GL D

GL D shipbuilding steel plate and sheet

GL D Steel Description:
The steel for shipbuilding and oil platform---D, is the common tensile strength steel.
GL D is the Hull structural steel,with it's good toughness properties, higher strength,strong corrosion-resistance,the processing properties,and welding properties.

GL D Steel Application :
GLD 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 D	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 D Steel Mechanical properties:

Grade	Rm (MPa)	Re(MPa) min	A% min	Akv/J min
GL D	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

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

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.

GL D Steel Delivery state:

Grade	category	The thickness of steel
		≤ 12	>12.5-25	>25-35	>35-50	>50-100
GL D	Plate/sheet	A(50)			N(50) CR(50) TM(50)	N(50) TM(50) CR(25)
	Profile steel				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.
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	SM400B SM400C	D	D

GL D 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.Our steel has exported to many countries ,like Korea,Viet Nam,Singapore,etc,and has a good reputation in the world.

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