Let’s compare the steel grades in the shipbuilding industry AH36, DH36 and EH36 through their physical and chemical properties. AH36, DH36 and EH36 are three important steel grades widely used in the shipbuilding industry. However, they have differences to suit different usage requirements in marine structures.
1. Comparison of Mechanical Properties of AH36, DH36, EH36 Steel
AH36, DH36, and EH36 are all high-strength steels that meet BV (Bureau Veritas) maritime classification standards. The primary differences lie in impact resistance and metallurgical temperature:
| Steel Grade | Tensile Strength (MPa) | CVN Impact Energy (J) | CVN Temperature (°C) | Common Applications |
|---|---|---|---|---|
| AH36 | 490 – 620 | ≥ 27 | Room temperature (~20°C) | Multipurpose ships (cargo, bulk carriers, container ships) in temperate climates. |
| DH36 | 490 – 620 | ≥ 27 | -20°C or lower | Ships operating in cold regions with moderate climates. |
| EH36 | 510 – 690 | ≥ 27 | -40°C or lower | Large oil tankers, offshore platforms in high-latitude regions. |
2. Comparison of Chemical Properties of AH36, DH36, EH36 Steel
AH36, DH36, and EH36 have similar chemical compositions, but EH36 contains higher carbon and alloying elements, enhancing corrosion resistance and strength:
| Element | C (%) | Mn (%) | Si (%) | Ni (%) | Cr (%) | CEV (%) |
|---|---|---|---|---|---|---|
| AH36 | ≤ 0.18 | 0.90 – 1.60 | 0.15 – 0.35 | ≤ 0.40 | ≤ 0.15 | ≤ 0.40 |
| DH36 | ≤ 0.18 | 1.00 – 1.70 | 0.15 – 0.40 | 0.40 – 0.50 | ≤ 0.20 | ≤ 0.40 |
| EH36 | ≤ 0.20 | 1.00 – 1.70 | 0.15 – 0.50 | 0.40 – 0.50 | 0.15 – 0.25 | ≤ 0.40 |
3. Processing Methods for AH36, DH36, EH36 Steel
These steel types are rolled and processed to meet the highest standards:
3.1. AH36 and DH36 Steel:
✅ Air Cooling (AC)
For standard shipbuilding applications, these steels are usually rolled and air-cooled after processing. They do not undergo additional heat treatment unless specifically required for certain applications.
3.2. EH36 Steel:
✅ Air Cooling (AC) or Quenching & Tempering (QT)
EH36 steel is often processed in a QT condition for offshore platforms and heavy-duty ships. The quenching process improves both strength and toughness, making the steel more resistant to cracking or failure under stress.
4. Conclusion
Choosing between AH36, DH36, and EH36 depends on the intended application.
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AH36 is suitable for deck structures.
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DH36 is used for hulls and ship sides.
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EH36 is ideal for harsh marine environments.
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