5083-H321
Marine plate with a strength window: proof 215–295 MPa, tensile 305–385 MPa from 3 to 50 mm.
H116 and H321 are the tempers made for hulls: the mill proves, by ASTM G66 (exfoliation) and G67 (intergranular, ≤ 15 mg/cm²) tests and a reference micrograph, that the plate will not exfoliate in seawater (UR W25 §8.5). Ordinary H22/H32 or H24/H34 plate of the same strength has no such proof. Eurocode 9 Table 3.2a has no row for either temper, so there are no fo/fu or HAZ values from it here; after welding the zone next to the weld falls back towards the O/H111 strength. H321 differs from H116 by its upper limits on proof and tensile strength and its higher A50 elongation (12 %).
- 0.2 % proof strength Rp0.2
- 215–295MPaFrom the standard3–50 mm
- Tensile strength Rm
- 305–385MPaFrom the standard3–50 mm
- Elongation after fracture A
- ≥ 10%From the standard12.5–50 mm · A5d
All values
- Identity and composition not yet
- Mechanical 6
- Design values not yet
- Physical not yet
- Thermal not yet
- Fire not yet
- Chemical and durability not yet
Mechanical
Strength
0.2 % proof strength Rp0.2
Minimum 0.2 % proof strength guaranteed by the product standard.
| Condition | Value | Evidence |
|---|---|---|
| 215–295MPa | From the standard1 | |
| ≥ 200MPa | Trade sources only |
Tensile strength Rm
Ultimate tensile strength. Product standards give a range or a minimum.
| Condition | Value | Evidence |
|---|---|---|
| 305–385MPa | From the standard | |
| ≥ 285MPa | Trade sources only |
Ductility
Elongation after fracture A
Minimum elongation; depends on gauge length and test direction.
| Condition | Value | Evidence |
|---|---|---|
| ≥ 12% | From the standard1 | |
| ≥ 10% | From the standard |
Sources here are public pages that reproduce IACS UR W25. For design and acceptance, the standard edition named in your specification and the inspection certificate (EN 10204 3.1) of the delivered product take precedence. Design factors are recommended values; your National Annex may set others.