D420 shipbuilding steel plate owned higher yield strength and tensile strength. Ship plate D420 is the Hull structural steel,with it's good toughness properties, higher strength,strong corrosion-resistance,the processing properties,and welding properties.In the steel standard ABS DQ43 is the best equvialent steel grade with D420.
D420 ship steel Chemical composition heat analysis
| Element | D420 Max % | Element | D420 max % |
| C | 0.20 | Ni | 0.40 |
| Mn | 1.70 | Mo | 0.08 |
| Si | 0.10-0.55 | Al | 0.020 min |
| S | 0.030 | Nb | 0.20-0.05 |
| P | 0.030 | V | 0.05-0.10 |
| Cu | 0.35 | Ti | 0.0007-0.05 |
| Cr | 0.20 | N |
D420 is applied to extra high strength steels, which is defined as steel with specified min yield stress of 420Mpa. The max yield is 690Mpa in A690.
D420 steel grade shall be killed and find grain treated. Steel grade of strength levels up to and including 500Mpa should be supplied in Normalized, TM or QT condition. Steel grade of strength levels above 500Mpa shall be supplied in TM or QT delivery condition.
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