Capable Classification Society Quality Authentication from LR, ABS, NK, GL, DNV, BV, KR, RINA, CCS Grade B steel,ASTM A131 Grade B steel plate is a kind of shipbuilding steel which is mainly for shipbuilding and platform. Grade B shipbuilding steel plate is a common tensile strength steel. As a professional A131 Grade B shipbuilding steel plate exporter, Bebon international can supply high quality Grade B steel plate in most competitive price. ASTM A 131 shipbuilding steel plates can be used in the manufacture of the ship s hull structure whose weight is below 10000 tons.
Grade B shipbuilding steel plate specification:
Thickness: 6mm-200mm, Width: 1500mm-4000mm, Length: 6000mm-180000mm
Grade B steel Chemical Composition
Grade
|
C max
|
Si max
|
Mn
|
P max
|
S max
|
|
Grade B
|
0.21
|
0.35
|
0.80-1.20
|
0.035
|
0.035
|
Note: CE: C+1/6Mn ≤ 0.40% Cu ≤ 0.35%,Ni ≤ 0.30%≤
Grade B steel Mechanical Property
Grade
|
Rm
(MPa)
|
Re(MPa) min
|
A% min
|
Akv/J min
|
|
Grade B
|
400-520
|
235
|
22
|
E.T °C
|
Thickness (mm)
|
|
0
|
≤ 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.
Grade B steel Condition Of Delivery
Grade
|
category
|
The thickness of steel
|
|
≤ 12
|
>12.5-25
|
>25-35
|
>35-50
|
>50-100
|
|
Grade B
|
Plate/sheet
|
A(-)
|
A(50)
|
N(50),TM(50)
CR(25)
AR*(25)
|
|
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 is Ton.(-) means without impact test.
Grade B steel Contrast in the different standards
ASTM A131M
|
TOCT 5521
|
JIS G3106
|
BS LR
|
GB712
|
|
Grade B
|
Grade B
|
SM400B
SM400C
|
Grade B
|
Grade B
|
Grade B 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 B 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 B 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
|