CCS Grade DQ56 Shipbuilding Steel Plate Chemical Composition and Mechanical Property
| C max | Si max | Mn | P max | S max | N max. |
|
0.20 |
0.55 | 1.70 |
0.025 |
0.025 |
0.020 |
| Yield Strength (MPa) min. | Tensile Strength (MPa) | Elongation min. % |
| 550 | 670-830 | 16 |
CCS Grade DQ56 Shipbuilding Steel Plate Application
CCS Grade DQ56 Shipbuilding steel plate is mainly used to Shipbuilding Project and Ocean Offshore Structural Project.
CCS Grade DQ56 Shipbuilding Steel Plate Other Name
CCS Grade DQ56 Shipbuilding steel plate,CCS Grade DQ56 Ship Steel plate ,CCS Grade DQ56 Marine Steel plate , CCS Grade DQ56 Steel Plate .
FAQ
1. What makes CCS DQ56 superior to DQ51 in ultra-high-strength marine applications?
Answer:
CCS DQ56 represents China's cutting-edge marine steel technology with:
Higher yield strength (≥550 MPa) vs. DQ51's 500 MPa
Maintained -60°C impact toughness (≥47J Charpy V-notch)
Optimized Q&T microstructure for strength-toughness balance
Thinner structural designs possible for ice-class vessels
2. Which extreme marine applications require DQ56 steel?
Answer: Mission-critical uses:
Polar icebreaker hulls (PC1-PC3 ice classes)
LNG carrier membrane tank supports
Arctic offshore platform legs
Deep-sea ROV structural frames
Naval submarine pressure hulls
3. What advanced welding technologies are mandated for DQ56?
Answer: Cutting-edge protocols:
Narrow-gap SAW with 1.2mm flux-cored wires
Laser-hybrid welding (heat input <0.5 kJ/mm)
Real-time thermal monitoring with IR cameras
Mandatory PWHT at 600-630°C for thickness >25mm
100% automated UT scanning for all welds
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