The tensile strength of Q345B steel plate is expressed as the unit of force divided by the cross-sectional area; in the metric system, this unit is called Pascal. 1 Pascal is 1 Newton per square meter in the Q345B steel plate (the force required to accelerate a 1 kilogram object to 1 meter per second). Q345B steel plate has a tensile strength of 470 ~ 630 MPa (in millions) and a yield strength of 345 MPa. Like most steels of the same type, Q345B steel plate is stretched before being pulled apart, usually 20-21% of the original length.
Q345B steel plate has a density of about 7.8 (water is 1.0), a thickness of usually between 2 mm and 12.7 mm (12.7 mm is about half an inch thick), and the Q345B steel plate is usually sold in two parts of 1 to 1.35 m wide. By comparison, a 2mm thick, 1m wide and 3m long Q345B steel plate has a volume of 0.002 * 1 * 3 or 0.006 cubic meters and a mass of 0.006 * 7.8 = 0.0468 kg.
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