromium (Cr) | 0.25 max | 0.25 max |
| Nickel (Ni) | 0.25 max | 0.25 max |
Mechanical Properties
| Property | STKN400 | STKN490 |
|---|---|---|
| Yield Strength (MPa) | 400 min | 490 min |
| Tensile Strength (MPa) | 490 - 610 | 590 - 720 |
| Elongation (%) | 20 min | 18 min |
| Hardness (HB) | 160 max | 180 max |
Steel Grade
- STKN400: Suitable for applications requiring moderate strength and good weldability.
- STKN490: Designed for applications that demand higher strength and durability.
Application
The STKN400 and STKN490 seamless tubes are widely used in:
- Construction of buildings and structures
- Manufacturing of machinery and equipment
- Automotive and transportation industries
- Oil and gas pipelines
Possible Alternative Grades
- JIS G3445: Similar applications with different mechanical properties.
- ASTM A53: Commonly used for structural steel pipes in various industries.
- EN 10210: European standard for hot-finished structural hollow sections.
These alternative grades may offer similar properties but should be evaluated based on specific application requirements.
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