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Finished weld neck alloy flanges arranged for product review

Alloy flanges and fittings

Stainless Steel 321 Flanges Manufacturer & Exporter

Raymond Tube Industries provides a commercial enquiry route for Stainless Steel 321 flanges where titanium-stabilized austenitic stainless is named by the project. Buyers should include the F321 material standard, flange form, class, facing, bore, operating and fabrication context, inspection plan, MTC requirements, quantity, packing, and destination.

Technical snapshot

Key details for your specification.

Material identity

Stainless Steel 321 / ASTM A182 Grade F321

Material standard

ASTM A182 / ASME SA182 with grade and heat-treatment condition verified

Product definition

Flange form, size, class, facing, bore, and project dimensional edition

Inspection

MTC, traceability, PMI strategy, dimensions, and project-specific examination

Controlled size architecture

Flange size and configuration matrix

NPS 1/2 through NPS 24 under ASME B16.5. Standard dimensions are shown for specification planning; availability, manufacturing route, and delivery are confirmed against the final RFQ specification.

Final RFQ confirmation

Class / schedule scope

Classes 150, 300, 400, 600, 900 and 1500. Class 2500 requires the applicable NPS and current governing table to be checked.

Facing / end scope

RF / RTJ as applicable

ASME B16.5 flanges nominal size and configuration guide
Nominal sizeDNProductStandardRFQ review
1/2"DN 15FlangeASME B16.5Final RFQ
3/4"DN 20FlangeASME B16.5Final RFQ
1"DN 25FlangeASME B16.5Final RFQ
1-1/4"DN 32FlangeASME B16.5Final RFQ
1-1/2"DN 40FlangeASME B16.5Final RFQ
2"DN 50FlangeASME B16.5Final RFQ
2-1/2"DN 65FlangeASME B16.5Final RFQ
3"DN 80FlangeASME B16.5Final RFQ
4"DN 100FlangeASME B16.5Final RFQ
5"DN 125FlangeASME B16.5Final RFQ
6"DN 150FlangeASME B16.5Final RFQ
8"DN 200FlangeASME B16.5Final RFQ
10"DN 250FlangeASME B16.5Final RFQ
12"DN 300FlangeASME B16.5Final RFQ
14"DN 350FlangeASME B16.5Final RFQ
16"DN 400FlangeASME B16.5Final RFQ
18"DN 450FlangeASME B16.5Final RFQ
20"DN 500FlangeASME B16.5Final RFQ
22"DN 550FlangeASME B16.5Final RFQ
24"DN 600FlangeASME B16.5Final RFQ

This table records nominal standard scope, not a promise that every type, class, facing, bore, or material combination is available.

Use the RFQ selector to state product form, NPS / DN, class or schedule, facing or end connection, testing, and documents for review.

Controlled size architecture

Flange size and configuration matrix

NPS 26 through NPS 60 under ASME B16.47. Standard dimensions are shown for specification planning; availability, manufacturing route, and delivery are confirmed against the final RFQ specification.

Final RFQ confirmation

Class / schedule scope

Series and class require technical review

Facing / end scope

Facing / drawing review

ASME B16.47 large-diameter flanges nominal size and configuration guide
Nominal sizeDNProductStandardRFQ review
26"DN 650Large-diameter flangeASME B16.47Final RFQ
28"DN 700Large-diameter flangeASME B16.47Final RFQ
30"DN 750Large-diameter flangeASME B16.47Final RFQ
32"DN 800Large-diameter flangeASME B16.47Final RFQ
34"DN 850Large-diameter flangeASME B16.47Final RFQ
36"DN 900Large-diameter flangeASME B16.47Final RFQ
38"DN 950Large-diameter flangeASME B16.47Final RFQ
40"DN 1000Large-diameter flangeASME B16.47Final RFQ
42"DN 1050Large-diameter flangeASME B16.47Final RFQ
44"DN 1100Large-diameter flangeASME B16.47Final RFQ
46"DN 1150Large-diameter flangeASME B16.47Final RFQ
48"DN 1200Large-diameter flangeASME B16.47Final RFQ
50"DN 1250Large-diameter flangeASME B16.47Final RFQ
52"DN 1300Large-diameter flangeASME B16.47Final RFQ
54"DN 1350Large-diameter flangeASME B16.47Final RFQ
56"DN 1400Large-diameter flangeASME B16.47Final RFQ
58"DN 1450Large-diameter flangeASME B16.47Final RFQ
60"DN 1500Large-diameter flangeASME B16.47Final RFQ

RTI large-diameter availability is not published. Use the technical quotation flow with the current dimensional standard and drawing.

