DNV A shipbuilding steel plate and sheet
The steel for shipbuilding and oil platform---A, is the common tensile strength steel.
DNV A is the Hull structural steel,with it's good toughness properties, higher strength,strong corrosion-resistance ,the processing properties,and welding properties.
DNV A Steel Application :
DNV A steel can be used in the manufacture of the ship's hull structure whose weight is below 10000 tons,and usually do navigation around coastal and river area. DNV A with high strength, good toughness low temperature impact , excellent weldability characteristics, is a kind of high strength ship's hull structure plate.DNV A is used to manufacture medium-sized ocean, coastal and river trade area ship's hull structure.
DNV A Steel chemical composition by [%]:
| Grade |
C max |
Si max |
Mn |
P max |
S max |
|
DNV A |
0.21 |
0.50 |
≥ 2.5C |
0.035 |
0.035 |
Note: 1.CE: C+1/6Mn ≤ 0.40%,Cu ≤ 0.35%,Ni ≤ 0.30%
2.Some residual elements ,like Cu and Sn ,can be controlled,because they are harmful to the property .
DNV A Steel Mechanical properties:
|
Grade |
Rm (MPa) |
Re(MPa) min |
A% min |
Akv/J min |
||||||
|
DNV A |
400-520 |
235 |
22 |
E.T °C |
Thickness (mm) |
|||||
|
20 |
≤ 50 |
>50-70 |
>70-100 |
|||||||
|
|
L |
C |
L |
C |
L |
C |
||||
|
- |
- |
34 |
24 |
41 |
27 |
|||||
Note: In the list ; Rm: tensile strength ; Re: Yield strength ; A%: elongation ; E.T: experimental temperature ; L: lengthways ; C: crosswise.
Because this steel contains a small amount of V, Ti, Nb and other elements of grain refinement, and in order to reduce the hardening tendency of cracks to prevent cold(ing) crack, the use of welding wire energy may be more.
DNVA Steel Delivery state:
| Grade |
category |
The thickness of steel |
||||
|
≤ 12 |
>12.5-25 |
>25-35 |
>35-50 |
>50-100 |
||
|
DNV A |
Plate/sheet |
A(-) |
N(-),TM(-) |
|||
|
Profile steel |
- |
|||||
Note: 1. delivery condition: A =Any ; N=Normalized ; CR=Control Rolled ; TM=TMPC, Temperature - deformation control rolling; AR*= Can be hot rolled with the agreement of Classification Society ; CR*=Can be control rolled with the agreement of Classification Society .
2. The Figure in the ( ) means the sampling volume to do the impact test, the unit is Ton.(-) means without impact test.
3. For the steel of thickness above 50mm, if the steel has passed rain refinement process and normalizing or heat engine controlled method, impact energy test can be avoided.
Contrast in the different standard
| ASTM A131M |
TOCT 5521 |
JIS G3106 |
BS LR |
GB712 |
|
A |
A |
A |
A |
DNV A shipbuilding plate has low alloy content, grain refinement elements like V, Ti, Nb, etc. Welding performance is superior. Preheating before welding is generally not proceeded, but it is done if it is at a low temperature or super thickness of structural components is welded, that is , it needs to take preheating measures. Our steel has exported to many countries ,like Korea,Viet Nam,Singapore,etc,and has a good reputation in the world.
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