Technical specifications for hot-rolled normalized and normalized-rolled weldable fine-grain structural steels
This specification outlines the technical delivery conditions for hot-rolled structural steels subjected to normalizing or normalizing rolling. The thermal treatment involves heating above the upper critical temperature followed by ambient air cooling, producing a uniform, fine-grained ferritic-pearlitic microstructure. This process relieves internal stresses and ensures consistent mechanical properties, primarily yield strength and ultimate tensile strength, across varying cross-sectional thicknesses. The standard specifies minimum impact energy limits at sub-zero temperatures to ensure resistance to brittle fracture. Characterized by a restricted carbon equivalent, these fine-grain steels provide high weldability.
Minimum yield strength ReH and tensile strength Rm for normalized fine-grain structural steel grades S275N/NL, S355N/NL, S420N/NL, and S460N/NL grades.
Steel Grade | t ≤ 16 mm | 16 < t ≤ 40 mm | 40 < t ≤ 63 mm | 63 < t ≤ 80 mm | 80 < t ≤ 100 mm | 100 < t ≤ 150 mm | 150 < t ≤ 200 mm | 200 < t ≤ 250 mm | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
fy (MPa) | fu (MPa) | fy (MPa) | fu (MPa) | fy (MPa) | fu (MPa) | fy (MPa) | fu (MPa) | fy (MPa) | fu (MPa) | fy (MPa) | fu (MPa) | fy (MPa) | fu (MPa) | fy (MPa) | fu (MPa) | |
| S275N | 275 | 370 | 265 | 370 | 255 | 370 | 245 | 370 | 235 | 370 | 225 | 350 | 215 | 350 | 205 | 350 |
| S275NL | 275 | 370 | 265 | 370 | 255 | 370 | 245 | 370 | 235 | 370 | 225 | 350 | 215 | 350 | 205 | 350 |
| S355N | 355 | 470 | 345 | 470 | 335 | 470 | 325 | 470 | 315 | 470 | 295 | 450 | 285 | 450 | 275 | 450 |
| S355NL | 355 | 470 | 345 | 470 | 335 | 470 | 325 | 470 | 315 | 470 | 295 | 450 | 285 | 450 | 275 | 450 |
| S420N | 420 | 520 | 400 | 520 | 390 | 520 | 370 | 520 | 360 | 520 | 340 | 500 | 330 | 500 | 320 | 500 |
| S420NL | 420 | 520 | 400 | 520 | 390 | 520 | 370 | 520 | 360 | 520 | 340 | 500 | 330 | 500 | 320 | 500 |
| S460N | 460 | 540 | 440 | 540 | 430 | 540 | 410 | 540 | 400 | 540 | 380 | 530 | 370 | 530 | 370 | 510 |
| S460NL | 460 | 540 | 440 | 540 | 430 | 540 | 410 | 540 | 400 | 540 | 380 | 530 | 370 | 530 | 370 | 510 |
Note: The properties presented on this page are based on standard specifications, which should be consulted for compliance. The information presented here is for reference purposes only.