Weathering steels
Weathering steels are structural steels designed to develop a protective patina when exposed to the atmosphere. This characteristic helps limit further corrosion and makes them suitable for bridges, building facades, rail vehicles and other outdoor structures where reduced coating maintenance is desirable.
| Grade | Material no. | C | Si | P | S | Cr | Mn |
|---|---|---|---|---|---|---|---|
| SMA400AW | — | max 0.18 | 0.15 - 0.65 | max 0.035 | max 0.035 | 0.45 - 0.75 | max 1.25 |
| SMA400BP | — | max 0.18 | max 0.55 | max 0.035 | max 0.035 | 0.3 - 0.55 | max 1.25 |
| SMA490CW | — | max 0.18 | 0.15 - 0.65 | max 0.035 | max 0.035 | 0.45 - 0.75 | max 1.4 |
| SMA570W | — | max 0.18 | 0.15 - 0.65 | max 0.035 | max 0.035 | 0.45 - 0.75 | max 1.4 |
| SMA400AP | — | max 0.18 | max 0.55 | max 0.035 | max 0.035 | 0.3 - 0.55 | max 1.25 |
| SMA490BW | — | max 0.18 | 0.15 - 0.65 | max 0.035 | max 0.035 | 0.45 - 0.75 | max 1.4 |
| SMA490CP | — | max 0.18 | max 0.55 | max 0.035 | max 0.035 | 0.3 - 0.55 | max 1.4 |
| SPA-C | — | max 0.12 | 0.2 - 0.75 | 0.07 - 0.15 | max 0.035 | 0.3 - 1.25 | max 0.6 |
| SMA400CW | — | max 0.18 | 0.15 - 0.65 | max 0.035 | max 0.035 | 0.45 - 0.75 | max 1.25 |
| SMA490AW | — | max 0.18 | 0.15 - 0.65 | max 0.035 | max 0.035 | 0.45 - 0.75 | max 1.4 |
| SMA490BP | — | max 0.18 | max 0.55 | max 0.035 | max 0.035 | 0.3 - 0.55 | max 1.4 |
| SPA-H | — | max 0.12 | 0.2 - 0.75 | 0.07 - 0.15 | max 0.035 | 0.3 - 1.25 | max 0.6 |
| SMA400BW | — | max 0.18 | 0.15 - 0.65 | max 0.035 | max 0.035 | 0.45 - 0.75 | max 1.25 |
| SMA400CP | — | max 0.18 | max 0.55 | max 0.035 | max 0.035 | 0.3 - 0.55 | max 1.25 |
| SMA490AP | — | max 0.18 | max 0.55 | max 0.035 | max 0.035 | 0.3 - 0.55 | max 1.4 |
| SMA570P | — | max 0.18 | max 0.55 | max 0.035 | max 0.035 | 0.3 - 0.55 | max 1.4 |
| 9CrNiCuP324 | 1.8945 | ≤0,12 | ≤0,75 | 0,06-0,15 | 0,035 | 0,30-1,25 | ≤1,00 |
| Fe510D1KI | 1.8946 | ≤0,12 | ≤0,75 | 0,06-0,15 | 0,03 | 0,30-1,25 | ≤1,00 |
| Fe360CKI | 1.8958 | ≤0,13 | ≤0,40 | 0,035 | 0,035 | 0,40-0,80 | 0,20-0,60 |
| A709-50W | 1.8959 | ≤0,16 | ≤0,50 | 0,035 | 0,035 | 0,40-0,80 | 0,50-1,50 |
| S235JRW | 1.8960 | ≤0,13 | 0,10-0,40 | 0,05 | 0,035 | 0,50-0,80 | 0,20-0,50 |
| Fe360DKI | 1.8961 | ≤0,13 | ≤0,40 | 0,035 | 0,03 | 0,40-0,80 | 0,20-0,60 |
| 9CrNiCuP3-2-4 | 1.8962 | ≤0,12 | 0,25-0,75 | 0,07-0,15 | 0,035 | 0,50-1,25 | 0,20-0,50 |
| A600C | 1.8963 | ≤0,16 | ≤0,50 | 0,035 | 0,035 | 0,40-0,80 | 0,50-1,50 |
| S355J2W | 1.8965 | ≤0,16 | ≤0,50 | 0,03 | 0,03 | 0,40-0,80 | 0,50-1,50 |
| S355K2W(+N) | 1.8966 | ≤0,16 | ≤0,50 | 0,035 | 0,035 | 0,40-0,80 | 0,50-1,50 |
| S355K2W | 1.8967 | ≤0,16 | ≤0,50 | 0,03 | 0,03 | 0,40-0,80 | 0,50-1,50 |
Standards covering this category
19Property ranges
17| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| ReH | N/mm² | 195 | 355 | 7 |
| Rm | N/mm² | 350 | 720 | 23 |
| A80 | % | 16 | 21 | 7 |
| Re | N/mm² | 195 | 460 | 17 |
| A | % | 15 | 26 | 23 |
| A5 | % | 25 | 27 | 1 |
| KCU | kJ/m² | 640 | 690 | 1 |
| rho | g/cm³ | 7.49 | 7.87 | 11 |
| E | GPa | 165 | 211 | 1 |
| alpha | 10^-6/K | 12 | 13.85 | 1 |
| lambda | W/(m·K) | 38 | 57 | 1 |
| cp | J/(kg·K) | 486 | 703 | 1 |
| rho_el | nΩ·m | 200 | 1219 | 1 |
| Ac1 | °C | 724 | 724 | 1 |
| Ac3 | °C | 860 | 860 | 1 |
| Ar3 | °C | 830 | 830 | 1 |
| Ar1 | °C | 676 | 676 | 1 |
Derived from 23 grades in this category with a recorded value.
Composition range
15| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| C | % | 0.12 | 0.18 | 27 |
| N | % | 0.009 | 0.009 | 4 |
| Al | % | 0.02 | 0.02 | 2 |
| Si | % | 0.1 | 0.75 | 27 |
| P | % | 0.03 | 0.15 | 27 |
| S | % | 0.03 | 0.035 | 27 |
| Ti | % | 0.02 | 0.1 | 2 |
| V | % | 0.02 | 0.12 | 2 |
| Cr | % | 0.3 | 1.25 | 27 |
| Mn | % | 0.2 | 1.5 | 27 |
| Ni | % | 0.05 | 0.65 | 19 |
| Cu | % | 0.2 | 0.55 | 27 |
| Zr | % | 0.15 | 0.15 | 5 |
| Nb | % | 0.015 | 0.06 | 2 |
| Mo | % | 0.3 | 0.3 | 5 |
Derived from 27 grades in this category with a recorded value.