316L Stainless Steel Forged Flanges
Forged 316L flanges are quoted as ASTM A182 piping interfaces by type, NPS, ASME B16.5 or B16.47 class, facing and bore. Send the flange type with those order details; we quote the matching pipe and gasket system.
Supply routes
- Qualified partner-mill sourcing
- Stock coordination
Where this product solves the job
- Chemical, pharmaceutical, marine and process piping where 316L corrosion margin and a defined pressure class are required.
- Weld-neck, slip-on, blind, socket-weld or threaded connections matched to an approved piping class.
- Projects that need forged-material records, machined facing control and heat-linked inspection documents.
When we recommend another route
- A generic flange request that omits class, facing, bore, NPS, grade or dimensional standard.
- Replacing a duplex or high-alloy flange without reviewing temperature, chloride exposure, toughness and welding.
- Treating Class 150 through 2500 as a universal availability promise rather than a standard range to confirm for each quote.
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
- State F316L or the approved 316L material designation, ASTM A182 edition and ASME B16.5 or B16.47 basis.
- Identify nominal size, pressure class, flange type, facing, bore or pipe schedule, bolt-hole pattern and drawing revision.
- Define solution heat treatment, hardness, tensile or impact requirements, PMI, NDE, dimensional report and witness points.
- Confirm threaded or socket-weld details, ring groove dimensions, weld-neck bore and any corrosion or cleaning requirements.
- Give quantity by item, marking, heat traceability, inspection document, facing protection, packing and destination.
Specifications
| Material | F316L / F316 as ordered |
|---|---|
| Types | Weld neck, slip-on, blind, socket weld and threaded |
| Dimensions | ASME B16.5 or B16.47 as applicable |
| Pressure class | State 150, 300, 600, 900, 1500 or 2500 with NPS and flange type |
| Facing | Raised face, flat face or ring-type joint |
| Bore | Match pipe schedule or drawing |
| Inspection | Tests required by the purchased standard plus PMI, NDE or other checks 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 product standard.
- PMI, NDE, corrosion, roughness or other supplementary inspection 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 flange interface
Send 316L with NPS, pressure class, type, facing, bore and dimensional standard. We quote ASTM A182/A182M forged material against ASME B16.5 or B16.47 dimensions and ratings, checked to the pipe, gasket and bolt system.
Quote weld-neck bores to the pipe schedule
Send schedule or bore drawing, face type, weld-end detail and any internal transition. Blind, threaded and socket-weld flanges are quoted as separate installation routes.
Quote heat treatment and face protection
Send the required heat-treatment, mechanical, PMI, NDE and dimensional methods with the RFQ. We keep heat and lot identity through machining and protect faces and grooves in export packing.
Common ordering mistakes
- Naming a pressure class but forgetting the facing or bore that must mate with the pipe and gasket.
- Selecting a weld-neck flange without stating pipe schedule and bore transition.
- Mixing ASME B16.5 and B16.47 ranges or assuming their bolt circles are interchangeable.
- Requesting a forged route and a test report without defining the material standard, acceptance criteria or heat linkage.
Handling and transport risks
- Raised faces and ring grooves can be scored by stacking or hard contact during machining and transport.
- Threaded and socket-weld details can collect debris, so protected ends and clean handling need to be stated.
- Mixed heat numbers or loose pieces can separate the flange from its heat-treatment and inspection records.
- Salt, moisture and carbon-steel contact can stain 316L surfaces before installation.
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
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
- 316L, 316; 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 product standard.; PMI, NDE, corrosion, roughness or other supplementary inspection 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 F316L forged weld-neck flanges, ASME B16.5 Class 600, NPS 4, raised face, bore to Schedule 40S, solution-treated, dimensional report and PMI with any NDE listed in the requisition, heat-linked inspection document, protected face and export case packing to destination port; we quote the matching route and delivery window.
Frequently Asked Questions
What six details define a 316L forged flange order?
State material grade and standard, NPS, pressure class, flange type, facing, bore or schedule, then add heat treatment, inspection and packing requirements. A nominal size and class without the interface details are incomplete.
When should I choose a weld-neck instead of a slip-on flange?
The piping class, cyclic service, bore transition, fabrication procedure and design authority decide the interface. A weld-neck needs the mating pipe schedule and bore; a slip-on has a different fit-up and calculation basis.
Do ASME B16.5 and B16.47 cover the same flange range?
No. Their dimensional and size coverage differ. State the applicable standard for the NPS and class, and verify bolt circle, facing and bore against the project piping class.
What inspection records can be requested for forged 316L flanges?
The accepted plan may include heat-treatment, mechanical, hardness, PMI, NDE, dimensional or third-party witness records. Name the method and acceptance basis before production so the document package can be confirmed.
How should flange faces be protected in export packing?
Use protection appropriate to raised faces, ring grooves or machined bores, separate heavy pieces, keep marks visible and confirm cases, skids and moisture control for the transport route. Packing is part of the order, not an assumed default.
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.