DNV DH32

DNV DH32 shipbuilding steel plate and sheet

The steel for shipbuilding and oil platform---DH32, is the high tensile strength steel.
DNV DH32 is the Hull structural steel,with it's good toughness properties, higher strength,strong corrosion-resistance,the processing properties,and welding properties.DNV DH32 steel can be used in the manufacture of the ocean ship's hull structure whose weight is above 10000 tons.

DNV DH32 Steel Application :
DH32 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.

DNV DH32 Steel chemical composition by [%]:

Grade	C max	Si max	Mn	P max	S max	Als min	Ti max	Cu max	Cr max	Ni max	Mo max
DNV DH32	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.

DNV DH32 Steel Mechanical properties:

Grade	Rm (MPa)	Re(MPa) min	A% min	Akv/J min
DNV DH32	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.

DNV DH32 structural steel hull is a low-carbon steel with excellent welding performance. A variety of welding method can be used for welding .

DNV DH32 Steel Delivery state:

Grade	Fine grains elements	category	The thickness of steel
			≤ 12		>12.5-20	>20-25		>25-35	>35-50	>50-100
DNV DH32	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

DH32 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. 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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