Description
JIS G3462
JIS G3462 is a Japanese Industrial Standard that specifies the requirements for alloy steel tubes used in boilers, heat exchangers, and other high-temperature pressure applications.
Overview of JIS G3462
| Standard | JIS G3462 |
|---|---|
| Material | Alloy Steel |
| Type | Seamless Tubes |
| Application | Boilers, Heat Exchangers, High-temperature Pressure Service |
Common Grade
| Grade | Description |
|---|---|
| STBA23 | Cr-Mo alloy steel suitable for high-temperature, high-pressure environments |
STBA23 Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.15 |
| Silicon (Si) | 0.10 – 0.50 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 0.90 – 1.20 |
| Molybdenum (Mo) | 0.15 – 0.30 |
STBA23 Mechanical Properties
| Property | Requirement |
|---|---|
| Tensile Strength | ≥ 440 MPa |
| Yield Strength | ≥ 235 MPa |
| Elongation | ≥ 30% (for test piece of 25 mm gauge length) |
| Hardness (optional check) | HB ≤ 156 (approx.) |
Key Features
- Enhanced strength at elevated temperatures
- Excellent oxidation and corrosion resistance
- Superior thermal stability
- Seamless construction for high integrity
Applications
- Power plant boilers
- Petrochemical heat exchangers
- Superheater tubes
- High-pressure steam piping
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