Refinery heater and furnace coils

Tubing for fired heaters, crackers and reformers

Fired heater coils fail from the outside in: oxidation, sulphidic attack and carburisation long before pressure becomes the issue. Material selection climbs the chromium and nickel ladder with the tube metal temperature.

RefiningPetrochemicalPower GenerationFertiliserOil & Gas

[ 02 ] Selection

How we choose the material for this duty.

Moderate temperature convection sections: A335 P11 / P12 / P22
Sulphidic and naphthenic attack: A335 P5 or P9 (5Cr and 9Cr)
High temperature radiant sections: A335 P91 or austenitic 310S / 321
Steam reformer pigtails and outlet sections: Alloy 800HT
Extreme duty and AUSC service: Alloy 617 and 740H

Grades we would specify.

A335 P22 Seamless Pipe

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ASTM / ASME A335 / SA335 Grade P22EN 10CrMo9-10 / 1.7380

2.25Cr-1Mo seamless pipe — the main steam and hot reheat standard. P22 carries creep strength and hydrogen resistance across refinery hot wall piping, superheater headers and heater coils, and is the pipe most often paired with SA387 Grade 22 vessels.

0 forms available

A335 P9 Seamless Pipe

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ASTM / ASME A335 / SA335 Grade P9EN X11CrMo9-1 / 1.7386

9Cr-1Mo seamless pipe. Higher chromium for oxidation and sulphidic corrosion resistance in refinery heater coils and high temperature transfer lines.

0 forms available

A335 P91 Seamless Pipe

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ASTM / ASME A335 / SA335 Grade P91EN X10CrMoVNb9-1 / 1.4903

Modified 9Cr-1Mo-V (P91) seamless pipe for supercritical steam. The creep strength allows a much thinner wall than P22 at 580 - 600 C, cutting weight and thermal fatigue on main steam and hot reheat lines. Hardness after PWHT is reported on every length.

0 forms available

310S Stainless Steel

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UNS S31008EN 1.4845 / X8CrNi25-21

The high-temperature austenitic. 25Cr-20Ni gives scaling resistance to around 1035 C in continuous service, so 310S is the grade for furnace internals, radiant tubes and anything that lives in flue gas rather than in water.

0 forms available

Alloy 800HT (Incoloy 800HT)

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UNS N08811EN 1.4959 / X8NiCrAlTi32-21

The creep-optimised version of Alloy 800. Controlled carbon plus a combined aluminium and titanium window of 0.85 - 1.20% gives far better creep rupture strength above 600 C, so 800HT is the grade for the hottest reformer and pigtail service rather than plain 800.

0 forms available

Alloy 617

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UNS N06617EN 2.4663 / NiCr23Co12Mo

Nickel-chromium-cobalt-molybdenum alloy for the extreme end of high temperature service. Solid solution strengthening keeps useful creep strength to 1100 C while the chromium and aluminium give oxidation resistance, so 617 is used where 800HT and stainless are long past their limit.

0 forms available

Products that go with it.

Heat Exchanger Tubes

Shell and tube bundles supplied to the TEMA sheet

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Boiler Tubes

Water wall, superheater and reheater tubing

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Questions buyers ask about this duty.

P9 or P91 for a heater coil?

P9 is chosen for sulphidic corrosion resistance at moderate strength; P91 is chosen for creep strength and allows a thinner wall at high temperature. If the limiting factor is sulphur attack, go P9; if it is creep at 550 - 600 C, go P91.

Where does Alloy 800HT take over from stainless?

Above roughly 850 - 900 C metal temperature and in carburising atmospheres, where austenitic stainless loses creep strength and starts to carburise. 800HT holds creep strength and resists carburisation, which is why reformer pigtails and outlet manifolds use it.

Related applications

Cement chute and silo liners HPGR roller re-studding Crusher and screen wear parts Mining haul bodies and buckets Bulk handling chutes and silos Seawater cooling and firewater lines

Send the duty, not just the grade.

Tell us the service conditions, the current material and what life you are getting. Our Dubai desk comes back with the grade, the thickness and what is in stock.

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