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Ship Hull Structural Steel
Delivery Standard of Ship Hull Structural Steel
| Classification Society | Certificate Grade | Specification Thickness*width*length (mm) |
|---|---|---|
|
China Classification society |
A 、B 、D、AH32 、DH32、AH36 、DH36 |
3~25*900~2130*2000~ 16000 |
|
American Bureau of Shipping |
AB/A 、AB/B 、AB/D 、AB/E |
≤25*900~2130*2000~ 16000 |
|
LR British Corporation |
LR-A 、LR-B 、LR-D 、LR-E |
≤25*900~2130*2000~ 16000 |
|
Bureau Veritas |
BV-A、BV-B |
≤12*900~2130*2000~ 16000 |
Length: in accordance with the length of the sheet,0-10mm
Profile: sheet flatness ≤6mm within 1000mm. The stress shall be released through high straightening force and high deformation force.
Width: 0-6mm for the sheet with side trimmed, the width shall be controlled by the mill for the sheet without side trimmed.
Mechanical Property of Ship Hull Structural Steel
| Mechanical Property | |||||||
|---|---|---|---|---|---|---|---|
|
Steel Grade |
Thickness (mm) |
Y.S., σs MPa |
T.S., σb MPa |
Elongation, δ % |
Impact Temperature (C) |
Impact energy, Akv J |
|
|
Longitudinal |
Transverse |
||||||
|
A |
2-22 |
235 |
400-520 |
≥22 |
20 |
- |
- |
|
B |
0 |
27 |
20 |
||||
|
D |
2-22 |
≥235 |
400-520 |
≥22 |
-20 |
≥27 |
≥20 |
|
DH32 |
2-22 |
≥315 |
440-570 |
≥22 |
-20 |
≥31 |
≥22 |
|
DH36 |
2-22 |
≥355 |
490-630 |
≥21 |
-20 |
≥34 |
≥24 |
Product Precision
Thickness: the thickness deviation of the sheet shall conform to the higher precision requirement in table 5 of GB/T 709.
| Product Precision | ||||
|---|---|---|---|---|
|
Nominal thickness |
Higher precision PT.B |
|||
|
Nominal width |
||||
|
600 -1200 |
>1200 -1500 |
>1500 -1800 |
>1800 |
|
|
0.8 -1.5 |
± 0.10 |
± 0.12 |
- |
- |
|
>1.5 - 2.0 |
± 0.13 |
± 0.14 |
± 0.14 |
- |
|
>2.0 - 2.5 |
± 0.14 |
± 0.15 |
± 0.17 |
± 0.20 |
|
>2.5 - 3.0 |
± 0.15 |
± 0.17 |
± 0.19 |
± 0.21 |
|
>3.0 - 4.0 |
± 0.17 |
± 0.18 |
± 0.21 |
± 0.22 |
|
>4.0 - 5.0 |
± 0.19 |
± 0.21 |
± 0.22 |
± 0.23 |
|
>5.0 - 6.0 |
± 0.21 |
± 0.22 |
± 0.23 |
± 0.25 |
|
>6.0 - 8.0 |
± 0.23 |
± 0.24 |
± 0.25 |
± 0.28 |
|
>8.0 - 10.0 |
± 0.26 |
± 0.26 |
± 0.27 |
± 0.32 |
|
>10.0 - 12.5 |
± 0.28 |
± 0.29 |
± 0.30 |
± 0.36 |
|
>12.5 - 15.0 |
± 0.30 |
± 0.31 |
± 0.33 |
± 0.39 |
|
>15.0 - 25.4 |
± 0.32 |
± 0.34 |
± 0.37 |
± 0.42 |
For the strip(continuous rolled) with minimum yield strength Re≥345MPa, the thickness deviation shall be increased by 10%.
Length: in accordance with the length of the sheet,0- 10mm.
Width: 0-6mm for the sheet with side trimming, the width shall be controlled by the mill for the sheet without side trimming.
Profile: sheet unflatness, ≤6mm within 1000mm.
The stress shall be released through high straightening force and high deformation force.
