5052 Aluminum Weld Neck Flanges,– Slip-On, Blind
We manufacture 5052 aluminum flanges for marine equipment, chemical-processing systems, heat exchangers, storage tanks and lightweight industrial piping.
Our main product range includes:
- 5052 aluminum slip-on flanges
- 5052 aluminum blind flanges
- 5052 aluminum plate flanges
- 5052 weld neck flanges
- Drawing-specific aluminum flanges
- O-ring and special-facing flanges
Standard 5052 plate flanges are normally machined from ASTM B209 Aluminum Alloy 5052 sheet or plate. Flange dimensions can follow ASME B16.5 dimensional patterns, EN 1092-4 or approved customer drawings.
The applicable pressure rating must be confirmed according to the material temper, flange geometry, design pressure, temperature, gasket, bolting and governing piping code.
5052 Aluminum Flange Specifications
| Item | Available Specification |
|---|---|
| Material | Aluminum Alloy 5052 |
| UNS designation | A95052 |
| Common tempers | O, H32 or project-specified temper |
| Raw material standard | ASTM B209 / ASME SB-209 |
| Flange types | Slip-on, blind, plate and weld neck |
| Dimensions | ASME B16.5 EN 1092-4 or approved drawing |
| Facing | Flat face, raised face, O-ring groove or custom |
| Manufacturing method | Forging CNC turning, drilling and machining |
| Inspection | Visual and dimensional inspection, PT when specified |
| Documentation | Material certificate, inspection report and certificate of conformity |
| Country of origin | China |
What Is Aluminum Alloy 5052?
5052 aluminum is a non-heat-treatable aluminum-magnesium alloy containing magnesium as its principal alloying element, with a controlled chromium addition.
The alloy develops increased strength through cold working rather than solution heat treatment and artificial aging. It offers good forming characteristics, weldability, fatigue resistance and corrosion resistance, particularly in saltwater and humid environments. It is commonly supplied in sheet, plate and tube forms.
Typical Chemical Composition
| Element | Content, wt.% |
|---|---|
| Silicon, Si | Maximum 0.25 |
| Iron, Fe | Maximum 0.40 |
| Copper, Cu | Maximum 0.10 |
| Manganese, Mn | Maximum 0.10 |
| Magnesium, Mg | 2.20–2.80 |
| Chromium, Cr | 0.15–0.35 |
| Zinc, Zn | Maximum 0.10 |
| Other elements, each | Maximum 0.05 |
| Other elements, total | Maximum 0.15 |
| Aluminum, Al | Remainder |
Final chemical acceptance must follow the material specification and edition stated in the purchase order. The Aluminum Association’s Teal Sheets are the defining source for registered wrought aluminum alloy designations and chemical-composition limits.
5052 Aluminum Slip-On Flanges
A 5052 aluminum slip-on flange has a bore larger than the connecting pipe outside diameter. The pipe is inserted through the flange and normally joined by fillet welding.
Slip-on flanges can be manufactured with:
- Flat face
- Raised face
- Hubbed construction
- Plate-type construction
- ASME bolt-hole pattern
- PN bolt-hole pattern
- Custom bore and bolt circle
The inquiry should state the actual pipe outside diameter and wall thickness so that the flange bore and weld arrangement can be correctly machined.
5052 Aluminum Blind Flanges
A 5052 aluminum blind flange is used to close the end of a pipe, vessel nozzle, valve or equipment connection.
Blind flanges are well suited to plate machining because they do not require an integral forged hub. Available designs include:
- Flat-face blind flange
- Raised-face blind flange
- O-ring groove blind flange
- Inspection-port cover flange
- Manway or equipment cover
- Custom drilled blind plate
The required flange thickness should be established by the selected standard or an approved engineering calculation.
5052 Weld Neck Flanges
A weld neck flange normally includes an integral tapered hub that transfers piping loads into the flange body.
However, ASTM B247-25 does not list UNS A95052 among its covered forging alloys. The current alloy list includes grades such as 1100, 3003, 5083 and 6061, but not 5052. Therefore, a 5052 weld neck flange should not be advertised as an ASTM B247 5052 forging.
Custom 5052 weld neck flanges may be considered when:
- The customer provides an approved drawing.
- The raw-material form and temper are clearly defined.
- The manufacturing route is accepted by the project engineer.
- The pressure design is independently verified.
- Welding and inspection requirements are specified.
For a standard one-piece forged weld neck flange, consider our 6061-T6 Aluminum Flanges or a project-approved ASTM B247 5083 flange.
