2205 Duplex Stainless Steel Pipe
2205 duplex stainless steel pipe is quoted as seamless or welded ASTM A790 pipe in UNS S32205 or the project-approved duplex designation, by NPS and schedule or OD and wall. Common inquiry range: NPS 1/2–24, Sch 10S / 40S / 80S, 6 m or cut-to-length, plain or beveled ends, with heat treatment, tests and heat traceability in the same order file.
Supply routes
- Qualified partner-mill sourcing
- Stock coordination
Grade datasheets:2205
Where this product solves the job
- Desalination, water-treatment and process piping where 2205 is approved for the chloride, temperature and operating conditions.
- Offshore or chemical piping classes that specify UNS S32205, ASTM A790 construction and the supplementary test plan.
- Duplex piping that uses the higher strength of 2205 with a coordinated wall, welding procedure and component package.
When we recommend another route
- 316L substitution based only on nominal strength or corrosion language.
- Fabrication without qualified duplex welding, heat-input, cleaning and inspection controls.
- Orders that omit the UNS designation, seamless or welded route, heat treatment or phase-sensitive test plan.
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 A790/A790M · ASME B36.19M
What to send so we can quote the right route
- Specify UNS S32205 or the exact project-approved designation, ASTM A790 edition and any tighter chemistry or project requirement.
- State seamless or welded construction and define NPS with schedule, or OD and wall where the specification permits it.
- Confirm solution heat-treatment requirements, permitted repair route and any ferrite or detrimental-phase acceptance method.
- Define standard tests and each supplementary PMI, corrosion, impact or NDE requirement by lot scope and acceptance criteria.
- Give length, plain or beveled ends, marking, heat traceability, ordered document type and compatible export protection.
Specifications
| Grade | 2205 / UNS S32205 |
|---|---|
| Product standard | ASTM A790/A790M |
| Product route | Seamless or welded, quoted separately |
| Dimensions | Common inquiry range: NPS 1/2–24, or OD × wall |
| Schedule | 10S, 40S, 80S, plus other walls named in the RFQ |
| Heat treatment | Solution annealed and rapid cooled to ASTM A790 |
| Testing | ASTM A790 standard tests plus ferrite, G48, PMI or NDE named in the RFQ |
| Documents | EN 10204 3.1 or the inspection document named in the RFQ |
| Ends | Plain, beveled or project-specific |
| Commercial basis | Quantity, MOQ, production route and delivery schedule are quoted for the ordered specification. |
Dimensions and Tolerances
| Length | Common inquiry range: 6 m standard, random or cut-to-length. |
|---|---|
| Outer Diameter | Common inquiry range: NPS 1/2–24, or OD × wall where the specification permits it. |
| Schedule | Common inquiry range: 10S, 40S, 80S, plus other ASME B36.19 walls named in the RFQ. |
| 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
- Plain or beveled to the project detail; cut-to-length as ordered.
Testing and inspection
- ASTM A790 standard tests for the ordered seamless or welded construction.
- PMI, ferrite or phase balance, ASTM G48, impact 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
- Pipe ends capped, bundles strapped and covered for sea freight.
- Thin-wall or prepared ends cased when the ordered finish needs it; packing method stated in the quotation.
Quote the complete pipe route
2205 duplex pipe is quoted as seamless or welded ASTM A790 product in UNS S32205 or the project-approved designation. Common inquiry range is NPS 1/2–24, Sch 10S / 40S / 80S, 6 m or cut-to-length, plain or beveled ends. Send the designation, construction, tests and documents; we quote the matching supply route.
Duplex controls we quote
Chemistry, heat treatment and cooling set the duplex phase condition required by ASTM A790. When the piping class needs ferrite or phase balance, send the method, location and acceptance range. When it needs ASTM G48, send method, temperature, duration and specimen condition. PMI and NDE follow the same rule. We include those checks in the quotation.
Quote the piping class together
Quote 2205 pipe with matching flanges, fittings, bolting and filler metal. We price one piping class: grade, NPS/schedule, ends, heat treatment, tests and documents in the same order file. Heat linkage is aligned in the quotation, not assumed from this page.
Use the pipe schedule chart and weight calculator to size the inquiry, then send the known values. Grade context is on the 2205 datasheet.
Common ordering mistakes
- Treating UNS S31803 and UNS S32205 as interchangeable without checking the purchase specification and material record.
- Requesting an ASTM G48 test without naming method, temperature, duration, specimen condition and acceptance criterion.
- Comparing welded and seamless offers without aligning dimensions, heat treatment, NDE, repair and document scope.
- Ordering pipe independently from fittings, flanges, filler metal and bolting, creating a mismatched piping-class package.
Handling and transport risks
- Carbon-steel contact can contaminate duplex surfaces and complicate cleaning or later corrosion assessment.
- End damage or ovality can disrupt alignment and increase heat input during site welding of prepared joints.
- Mixed heat markings can break the linkage between phase-sensitive test records and installed pipe lengths.
- Moisture or chloride-bearing debris trapped under covers can create avoidable surface contamination during storage and shipment.
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 A790/A790M · ASME B36.19M
Finishes and processing
Stainless Steel Cut-to-Length and LevelingStainless Steel Polishing and Surface Finishing
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 A790/A790M, ASME B36.19M. State the exact ordered combination.
- Dimensions and tolerances
- Provide length, outer diameter, schedule and identify which order basis, special tolerances requirements govern acceptance.
- Finish, processing and edge or end condition
- ; Stainless Steel Cut-to-Length and Leveling, Stainless Steel Polishing and Surface Finishing; Plain or beveled to the project detail; cut-to-length as ordered..
- Inspection, documents and packing
- Testing: ASTM A790 standard tests for the ordered seamless or welded construction.; PMI, ferrite or phase balance, ASTM G48, impact 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: Pipe ends capped, bundles strapped and covered for sea freight.; Thin-wall or prepared ends cased when the ordered finish needs it; 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 A790/A790M UNS S32205 welded duplex pipe, NPS 4 Schedule 10S, solution heat-treated condition to the named edition, 6 m fixed lengths with stated tolerance, beveled ends to the project detail, standard tests plus the separately defined ferrite, PMI and ASTM G48 method and acceptance plan, ordered inspection document with heat traceability, end protection and export bundles; we quote the matching route and delivery window.
Frequently Asked Questions
Should a 2205 pipe order name UNS S31803 or UNS S32205?
Send UNS S32205 or S31803 exactly as the project specifies. We quote chemistry, heat treatment, test results and marking against that designation.
How can a buyer specify phase-related verification for duplex pipe?
Send the required method, sampling location and frequency, specimen condition, acceptance range and report. We quote ferrite measurement or metallographic review against the project specification.
Is ASTM G48 testing mandatory for every ASTM A790 pipe order?
Not automatically. When the project requires it, send the method, test temperature, exposure time, specimen preparation, acceptance criterion and lot scope; we include them in the quotation.
What changes when welded and seamless 2205 pipe are compared?
Send the same UNS grade, dimensions, heat treatment, standard edition, NDE, corrosion or phase tests, repair rules and documents. We quote welded and seamless as separate commercial routes.
Why should fittings and flanges be reviewed with the pipe RFQ?
Send fittings, flanges, bolting and welding consumables with the pipe RFQ. We quote the matching 2205 package so grade, pressure class, bore, ends, heat treatment, tests and documents stay in one order file.
Quote request
Get a Stainless Steel Quote
Send the product, grade and quantity you already have. We will complete the specification and quote the supply route.