Microalloyed steels
Microalloyed steels are low-carbon structural steels strengthened and refined by small additions of elements such as titanium, niobium or aluminium. Their measured carbon contents are up to 0.1 percent, with yield strengths from 235 to 355 N/mm², making them suitable for load-bearing fabricated components where strength, toughness and weldability are required.
| Grade | Material no. | C | Al | Si | P | S | Ti |
|---|---|---|---|---|---|---|---|
| H 240 LA | 1.0480 | ≤0,10 | ≥0,015 | ≤0,50 | 0,025 | 0,025 | ≤0,15 |
| H 280 LA | 1.0489 | ≤0,10 | ≥0,015 | ≤0,50 | 0,025 | 0,025 | ≤0,15 |
| H 320 LA | 1.0548 | ≤0,10 | ≥0,015 | ≤0,50 | 0,025 | 0,025 | ≤0,15 |
| H 360LA | 1.0550 | ≤0,10 | ≥0,015 | ≤0,50 | 0,025 | 0,025 | ≤0,15 |
| H 400 LA | 1.0556 | ≤0,10 | ≥0,015 | ≤0,50 | 0,025 | 0,025 | ≤0,15 |
Standards covering this category
6Property ranges
4| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| Rm | N/mm² | 390 | 590 | 5 |
| Re | N/mm² | 235 | 355 | 5 |
| A | % | 17 | 31 | 5 |
| rho | g/cm³ | 7.85 | 7.85 | 5 |
Derived from 5 grades in this category with a recorded value.
Composition range
8| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| C | % | 0.1 | 0.1 | 5 |
| Al | % | 0.015 | 0.015 | 5 |
| Si | % | 0.5 | 0.5 | 5 |
| P | % | 0.025 | 0.025 | 5 |
| S | % | 0.025 | 0.025 | 5 |
| Ti | % | 0.15 | 0.15 | 5 |
| Mn | % | 0.6 | 1.6 | 5 |
| Nb | % | 0.09 | 0.09 | 4 |
Derived from 5 grades in this category with a recorded value.