Do you know the difference between A516GR70 and Q345R?
Differences-between-A516GR70-and-Q345R.PDF
A516GR70 and Q345R are two commonly used pressure vessel steels. They have significant differences in standard systems, chemical compositions, mechanical properties and applicable environments. The following is a detailed comparison:
Mechanical Properties
| Property | A516GR70 | Q345R |
|---|---|---|
| Tensile Strength | 485-620 MPa | 510-640 MPa |
| Yield Strength | ≥260 MPa | ≥345 MPa |
| Elongation | ≥21% (50mm) | ≥21% |
| Impact Energy | ≥27J @ -20°C | ≥34J @ -20°C |
Key Differences:
Q345R has higher yield strength (the "345" denotes ≥345 MPa).
Q345R requires better low-temperature impact toughness.
Temperature Range
A516GR70: -30°C to 450°C (suitable for low-to-medium temperatures).
Q345R: -20°C to 475°C (better for ambient/medium temperatures, but inferior to A516GR70 in cryogenic service).
Other Differences
Delivery Condition:
A516GR70: Typically normalized (N) or TMCP.
Q345R: Normalized (N) or as-rolled (AR), depending on thickness.
Weldability: Q345R performs better due to lower carbon and micro-alloying.
Cost: Q345R is generally more economical in China.
Typical Applications
A516GR70: Oil/gas storage tanks, heat exchangers, boilers (especially for export projects).
Q345R: Domestic pressure vessels, boilers, reactors (e.g., GB 150-designed equipment).
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