ASTM B209 Aluminum Plate
ASTM B209 covers aluminum and aluminum-alloy flat sheet, coiled sheet and plate in specified alloys and tempers. It is the appropriate raw-material framework for plate-machined 5052 slip-on, blind and flat flanges.
Common 5052 plate tempers include:
- 5052-O for higher formability
- 5052-H32 for increased strength with good formability
- Other project-specified H tempers
The exact temper should be selected according to the machining, welding, strength and forming requirements of the flange.
ASME B16.5 Dimensional
ASME B16.5 covers pressure-temperature ratings, materials, dimensions, tolerances, marking and testing for pipe flanges and flanged fittings from NPS 1/2 through NPS 24. It also limits standard flange construction to specified cast, forged or plate product forms.
A 5052 flange may be machined to an ASME B16.5:
- Outside diameter
- Bolt-circle diameter
- Bolt-hole arrangement
- Bore
- Facing geometry
- Overall thickness pattern
However, dimensional compatibility does not automatically give a 5052 flange the same pressure-temperature rating as a steel or listed forged-material flange.
A technically correct description is:
Aluminum Alloy 5052-H32 Plate Flange manufactured from ASTM B209 plate, with dimensions based on ASME B16.5 and pressure rating verified by the project designer.
EN 1092-4 Aluminum Flanges
EN 1092-1 applies to steel flanges and should not be used as the main product standard for 5052 aluminum flanges.
The appropriate European dimensional framework for aluminum-alloy flanges is EN 1092-4. It covers PN-designated aluminum-alloy flanges from DN15 to DN600 and PN10 to PN63, including flange types, facings, dimensions, tolerances, bolting, marking and material requirements.
The selected 5052 material and temper must still be checked against the adopted standard edition or approved by the project engineer.
Standard Comparison
| Standard | Correct Application |
|---|---|
| ASTM B209 / ASME SB-209 | 5052 sheet and plate used to machine flanges |
| ASTM B247 / ASME SB-247 | Forgings and rolled rings in listed alloys; 5052 is not listed |
| ASME B16.5 | NPS flange dimensions and joint configuration |
| EN 1092-4 | PN-designated aluminum-alloy flanges |
| EN 1092-1 | Steel flanges, not aluminum flanges |
Application
5052 aluminum flanges may be considered for:
- Marine equipment
- Shipbuilding components
- Heat exchangers
- Chemical tanks
- Fuel and oil systems
- Hydraulic equipment
- Food-processing equipment
- Lightweight fabricated piping
- Industrial machinery
- Electrical and electronic equipment
Final suitability must be confirmed against the actual medium, temperature, pressure, fatigue loading, galvanic-corrosion risk and applicable design code.
Related Aluminum Products
| Recommended Product | Suitable Requirement |
|---|---|
| 6061-T6 Aluminum Flanges | ASTM B247 forged weld neck, slip-on and blind flanges |
| 5083 Aluminum Pipe Fittings | Marine elbows, tees and reducers |
| 90 Degree 5083 Aluminum Elbow | LR and SR marine aluminum elbows |
| ASTM B361 Aluminum Pipe Fittings | Aluminum butt-weld fitting requirements |
| Aluminum Alloy 5083 Flanges | Marine and cryogenic material selection |
Frequently Asked Questions
Does ASTM B247 cover Aluminum Alloy 5052?
No. The current ASTM B247 alloy list does not include UNS A95052. A flange should therefore not be described as an ASTM B247 5052 forging.
Which standard covers 5052 plate flanges?
ASTM B209 / ASME SB-209 is commonly used for the 5052 sheet or plate from which slip-on, blind and plate flanges are machined.
Can 5052 flanges use ASME B16.5 dimensions?
Yes. They can be machined to ASME B16.5 dimensional patterns, but the allowable pressure-temperature rating must be separately confirmed.
Is EN 1092-1 applicable to aluminum flanges?
No. EN 1092-1 applies to steel flanges. EN 1092-4 is the corresponding standard for PN-designated aluminum-alloy flanges.
What is the difference between 5052 and 6061 aluminum flanges?
5052 is a non-heat-treatable sheet and plate alloy with good forming and corrosion resistance. 6061 is heat treatable and is available as an ASTM B247 forging, making it generally more suitable for one-piece forged weld neck flanges.
5052 Aluminum Flange Manufacturer in China
We manufacture 5052 aluminum slip-on flanges, blind flanges, plate flanges and customized flange componentsaccording to customer drawings and project requirements.
Products can be supplied with material traceability, dimensional inspection, NDT and export documentation according to the agreed inspection plan.
