Premium Galvanized Angle Steel A36 Q195 Q235 Q345 Sizes

What's the maximum thickness for Q235?
A: Commercially available up to 200mm; yield strength decreases with thickness.
 Is Q235 magnetic?
A: Yes (ferromagnetic, like most carbon steels).
 What is the thermal conductivity of Q235?
A: ~50 W/(m·K) (room temp).
 What is the coefficient of thermal expansion of Q235?
A: ~12×10⁻⁶ /°C (20–100°C).
 Why is Q235 so widely used?
A: Low cost, good strength, excellent weldability/formability, easy machining, abundant supply-ideal for general structural and non-critical applications.