EN 10253-2 Type B buttweld pipe fittings in 1.0425 — P265GH carbon steel. A step above P235GH in minimum yield strength (265 MPa vs 235 MPa), with higher allowable stress in design calculations and service rated to 400°C. Widely used in European boiler fabrication, pressure vessels, and heat exchanger piping where higher design pressure requires the increased allowable. Common on German TÜV-approved pressure system drawings.
| Grade | W.Nr. | Min Yield (MPa) | C max | Max Temp | When to Choose |
|---|---|---|---|---|---|
| P235GH | 1.0345 | 235 | 0.16% | 300°C | General pressure piping — lowest cost |
| P265GH | 1.0425 | 265 | 0.20% | 400°C | Higher design pressure; European boiler duty |
| P295GH | 1.0566 | 295 | 0.22% | 400°C | Thicker wall / highest carbon steel allowable |
| W.Nr. | 1.0425 |
| EN Name | P265GH |
| ASTM Nearest | A234 WPB (similar) |
| Standard | EN 10253-2 Type B |
Filler: ER70S-6 or E7018. Preheat 100°C for t >20mm. PWHT at 580–620°C when required by code.
