DNV B shipbuilding steel plate and sheet
DNV B Steel Description:
The steel for shipbuilding and oil platform---B, is the common tensile strength steel.
It is the Hull structural steel,with it's good toughness properties, higher strength,strong corrosion-resistance,the processing properties,and welding properties.
DNV B Steel Application :
DNV B 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 B Steel chemical composition by [%]:
|
Grade |
C max |
Si max |
Mn |
P max |
S max |
|
DNV B |
0.21 |
0.35 |
0.80-1.20 |
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 .
3. For DNV B steel, if the Si is above 0.1% , the minimum Mn can be decreased by 0.6%. When DNV B steel is under impact energy test, Mn can be lowered to 0.6%;CCS requires Mn of DNV B steel above 0.5%.
DNV B Steel Mechanical properties:
|
Grade |
Rm |
Re(MPa) min |
A% min |
Akv/J min |
||||||
|
DNV B |
400-520 |
235 |
22 |
E.T °C |
Thickness (mm) |
|||||
|
0 |
≤ 50 |
>50-70 |
>70-100 |
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|
L |
C |
L |
C |
L |
C |
|||||
|
27 |
20 |
34 |
24 |
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 B Steel Delivery state:
|
Grade |
category |
The thickness of steel |
||||
|
≤ 12 |
>12.5-25 |
>25-35 |
>35-50 |
>50-100 |
||
|
DNV B |
Plate/sheet |
A(-) |
A(50) |
N(50),TM(50) |
||
|
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 under 25mm, generally speaking, V impact energy test is not required.
Contrast in the different standard
| ASTM A131M |
TOCT 5521 |
JIS G3106 |
BS LR |
GB712 |
|
B |
B |
B |
B |
Shipbuilding steel,generally speaking,a hull structure steel , is to manufacture hull as the requirements of register of shipping. DNV B structural steel hull is a low-carbon steel with excellent welding performance. A variety of welding method can be used for welding .DNV B has little alloy elements and grain refinement elements added, so its weldability is good.
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