Steel Grade Selection (IACS UR W11)
Minimum steel grade by plate thickness and structural category (primary / secondary / tertiary) per IACS UR W11.
Minimum grade
E
Formula, assumptions, and limits
A / B / D / E distinguish by notch-toughness temperature. AH / DH / EH are higher-tensile equivalents (N/mm² yield 315+). Plate thickness determines brittle-fracture risk at low T.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Charpy test temperatures | - | IACS UR W11 |