What is the difference between steel plates Q345B and Q355B?

1 Answers
Juliet
07/30/25 2:44am
Steel plates Q345B and Q355B have the following main differences: 1. Different properties: Q345: It is a type of low-alloy steel. Q355: It is a type of low-alloy high-strength structural steel, widely used in bridges, vehicles, ships, buildings, pressure vessels, special equipment, etc. 2. Different yield strengths of the steel: The "Q" stands for yield strength. Q345: 345 indicates that the yield strength of this steel is 345MPa. Q355: 355 indicates that the yield strength of this steel is 355MPa, and the yield value decreases as the thickness of the material increases.
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