DNV AH40 shipbuilding steel plate and sheet
DNV AH40 Steel Description:
The steel for shipbuilding and oil platform---AH40, is the high tensile strength steel.
DNV AH40 is the Hull structural steel,with it's good toughness properties, higher strength,strong corrosion-resistance,the processing properties,and welding properties.DNV AH40 steel can be used in the manufacture of the ocean ship's hull structure whose weight is above 10000 tons.
DNV AH40 Steel Application:
AH40 with high strength, good toughness low temperature impact , excellent weldability characteristics, is a kind of high strength ship's hull structure plate.AH40 is used to manufacture medium-sized ocean, coastal and river trade area ship's hull structure.
DNV AH40 Steel chemical composition by [%]:
|
Grade |
C max |
Si max |
Mn |
P max |
S max |
Als min |
Ti max |
Cu max |
Cr max |
Ni max |
Mo max |
Nb |
V |
|
DNV AH40 |
0.18 |
0.50 |
0.90-1.60 |
0.035 |
0.035 |
0.015 |
0.02 |
0.35 |
0.20 |
0.40 |
0.08 |
0.02-0.05 |
0.05-0.10 |
Note: Generally speaking CE will be ≤ 0.40%. If the delivery condition is TMPC, the CE will be : ≤ 0.40% (thickness ≤ 50mm).Ceq% =(C+Mn)/6+(Cr+Mo+V)/5+(Ni+Cu)/15.
DNV AH40 Steel Mechanical properties:
|
Grade |
Rm (MPa) |
Re(MPa) min |
A% min |
Akv/J min |
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|
DNV AH40 |
510-660 |
390 |
20 |
E.T °C |
Thickness (mm) |
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|
0 |
≤ 50 |
>50-70 |
>70-100 |
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|
L |
C |
L |
C |
L |
C |
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|
41 |
27 |
- |
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Note: In the list , Rm: tensile strength,Re: Yield strength,A%: elongation, E.T: experimental temperature,L: lengthways, C: crosswise.
DNV AH40 Steel Delivery state:
|
Grade |
Fine grains elements |
category |
The thickness of steel |
|||||
|
≤ 12 |
>12.5-20 |
>20-25 |
>25-35 |
>35-50 |
>50-100 |
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|
DNV AH40 |
any |
Plate/ |
A(50) |
N(50),CR(50),TM(50) |
- |
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|
Profile steel |
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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.
DNV AH40 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. 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.
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