November 28, 2023
The yield strength (not less than 235 N/mm^2) and tensile strength (400 to 520 N/mm^2) of the four steels are the same. However, the impact energy at different temperatures is different;
High-strength hull structural steels are categorized according to their minimum yield strength, with each strength class being divided into A, D, E and F4 based on their impact toughness.
A32, D32, e32 and F32 have a yield strength of not less than 315N/mm^2 and a tensile strength of 440 to 570N/mm^2. A, D, E and F indicate that they can be used at 0° and -20°, respectively.
A36, D36, E36, and F36 have a yield strength of not less than 355 N/mm^2 and a tensile strength of 490 to 620 N/mm^2. A, D, E, and F indicate that they are acceptable for use at 0° and -20°, respectively. Impact toughness achieved at -40°, -60°;
A40, D40, E40, and F40 have a yield strength of not less than 390N/mm^2 and a tensile strength of 510 to 660N/mm^2. A, D, E, and F indicate that they can be used at 0° and -20°. A, D, E, and F indicate impact toughness achievable at 0° and -20°, and -40° and -60°, respectively.
ABS Shipbuilding Steel Grade A B D E Chemical Composition:
| ABS | |||||
|---|---|---|---|---|---|
| Grade | T: 8-600MM | ABS A | ABS B | ABS D | ABS E |
| Chemical Composition % ≤ | C | 0.21 | 0.21 | 0.21 | 0.18 |
| Mn(≥) | 2.5*C | 0.80 | 0.60 | 0.70 | |
| P | 0.035 | 0.035 | 0.035 | 0.035 | |
| S | 0.035 | 0.035 | 0.035 | 0.035 | |
| Si | 0.50 | 0.35 | 0.10-0.35 | 0.10-0.35 |
|
ABS Shipbuilding Steel Grade A B D E Mechanical Property:
| ABS | |||||
|---|---|---|---|---|---|
| Grade | T: 8-600MM | ABS A | ABS B | ABS D | ABS E |
| Mechanical Property ≥ | Yield Strength(Mpa) | 235 | 235 | 235 | 235 |
| Tensile Strength(Mpa) | 400-520 | 400-520 | 400-520 | 400-520 | |
| Impacting Test temperature(℃) | 20 | 0 | -20 | -40 | |
| Mark | AB/A | AB/B | AB/D | AB/E | |
