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DNV AH36

DNV AH36  DNV AH36  DNV AH36

DNV AH36  shipbuilding  steel  plate  and  sheet

DNV AH36  Steel Description:
The steel for shipbuilding and oil platform---AH36, 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.
DNV AH36 Steel Application :
DNV AH36 is with good mechanical properties, welding performance, process performance. DNV AH36 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 AH36 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

Nb

V

DNV
AH36

0.18

0.50

0.90-1.60

0.035

0.035

0.015

0.02

0.35

0.20

0.40

0.08

0.02-0.05

0.05-0.10

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

As for AH36, if the thickness is under 12.5mm, the minimum Mn  is about 0.7%. Besides, aluminum, niobium or vanadium in which one or several elements of grain refinement elements should be added to AH36 Steel.
 
DNV AH36 Steel  Mechanical properties:

Grade

Rm
(MPa)

Re(MPa) min

A% min

Akv/J min

DNV
AH36

490-630

355

21

E.T °C

Thickness (mm)

0

≤ 50

>50-70

>70-100

L

C

L

C

L

C

34

24

41

27

50

34

Note: In the list , Rm: .tensile strength,Re: Yield strength,A%: elongation, E.T: experimental temperature,L: lengthways, C: crosswise.
 
DNV AH36 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
AH36

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

BS LR

GB712

AH36

A36

AH36

A36

AH36 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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