S275JR AR vs. S355J2N

Attribute	S275JR AR	S355J2N
Material Type	S275JR AR	S355J2N
Yield Strength	275 MPa	355 MPa
Tensile Strength	410-560 MPa	470-630 MPa
Impact Energy	27 J at -20°C	27 J at -20°C

Introduction

When it comes to structural steel, two common grades that are often compared are S275JR AR and S355J2N. Both of these grades are widely used in various industries for their excellent mechanical properties and suitability for different applications. In this article, we will compare the attributes of S275JR AR and S355J2N to help you understand the differences between these two grades.

Chemical Composition

One of the key differences between S275JR AR and S355J2N lies in their chemical composition. S275JR AR is a carbon steel with a maximum carbon content of 0.24%, while S355J2N is a higher strength steel with a maximum carbon content of 0.22%. Additionally, S355J2N contains higher levels of manganese, silicon, and phosphorus compared to S275JR AR. These differences in chemical composition result in varying mechanical properties for each grade.

Mechanical Properties

When it comes to mechanical properties, S355J2N has higher strength and better impact resistance compared to S275JR AR. The minimum yield strength of S275JR AR is 275 MPa, while S355J2N has a minimum yield strength of 355 MPa. This higher strength makes S355J2N suitable for applications that require greater load-bearing capacity and structural integrity. Additionally, S355J2N has a higher impact energy value, making it more suitable for structures subjected to dynamic loads.

Weldability

Another important factor to consider when comparing S275JR AR and S355J2N is their weldability. S275JR AR is known for its good weldability, making it easier to weld and fabricate compared to S355J2N. On the other hand, S355J2N requires preheating before welding to prevent cracking and achieve proper weld quality. This difference in weldability can impact the ease of fabrication and construction processes for each grade.

Corrosion Resistance

Corrosion resistance is another aspect to consider when choosing between S275JR AR and S355J2N. S275JR AR has moderate corrosion resistance due to its lower alloy content, making it suitable for indoor applications or environments with low corrosion risk. In contrast, S355J2N has better corrosion resistance due to its higher alloy content, making it more suitable for outdoor applications or environments with higher corrosion risk. It is important to consider the intended use and exposure conditions when selecting the appropriate grade for a specific application.

Applications

Both S275JR AR and S355J2N are commonly used in various industries for structural applications. S275JR AR is often used in building construction, bridges, and machinery due to its good weldability and moderate strength. On the other hand, S355J2N is preferred for applications that require higher strength and better impact resistance, such as offshore structures, heavy machinery, and high-rise buildings. The choice between these two grades depends on the specific requirements of the project and the desired performance characteristics.

Conclusion

In conclusion, S275JR AR and S355J2N are two popular grades of structural steel with distinct attributes that make them suitable for different applications. While S275JR AR offers good weldability and moderate strength, S355J2N provides higher strength, better impact resistance, and improved corrosion resistance. The choice between these two grades depends on the specific requirements of the project, including mechanical properties, weldability, corrosion resistance, and intended application. By understanding the differences between S275JR AR and S355J2N, you can make an informed decision when selecting the appropriate grade for your project.