JIS G3443-1 STW290 Seamless Steel Tube Coated Steel Pipes For Water Service
JIS G3443-1 STW290 STW370 STW400 Seamless Steel Tube Coated Steel Pipes For Water Service
Material
The JIS G3443-1 standard specifies the requirements for seamless steel tubes used in water service applications. The primary materials used in the production of these tubes are carbon steel grades, which are designed to provide excellent corrosion resistance and mechanical properties.
Specification
The seamless steel tubes covered under JIS G3443-1 are categorized into different grades based on their mechanical properties and chemical composition. The standard outlines the dimensions, tolerances, and testing methods to ensure the quality and performance of the tubes.
Key Features
- Seamless Construction: Provides enhanced strength and durability.
- Corrosion Resistance: Coated to prevent rust and degradation.
- High Pressure Tolerance: Suitable for various water service applications.
- Versatile Applications: Can be used in different environments and conditions.
Chemical Composition
| Grade | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) |
|---|---|---|---|---|---|
| STW290 | 0.18 max | 0.60 - 0.90 | 0.030 max | 0.030 max | 0.10 - 0.40 |
| STW370 | 0.20 max | 0.60 - 0.90 | 0.030 max | 0.030 max | 0.10 - 0.40 |
| STW400 | 0.25 max | 0.60 - 0.90 | 0.030 max | 0.030 max | 0.10 - 0.40 |
Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|
| STW290 | 290 | 410 - 540 | 20 |
| STW370 | 370 | 490 - 620 | 20 |
| STW400 | 400 | 510 - 640 | 20 |
Steel Grade
The steel grades specified in JIS G3443-1 include STW290, STW370, and STW400. Each grade is designed to meet specific mechanical and chemical property requirements, making them suitable for various applications in water service.
Application
These seamless steel tubes are primarily used in:
- Water supply systems
- Irrigation systems
- Industrial water pipelines
- Construction projects requiring water service lines
Possible Alternative Grades
While STW290, STW370, and STW400 are the primary grades specified in JIS G3443-1, alternative grades that may be considered for similar applications include:
- ASTM A53
- ASTM A106
- EN 10216-1
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