ASTM A182 F316 Slip On Flanges — Marine Grade SS 316 Manufacturer
Tesco Steel & Engineering forges ASTM A182 F316 slip on flanges — stainless steel 316 (UNS S31600), the molybdenum-bearing “marine grade” whose 2–3% Mo addition resists the chloride pitting that limits 304 — to ASME B16.5 Class 150–2500 from ½″ to 24″ NB, larger patterns to order. The corrosion-resistant flange of coastal plants, chloride-bearing process lines, pharma and food duty, serviceable cryogenic to +538 °C, supplied solution annealed and commonly dual-certified 316/316L, with 316L and 316H variants and 304 from the same forge. Ready stock in common sizes; every lot with EN 10204 3.1/3.2 MTC. ISO 9001:2015, made in Mumbai, India — exported to 50+ countries.
ASTM A182 F316 · SA182 · S3160016Cr-12Ni-2Mo · 1.4401 · SUS 316ASME B16.5 Class 150–2500½″ – 24″ NB · SORFCryogenic to +538 °CReady Stock · Dual 316/316LEN 10204 3.1 / 3.2 · ISO 9001:2015
ASTM A182 F316 Stainless Steel Slip On Flange — Raised Face (SORF)
What is an ASTM A182 F316 Slip On Flange?
F316 = 304 plus molybdenum.ASTM A182 F316 (UNS S31600) takes the austenitic base and adds 2–3% molybdenum, strengthening the passive film against chloride pitting and crevice corrosion — the “marine grade” of coastal air, brackish water and chloride-bearing process streams. Same austenitic virtues as 304: cryogenic to +538 °C, no brittle transition. As a slip-on, it installs with two fillet welds, E316L consumables, no preheat, no PWHT.
Also searched as: SS 316 slip on flange, 316 SORF flange, marine grade slip on flange, SA182 F316 slip on flange, SUS 316 flange, 1.4401 slip on flange, S31600 slip on flange — all refer to the product on this page.
Rule of thumb: the stainless ladder is climbed by chloride exposure — 304 for low, 316 for coastal and chloride-adjacent, duplex for brine and immersion, super duplex and 6-moly for hot seawater.
ASTM A182 F316 (UNS S31600) Chemical Composition
C
Mn
Si
P
S
Cr
Ni
Mo
Fe
0.08 max
2.00 max
1.00 max
0.045 max
0.030 max
16.0-18.0
10.0-14.0
2.00-3.00
Bal
Values in weight % per ASTM A182 for UNS S31600. The molybdenum is the element the grade exists for — it strengthens the passive film against chloride attack, lifting the PREN to roughly 24-26 — while the higher nickel holds the austenite with chromium slightly reduced.
ASTM A182 F316 Mechanical Properties
Tensile Strength, MPa (ksi)
Yield Strength, Min, MPa (ksi)
Elongation % min (2")
Reduction of Area % min
515 (75) min
205 (30) min
30
50
Identical to 304 — the molybdenum buys corrosion resistance, not strength. Supplied solution annealed; where strength drives the design, duplex 2205 offers more than double the yield. Values demonstrated per heat on the EN 10204 certificate.
A182 F316 Slip On Flange Specifications
ASTM A182 F316 Slip On Flanges are available in the following specifications:
Material
ASTM A182 F316 / ASME SA182 F316 (UNS S31600); dual-certified 316/316L; F316H for high temperature
Size
1/2"NB to 24"NB per ASME B16.5; larger patterns and EN 1092-1 stainless flanges to order
Class
150#, 300#, 400#, 600#, 900#, 1500#, 2500#
Facing
Raised Face (SORF) — default; Flat Face or RTJ where the piping class specifies
Heat Treatment
Solution annealed per ASTM A182, thermal record retained
Temperature Range
Cryogenic (no impact transition) to +538 °C per ASME B16.5; above: F316H
Installation
Two fillet welds (hub + bore), pipe set back 1/8"; E316/ER316 consumables (316L filler for dual-cert), no preheat, no PWHT
Ready Stock
Class 150 & 300 common sizes — typically quick dispatch
Certification
EN 10204 3.1 (standard) / 3.2 witnessed
Equivalent Grades of ASTM A182 F316
Standard
Werkstoff Nr.
UNS
JIS
BS
EN
SS 316
1.4401
S31600
SUS 316
316S31
X5CrNiMo17-12-2
ASME SA182 F316 is the boiler-code twin. System partners: ASTM A312 TP316 pipe and A403 WP316 fittings — the 316 trio of process piping. Certificates always state the actual grade forged, including dual 316/316L where the heat qualifies.
