P275NL1
1.0488Weldable fine-grained non-alloy steel for pressure vessels with minimum yield strength 275 MPa and impact testing at -40°C (NL1 designation). Low-temperature variant of P275NH. Used for low-temperature pressure vessels, cryogenic storage tanks, and process equipment where guaranteed sub-zero toughness is required. Good weldability without preheating for most thicknesses.
Chemical composition comparison (wt%)
Side-by-side: P275NL1 (EN) (EN 10028-3:2009) vs ASTM
| Element | P275NL1 (EN) | ASTM | Overlap |
|---|---|---|---|
| C | ≤ 0.16% | — | — |
| Si | ≤ 0.4% | — | — |
| Mn | 0.8–1.5% | — | — |
| P | ≤ 0.025% | — | — |
| S | ≤ 0.015% | — | — |
| Cr | ≤ 0.3% | — | — |
| Mo | ≤ 0.08% | — | — |
| Ni | ≤ 0.5% | — | — |
| V | ≤ 0.05% | — | — |
| Nb | ≤ 0.05% | — | — |
Mechanical properties
Normalized
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 370–510 | MPa |
| Yield Strength | ≥ 275 | MPa |
| Elongation | ≥ 24 | % |
| 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
S960QL
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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