DNV A32

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Bebon steel —— The most professional exporter on weathering resistant steel

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DNV A32 shipbuilding steel plate and sheet

DNV A32 Steel Description:

The steel for shipbuilding and oil platform‐‐‐A32, is the high tensile strength steel.

DNV A32 is the Hull structural steel,with it's good toughness properties, higher strength,strong corrosion‐

resistance,the processing properties,and welding properties.

DNV A32 Steel Application :

DNV A32 steel can be used in the manufacture of the ocean ship's hull structure whose weight is above

10000 tons. A32 with high strength, good toughness low temperature impact , excellent weldability

characteristics, is a kind of high strength ship's hull structure plate. So DNV A32 is used to manufacture

medium‐sized ocean, coastal and river trade area ship's hull structure.

DNV A32 Steel chemical composition by [%]:

Grad

e

C

ma

x

Si

ma

x

Mn P

max

S

max

Als

min

Ti

max

Cu

max

Cr

max

Ni

max

Mo

max

DNV

A32

0.1

8

0.5

0

0.90‐

1.60

0.03

5

0.03

5

0.01

5 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.








As for A32, 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 A32 Steel.

DNV A32 Steel Mechanical properties:

Grade Rm

(MPa)

Re(MPa

) min

A%

minAkv/J min

E.T °C Thickness (mm)

≤ 50 >50‐

70

>70‐

100

L C L C L C

DNV

A32

440‐

570 315 22

0

3

1

2

2

3

8

2

6

4

6 31

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.

DNV A32 Steel Delivery state:

The thickness of steel

Grade

Fine

grains

elements

categor

y ≤ 12 >12.5‐

20

>20‐

25

>25‐

35

>35‐

50 >50‐100

http://www.bebonchina.com/Steel-plate-sheet/L-450MBStE-4457-TM-X-65.html








Plate/

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

N(50),CR(2

5),TM(50) Nb+V or V

Profile

steel

A(50

) N(50),CR(50),TM(50),AR*(25) ‐

AR*(25) ‐ Plate/

sheet A(50)

N(50),CR(50),TM(50) N(50),CR(2

5),TM(50)

DNV

A32

Al or Al+Ti

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

AH32 A32 SM490B

SM490C AH32 A32








Shipbuilding steel,generally speaking,a hull structure steel , is to manufacture hull as the requirements of

register of shipping. Shipbuilding steel includes four grades,that is A,B,C,D. Grade A means impact test at 20°C;

Grade B is impact test at 0°C; Grade C means impact test at ‐20°C; Grade D is impact test at ‐40°C. DNV A32

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.

DNV A32

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