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GL DH32TM

GL DH32TM  GL DH32TM  GL DH32TM

GL DH32TM shipbuilding steel plate and sheet

GL DH32TM Steel Description:

The steel for shipbuilding and oil platform---DH32TM, is the high 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.This kind of steel can be used in the manufacture of the ocean ship's hull structure whose weight is above 10000 tons.

GL DH32TM Steel Application :
GL DH32TM 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 DH32TM Steel chemical composition by [%]:

Grade

C max

Si ax

Mn

P max

S max

Als min

Ti max

Cu max

Cr max

Ni max

Mo max

GL DH32TM

0.18

0.50

0.90-1.60

0.035

0.035

0.015

0.02

0.35

0.20

0.40

0.08

Note: Generally speaking CE will be ≤ 0.40%. If the delivery condition is TMPC, the CE will be : ≤ 0.36% (thickness ≤ 50mm),≤0.38%( when the thickness >50-100).
Ceq% =(C+Mn)/6+(Cr+Mo+V)/5+(Ni+Cu)/15.

GL DH32TM Steel Mechanical properties:


Grade

Rm
(MPa)

Re(MPa) min

A% min

Akv/J min

GL DH32TM

440-570

315

22

E.T °C

Thickness (mm)

-20

≤ 50

>50-70

>70-100

L

C

L

C

L

C

31

22

38

26

46

31

 

 

 


Note: In the list , Rm: .tensile strength,Re: Yield strength,A%: elongation, E.T: experimental temperature,L: lengthways, C: crosswise.

GL DH32TM Steel  Delivery state:

Grade

Fine grains elements

category

The thickness of steel

≤ 12

>12.5-20

>20-25

>25-35

>35-50

>50-100

GL DH32TM

Nb+V or V

Plate/
sheet

A(50)

N(50),CR(50),TM(50)

N(50),CR(25),TM(50)

Profile steel

N(50),CR(50),TM(50),AR*(25)

-

Al or Al+Ti

Plate/
sheet

A(50)

AR*(25)

-

N(50),CR(50),TM(50)

N(50),CR(25),TM(50)

Profile steel

A(50)

N(50),CR(50),TM(50),AR*(25)

-

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.

Contrast in the different standard

ASTM A131M

TOCT 5521

JIS G3106

BS LR

GB712

DH32

D32

SM490B SM490C

DH32

D32

GL DH32TM structural steel hull is a low-carbon steel with  excellent  welding performance. A variety of welding method can be used for welding . GL DH32TM 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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