API 2H Grade 50 is a normalized carbon-manganese structural steel grade specified under API Spec 2H for welded offshore structures. With a minimum yield strength of approximately 50 ksi [345 MPa], it provides a strong combination of mechanical strength, toughness, and weldability for critical structural components.
The grade is commonly used in offshore platforms, marine structures, tubular joints, stiffened plates, and other load-bearing offshore components. Its controlled chemistry and impact toughness make it suitable for severe marine environments and applications where reliable performance under dynamic and low-temperature conditions is required.
Final chemical, mechanical properties, dimensions and tolerances are confirmed against the governing specification and purchase order.
| Element | C | Mn | P | S | Si | Nb (Cb) | Ti | Al | N |
|---|---|---|---|---|---|---|---|---|---|
| Min | - | 0.90 | - | - | 0.05 | - | - | 0.02 | - |
| Max | 0.18 | 1.35 | 0.03 | 0.01 | 0.40 | 0.04 | 0.02 | 0.06 | 0.012 |
| Property | Tensile Strength | Yield Strength | Elongation |
|---|---|---|---|
| Min | 70 ksi [485 MPa] | 50 ksi [345 MPa] | 18% |
| Max | 90 ksi [620 MPa] | - | - |
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