ASME SA336 F11 Class2 Alloy Steel Tubesheet For Heat Exchangers F1 F12 F22 F21 F5 F9
ASME SA336 F11 Class2 Alloy Steel Tubesheet For Heat Exchangers F1 F12 F22 F21 F5 F9
ASME SA336 F11 CL2 high-temperature alloy steel tubesheets are core pressure-bearing components of shell-and-tube heat exchangers designed for extreme high-temperature, high-pressure, and hydrogen-corrosive environments.
Made from chromium-molybdenum alloy steel forgings (1.0-1.5% Cr, 0.44-0.65% Mo), heat-treated to ensure high strength and toughness even at temperatures ≤595°C.
This material resists high-temperature hydrogen corrosion and is suitable for demanding applications such as hydrogenation reactors, nuclear steam generators, and thermal power plant high-pressure feedwater heaters. Compared to carbon steel tubesheets, its high-temperature strength retention is 40% higher, and controlled hardness effectively suppresses wet H₂S stress corrosion cracking.
Typical applications include refinery 15MPa-rated reaction effluent heat exchangers, thermal power plant feedwater systems subject to temperature swings exceeding 150°C, and waste heat boilers in ammonia synthesis plants.
SA336 Grade F11 Class 2 Chemical Element Content (%)
| Composition | C | Si | Mn | P | S | Cr | Mo |
| Minimum | 0.1 | 0.5 | 0.3 | - | - | 1 | 0.45 |
| Maximum | 0.2 | 1 | 0.8 | 0.025 | 0.025 | 1.5 | 0.65 |
SA336 Grade F11 Class 2 Mechanical Properties
|
Tensile Strength
|
Yield Point
|
Elongation or Elongation
|
Reduction of Area
|
| 485~660 | ≥275 | ≥20 | ≥40 |
Application
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