AH690 Shipbuilding steel plate is a high-strength ship plate and steel for offshore platforms. The size, shape, weight and allowable deviation of the steel plate should comply with the provisions of GB/T709, and the thickness deviation is 0.3mm.
Delivery status of AH690 shipbuilding steel plate
1, AH690 shipbuilding steel plate is usually delivered in the state of quenching and tempering, normalizing, thermomechanical rolling + tempering heat treatment.
2, TheAH690 shipbuilding steel plate shall be delivered by shearing or flame cutting.
The Chemical composition of AH690 shipbuilding steel plate: The chemical composition of AH690 steel (melting analysis) should meet the requirements in the following table (%)
Chemical composition requirements of AH690 shipbuilding steel plate:
| C |
Si |
Mn |
P |
S |
N |
|
≤0.21 |
≤0.55 |
≤1.7 |
≤0.03 |
≤0.03 |
≤0.02 |
The added alloying elements and grain-refining elements AI, Nb, V, Ti shall comply with the relevant standards approved or recognized by the classification society. The crack susceptibility coefficient Pcm is to be calculated by the formula instead of carbon equivalent, and its value is to comply with the standards approved by the classification society.
Non-destructive testing of AH690 shipbuilding steel plate Z-direction steel plates should be subjected to ultrasonic flaw detection, and the level of flaw detection should be indicated in the contract. According to the requirements of the buyer, other steel plates can also be subjected to non-destructive testing by agreement between the supplier and the buyer.
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