EH690 low alloy steel is mainly used for shipbuilding and marine engineering, oil and gas exploration, storage and transportation Strength structural steel for ships and marine engineering
Characteristics of EH690 structural steel for offshore engineering:
1. It has high strength and resists the impact of wind current above the water surface. It has good resistance to laminar tearing and avoids tearing when external force is received in the thickness direction.
2. It has good low-temperature impact performance, and some offshore platform steels need to have the performance to serve in extremely cold environments.
3. It has good welding performance, and the welding joint performance has the same or similar mechanical properties as the base material, and the safety of the overall structure of the offshore platform.
4. Steel purity requirements. Steel needs to have a very low content of S, P and other magazine elements, and has high requirements for the appearance, type and distribution of inclusions, to avoid fatigue failure of offshore platforms under the influence of typhoon and water movement, and to protect life and property Safety.
5. Corrosion resistance requirements. Because marine engineering structural steel plates have been exposed to salt spray, moisture and seawater for a long time, they are subject to the erosion of seawater and marine organisms to produce severe electrochemical corrosion. The paint film is prone to severe saponification and aging, resulting in very serious structural corrosion. It reduces the mechanical properties of structural materials and shortens their service life. Moreover, because they are far away from the coast, they cannot be repaired and maintained on a regular basis like ships, so the requirements for their corrosion resistance are higher.
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