EN 10216-2 P265GH Carbon Steel Boiler Tube Seamless Steel U Bend Tube Water Wall Tube
EN 10216-2 P265GH Carbon Steel Boiler Tube Seamless Steel U Bend Tube Square Bending
The Only Real “U‑bend” Application in a Water Wall – Roof or Floor
In a few boiler types, a 180° return bend is used, but the tube is horizontal, not vertical:
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Water‑cooled floor (fluidised bed): Tubes run horizontally, make a 180° U‑turn at the side wall, and return. These are genuine U‑bends.
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Water‑cooled roof (top of furnace): Similar horizontal serpentine with U‑bends at the roof edge.
In these cases, the tube is still called a water wall tube (because it forms part of the furnace enclosure), and EN 10216‑2 P265GH is acceptable for pressures up to ~160 bar and temperatures up to 400°C.
Key difference: These U‑bends are cold‑bent with a mandrel, stress‑relieved, and have a large centre‑line radius (≥ 2.5× OD) to avoid thinning and ovality.
Chemical Composition% of EN 10216-2 P265GH Carbon Steel Boiler Tube Seamless Steel U Bend Tube Water Wall Tube
| C | Si | Mn | P | S | Cr | Mo | Ni | Al | Cu | Nb | Ti | V | Cr+Cu+Mo+Ni |
| 0.2 | 0.4 | 1.4 | 0.025 | 0.02 | 0.03 | 0.08 | 0.3 | 0.02 | 0.3 | 0.01 | 0.04 | 0.02 | 0.7 |
Mechanical Properties of EN 10216-2 P265GH Carbon Steel Boiler Tube Seamless Steel U Bend Tube Water Wall Tube
| Grade | Steel Number | Upper yield strength or proof strength, Wall Thickness T min. | Tensile Strength Rm | Elongation A min.% | ||||
| T≤16 | 16＜T≤40 | 40＜T≤60 | 60＜T≤100 | Mpa | longitudinal | transverse | ||
| Mpa | Mpa | Mpa | Mpa | |||||
| P265GH | 1.0425 | 265 | 255 | 245 | / | 410-570 | 23 | 21 |
If you are procuring seamless P265GH U-bends (e.g., for an economizer in a waste heat boiler):
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Hot Bending: Normalized after bending (re-qualifies to P265GH).
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Cold Bending: Must be stress relieved at 580–620°C if outer fiber strain > 15% (per EN 12952).
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Thinning: Outer wall thinning cannot exceed 12–15% of nominal thickness.
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Ovality: Max 10% for pressure parts (tighter for membrane welding).
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NDT: 100% liquid penetrant (PT) on the bend extrados (outer curve).
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Superheater
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Economizer, industrial boilers
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Power plant steam lines (subcritical)
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Heat exchangers in refineries and chemical plants
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Pressure vessels for elevated temperature service
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