S690Q Steel Plate: Performance, Composition and Applications

• “S” stands for Structural Steel, indicating that the steel plate is specially designed for structural applications;
• “690” means its yield strength is as high as 690MPa, highlighting its excellent strength performance;
• “Q” represents that the steel plate is in the quenched and tempered state, ensuring it has outstanding mechanical properties.

✅️ Performance and Characteristics

✅️ Chemical Composition of S690Q Steel Plate

• Carbon (C): ≤ 0.2%
• Silicon (Si): ≤ 0.8%
• Manganese (Mn): ≤ 1.7%
• Phosphorus (P): ≤ 0.025%
• Sulfur (S): ≤ 0.015%
• Nickel (Ni): ≤ 2%
• Chromium (Cr): ≤ 1.5%
• Molybdenum (Mo): ≤ 0.7%
• Copper (Cu): ≤ 0.5%
• Niobium (Nb): ≤ 0.06%
• Vanadium (V): ≤ 0.12%
• Titanium (Ti): ≤ 0.05%
• Nitrogen (N): ≤ 0.015%
• Boron (B): ≤ 0.005%

✅️ Mechanical Properties of S690Q Steel Plate

• Yield Strength: ≥ 690 MPa (some products exceed 650 MPa)
• Tensile Strength: 770-940 MPa
• Elongation: ≥ 14%
• Impact Toughness: ≥ 30J at -20℃ (some reach 34J), ≥ 27J at -40℃

✅️ Differences Between S690Q Steel Plate and National Standard Q690D Steel Plate

• Chemical Composition: The contents of Ni and Cr in S690Q Steel Plate are slightly higher, while the C content in Q690D Steel Plate is slightly lower.
• Impact Energy: The impact energy of S690Q Steel Plate is ≥ 40J at -20℃, while that of Q690D Steel Plate is ≥ 34J.
• Substitutability: The two have similar mechanical properties, but the differences in chemical composition require selection according to specific engineering needs for application fields.

✅️Applications of S690Q Hot Rolled Steel Plate

• Heavy Machinery: Used to manufacture parts and structural components of heavy machinery, such as lifting machinery and mining machinery.
• Bridge Engineering: In bridge engineering, S690Q Steel Plate can be used to manufacture key load-bearing components of bridges, improving the load-bearing capacity and safety of bridges.
• Marine Engineering: In marine engineering fields such as offshore platforms and submarine pipelines, S690Q Steel Plate is widely applied due to its high strength and good corrosion resistance.
• Building Structures: In building structures such as high-rise buildings and large stadiums, S690Q Steel Plate can be used to manufacture key load-bearing components, improving the overall stability and safety of buildings.

If you want to learn about or purchase other hot rolled steel plates from GNEE, you can send an email to [email protected]. We will be very happy to serve you.