Chemical composition and production process of EH690 marine steel

EH690 steel plate is marine engineering structural steel plate. In the construction of marine channels, it has high requirements for strength and low temperature impact resistance. EH690 marine steel requires excellent welding performance and is also very strict in the lamellar tear resistance index (Z-direction function reaches 35%).

EH690 marine steel chemical composition:

Remarks on ingredients: Als can be replaced by Alt, at this time Alt≥0.02; grain refinement elements Al, Nb, V, Ti can be added individually or in any combination. When added alone, its content should not be lower than the lower limit specified in the table. If two or more grain refinement elements are added in combination, the lower limit of the single element content in the table does not apply (DNV: When Al+Nb , Alt≥0.015, Nb≥0.01. When Al+V, Alt≥0.015, V≥0.03). Nb+V+Ti≤0.12).

EH690 marine steel delivery status and Z-direction performance:
Delivery status of EH690 steel plate: According to user requirements, it can be delivered in different statuses such as hot rolling, normalizing, tempering, normalizing and tempering, quenching and tempering, TMCP, etc.

Z-direction performance of EH690 marine steel plate: Z15, Z25, Z35

EH690 marine steel production process:
Raw materials (scrap steel, pig iron and molten iron) - electric furnace (100-ton electric arc furnace smelting), converter - LF furnace molten steel refining treatment - VD or VOD furnace molten steel vacuum treatment - die casting (various key die casting lines) or continuous casting (large Slab continuous casting machine), (one ingot remelting treatment 50 tons slab type electroslag furnace) - heating (continuous furnace and soaking furnace) - steel plate rolling (4100 and 4200mm rolling mill) - steel plate heat treatment (normalizing and tempering, quenching and tempering) - steel plate cutting inspection - storage.