Q690 Carbon Steel Plate is a high-strength low-alloy steel plate that belongs to the Chinese national standard GB/T 16270 series, which defines quenched and tempered high-strength structural steels. This material is engineered to deliver exceptional strength and toughness while maintaining acceptable weldability and formability characteristics.
Q690 Carbon Steel Plate is a high-strength low-alloy steel plate that belongs to the Chinese national standard GB/T 16270 series, which defines quenched and tempered high-strength structural steels. This material is engineered to deliver exceptional strength and toughness while maintaining acceptable weldability and formability characteristics.
Composition:
Q690 carbon steel plate primarily consists of:
- Iron (Fe) as the base element.
- Carbon (C): It's a crucial component that contributes to the high strength of Q690 steel by solid solution strengthening mechanism. The carbon content in Q690 is higher than mild or low-carbon steels but still controlled to maintain good welding performance.
- Other alloying elements such as manganese (Mn), silicon (Si), chromium (Cr), nickel (Ni), molybdenum (Mo), vanadium (V), etc., are added in specific proportions to enhance the mechanical properties, hardenability, and improve toughness without compromising the weldability.
Characteristics:
1. High Strength: Q690 steel plates have a minimum yield strength of around 690 MPa, providing excellent resistance to deformation under heavy loads.
2. Toughness: Through quenching and tempering processes, Q690 steel offers outstanding impact toughness even at low temperatures.
3. Weldability: Despite its high strength, Q690 maintains satisfactory weldability with appropriate preheating and post-weld heat treatment when necessary.
4. Formability: Although not as formable as mild steel grades, Q690 can be cold-formed using suitable methods due to its balanced chemistry and manufacturing process.
5. Wear Resistance: Due to its high hardness and strength, it provides improved wear resistance compared to conventional carbon steels.
Use:
Q690 Carbon Steel Plates find their applications in various demanding industries:
1. Structural Engineering: Used for making high-load-bearing components in buildings, bridges, and other large-scale structures where weight reduction is critical.
2. Heavy Machinery: Components like crane booms, excavator arms, lifting equipment, and other load-bearing parts in heavy machinery benefit from the high strength-to-weight ratio of Q690 steel.
3. Pressure Vessels: For manufacturing thick-walled pressure vessels and storage tanks that require high strength and durability.
4. Offshore Platforms: In offshore oil and gas platforms, Q690 steel plates are used for constructing jackets, decks, and other critical load-bearing structures that need to withstand harsh marine environments and heavy loads.
5. Wind Turbine Towers: To construct wind turbine towers, where high strength and lightweight materials are essential for efficient energy production.
It's important to note that actual specifications may vary depending on the manufacturer and the intended application. Always refer to official material data sheets or supplier documentation for precise details about a specific Q690 carbon steel plate product.
