GL DTM shipbuilding steel plate and sheet
GL DTM Steel Description:
The steel for shipbuilding and oil platform---D, is the common tensile strength steel.
GL DTM is the Hull structural steel,with it's good toughness properties, higher strength,strong corrosion-resistance,the processing properties,and welding properties.
GL DTM Steel Application :
GL DTM is mainly used to manufacture the ship hull structure of ocean, coastal and inland sea areas , shipyards, oil platforms, pipelines in the ocean, coastal power plants, port facilities and other structural parts.
GLD Steel chemical composition by [%]:
|
Grade |
C max |
Si max |
Mn |
P max |
S max |
Als min |
|
GL DTM |
0.21 |
0.35 |
0.60-1.20 |
0.035 |
0.035 |
0.015 |
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 .GL DTM is mainly used to manufacture the ship hull structure of ocean, coastal and inland sea areas , shipyards, oil platforms, pipelines in the ocean, coastal power plants, port facilities and other structural parts.
GL DTM Steel Mechanical properties:
|
Grade |
Rm |
Re(MPa) min |
A% min |
Akv/J min |
||||||
|
GL DTM |
400-520 |
235 |
22 |
E.T °C |
Thickness (mm) |
|||||
|
-20 |
≤ 50 |
>50-70 |
>70-100 |
|||||||
|
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.
GL DTM Steel Delivery state:
Grade |
category |
The thickness of steel |
||||
|
≤ 12 |
>12.5-25 |
>25-35 |
>35-50 |
>50-100 |
||
|
GL DTM |
Plate/sheet |
A(50) |
N(50) |
N(50) |
||
|
Profile steel |
N(50) |
- |
||||
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 |
|
D |
D |
D |
D |
GL DTM 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. We are an outstanding exporter in shipbuilding steel in china,so if you need shipbuilding steel please contact us at any time.
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