2205 Duplex Stainless Steel Flanges
2205 duplex flanges are quoted as ASTM A182 F51 or F60 forgings by NPS, ASME B16.5 or B16.47 class, facing and bore. Send the exact designation, not a generic 2205 flange name; we quote the matching pipe class.
Supply routes
- Qualified partner-mill sourcing
Grade datasheets:2205
Where this product solves the job
- Chloride, offshore, water-treatment and chemical lines where duplex strength and corrosion resistance are part of the design basis.
- Weld-neck, slip-on, blind or project-specific flanges matched to a defined NPS, class, facing and pipe schedule.
- Orders with an agreed solution-treatment and duplex phase or corrosion verification plan.
When we recommend another route
- A generic "2205 flange" request that omits F51 or F60, UNS designation, pressure class and facing.
- Substitution for austenitic 316L without checking temperature, toughness, welding and corrosion design requirements.
- A project that needs a flange standard or bore not covered by the selected ASME dimensional range.
Standards we quote against
Send the product standard, edition and any dimensional or finish standard with the RFQ. We quote the ordered combination, not a generic grade name.
Ordered product standards: ASTM A182/A182M · ASME B16.5 · ASME B16.47
What to send so we can quote the right route
- Name ASTM A182 grade and UNS basis, such as F51 or F60, plus the material and dimensional standard editions.
- State NPS, pressure class, flange type, facing, bore or pipe schedule, outside diameter and any drawing-specific dimensions.
- Define solution heat treatment, cooling, ferrite or phase balance, impact, hardness, corrosion, PMI and NDE requirements.
- Identify marking, heat and lot traceability, inspection document, third-party witness points and project approval requirements.
- Give quantity by size, gasket and bolt interface constraints, packing, destination and requested delivery window.
Specifications
| Material | F51 / UNS S31803 or F60 / UNS S32205 as ordered |
|---|---|
| Types | Weld neck, slip-on, blind and project-specific |
| Dimensions | ASME B16.5 or B16.47 as applicable |
| Pressure class | State class with NPS and flange type |
| Heat treatment | Solution treated to material standard |
| Testing | Tests required by the purchased standard plus PMI, NDE or other checks named in the RFQ |
| Documents | EN 10204 3.1 or the inspection document named in the RFQ |
| Commercial basis | Quantity, MOQ, production route and delivery schedule are quoted for the ordered specification. |
Dimensions and Tolerances
| Other | Common inquiry range: NPS with ASME B16.5 or B16.47 class, facing and bore or matching pipe schedule. |
|---|---|
| Order basis | Governing product and dimensional standard, delivery condition and any drawing-specific limits. |
| Special tolerances | Send special tolerances in the RFQ; we quote the accepted production route. |
Published ranges are technical references, not a live-stock or production-capability promise. We confirm the ordered size range, MOQ and delivery schedule in the quotation.
Edge or end condition
- Edge, end or facing condition as ordered from the product form, standard and fabrication need.
Testing and inspection
- Tests required by the purchased forging standard.
- PMI, ferrite or phase balance, impact, hardness, corrosion or NDE quoted when the RFQ names method, lot scope and acceptance.
Order documents
- Heat identity with EN 10204 3.1, or the inspection document named in the RFQ, against mill, stock or partner-mill route.
- Supplementary reports linked to the ordered test plan.
Export packaging
- Machined gasket faces fitted with rigid protectors; pieces identified by class, facing and bore.
- Heavy flanges packed on skids or in cases matched to unit weight; packing method stated in the quotation.
Quote the duplex grade precisely
Send F51 or F60 as the ordered ASTM A182 grade with the UNS designation and standard edition. Both are 2205-type duplex, but chemistry requirements differ. We quote the flange against the pipe grade, gasket, bolts and project approval list.
Quote class, facing and bore together
Send NPS, weld-neck or slip-on type, raised face or ring-type joint, bore, schedule and bolt-hole pattern with pressure class. We quote the matching pipe and gasket system.
