Grade D is a kind of ship steel material under the standard ASTM A131.
ASTM A131 Grade D application:
Shipbuilding steel Grade D is a common tensile strength steel . ASTM A 131 Grade D steel plate is usual for shipbuilding and oil platform purpose. The shipbuilding steel grade D is mainly 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.
ASTM A131 Grade D characteristics:
D shipbuilding steel is the Hull structural steel which with a good toughness properties, higher strength,strong corrosion-resistance,the processing properties,and welding properties.
Grade D steel Chemical Composition %:
| Grade | C max | Si | Mn max | P max | S max | Als min |
| Grade D | 0.21 | 0.10-0.35 | 0.60 | 0.035 | 0.035 | 0.015 |
Note: CE: C+1/6Mn ≤ 0.40% Cu ≤ 0.35%,Ni ≤ 0.30%
Grade D steel Mechanical Property
| Grade | Rm (MPa) | Re(MPa) min | A% min | Akv/J min | ||||||
| Grade D | 400-520 | 235 | 22 | E.T °C | Thickness (mm) | |||||
| -20 | ≤ 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.
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