Introduction to the Chemical Composition and Properties of Q345NH Weathering Steel Plate
The chemical composition of Q345NH weathering steel includes:
Carbon (C): 0.12 to 0.21%,
Silicon (Si): 0.2 to 2.0%,
Manganese (Mn): 0.7 to 2.0%,
Sulfur (S): ≤ 0.036%,
Phosphorus (P): ≤ 0.034%,
Copper (Cu): 0.10 to 0.40%,
Aluminum (Al): less than 0.2%, with the remainder being iron and trace impurities.
Q345NH weathering steel is known for its excellent mechanical properties, including high toughness, good plasticity, elongation, formability, weldability, wear resistance, heat resistance, and fatigue resistance. Compared to ordinary carbon steel, its weather resistance is 2 to 8 times higher, and its coating performance is 1.5 to 10 times better. This allows it to be used in thinner sections, exposed environments, or even without paint, reducing the need for additional coatings.
One of the key advantages of this steel type is its ability to resist rust and corrosion, which significantly enhances the durability of structural components. This not only extends the service life but also reduces material consumption and energy usage. As a result, it offers great benefits to both manufacturers and end users.
Q345NH weathering steel is widely applied in various industries, such as the manufacturing of containers, railway vehicles, oil rigs, seaport structures, offshore oil platforms, and equipment used in environments containing hydrogen sulfide and other corrosive media. Its unique properties make it an ideal choice for applications where long-term durability and low maintenance are essential.
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