Why Choose S355JR Angle Steel
S355JR is the most widely used high-strength structural grade in Europe, defined in EN 10025-2 with a minimum yield strength of 355 MPa up to 16 mm thickness. Compared with S235JR or S275JR, an S355JR angle carries about 30 to 50 percent more load for the same section, which reduces member sizes, bolted joints and overall steel tonnage.
For lifting equipment and construction machinery, the strength saving translates directly into lighter structures, lower fabrication cost and easier handling on site.
Mechanical Properties
Minimum yield: 355 MPa up to 16 mm, 345 MPa for 16 to 40 mm.
Tensile strength: 470 to 630 MPa.
Impact energy: 27 J at 20 degrees Celsius for the JR suffix.
Weldability: good, with a low carbon equivalent suitable for standard welding processes.
Angles in Beams and Lifting Equipment
Angles are used as flange members and web diagonals of welded plate girders, as bracing of crane booms and gantry frames, and as stiffeners in lifting beams. The L-section is easy to weld into trusses and lattice structures, and its flat legs give clean seating for bolts and pins. In lifting equipment, S355JR angles keep dead weight low while resisting fatigue in repeated load cycles.
Size Range
S355JR angles are rolled as equal and unequal sections from 20 x 20 x 3 mm to 200 x 200 x 24 mm and 200 x 100 mm respectively. Sections above 100 mm leg width are usually supplied with a controlled rolling condition to guarantee the through-thickness properties required by the design.
Construction Applications
In construction projects, S355JR angles are used for roof trusses, tower members, bracing systems, stair stringers, crane rail supports and heavy brackets. The grade is accepted in bridges, industrial buildings and offshore-adjacent structures where higher strength reduces member sizes and simplifies connections.
Quality and Testing
Angles are tested per heat for yield, tensile and impact properties, with EN 10204 type 3.1 certificates. Dimensional checks cover leg width, thickness, straightness and twist. For lifting equipment, additional non-destructive testing of welds and material traceability are required by the applicable machinery rules.
Frequently Asked Questions
Q: What is the advantage of S355JR over S275JR for lifting equipment?
S355JR provides 355 MPa yield instead of 275 MPa, allowing lighter members for the same load and lower dead weight of the equipment.
Q: Can S355JR angles be welded to mild steel parts?
Yes, S355JR welds to S235 and S275 grades with standard consumables, and the joint is designed for the lower grade.
Q: Are S355JR angles available in unequal leg form?
Yes, unequal angles are rolled in the same grade.
Q: What certificates are needed for lifting equipment steel?
Material certificates with full traceability, weld inspection records and, where required, ultrasonic or magnetic particle test reports.
Q: Does the JR suffix affect strength?
No, JR refers to the impact class at 20 degrees Celsius. For lower temperatures, J0 or J2 suffixes are specified.