Key characteristics of CCS DH36 steel:
High Strength:
DH36 has a minimum yield strength of 355 MPa and a tensile strength between 490-630 MPa.
Good Toughness:
DH36 plates are designed to maintain their structural integrity even in cold environments, with low-temperature impact tests often performed at -20°C, according to www.steel-plate-sheet.com.
Weldability:
DH36 is designed to be readily weldable using common shipbuilding welding techniques.
Classification Society Approval:
DH36 steel plates are certified by CCS, indicating they meet the society's standards for shipbuilding steel.
Typical applications:
Hull construction:
DH36 is commonly used in the construction of ship hulls, including floors, bulkheads, and decks.
FAQ
1. What is the key difference between CCS DH36 and AH36 steel plates?
Answer:
CCS DH36 provides enhanced low-temperature performance with:
Same yield strength (≥355 MPa) as AH36
Stricter impact toughness at -40°C (vs. AH36's -20°C)
Improved crack resistance for Arctic/ice-class vessels
Mandatory fine-grain practice through controlled rolling
2. What mechanical properties must DH36 plates meet per CCS certification?
Answer: Required properties:
| Property | Requirement | Test Standard |
|---|---|---|
| Yield Strength | ≥355 MPa | GB/T 228.1 |
| Tensile Strength | 490-630 MPa | GB/T 228.1 |
| Elongation (A50) | ≥21% | GB/T 228.1 |
| Charpy V-Notch | ≥34J @ -40°C | GB/T 229 |
| Bend Test | 180° (2t radius) | GB/T 232 |
(Standard values for thickness ≤50mm)
3. Where is CCS DH36 steel typically used in shipbuilding?
Answer: Common applications include:
Ice-class vessel hulls (PC4-PC6 categories)
LNG carrier secondary barriers
Offshore platform legs in cold regions
Winter navigation bulk carriers
Polar research vessel structural components
4. What special welding considerations apply to DH36?
Answer: Essential welding protocols:
Preheating: 150-200°C (thickness-dependent)
Filler Metals: GB/T 5117 E5515 (AWS E8015 equivalent)
Heat Input Control: ≤25 kJ/cm
Post-Weld NDT: 100% UT for thickness >25mm
PWHT Recommendation: 600-630°C for thickness >30mm
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