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Q: What are Q235R and Q345R?

02/09/2025 15:32:07 1    answers in: Product Standards
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Q245R and Q345R are two commonly used pressure vessel steel plate materials. The "R" in the designation stands for "vessel," and the number indicates the yield strength grade.

Yield Strength:
Q235R has a yield strength of approximately 235 MPa, while Q345R has a yield strength of up to 345 MPa. This means that under the same external force, Q345R is more resistant to deformation and offers greater structural safety.

Chemical Composition:
Q235R has a relatively high carbon content, while its manganese content is within a certain range. Q345R, on the other hand, has a lower carbon content and stricter control over impurities such as phosphorus and sulfur. This allows Q345R to maintain good strength while also exhibiting superior ductility, toughness, and weldability.

Q235R typically has a temperature limit of around 400°C, making it suitable for low- to medium-temperature and pressure environments. Q345R, on the other hand, boasts increased strength and thermal stability due to the addition of trace alloying elements, allowing for safe long-term use below 450°C. Both steels are widely used in petrochemical, boiler, and storage tank equipment, and the selection process should consider both operating temperature and pressure requirements.

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