EN 10216-2 P235GH TC1 Carbon Steel Boiler Tube J-Tube Seamless Boiler Tube Watertube
EN 10216-2 P235GH TC1 Carbon Steel Boiler Tube J-Tube Seamless Boiler Tube Watertube
This is a seamless carbon steel tube, manufactured according to EN 10216-2 standard, made from P235GH grade material, delivered in TC1 (normalized) heat treatment condition, and bent into a "J" shape (a long straight leg with a 180° return bend at the bottom). It is installed as a water-carrying element in boilers – typically forming the bottom turn of a furnace wall or an evaporator loop – where it allows water to flow down, turn 180°, rise, and absorb heat to generate steam. The J-shape eliminates extra headers, reduces welds, and accommodates thermal expansion.
Chemical Composition of EN 10216-2 P235GH TC1 Carbon Steel Boiler Tube J-Tube
| C | Si | Mn | P | S | Mo | Ni | Cr | Cur | Others |
| max 0.16 | max 0.35 | max 1.20 | 0.025 | 0.01 | max 0.08 | max 0.30 | max 0.30 | max 0.30 |
V max 0.02 Ti max 0.04 ; Al min 0.020 |
Mechanical Properties of EN 10216-2 P235GH TC1 Carbon Steel Boiler Tube J-Tube
| Pipe types | Steel grades | Mechanical properties during tensile testing in room temperature | Resilience | ||||||||||
| EN 10216-2 P235GH, P265GH |
Upper yield limit or yield strength Re or R0,2 for wall thickness of t min | Tensile strength Rm | Elongation A min% |
Minimum energy average absorbed KVJ at the temperature of 0°C | |||||||||
| T<=16 | 16 |
40 |
60 |
I | T | ||||||||
| MPa | MPa | MPa | MPa | MPa | I | t | 20 | 0 | -10 | 20 | 0 | ||
| EN P235GH | 235 | 225 | 215 | - | 360- 500 | 25 | 23 | - | 40 | 28 | - | 27 | |
| EN P265GH | 265 | 255 | 245 | - | 410- 570 | 23 | 21 | - | 40 | 28 | - | 27 | |
Comparison with Similar Grades
| Grade | Standard | Key Difference |
|---|---|---|
| ASTM A192 | Boiler Tubes | Low carbon, moderate strength, seamless |
| ASTM A106 Gr. B | Pipe for High Temp | Similar chemistry but for piping (larger sizes) |
| ASTM A179 | Heat Exchanger Tubes | Cold drawn, lower carbon, tighter tolerances |
| ASTM A210 Gr. A1 | Boiler Tubes | Higher carbon, higher strength |
| EN 10216-2 P235GH | European Standard | Comparable pressure vessel grade |
Installation and Fabrication Notes (How It Is Used by the Boiler Maker)
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The J‑tube is typically supplied pre-bent to the boiler manufacturer’s drawing (radius, leg lengths, orientation).
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Straight ends are beveled for butt welding to headers, drums, or other tubes.
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Multiple J‑tubes are often arranged in a panel (membrane wall) by welding a steel strip between adjacent tubes.
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Before installation, each tube is hydrostatically tested (per EN 10216-2) to ensure no leaks.
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In service, the tube is part of a natural circulation loop – no external pump on that tube (except in forced-circulation designs).
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Industrial watertube boilers (e.g., in refineries, chemical plants, power stations) – used as floor tubes or furnace arch tubes.
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HRSG boilers – J-tubes in the evaporator section.
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Biomass/waste-to-energy boilers – waterwalls where corrosion resistance of P235GH is adequate.
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Marine boilers (auxiliary or main).
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