Description
Build-to-print forged or machined component
904L Custom Flange for Corrosive Service
A 904L custom flange is a build-to-print high-alloy austenitic stainless component for corrosive equipment or piping connections after material and design review.
What is a 904L custom flange?
The flange can incorporate special drilling, facing, hubs, grooves and instrument or equipment interfaces. Product form and heat treatment must match the approved manufacturing route.
904L is a high-nickel, molybdenum-bearing grade often considered for selected acid and chloride environments. It is not a universal replacement for duplex or nickel alloys.
904L custom flange to drawing specifications
| Product | custom flange to drawing |
|---|---|
| Material | 904L / UNS N08904 / EN 1.4539 |
| Material specification | ASTM A182 F904L or project-specified product form |
| Dimensional standard | Customer drawing; ASME B16.5, ASME B16.47 or EN 1092-1 references when applicable |
| Connection / form | Drawing-defined bore, bolt pattern, facing, hub and special features |
| Size and rating | Drawing-defined dimensions, tolerance, mass and acceptance criteria |
| Surface / end detail | Surface roughness, coating, marking and edge break per drawing |
| Manufacturing route | Forging or plate route, heat treatment and CNC machining after technical review |
| Inspection documents | EN 10204 3.1 MTC, dimensional report and additional testing when specified |
Dimensions, tolerances and acceptance criteria follow the standard edition and project documents named on the purchase order. Published ranges are enquiry guidance, not a pressure-temperature design approval.
Material and dimensional standards
Material specification
UNS N08904 / EN 1.4539 is commonly called 904L. The applicable ASTM product specification depends on whether the part is forged, plate-machined or made by another approved route.
Product dimensions
A custom flange is controlled by the approved drawing. Standard references apply only to the features explicitly retained in that drawing.
Typical applications and selection boundary
Applications are examples only. Confirm corrosion resistance, temperature limits, impact properties and code compliance for the actual service.
Manufacturing, inspection and documentation
SASA FLANGE can supply this product with identification linked to the raw-material heat. The agreed inspection and documentation plan is controlled by the purchase order.
Heat-number control and material certificate review.
Drawing dimensions, GD&T features, surface finish and documented hold points.
PMI, PT, UT, hardness or third-party inspection when specified.
EN 10204 3.1 MTC and ordered inspection reports.
RFQ checklist
- Material grade and specification
- Dimensional standard and edition
- Nominal size
- Quantity and destination
- MTC, NDE and third-party inspection requirements
- Controlled drawing and revision
- Service and design code
- Tolerances, surface finish and inspection plan
Frequently asked questions
What should be included in an RFQ for a 904L custom flange?
State the material specification, dimensional standard and edition, size, pressure class or wall thickness, end or facing detail, quantity, inspection requirements and delivery destination.
Can a 904L custom flange be supplied with EN 10204 3.1 documentation?
Yes. EN 10204 3.1 material certification and heat-number traceability can be supplied. PMI, NDE, dimensional reporting or third-party inspection should be stated on the purchase order.
Is 904L suitable for every corrosive service?
No. Grade selection depends on the fluid chemistry, chloride level, temperature, pressure, fabrication route and governing design code. The project engineer should confirm service suitability.
Request a quotation
Send the standard, material, size, rating or wall thickness, quantity and inspection requirements for a technical and commercial review.
