Q345 is a type of low - alloy high - strength steel plate with a yield strength of approximately 345 MPa. It is widely used in construction, bridges, vehicles, and other fields due to its good low - temperature performance, plasticity, and weldability1. The Q345 series of steel is divided into five grades: A, B, C, D, and E. The following is an introduction to Q345A, Q345B, and Q345C:

Differences in Impact Temperature1

Q345A: No impact test is required.

Q345B: Impact test is carried out at room temperature of 20°C.

Q345C: Impact test is carried out at 0°C. The lower the impact temperature, the better the low - temperature performance of the steel, which means it can maintain better toughness and ductility at low temperatures, reducing the risk of brittle fracture.

Differences in Chemical Composition

Q345A1: The chemical composition requirements are C ≤ 0.20, Mn ≤ 1.7, Si ≤ 0.55, P ≤ 0.045, S ≤ 0.045, and V 0.02 - 0.15.

Q345B and Q345C: On the basis of Q345A, the requirements for harmful elements P and S are gradually reduced, and the overall chemical composition is more strictly controlled to ensure better performance.

 

 

 

Thinkness	1.0-150mm
width	1500-2500mm
Length	6-12m

 

 

 

Applications

These steel plates are widely used in various architectural and engineering structures2. Q345C is often used in some key components that require higher reliability and better low - temperature performance, such as in the construction of bridges in cold regions. Q345A and Q345B are mainly used in general - purpose structures, such as general building structures and some mechanical equipment supports.

Price

The price of Q345 steel plates is affected by many factors, including thickness, width, length, and market supply and demand. Generally speaking, the FOB price of Q345 steel plates is between $450 and $650 per ton2. The price of Q345C is relatively higher than that of Q345A and Q345B due to its better performance.

 

 

 

 

 

 

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