Q345b hot-dip galvanized square tubes are a common structural steel.
1. Strength: Q345b hot-dip galvanized square tubes have a yield strength of 345 MPa, meaning they will undergo plastic deformation without breaking before reaching this stress level. Compared to lower-strength steels like Q235, Q345b has higher tensile strength and yield strength, allowing it to withstand greater forces without breaking.

2. Toughness: Q345b hot-dip galvanized square tubes exhibit excellent toughness. Their V-notch impact energy index in an impact test is 27 J, indicating they can absorb significant energy without breaking. Furthermore, the hot-dip galvanizing layer improves the steel's corrosion resistance, maintaining excellent mechanical properties and durability even in harsh environments.

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