UB 406x178x67 S275JR/S355JR H Steel Profile
Material grade classification
S275JR h beam profile: basic low-carbon steel, yield strength ≥275MPa, suitable for medium load scenarios.
S355JR h steel profile: high-strength upgraded version, yield strength ≥355MPa, with stronger compression and deformation resistance, suitable for heavy load or dynamic load environment.
The suffix "JR" means that the material has an impact toughness of ≥27J at 20℃, which meets general engineering needs.
Processing and welding characteristics
Processability: Both materials have good cold bending, cutting and forming properties. S275JR has a lower carbon content and better plasticity, which is suitable for processing complex structural parts.
Weldability: By controlling the content of sulfur and phosphorus impurities, it is not easy to crack during welding, and it is suitable for arc welding, gas shielded welding and other processes.
Low-temperature toughness: S355JR h section beam can still maintain stable performance in low temperature environments (such as -20℃), while S355J2 (higher grade in the same series) can withstand lower temperatures.
Application scenarios and advantages
Construction field
S275JR steel h column: light factory frame, ordinary bridge support, etc.
S355JR h beam: high-rise building load-bearing structure, large industrial equipment bracket, etc.
Machinery manufacturing
Crane rails, conveying equipment frame (S275JR).
Heavy machinery chassis, tower crane support structure (S355JR).
| index | S275JR | S355JR |
|---|---|---|
| Carbon content (C) | ≤0.21% | ≤0.22% |
| Manganese content (Mn) | ≤1.50% | ≤1.60% |
| Sulfur/Phosphorus Content | ≤0.040%(S,P) | ≤0.040%(S,P) |
| Yield Strength | ≥275MPa | ≥355MPa |
| tensile strength | 430-580MPa | 470-630MPa |
| Elongation (A₅) | ≥18% | ≥20% |