Use the RFQ selector to state product form, NPS / DN, class or schedule, facing or end connection, testing, and documents for review.

Controlled size selector

Configure this alloy requirement.

Use the controlled NPS / DN conversion, then pass size, class or schedule, facing or end connection, and quantity to the RFQ.

Final RFQ confirmation

Selected requirement

Stainless Steel 321 | Weld Neck Flange | 6" / DN 150 | Class 600 | RTJ

ASME B16.5. Availability, manufacturing route, and delivery are confirmed against the final RFQ specification.

View technical detailsRequest Technical Quotation

Engineering discussion

Context before component selection.

Stabilization is part of the material-selection logic

Type 321 is a titanium-stabilized austenitic stainless grade. Its use is commonly considered where fabrication and elevated-temperature exposure make sensitization behavior relevant, but the actual temperature range, time at temperature, weld procedure, and corrosive medium must be evaluated by the project authority.

The heat-treatment and product-form route must agree

An F321 flange request should connect the material standard, forging route, heat-treatment condition, dimensions, and MTC. Substituting another stabilized grade or an unstabilized grade may affect project acceptance and should not be done from commercial convenience alone.

PMI planning needs awareness of grade verification limits

PMI can support alloy identification, but a complete F321 release also depends on the ordered standard, certificate chemistry, heat traceability, material condition, dimensions, marking, and project inspection plan. State any verification method or laboratory requirement explicitly.

Standards and release

Define the basis, then document it.

ASTM A182 / ASME SA182

Order Grade F321 explicitly and verify the delivered material condition and certificate against the project requirement for the forged flange.

ASME B16.5 / drawing

Define the dimensional route independently of material selection, including class, flange form, facing, bore, gasket interface, and any non-standard drawing.

Fabrication review

Temperature cycling, welding, post-fabrication treatment, and service exposure remain engineering inputs; the grade name alone is not a service approval.

Applications and next steps

Connect the requirement to the right workflow.

High-temperature process piping reviews

Thermal cycling and fabricated equipment connections

Refinery and petrochemical piping classes

Project-specific replacement flanges

Stainless Steel Flanges overviewReview the authoritative stainless steel flanges product-family route.Stainless Steel MaterialsCompare stabilized, low-carbon, and higher-alloy stainless grades.High-Temperature ApplicationsReview temperature, pressure, fabrication, and procurement questions.EN 10204 3.1 GuideUnderstand certificate identity and acceptance evidence.Request Technical QuotationSend the F321 flange and service specification.

Buyer questions

Frequently asked questions.

Why is Stainless Steel 321 described as stabilized?

It is a titanium-stabilized austenitic stainless grade. Final suitability still depends on fabrication, temperature exposure, medium, and the project specification.

Can F321 be replaced with F347 in a flange order?

Not without engineering and purchaser approval. They are separately designated stabilized grades and the order, MTC, and project material list must remain aligned.

Does this page give a maximum service temperature for F321 flanges?

No. Temperature limits depend on the governing design code, stress basis, material condition, process environment, and project criteria and must be verified for the application.

What should an F321 flange RFQ contain?

State grade, material standard, flange form, NPS or DN, class, facing, bore, dimensional edition, service and fabrication context, inspection, documents, quantity, and destination.

Technical quotation

Turn this guidance into a controlled request.

Capture the material, product form, dimensions, standard, inspection, documentation, packing, and destination requirements for review.

Submit Technical RFQEmail Export Desk

Technical quotation desk

Have a Technical Requirement?

Send us your material grade, size, class or schedule, quantity, and specification.

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