ASME SA336 F5 tubesheet is a forged chromium-molybdenum alloy steel component manufactured for shell and tube heat exchangers, pressure vessels, and associated high-temperature equipment.
The product is manufactured from ASME SA336 Grade F5 alloy steel forging and machined according to the heat exchanger engineering drawing. Depending on the equipment design, the tubesheet may include tube holes, bolt holes, gasket grooves, pass partitions, sealing surfaces, and other customized machined features.
ASME SA336/A336M covers ferritic alloy steel forgings for pressure and high-temperature parts, including components used in boilers, pressure vessels, and associated equipment. Grade F5 is one of the alloy steel grades covered by the specification.
Material Standard: ASME SA336 / ASTM A336
Material Grade: F5
Material Type: Chromium-Molybdenum Alloy Steel
Product Type: Forged Heat Exchanger Tubesheet
Manufacturing: Forging + Heat Treatment + CNC Machining
SA336 F5 is generally identified as a 5Cr-0.5Mo class alloy steel, with chromium and molybdenum specified as the principal alloying elements. Published composition data for the current SA336 Grade F5 designation lists chromium at 4.0–6.0% and molybdenum at 0.45–0.65%.
The alloy composition of SA336 F5 makes it suitable for pressure and elevated-temperature equipment where a chrome-moly forged material is specified by the equipment design.
Typical specified chemical ranges include:
| Element | Typical SA336 F5 Requirement |
|---|---|
| Carbon (C) | ≤ 0.15% |
| Manganese (Mn) | 0.30–0.60% |
| Silicon (Si) | ≤ 0.50% |
| Chromium (Cr) | 4.00–6.00% |
| Molybdenum (Mo) | 0.45–0.65% |
| Phosphorus (P) | ≤ 0.025% |
| Sulfur (S) | ≤ 0.025% |
The final chemical requirements should be controlled according to the applicable edition of ASME SA336 and the project specification.
The tubesheet is a major structural component in a shell and tube heat exchanger.
It provides the interface between the heat exchanger shell, tube bundle, and tube-side components. Tube holes are machined according to parameters such as:
Common tube layouts may include:
The final layout is manufactured according to the approved heat exchanger drawing.
Depending on the exchanger configuration, the tubesheet may also function as part of the pressure boundary separating shell-side and tube-side fluids.
Additional machining can include:
The geometry should be determined according to the equipment design rather than a standard piping flange dimension.
SA336 F5 alloy steel is forged into a tubesheet blank with sufficient machining allowance.
Forging is particularly suitable for customized pressure equipment components requiring large diameters, substantial thicknesses, or complex final machining.
ASME A336/A336M specifies heat treatment requirements for alloy steel forgings. Depending on the grade and applicable specification requirements, forgings may be supplied in conditions such as:
The final heat treatment route should follow the applicable material specification, component dimensions, and purchase requirements.
After heat treatment, the forged blank is machined according to the heat exchanger drawing.
Typical machining operations include:
Tube holes can be manufactured according to the specified:
For expanded tube connections, the tube hole surface condition and dimensional tolerance can be controlled according to the specified tube-to-tubesheet joint design.
Where strength welding or seal welding is specified, the tube hole configuration can be machined to suit the welding procedure and heat exchanger design.
| Item | Specification |
|---|---|
| Product Name | ASME SA336 F5 Forged Alloy Steel Tubesheet |
| Material Standard | ASME SA336 / ASTM A336 |
| Material Grade | F5 |
| Material Type | Chromium-Molybdenum Alloy Steel |
| Product Type | Heat Exchanger Tubesheet |
| Manufacturing | Forged & CNC Machined |
| Heat Treatment | According to ASME SA336 and Project Requirements |
| Application | Heat Exchanger and Pressure Equipment |
ASME SA336 F5 tubesheets are normally manufactured according to customer drawings.
| Parameter | Specification |
|---|---|
| Outside Diameter | Customized |
| Thickness | Customized |
| Tube Hole Diameter | According to Tube OD |
| Tube Pitch | According to Drawing |
| Tube Hole Layout | Triangular / Square / Customized |
| Number of Tube Holes | According to Drawing |
| Bolt Holes | Customized |
| Gasket Groove | Customized |
| Pass Partition | According to Design |
ASME SA336 F5 forged tubesheets can be manufactured for shell and tube heat exchangers where chromium-molybdenum alloy steel is specified for the pressure component.
Typical equipment includes:
Chrome-moly alloy steel forgings are commonly associated with pressure and high-temperature equipment. The suitability of F5 for a particular process medium should be determined according to the operating temperature, pressure, corrosion conditions, and equipment design.
Potential applications may include:
The material standard also covers alloy steel forgings for boilers, pressure vessels, and associated high-temperature equipment.
Applications may therefore include components designed for:
Inspection may include:
Key inspection items can include:
Depending on project requirements, the tubesheet can be supplied with:
ASME A336/A336M also provides supplementary requirements for additional testing or inspection when individually specified by the purchaser.
