JIS G3103 P235GH/P296GH/P355GH Pressure Vessel Steel: ASME-Compliant High-Temperature Solution for Petrochemical Reactors
Material Overview & Key Advantages
JIS G3103 specifies carbon-molybdenum alloy steel plates for 450°C high-temperature boilers and hydrogenation reactors, offering tensile strengths from 410 MPa (SB410) to 620 MPa (SB480M). These normalized plates meet ASME SA-515 requirements for refinery heat exchangers and power plant steam drums.
Competitive Edge:
- High-Temp Stability: 0.2% creep strength of 120 MPa @ 400°C (SB480M).
- Global Equivalency: EN 10028-2 P355GH (SB480), ASTM A537 Class 1 (SB480M).
- Cost Efficiency: 15% lower lifecycle cost vs. 316L stainless steel.
Technical Specifications
1. Chemical Composition (JIS G 3103:2023 Standard)
| Grade | C Max | Mn Range | Mo Range | CEV* | Thickness Limit |
|---|---|---|---|---|---|
| SB410 | 0.30% | ≤0.90% | – | 0.38 | ≤150mm |
| SB450M | 0.25% | ≤0.98% | 0.45–0.60% | 0.52 | ≤200mm |
| SB480M | 0.27% | ≤0.98% | 0.45–0.60% | 0.61 | ≤250mm |
| *CEV = C + Mn/6 + (Cr + Mo + V)/5 |
2. Mechanical Performance
| Grade | Tensile (MPa) | Yield (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| SB410 | 410–550 | 225 | 21 | 120–170 |
| SB450M | 450–590 | 255 | 19 | 150–200 |
| SB480M | 480–620 | 275 | 17 | 180–220 |
Physical Properties:
- Thermal Conductivity: 46.2 W/m·K (20–400°C)
- Linear Expansion: 13.1 µm/m°C (25–300°C)
Manufacturing & Processing
1. Heat Treatment
- Normalizing: 890–920°C × 1h/25mm (mandatory for SB480 series).
- Stress Relieving: 580–620°C × 2hrs (ASME VIII Div.2).
2. Surface Finishing
| Process | Technical Standard | Industry Use Case |
|---|---|---|
| Shot Peening | SAE J443 (0.2–0.4mm) | Steam Turbine Casings |
| Electroless Ni Plating | ISO 4527 (50–80µm) | Acid Condensers |
Industrial Applications
1. Petrochemical Plants
- Hydrogen Reactors: SB480M with 3.0mm corrosion allowance.
- Crude Oil Heaters: SB450M (PWHT + 100% UT inspection).
2. Power Generation
| Component | Material Grade | Operational Parameters |
|---|---|---|
| Steam Drums | SB450 | 350°C @ 17MPa |
| Deaerators | SB410 | 150°C @ 1.2MPa |
3. Industrial Boilers
- Water Tube Assemblies: SB480 (ASME Sect.I compliant).
- Superheater Headers: SB480M (NACE MR0103 certified).
Quality Compliance
- Testing Requirements:
- Ultrasonic testing: JIS G0581 Class 2 for thickness >75mm.
- Charpy impact test: 35J @ -20°C (SB480M).
- Certifications:
- JIS Mark + PED 2014/68/EU Annex II.
- TUV NORD AD2000-W0 Approval.
Delivery & Storage
- Dimensions:
- Width: 1,200–3,200mm (max length: 15m).
- Thickness tolerance: ±0.25mm (milled edges), ±0.8% (as-rolled).
- Packaging: VCI paper interleaved (18-month shelf life).
Welding Guidance: Use JIS Z3211 SF490A electrodes with 100–120°C preheat for SB480M*
Technical Footnotes:
- SB480M achieves 0.2% proof strength of 315 MPa @ 300°C.
- Maximum allowable stress: 145 MPa @ 150°C (ASME II-D Table 3).
Why Choose JIS G3103?
Compared to ASTM A516 Gr.70, JIS SB480M provides 18% higher yield strength at 200°C while maintaining equivalent weldability. Its molybdenum content (0.45–0.60%) enhances resistance to hydrogen-induced cracking in sour service environments.
Environmental Note: 92% recycled scrap content in production (JISQ 0030 compliant).
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