Introduction to Q890E Standard: Composition, Properties, and Applications

Q890E steel plate is a high-yield-strength low-alloy high-strength structural steel that complies with the GB/T 16270-2009 standard. "Q" stands for yield strength, "890" indicates its minimum yield strength of 890 MPa, and "E" signifies that the material has specific impact energy absorption requirements at low temperatures of -40°C.

Low-Temperature Tensile Performance Indicators

1. Yield Strength: Q890E steel plate maintains a minimum yield strength of at least 890 MPa even at low temperatures of -40°C, ensuring the material's stability and load-bearing capacity in extreme low-temperature environments.

2. Tensile Strength: The tensile strength of Q890E steel plate varies with thickness but typically ranges between 930 and 1100 MPa, providing sufficient toughness to prevent fracture under high loads.

3. Elongation: The elongation of Q890E steel plate is generally no less than 11% at standard thickness, demonstrating the material's ability to undergo plastic deformation during stretching.

4. Impact Energy Absorption: Q890E steel plate requires an impact energy absorption of at least 27J at low temperatures of -40°C, ensuring adequate toughness in low-temperature environments.

5. Chemical Composition: Q890E steel plate contains appropriate amounts of alloying elements such as manganese (Mn), silicon (Si), molybdenum (Mo), chromium (Cr), copper (Cu), vanadium (V), niobium (Nb), titanium (Ti), and aluminum (Al). The addition of these elements helps enhance its strength and toughness.

6. Microstructure: Q890E steel plate typically undergoes quenching and tempering treatment to refine its grain structure, improving its mechanical properties while maintaining toughness at low temperatures.

Low-Temperature Application Areas

1. Polar Engineering: Q890E steel plate is suitable for polar or cold-region engineering projects, such as ice-class ships and polar research stations, where structures must withstand extreme low temperatures and high loads.

2. Low-Temperature Storage Tanks: In the petroleum and chemical industries, Q890E steel plate can be used to manufacture low-temperature storage tanks for liquefied natural gas (LNG) or other low-temperature chemicals.

3. Wind Power Generation: In wind power equipment located in cold regions, Q890E steel plate can be used to manufacture towers and bases, bearing the loads from wind forces and self-weight.

4. Construction Machinery: For construction machinery operating in low-temperature environments, such as excavators and cranes, Q890E steel plate provides the necessary strength and toughness.

5. Military Equipment: In the military field, Q890E steel plate can be used to manufacture armored vehicles and protective structures that need to operate in low-temperature environments.

6. Architectural Structures: In large structures such as high-rise buildings and bridges in cold regions, Q890E steel plate can be used for key load-bearing components to ensure structural stability.

The low-temperature tensile performance indicators of Q890E steel plate ensure its reliability and safety in extreme low-temperature environments, making it suitable for various applications requiring high strength and good low-temperature toughness. Through precise chemical composition control and heat treatment processes, Q890E steel plate can maintain its performance in low-temperature environments.