Quote duplex verification with heat treatment
Send ferrite or phase checks, impact, corrosion testing, hardness, PMI or NDE with method and acceptance. We keep heat numbers, records and item marking linked through machining, inspection and export packing.
Common ordering mistakes
- Using F51 and F60 as synonyms without confirming chemistry, UNS designation and the governing purchase standard.
- Selecting a pressure class but omitting facing, bore, pipe schedule or the matching gasket and bolt system.
- Requiring duplex phase or corrosion tests only after forging and heat treatment have been completed.
- Treating a flange as interchangeable with another grade because the nominal dimensions look similar.
Handling and transport risks
- Mixed heat numbers or loose marking can break the link between flange, heat treatment and duplex test record.
- Machined facings and ring grooves can be damaged by hard separators, impact or unprotected stacking.
- Salt, wet packing and carbon-steel contact can stain the surface before installation even when the alloy is correct.
- Heavy flanges require lifting and case packing that protect facing flatness and bolt-hole geometry.
Technical content updated: 2026-07-31
Published by Tsingshan (Shandong) Iron & Steel Co., Ltd..Sources, update policy and technical limitations.
Typical Applications
Related technical resources
Grades
Published standards
Applicable standards
ASTM A182/A182M · ASME B16.5 · ASME B16.47
Finishes and processing
What to Include in Your RFQ
Send the known values first. We use them to quote the ordered option, inspection plan and delivery route.
- Grade and governing standard
- 2205; ASTM A182/A182M, ASME B16.5, ASME B16.47. State the exact ordered combination.
- Dimensions and tolerances
- Provide other and identify which order basis, special tolerances requirements govern acceptance.
- Finish, processing and edge or end condition
- ; state any additional processing; Edge, end or facing condition as ordered from the product form, standard and fabrication need..
- Inspection, documents and packing
- Testing: Tests required by the purchased forging standard.; PMI, ferrite or phase balance, impact, hardness, corrosion or NDE quoted when the RFQ names method, lot scope and acceptance. Documents: Heat identity with EN 10204 3.1, or the inspection document named in the RFQ, against mill, stock or partner-mill route.; Supplementary reports linked to the ordered test plan. Packing: Machined gasket faces fitted with rigid protectors; pieces identified by class, facing and bore.; Heavy flanges packed on skids or in cases matched to unit weight; packing method stated in the quotation.
- Quantity, destination and requested delivery window
- Send quantity per size, unit, destination city or port, trade term and requested delivery window so we can quote the supply and freight route.
Product RFQ Example
RFQ example: ASTM A182 F51 duplex weld-neck flanges, ASME B16.5 Class 300, NPS 8, raised face, bore to Schedule 40S, solution-treated, PMI and duplex phase verification plus any NDE listed in the requisition, heat-linked inspection document, protected facing, export case packing and destination port; we quote the matching route and delivery window.
Frequently Asked Questions
Are ASTM A182 F51 and F60 duplex flange grades interchangeable?
No. They reference different UNS and chemistry requirements even when both are described as 2205-type duplex. State the exact grade, standard edition and project approval basis in the RFQ.
Which flange inputs are needed besides NPS and pressure class?
Include flange type, facing, bore or pipe schedule, dimensional standard, material grade, bolt-hole details and any drawing-specific dimensions. The gasket and mating pipe class should be checked at the same time.
What duplex verification can be requested for 2205 flanges?
The accepted plan may include solution-treatment records, ferrite or phase balance, impact, hardness, PMI, corrosion testing or NDE. Name the method and acceptance basis before forging; the supplier confirms the final package in the quotation.
Can a 2205 flange replace 316L without a design review?
No. Strength and corrosion behavior do not alone establish interchangeability. Review temperature, toughness, welding, gasket, bolt, corrosion and code requirements before selecting a different alloy family.
How should heavy duplex flanges be packed for export?
Protect raised faces or grooves, separate machined surfaces, keep heat and item marks legible and select skids, cases and moisture control for weight and transport route. Packing details belong in the accepted order.
Quote request
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Send the product, grade and quantity you already have. We will complete the specification and quote the supply route.