First, a Basic Introduction to Q355NF Steel Plate
Q355NF steel plate is a low-alloy, high-strength structural steel plate widely used in various fields for its excellent mechanical properties and corrosion resistance. The “Q” in its designation indicates yield strength, “355″ indicates a yield strength of 355 MPa, “N” indicates normalized delivery, and “F” indicates an impact test temperature of -60°C.
Second, the chemical composition of Q355NF steel plate.
Carbon: ≤0.20% (content controlled within a certain range to ensure the steel’s strength and hardness).
Silicon: ≤0.50%
Manganese: 0.90-1.65%
Phosphorus and sulfur: ≤0.035% each (content controlled to improve the steel’s corrosion resistance).
Niobium, vanadium, and titanium: trace amounts added to refine grain size and enhance strength and toughness.
Third, the mechanical properties of Q355NF steel plate. Q355NF steel plate exhibits excellent mechanical properties, with a yield strength of no less than 355 MPa, a tensile strength between 470 and 630 MPa, and an elongation of no less than 22%. It also exhibits excellent low-temperature impact toughness, maintaining stable performance at temperatures as low as -60°C. Low-temperature impact toughness test temperature: -60°C.
Fourth, the performance characteristics of Q355NF steel plate: It can maintain stable performance in extremely cold environments, making it suitable for structures or equipment that must operate under low-temperature conditions.
Fifth, Q355NF Steel Plate Manufacturing Process
The manufacturing process of Q355NF steel plate includes converter smelting, LF refining, VD vacuum degassing, continuous casting, and rolling. Strict process control ensures the steel plate’s uniform chemical composition, fine microstructure, and stable performance. Furthermore, the steel plate undergoes normalizing treatment to eliminate internal stresses and improve microstructure uniformity and toughness.
Sixth, Q355NF Steel Plate Applications
Due to its high strength, good toughness and ductility, excellent low-temperature impact toughness, and good weldability and corrosion resistance, Q355NF steel plate is widely used in a variety of fields:
- Bridge Industry: Used in the construction of large bridges and viaducts that withstand enormous loads and stresses.
- Construction Industry: Used in the construction of large public, industrial, and residential buildings, such as hospitals, schools, and gymnasiums.
- Vehicle Industry: Used in the manufacture of automotive chassis, frames, and other components, ensuring vehicle safety and stability.
- Marine Industry: Used in the manufacture of ship structural components and decks, ensuring durability in marine environments. – Mechanical Manufacturing: Used in the manufacture of various large-scale machinery and parts, such as excavators, cranes, and wind turbines.
- Petrochemical Industry: Used in the manufacture of equipment such as crude oil storage tanks and reactors, which must withstand high pressure, high temperature, and corrosive media.
Post time: Sep-02-2025