S275JO and S275JR are both structural steels specified in the European standard EN 10025, but they differ in chemical composition and mechanical properties.
Firstly, regarding material designation, S275 indicates a minimum yield strength of 275 MPa, while J and R refer to different impact toughness standards. Specifically, S275JR indicates an impact test at room temperature, typically requiring a minimum impact energy of 27 J. S275JO, on the other hand, indicates an impact test at 0°C, with a minimum impact energy requirement of 27 J. Thus, S275JO exhibits better toughness at low temperatures, making it suitable for applications in cryogenic environments.
Secondly, due to the different impact toughness requirements, these two steels are used differently in practical applications. S275JR is suitable for general building structures and equipment manufacturing, while S275JO is more suitable for applications requiring lower temperature environments, such as cryogenic pipelines and refrigeration equipment.
S275JO V.S S275JR
| Property | S275J0 | S275JR |
|---|---|---|
| Standard Reference | EN 10025-2:2019 | EN 10025-2:2019 |
| Material Type | Non-alloy structural steel | Non-alloy structural steel |
| Minimum Yield Strength | ≥275 MPa (for thickness ≤16mm) | ≥275 MPa (for thickness ≤16mm) |
| Impact Toughness Requirement | Minimum impact energy 27J at 0°C | Minimum impact energy 27J at room temperature (20°C) |
| Suitable Temperature Environment | Low-temperature environment (qualified at 0°C impact) | Room temperature environment (qualified at room temperature impact) |
| Typical Application Scenarios | Structural components for cold regions, parts requiring low-temperature toughness | General building structures, mechanical manufacturing, etc. for room temperature scenarios |
In summary, the main differences lie in the impact test temperature and toughness requirements, leading to different applicable scenarios. When choosing which type of steel to use, careful consideration must be given to the specific project requirements and environmental conditions.
S275JR Hollow Section Factory
