P460NL1
1.8915High-strength weldable fine-grained alloy steel for pressure vessels with minimum yield strength 460 MPa. NL1 designation indicates impact testing at -40°C in the transverse direction. Normalized condition. Used for boilers, pressure vessels, heat exchangers, storage tanks, and pipes transporting hot liquids in the petrochemical, oil and gas, and power generation industries.
Chemical composition comparison (wt%)
Side-by-side: P460NL1 (EN) (EN 10028-3:2009) vs ASTM
| Element | P460NL1 (EN) | ASTM | Overlap |
|---|---|---|---|
| C | ≤ 0.2% | — | — |
| Si | ≤ 0.6% | — | — |
| Mn | 1.1–1.7% | — | — |
| P | ≤ 0.025% | — | — |
| S | ≤ 0.015% | — | — |
| Cr | ≤ 0.3% | — | — |
| Mo | ≤ 0.1% | — | — |
| Ni | ≤ 0.8% | — | — |
| V | ≤ 0.2% | — | — |
| Nb | ≤ 0.05% | — | — |
Mechanical properties
Normalized
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 570–720 | MPa |
| Yield Strength | ≥ 460 | MPa |
| Elongation | ≥ 17 | % |
| impact_kv | ≥ 40 | J |
| Density | ≥ 7.85 | g/cm3 |
| Elastic Modulus | ≥ 210 | GPa |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| normalizing | 900–940 °C | air | — | Delivered in normalized condition |
Related materials
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1.8933Ultra-high-strength quenched and tempered fine-grained structural steel with minimum yield strength 960 MPa. QL designation indicates impact testing at -40°C. Used for mobile cranes, heavy lift equipment, offshore wind turbine towers, mining machinery, and weight-critical structural applications. Weldable with appropriate precautions (preheating, low hydrogen). Dramatically reduces component weight compared to conventional structural steels.
P355NH
1.0565Weldable fine-grained non-alloy steel for pressure vessels with minimum yield strength 355 MPa. NH designation indicates normalized condition with specified elevated temperature properties and impact testing at -20°C. Very widely used pressure vessel grade for boilers, storage tanks, heat exchangers, and pipes transporting hot liquids and pressurized gases. Good weldability and resistance to brittle cracking.
C45E
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