Grade-a-shipsteel

LR, ABS, NK, GL, DNV, BV, KR, RINA, CCS Grade A Shipbuilding steel plate

Capable Classification Society Quality Authentication from LR, ABS, NK, GL, DNV, BV, KR, RINA, CCS,Grade A steel plate is used for shipbuiling's hull structure and platform. The shipbuilding steel plate grade A is the common tensile strength steel. It has good toughness properties and higher strength, strong corrosion-resistance,the processing properties,and welding properties.ASTM A131 Grade A steel plate  can be used in the manufacture of the ship's hull structure whose weight is below 10000 tons,and usually do navigation around coastal and river area.

Grade A shipbuiling steel plate specification:
Thickness: 4mm to 260mm, 
Width: 1200mm to 4000mm
Length: 3000mm to 18000mm.

Grade A steel plate Chemical Composition


Grade

C max

Si max

Mn

P max

S max

Grade A

0.21

0.50

 ≥ 2.5C

0.035

0.035

Note: CE: C+1/6Mn ≤ 0.40%
Cu ≤ 0.35%,Ni ≤ 0.30%≤

Grade A steel plate Mechanical Property


Grade

Rm
(MPa)

Re(MPa) min

A% min

Akv/J min

Grade A

400-520

235

22

E.T °C

Thickness (mm)

20

50

>50-70

>70-100

L

C

L

C

L

C

-

-

34

24

41

27

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

Condition Of Delivery


Grade

category

The thickness of steel

≤12

>12.5-25

>25-35

>35-50

>50-100

Grade A

Plate/sheet

A(-)

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

Profile steel

-

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 isTon.(-) means without impact test.Contrast in the different standard


ASTM A131M

TOCT 5521

JIS G3106

BS LR

GB712

Grade A

A

SM400A

A

A

Grade A steel plate Available Specification


variety 
Thickness (mm) Width (mm) Longth/ inner diameter (mm)
Shipbuilidng plate cutting edges 6~200 1500~3000 3000~15000
non- cutting edges 1300~3000
Shipbuilidng coil cutting edges 1.2~19 1500~2000 760+20~760-70
non-cutting edges 1510~2010

Grade A steel plate theoretical weight


Thickness (mm) 
theoretical weight Thickness (mm) theoretical weight
Kg/ft2 Kg/m2 Kg/ ft2 Kg/m2
6 4.376 47.10 25 18.962 196.25
7 5.105 54.95 26 20.420 204.10
8 5.834 62.80 28 21.879 219.80
10 7.293 78.50 30 23.337 235.50
11 8.751 86.35 32 25.525 251.20
12 10.21 94.20 34 26.254 266.90
14 10.939 109.90 35 27.713 274.75
16 11.669 125.60 40 29.172 314.00
18 13.127 141.30 45 32.818 353.25
20 14.586 157.00 48 35.006 376.80
22 16.044 172.70 50 36.464 392.50
24 18.232 188.40      

Grade A steel plate dimensional deviation


nominal thickness(mm)
The thickness deviation with following width (mm)
≤1200 >1200~1500 >1500~1800 >1800
>6.0~8.0 ±0.29 ±0.30 ±0.31 ±0.35
>8.0~10.0 ±0.32 ±0.33 ±0.34 ±0.35
>10.0~12.0 ±0.35 ±0.36 ±0.37 ±0.43

nominal thickness(mm)

 

minus deviation (mm) The thickness deviation with following width (mm)
> 1000 ~1200 > 1200 ~1500 > 1500 ~1700 > 1700 ~1800 > 1800 ~2000 > 2000 ~2300 > 2300 ~2500 > 2500 ~2600 2600 ~2800 > 2800 ~3000
>12~25 -0.8 +0.2 +0.2 +0.3 +0.4 +0.6 +0.8 +0.8 +1.0 +1.1 +1.2
>25~30 -0.9 +0.2 +0.2 +0.3 +0.4 +0.6 +0.8 +0.9 +1.0 +1.1 +1.2
>30~34 -1.0 +0.2 +0.3 +0.3 +0.4 +0.6 +0.8 +0.9 +1.0 +1.2 +1.3
>34~40 -1.1 +0.3 +0.4 +0.5 +0.6 +0.7 +0.9 +1.0 +1.1 +1.3 +1.4
>40~45 -1.2 +0.4 +0.5 +0.6 +0.7 +0.8 +1.0 +1.1 +1.2 +1.4 +1.5
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