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Machined alloy flanges with raised faces and bolt holes

Alloy flanges and fittings

Stainless Steel 347 Flanges Manufacturer & Exporter

This Stainless Steel 347 commercial page is for flange requirements where a niobium-stabilized austenitic stainless grade is specified for the project. Define F347 material identity, flange form, NPS or DN, pressure class, facing, bore, dimensional edition, thermal and welding context, inspection, certification, quantity, and export destination.

Technical snapshot

Key details for your specification.

Material identity

Stainless Steel 347 / ASTM A182 Grade F347

Material standard

ASTM A182 / ASME SA182 with ordered grade and condition retained

Product definition

Weld neck, blind, slip-on, socket weld, threaded, lap joint, or drawing form

Inspection

Certificate chemistry, traceability, dimensions, PMI plan, and TPI where required

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 347 | 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.

F347 is a distinct stabilized-grade requirement

Type 347 uses niobium stabilization and is selected in some projects where welding and elevated-temperature exposure are important. It should not be grouped casually with 321, 316L, or generic stainless because the material designation, stabilization approach, certificate chemistry, and project approvals differ.

Thermal context belongs beside pressure class

A pressure class alone does not establish service suitability. Provide the design and operating temperatures, pressure, medium, cycle conditions, flange joint design, bolting, gasket system, and applicable piping code so material and dimensional requirements can be reviewed together.

Certificate review is central to grade confirmation

The release dossier should let the buyer reconcile the ordered F347 grade with heat number, chemistry, mechanical results, heat treatment, dimensions, marking, and inspection. PMI can support identity control, while the MTC and traceability record carry the broader conformance evidence.

Standards and release

Define the basis, then document it.

ASTM A182 / ASME SA182

Specify Grade F347 and review chemistry, mechanical acceptance, heat treatment, marking, and certificate evidence against the ordered edition.

ASME B16.5 / project drawing

Select flange form, NPS, class, facing, bore, tolerances, and dimensional route separately from the alloy designation.

Technical acceptance

Welding, thermal exposure, corrosion medium, and any stabilization or heat-treatment criteria must follow the project material specification.

Applications and next steps

Connect the requirement to the right workflow.

Refinery thermal-process piping reviews

Chemical equipment flange connections

Heat-exchanger and heater piping interfaces

Specified stabilized-stainless replacements

Stainless Steel Flanges overviewReview the authoritative stainless steel flanges product-family route.Stainless Steel 321 FlangesCompare the separate titanium-stabilized commercial route.High-Temperature ApplicationsReview thermal, pressure, corrosion, and inspection considerations.Material Traceability GuideConnect the ordered grade to heat records and marking.Request Technical QuotationSend the F347 flange schedule and project acceptance basis.

Buyer questions

Frequently asked questions.

What makes F347 different from a generic stainless flange?

F347 is a separately designated niobium-stabilized austenitic stainless grade with its own ordered chemistry, treatment, and acceptance requirements.

Are F347 and F321 interchangeable?

No automatic interchange should be assumed. The project engineer and purchaser must approve any substitution after reviewing service, welding, code, and material requirements.

Is PMI sufficient to release F347 flanges?

PMI is only part of identity control. Release should also reconcile the MTC, heat traceability, ordered grade, heat treatment, dimensions, marking, and project inspection plan.

Which commercial inputs are essential for F347 flanges?

Provide form, size, class, facing, bore, standards and editions, quantity, service and welding context, inspection, documents, packing, 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.

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Technical quotation desk

Have a Technical Requirement?

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

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