1.0473 is P355GH: the highest-strength non-alloy steel in EN 10028-2, the European standard for pressure-purpose steels with specified elevated-temperature properties. It is supplied normalised (+N) and is used for heavier-wall pressure parts where P265GH (1.0425) is not strong enough. P355GH is not one of the grades listed in EN 10253-2, so P355GH fittings are made to order from EN 10028-2 material, with Type B dimensions by agreement.
"P" marks a steel for pressure purposes; 355 is the minimum yield strength in MPa for the thinnest thickness range. The minimum falls as wall thickness increases.
"H" means elevated-temperature properties are specified, as for P235GH (1.0345) and P265GH (1.0425). P355GH is the strongest grade in that series.
| Element | Limit (%) |
|---|---|
| Carbon (C) | 0.10–0.22 |
| Silicon (Si) | ≤0.60 |
| Manganese (Mn) | 1.10–1.70 |
| Phosphorus (P) | ≤0.025 |
| Sulphur (S) | ≤0.010 |
| Aluminium (Al total) | ≥0.020 |
| Cr / Ni / Mo | ≤0.30 / ≤0.30 / ≤0.08 |
| W.Nr. | 1.0473 |
| EN Name | P355GH |
| Condition | Normalised (+N) |
| Material standard | EN 10028-2 |
| Fittings | Made to order; not listed in EN 10253-2 |
C-Mn filler such as ER70S-6 or E7018. Set preheat from the carbon equivalent and wall thickness, for example to EN 1011-2.
