ASME SA336 F11 CL2 Chrome-Moly Tube Side Flange | OD 597mm * ID 381mm * THK 110mm – Forged Heat Exchanger Flange for High-Temperature & High-Pressure Service
Yuhong Group: Complete Heat Exchanger Components – From Tubes to Flanges
Yuhong Group Co., Ltd. designs and manufactures a comprehensive range of thermal equipment for global industries. Our core offerings include shell and tube heat exchangers, pressure vessels, air coolers, and a complete supply of critical components: finned tube bundles, U-tube bundles, heat exchanger tubesheets, and all related parts – including forged flanges for pressure-containing connections. Our full-service approach ensures you get exactly what you need for new projects or maintenance.
Shown in the attached photographs is one of our ASME SA336 F11 CL2 chrome-moly tube side flanges – a forged component precision-machined for high-temperature and high-pressure heat exchanger service.
Product Focus: Tube Side Flange – The Critical Connection for Tube-Side Fluid
The tube side flange is a critical pressure-retaining component that connects the channel (bonnet) to the shell or tubesheet, allowing tube-side fluid to enter and exit the heat exchanger. It provides the bolted connection that enables access to the tube bundle for inspection, cleaning, and maintenance.
Based on the images, this flange exhibits:
| Property | Benefit for Flange Application |
|---|---|
| 1.25Cr-0.5Mo alloy | Provides excellent high-temperature strength and creep resistance up to ~550°C. |
| Class 2 temper | Offers higher strength than Class 1 – suitable for elevated pressure services. |
| Forged construction | Uniform grain structure; no internal voids or laminations – critical for pressure-retaining components. |
| ASME compliance | Fully traceable to ASME Section II material specifications. |
| Hydrogen service capability | Chrome-moly alloys are widely used in hydrogen-rich environments (refining, petrochemical). |
| Heat number traceability | Each flange is stamped with heat number for full material traceability. |
| Component | Material (Typical) | How It Interfaces with the Flange |
|---|---|---|
| Channel / Bonnet | Carbon steel or chrome-moly | Welded or bolted to the flange – flange connects channel to the shell/tubesheet. |
| Gasket | Spiral-wound, metal-jacketed, or RTJ | Seals between the flange and mating component – prevents leakage. |
| Stud Bolts & Nuts | SA193 B16 / SA194 4 or B7/2H | Pass through bolt holes; clamp the flange to the mating component. |
| Heat Exchanger Tubesheet | Chrome-moly or stainless steel | Located adjacent to the flange – flange provides access to the tubesheet face. |
| Heat Exchanger Tube | Chrome-moly, stainless steel, or alloy | Not directly connected – but accessible through the flanged opening. |
| U-Tube Bundle | Chrome-moly or stainless steel | The flange provides access to the U-tube bundle inside the channel. |
| Flange Type | Location in Heat Exchanger | Function |
|---|---|---|
| Tube Side Flange (shown here) | Between channel and shell/tubesheet | Connects the channel to the shell; allows tube-side fluid to enter/exit. |
| Channel Cover Flange | End of the channel | Closes the channel end; allows access for tube-side inspection. |
| Shell Flange | On the shell body | Connects shell sections or provides access to shell-side internals. |
| Nozzle Flange | On inlet/outlet nozzles | Connects process piping to the heat exchanger. |
The flange shown in your photograph is a tube side flange – it connects the channel (bonnet) to the shell or tubesheet, providing the entry/exit point for tube-side fluid.
| Parameter | Value / Description |
|---|---|
| UNS number | K11572 |
| Nominal composition | 1.25% Cr, 0.5% Mo |
| Tensile strength (min) | ~515 MPa (Class 2) |
| Yield strength (min) | ~310 MPa (Class 2) |
| Max continuous service temp | ~550°C |
| Typical applications | Refinery exchangers, hydrogen coolers, high-pressure steam generators, reactor effluent coolers |
| ASME code | ASME Section II, Part A – SA-336/SA-336M |
When to specify F11 CL2 for tube side flanges:
To avoid mismatches, we need the following information (send any of these):
Common errors to avoid when ordering tube side flanges:
If you need just parts (not a full exchanger), we supply:
| Industry | Application | Why F11 CL2 |
|---|---|---|
| Petrochemical refineries | Hydrogen coolers, reactor effluent exchangers | High-temperature hydrogen service; resists H₂ attack. |
| Power generation | High-pressure steam heaters | Chrome-moly retains strength at 400-550°C. |
| Chemical processing | High-temperature acid / solvent heaters | Withstands thermal cycling and corrosive environments. |
| Oil & gas | Gas processing at elevated temperatures | Reliable in high-pressure, high-temperature gas service. |
Every F11 tube side flange we ship includes:
To quote a tube side flange like the one in your photographs, send the following to jimmy@steelseamlesspipe.com:
We will respond with a dimensional drawing for approval, price, and delivery schedule – typically within 48 hours.
