S275JR is a grade of carbon sheet steel that conforms to the EN10025 standard. It has a nominal thickness of 3mm. Here are some properties and uses of hot-rolled S275JR structural steel:
1. Properties:
- Tensile Strength: S275JR has a minimum yield strength of 275 MPa and a minimum tensile strength of 410-560 MPa.
- Elongation: It has a minimum elongation of 23% for thicknesses up to 3mm.
- Impact Resistance: S275JR has excellent impact resistance, making it suitable for applications where dynamic loads are involved.
- Weldability: It has good weldability, allowing for easy fabrication and joining of structural components.
- Corrosion Resistance: S275JR carbon steel is not corrosion resistant and should be protected against rust and other forms of corrosion.
2. Uses:
- Structural Applications: S275JR is commonly used in the construction industry for various structural components, such as beams, columns, and trusses. It provides good strength and stability to the structures.
- Machinery and Equipment: Due to its high tensile strength and impact resistance, S275JR is also used in the manufacturing of machinery and equipment, such as cranes, excavators, and agricultural machinery.
- Infrastructure Projects: S275JR steel is utilized in infrastructure projects like bridges, highways, and railway tracks due to its load-bearing capabilities and durability.
- Automotive Industry: It can be found in the automotive industry for manufacturing components that require high strength, such as chassis frames and suspension systems.
- General Fabrication: S275JR is used in general fabrication processes where steel components need to be formed, cut, and welded for various applications.
It is important to note that S275JR is not suitable for applications that require high corrosion resistance or high temperatures. In those cases, stainless or heat-resistant steels should be used.
S275JR Details:
| Deoxidation method | FN=Do not allow boiling steel |
| C THK≤16mm | ≤0.21% |
| C THK 6-40mm | ≤0.21% |
| C THK＞40mm | ≤0.22% |
| Mn | ≤1.50% |
| P | ≤0.035% |
| S | ≤0.035% |
| N | ≤0.012% |
| Cu | ≤0.55% |
| Minimum yield strength THK≤16mm | 275Mpa |
| Minimum yield strength THK 16-40mm | 265Mpa |
| Minimum yield strength THK 40-100mm | 255Mpa |
| Tensile strength | 430-580Mpa |
| Rate of elongation | 15%-23% |
| Longitudinal impact requirement | 20℃ 27J |
FAQ of S275JR
Q: What is the difference between S275JR and S275J2?
A: S275JR and S275J2 are both grades of carbon steel that conform to the EN10025 standard. The main difference between the two is in their yield strength. S275JR has a minimum yield strength of 275 MPa, while S275J2 has a minimum yield strength of 355 MPa. This means that S275J2 has higher strength and is suitable for applications requiring higher load-bearing capacity.
Q: What is the maximum thickness of S275JR carbon sheet steel?
A: The maximum thickness of S275JR carbon sheet steel can vary depending on the manufacturing process and specific requirements. However, according to the EN10025 standard, the maximum thickness for S275JR is typically 400mm.
Q: Is S275JR carbon steel suitable for welding?
A: Yes, S275JR carbon steel has good weldability. It can be easily welded using common welding methods such as arc welding, MIG welding, and TIG welding. However, it is important to follow proper welding procedures and use appropriate filler materials to ensure the integrity of the weld joint.
Q: Can S275JR carbon steel be heat treated?
A: S275JR is not recommended for heat treatment as it is a low carbon steel. It is generally supplied in its as-rolled condition, and any heat treatment can negatively affect its mechanical properties.
Q: What are the equivalent grades of S275JR carbon steel in other standards?
A: S275JR is equivalent to ASTM A36 in the United States, DIN ST44-2 in Germany, and BS 43B in the United Kingdom. These equivalent grades have similar chemical compositions and mechanical properties to S275JR.
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