What Is S275JR Channel Steel
S275JR channel steel is a hot-rolled U-shaped structural section manufactured to EN 10025-2, the European standard for non-alloy structural steels. With a minimum yield strength of 275 MPa, it provides higher strength than S235JR while retaining very good weldability and formability, making it suitable for load-bearing applications in construction, infrastructure, and industrial engineering.
Mechanical Properties
The minimum yield strength is 275 MPa for thicknesses up to 16 mm, 265 MPa for 16 to 40 mm, 255 MPa for 40 to 63 mm, 245 MPa for 63 to 80 mm, 235 MPa for 80 to 100 mm, 225 MPa for 100 to 150 mm, and decreasing further for heavier sections. The tensile strength is 410 to 560 MPa for most thickness ranges, with 430 to 580 MPa for sections below 3 mm. Impact toughness of 27 J at plus 20 degrees C is guaranteed by the JR quality.
Chemical Composition
Limits are carbon 0.21 to 0.22 percent depending on thickness, manganese 1.50 percent, phosphorus 0.035 percent, sulfur 0.035 percent, nitrogen 0.012 percent, and copper 0.55 percent. The controlled carbon content allows welding by standard processes without preheating for most applications.
Size and Weight Reference
Common sizes include 70 by 35 mm at 4.2 kg per meter, 100 by 50 mm at 9.56 kg per meter, 120 by 55 mm at 12.5 kg per meter, 125 by 65 mm at 13.1 kg per meter, 150 by 75 mm at 16.8 kg per meter, and 200 by 75 mm at 22.3 kg per meter, with light and medium variants available. Standard delivery forms are fixed or random lengths with black, hot-dip galvanized, or painted surfaces.
Applications
S275JR channels are used in building frameworks, columns, beams, and secondary supports; bridges and flyovers; vehicle frames, trailers, and chassis; solar panel and wind turbine support structures; storage racks and industrial platforms; and public utility structures such as lighting poles, signage supports, and water treatment plants.
Equivalent Grades
Engineering equivalents include ASTM A36 and A283 Grade C, DIN St44-2, JIS SS400, and ISO 630-2 S275B. Equivalent comparisons are for reference only, and the applicable standard governs procurement and design.
Frequently Asked Questions
Q: What is the yield strength of S275JR?
A: 275 MPa minimum for thicknesses up to 16 mm.
Q: What standard specifies S275JR?
A: EN 10025-2.
Q: What sizes are available?
A: From 70 by 35 mm up to 200 by 75 mm and larger on request.
Q: Is S275JR channel easy to weld?
A: Yes, with standard processes and no preheat for most thicknesses.
Q: What are S275JR channels used for?
A: Building frames, bridges, vehicle frames, solar supports, and storage racks.
Q: Can S275JR channels be galvanized?
A: Yes, hot-dip galvanizing suits outdoor and corrosive environments.
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