| Customization: | Available |
|---|---|
| Application: | Chemical Industry, Construction Industry, Oil and Gas Industry |
| Carbon Content: | High Carbon Steel |
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JIS G3454 Welded Steel Pipe
| Category | Details |
|---|---|
| Standard | JIS G3454 (Japanese Industrial Standard) |
| Material Type | Carbon Steel / Carbon-Molybdenum Steel (Grades: STPG370, STPG410, STPG480, STMGT370, STMGT410) |
| Manufacturing | Welded (ERW/SAW), post-weld heat-treated (normalized or stress-relieved) |
| Key Features | - High-temperature resistance (up to 350°C) - Moderate pressure capability - Cost-effective ERW/SAW production - Good weldability and ductility |
| Applications | - Steam pipelines (power plants) - Boiler systems - Chemical process piping - Structural supports in high-temperature environments |
| Advantages | - Economical for medium-pressure systems - Enhanced creep resistance (Mo-added grades) - Compatible with thermal cycling - Compliant with regional Asian standards |
| Limitations | - Limited to moderate pressure (<30 MPa) - Requires coatings for corrosion protection - Less precise tolerances vs. precision tubing standards |
| Dimensional Range | - OD: 21.7-508 mm - Wall Thickness: 2.0-16 mm - Length: 5-12 m (customizable) |
| Surface Finish | Mill finish (bare) or coated (galvanized/painted) |
| Int'l Equivalents | - KS D3507 (Korea) - GB/T 8163 (China) - ASTM A53 (partial overlap in applications) |
1. Overview
JIS G3454 is a Japanese Industrial Standard for carbon and carbon-molybdenum steel welded pipes designed for high-temperature and high-pressure service. These pipes are widely used in industrial piping systems, boilers, heat exchangers, and structural applications. The standard emphasizes durability, weldability, and performance under thermal stress, making it a key choice for energy, construction, and manufacturing sectors in Japan and internationally.
2. Key Features
Material Grades:
STPG370, STPG410, STPG480: Carbon steel grades with varying tensile strength (e.g., STPG410: min. tensile strength 410 MPa).
Optional STMGT370, STMGT410: Molybdenum-added grades for enhanced high-temperature strength.
Manufacturing Process:
Electric Resistance Welding (ERW): Cost-effective for general-purpose applications.
Submerged Arc Welding (SAW): For thicker walls or large diameters requiring higher structural integrity.
Post-weld heat treatment (normalizing or stress relieving) to improve mechanical properties.
Dimensional Specifications:
Outer Diameter (OD): 21.7-508 mm (0.85-20 inches).
Wall Thickness: 2.0-16 mm (0.08-0.63 inches).
Length: Typically 5-12 meters (random or fixed lengths).
Mechanical Properties:
Yield Strength: 215-275 MPa (varies by grade).
Tensile Strength: 370-480 MPa (dependent on grade).
Elongation: 25-30% (ensures ductility for bending and forming).
Temperature Resistance:
Suitable for service temperatures up to 350°C (660°F) for carbon steel grades.
Molybdenum-added grades (STMGT) extend performance in high-temperature environments.
Surface Treatment:
Bare (mill finish) or coated (e.g., black paint, galvanizing) for corrosion protection.
3. Applications
Industrial Piping Systems:
Steam lines, hot water pipelines, and thermal oil systems in power plants.
Process piping in chemical and petrochemical plants.
Boiler and Heat Exchanger Tubes:
Used in low-to-medium pressure boilers and heat recovery systems.
Structural Use:
Supports, frames, and machinery parts requiring high strength-to-weight ratios.
Infrastructure:
Water supply, HVAC, and firefighting pipelines in commercial buildings.
4. Advantages Over Alternatives
Cost Efficiency: ERW production reduces costs compared to seamless pipes.
High-Temperature Performance: Molybdenum grades resist creep and oxidation.
Weldability: Compatible with standard welding techniques (e.g., TIG, MIG).
Compliance: Meets JIS, KS (Korean), and GB (Chinese) standards for regional projects.
5. Limitations
Pressure Limits: Not suitable for ultra-high-pressure systems (e.g., >30 MPa).
Corrosion Resistance: Requires coatings or galvanizing for corrosive environments (e.g., marine applications).
Dimensional Tolerances: Less precise than precision tubing standards (e.g., EN 10305).
6. Standards & Certifications
JIS G3454: Specifies chemical composition, mechanical properties, and testing methods.
Complementary Standards:
JIS G3452 (carbon steel pipes for ordinary piping).
JIS G3460 (large-diameter welded pipes for structural use).
Certifications: ISO 9001, PED (Pressure Equipment Directive) for European markets.
7. Market Positioning
JIS G3454 welded pipes are favored in industries prioritizing cost-effective, high-temperature piping solutions, including:
Energy: Thermal power plants and geothermal systems.
Construction: Industrial complexes and commercial HVAC systems.
Manufacturing: Automotive exhaust systems and machinery components.
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