GL BTM shipbuilding steel plate and sheet
GL BTM Steel Description:
The steel for shipbuilding and oil platform---BTM, 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.GL BTM 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.
GL BTM Steel Application :
GL BTM is with good mechanical properties, welding performance, process performance. GL BTM 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 BTM Steel chemical composition by [%]:
| Grade |
C max |
Si max |
Mn |
P max |
S max |
|
GL 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 GL BTM steel, if the Si is above 0.1% , the minimum Mn can be decreased by 0.6%. When GL BTM steel is under impact energy test, Mn can be lowered to 0.6%;CCS requires Mn of GL BTM steel above 0.5%.
GL BTM Steel Mechanical properties:
|
Grade |
Rm |
Re(MPa) min |
A% min |
Akv/J min |
||||||
|
GL BTM |
400-520 |
235 |
22 |
E.T °C |
Thickness (mm) |
|||||
|
0 |
≤ 50 |
>50-70 |
>70-100 |
|||||||
|
L |
C |
L |
C |
L |
C |
|||||
|
27 |
20 |
34 |
24 |
41 |
27 |
|||||
Note: In the list , Rm: .tensile strength,Re: Yield strength,A%: elongation, E.T: experimental temperature,L: lengthways, C: crosswise.
GL BTM Steel Delivery state:
|
Grade |
category |
The thickness of steel |
||||
|
≤ 12 |
>12.5-25 |
>25-35 |
>35-50 |
>50-100 |
||
|
GL BTM |
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 |
GL BTM structural steel hull is a low-carbon steel with excellent welding performance. A variety of welding method can be used for welding .GL BTM has little alloy elements and grain refinement elements added, so its weldability is good. Our steel has exported to many countries ,like Korea,Viet Nam,Singapore,etc,and has a good reputation in the world. So please contact us if you want the steel.
Source:
Tags:
