AH36 vs DH36 vs EH36 vs FH36 Shipbuilding Steel Plate Comparison
AH36, DH36, EH36 and FH36 are high strength shipbuilding steel plates widely used for ship hulls and offshore structures. All four grades share the same minimum yield strength of 355 MPa, but differ significantly in low temperature impact toughness. This page provides a clear comparison to help engineers and buyers select the correct steel grade.
Overview of AH / DH / EH / FH Series
The letters A, D, E and F represent different impact test temperatures. As the letter level increases, the steel plate offers better resistance to brittle fracture in colder environments.
AH36 vs DH36 vs EH36 vs FH36 – Key Comparison Table
| Steel Grade | Minimum Yield Strength | Impact Test Temperature | Low Temperature Performance | Typical Application |
|---|---|---|---|---|
| AH36 | 355 MPa | 0°C | Standard | General ship hull structures |
| DH36 | 355 MPa | -20°C | Improved | Cold region ships and marine structures |
| EH36 | 355 MPa | -40°C | Excellent | Low temperature offshore platforms |
| FH36 | 355 MPa | -60°C | Ultra low temperature | Arctic and polar marine environments |
How to Choose the Right Shipbuilding Steel Grade
When selecting shipbuilding steel plates, the most important factor is the minimum design temperature of the vessel or structure. Choosing a steel grade with insufficient low temperature toughness may significantly increase the risk of brittle fracture.
- AH36 is suitable for normal temperature marine environments.
- DH36 is recommended for moderate cold regions.
- EH36 is widely used in low temperature offshore engineering.
- FH36 is designed for extreme cold, Arctic and ice-class vessels.
Classification Society Approval
All AH36, DH36, EH36 and FH36 steel plates can be supplied with approval from major classification societies, including: ABS, DNV, LR, BV, CCS, NK and KR.
Related Shipbuilding Steel Products
- AH36 Shipbuilding Steel Plate
- DH36 Shipbuilding Steel Plate
- EH36 Shipbuilding Steel Plate
- FH36 Shipbuilding Steel Plate
FAQ – Shipbuilding Steel Grade Comparison
1. What is the main difference between AH36 and DH36?
The main difference is the impact test temperature. AH36 is tested at 0°C, while DH36 is tested at -20°C.
2. Can EH36 replace DH36 or AH36?
Yes. EH36 provides better low temperature toughness and can replace DH36 or AH36 when required by design conditions.
3. Why is FH36 used in Arctic vessels?
FH36 offers ultra low temperature impact toughness tested at -60°C, making it suitable for extreme cold environments.
4. Do all grades have the same strength?
Yes. AH36, DH36, EH36 and FH36 all have a minimum yield strength of 355 MPa.