EN 10028 16Mo3 Steel Plate: High-Temperature Molybdenum Alloy for Boiler & Pressure Vessel Construction
EN 10028-2 16Mo3 (1.5415) is a molybdenum-enriched carbon steel plate engineered for boilers and pressure vessels operating at 450-550°C (842-1,022°F). Certified to EN 10207:2017 and PED 2014/68/EU, this normalized steel delivers 440-590 MPa tensile strength with 27J guaranteed impact toughness at -20°C. Available in thicknesses 6-250mm (±1.3% tolerance), widths up to 4,000mm, and lengths ≤14m, it offers 35% higher creep resistance than ASTM A204 Gr.B at 500°C.
Technical Specifications & Global Equivalents
Chemical Composition:
| Element | C | Mn | Mo | Si | P | S |
|---|---|---|---|---|---|---|
| Range | 0.12-0.20 | 0.40-0.90 | 0.25-0.35 | 0.35 max | ≤0.025 | ≤0.01 |
Key Global Equivalents:
- DIN 17155: 15Mo3
- ASTM: A204 Gr.B
- NFA 36-205: 15D3
- JIS G3115: SBV1A
Mechanical Properties:
| Thickness (mm) | Tensile (MPa) | Yield (MPa) | Elongation (%) | Hardness (HBW) |
|---|---|---|---|---|
| ≤16 | 440-590 | ≥220 | ≥24 | 130-180 |
| 17-40 | 440-590 | ≥220 | ≥22 | 135-185 |
| 41-250 | 440-590 | ≥220 | ≥19 | 140-190 |
Physical Properties:
| Parameter | Value | Application Impact |
|---|---|---|
| Thermal Conductivity | 45 W/m·K | Resists thermal fatigue in superheaters |
| Coefficient of Expansion | 12.3×10⁻⁶/°C (20-500°C) | Matches SA387 Gr.12 in power plants |
| Modulus of Elasticity | 210 GPa | 15% higher rigidity vs. SA516-70 |
Performance Advantages
- High-Temperature Stability: Maintains 85% yield strength at 500°C vs. 60% for SA516-70
- Weld Efficiency: Preheat ≤120°C with EN 756:2012 W Mo 1 filler metal
- Corrosion Resistance: 0.02 mm/year oxidation rate in steam environments (EN 10246-2)
- Cost Savings: 22% lower lifecycle cost than SA387 Gr.11 clad plates
Industrial Applications
16Mo3 plates are specified for critical components including:
- Power Generation: Steam drum shells (180mm) handling 15 MPa at 540°C
- Petrochemical: Catalytic cracker reactors (200mm) with 50,000-hour creep life
- HVAC: High-pressure heat exchangers (50mm) resisting thermal cycling
- Shipbuilding: Marine boiler systems (80mm) in corrosive saltwater environments
Project Case: A 2023 retrofit of Taiwan’s Taichung Power Plant used 850+ tons of 16Mo3 for 550°C superheater headers, achieving 0.009% deformation after 10,000 operating hours.
Fabrication Guidelines
Heat Treatment:
- Normalizing: 890-950°C (1,634-1,742°F) + air cooling (EN 10028-2)
- Stress Relieving: 580-650°C (1,076-1,202°F) for 2 mins/mm thickness
Welding Parameters:
- GTAW with SG-Mo1 electrodes (EN ISO 14343)
- Interpass Temp: ≤250°C
- Heat Input: 1.2-2.5 kJ/mm
Machining Recommendations:
- Speed: 70-100 SFM (turning) / 180-220 SFM (milling)
- Tooling: AlTiN-coated carbide for hardened surfaces
Quality Assurance & Testing
- Full ultrasonic testing per EN 10160 Class S2E4
- Charpy V-notch tests at -20°C (EN 10045-1)
- EN 10204 3.1 certification with full traceability
Custom Services: Flame cutting (≤300mm), edge milling, and shot blasting to SA 2.5.
Packaging: VCI-coated + waterproof wrapping; 24-ton 40HQ container capacity.
Certifications: TÜV, Lloyd’s Register, and Bureau Veritas approved.
Packing And Delivery
