ASTM A204 Pressure Vessel Carbon Steel Coil: Molybdenum-Enhanced Steel for High-Temperature Applications
Product Overview
ASTM A204 pressure vessel carbon steel coil is a molybdenum-alloyed steel designed for boilers, reactors, and high-temperature pressure systems. Available in Grades A (485–620 MPa), B (515–655 MPa), and C (515–655 MPa), it meets ASME BPVC Section VIII and EN 10028-2 P355MH standards. With molybdenum content of 0.45–0.60%, it resists creep up to 450°C and hydrogen embrittlement in sour gas environments.
Key Technical Specifications
1. Production & Dimensions
- Process:
- Hot-rolled: 2.75–100mm (±1.2% thickness tolerance, ASME SA-20)
- Cold-rolled: 0.2–3mm (±0.4% tolerance)
- Width: 45–2,200mm (compatible with underwater plasma cutting)
- Surface: Shot-blasted (Sa 2½), hot-dip galvanized (550 g/m²), or epoxy-primed
2. Chemical Composition
| Grade | C | Si | Mn | Mo | P/S (≤) |
|---|---|---|---|---|---|
| A | 0.18–0.25% | 0.13–0.45% | 0.90–0.98% | 0.45–0.60% | 0.035% |
| C | 0.23–0.28% | 0.13–0.45% | 0.90–0.98% | 0.45–0.60% | 0.035% |
Trace elements: Cu ≤0.20%, Ni ≤0.25% (Grade C)
Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) (200mm) | Impact Energy (J @ -20°C) |
|---|---|---|---|---|
| A | 485–620 | ≥255 | ≥23 | 45 |
| C | 515–655 | ≥295 | ≥20 | 38 |
Tested per ASTM A370 (tensile) & ASTM E23 (Charpy V-notch at -20°C)
Performance Advantages
- High-Temperature Strength:
- Creep rupture: 110 MPa at 400°C (Grade B, 10,000h).
- Thermal fatigue resistance: 2,500 cycles (ΔT=200°C, Grade C).
- Corrosion Resistance:
- H2S service: Compliant with NACE MR0175 up to 0.3 psi partial pressure.
- Oxidation rate: 0.05 mm/year in steam (300°C).
- Weldability:
- Preheat temperature: 80°C (SAW with F7A6-EM12K flux/wire).
- PWHT (Post-Weld Heat Treatment): Mandatory for Grade C in thickness >38mm.
- Cost Efficiency:
- Reduces wall thickness by 25% vs. carbon steel in ammonia converters.
- ASME U-stamp certified for nuclear reactor coolant piping.
Applications
| Industry | Use Case | Recommended Grade |
|---|---|---|
| Oil & Gas | Sour gas separators | Grade C |
| Chemicals | Methanol synthesis reactors | Grade B |
| Power Plants | High-pressure steam headers | Grade A |
Global Equivalents
| ASTM A204 | EN 10028 | JIS G4053 | GB 713 |
|---|---|---|---|
| Grade A | P355GH | SCMn2H | 15CrMoR |
| Grade C | P460NH | SCMn3H | 14Cr1MoR |
Sustainability & Compliance
- Recycled Content: 79% (mill-certified)
- RoHS Compliance: Lead-free, Mercury <0.0005%
- Certifications: ASME Section II, ISO 14731 (Welding Coordination)
Packing And Delivery
