1. Main chemical composition
The main chemical components of EQ51 ship plate steel include carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S) and various alloy elements such as chromium (Cr), nickel (Ni), copper (Cu), etc. The content and proportion of these elements have a direct impact on the strength, toughness, corrosion resistance and other properties of the steel plate.
Element Content range (mass percentage)
Carbon (C) The carbon content may vary depending on different production processes and performance requirements. Some data show that its content can reach 0.22%, but the more common range may be 0.04-0.06%
Silicon (Si) 0.10-0.15%
Manganese (Mn) 0.9-0.95%
Phosphorus (P) ≤0.018%
Sulfur (S) ≤0.005%
Chromium (Cr) 0.31-0.39%
Nickel (Ni) 0.31-0.41%
Copper (Cu) 0.21-0.23%
Aluminum (Als) 0.020-0.045% (mentioned in some data)
Molybdenum (Mo) 0.14-0.19% (mentioned in some data)
Niobium (Nb) 0.075-0.085% (mentioned in some data)
Calcium (Ca) 0.0020～0.0030% (mentioned in some materials)
2. Special ingredients and performance improvement
Rare earth elements: Some materials mentioned that trace amounts of rare earth elements were added to EQ51 steel plates, which helps to improve the strength and ductility of the steel plates, while enhancing their corrosion resistance and wear resistance.
Alloy elements: The addition of alloy elements such as chromium (Cr) and nickel (Ni) can significantly improve the corrosion resistance and strength of the steel plates. These elements form stable compounds with other elements in steel, effectively preventing the corrosion of steel in marine environments.
3. Summary
The chemical composition of EQ51 ship plate steel has been carefully designed and optimized to ensure that it has high strength, high toughness, excellent corrosion resistance and other properties. These properties make EQ51 ship plate steel widely used in shipbuilding, offshore wind power, offshore oil extraction, cross-sea bridges, and naval ships. At the same time, with the continuous advancement of technology and the improvement of production processes, the performance of EQ51 ship plate steel will be further improved and optimized.