Why A182 F316 Slip Ons Are Specified
The Molybdenum Margin
2–3% Mo lifts pitting resistance decisively over 304 — the difference between staying bright and tea-staining in coastal air and chloride-bearing streams.
Marine-Atmosphere Proven
Sea spray, splash zones, wash-down and salt-laden air are 316's home ground — decades of service record earned it the “marine grade” name.
The Pharma Reference
316L is the clean-systems metal of ASME BPE — and food plants step up to it wherever brines and aggressive CIP chemistry run.
Full Austenitic Span
Cryogenic LNG duty to +538 °C process heat on one grade — no brittle transition, no duplex-style temperature ceiling.
How Our A182 F316 Slip On Flanges Are Manufactured
1
Forging — cut billet of certified A182 F316 heat is hot-forged into the flange blank, keeping full heat traceability from raw material to despatch.
2
Solution annealing — heated and quenched per ASTM A182 to dissolve carbides and restore the fully austenitic, corrosion-ready condition; furnace record retained.
3
Machining — hub, faces and bolt holes to ASME B16.5; the bore machined slightly over pipe OD per the slip-on tolerance.
4
Facing & finish — SORF raised face with serrated stock finish, flat face or RTJ groove; pickled and passivated on request.
5
Testing & marking — mechanical and chemical verification against the heat (intergranular corrosion testing where the order specifies), then permanent marking of grade, size, class and heat number.
6
Certification & packing — EN 10204 3.1 MTC (3.2 witnessed on request), export-packed as pictured on this page.
Where A182 F316 Slip On Flanges Are Used
Wherever chlorides threaten but immersion doesn't: coastal and marine-adjacent plants, chemical and petrochemical process lines with chloride-bearing media, pharmaceutical and biotech clean systems (316L per ASME BPE), food and beverage duty with brines and CIP chemistry, desalination pretreatment, and cryogenic systems. Our 316 production and packing below:
A182 F316 Flange — Machined & MarkedA182 F316 Flanges — Packed for ExportSS 316L Flanges — Stock at Our Works
A182 F316 Slip On Flange Dimensions
F316 slip-on dimensions follow the ASME B16.5 slip-on tables — identical for every material. Full charts by class:
Example: “Slip On Flange, 4″ NB, ASME B16.5 Class 150, RF, ASTM A182 F316/316L dual certified, EN 10204 3.1 — 50 pcs.” Ready-stock sizes quote with immediate delivery; the rest normally within 24 hours.
ASTM A182 F316 Slip On Flanges — Frequently Asked Questions
What is an ASTM A182 F316 slip on flange?
It is a slip-on flange forged from ASTM A182 F316 — stainless steel 316 (UNS S31600), the molybdenum-bearing 'marine grade' of the 300 series — dimensioned to ASME B16.5. The flange slides over the pipe end and is secured with two fillet welds, and the 2-3% molybdenum addition resists the chloride pitting that limits 304, making it the flange of coastal plants, chloride-bearing process lines and pharmaceutical piping.
What is the chemical composition of ASTM A182 F316?
Per ASTM A182 for UNS S31600: carbon 0.08% max, manganese 2.00% max, silicon 1.00% max, phosphorus 0.045% max, sulphur 0.030% max, chromium 16.0-18.0%, nickel 10.0-14.0% and molybdenum 2.00-3.00%. Against 304 the chromium drops slightly, the nickel rises to hold the austenite, and the molybdenum — the element the grade exists for — strengthens the passive film against chloride attack, lifting the PREN to roughly 24-26.
What are the mechanical properties of A182 F316 slip on flanges?
Per ASTM A182: tensile strength 515 MPa (75 ksi) minimum, yield strength 205 MPa (30 ksi) minimum, elongation 30% minimum in 2" and reduction of area 50% minimum — identical to 304, supplied solution annealed. The molybdenum buys corrosion resistance, not strength; where strength drives the design, duplex 2205 offers more than double the yield. Values are demonstrated per heat on the EN 10204 certificate.
What is the difference between 316 and 304 stainless steel?
Molybdenum. 316 adds 2-3% Mo to the austenitic base, which substantially improves resistance to chloride pitting and crevice corrosion — the difference between surviving and failing in coastal atmospheres, brackish water and chloride-bearing process streams. 304 remains the economical choice wherever chlorides are low. The practical rule: if the service or the environment sees salt, specify 316; if it doesn't, 304 does the same job for less.
What is the difference between 316 and 316L?
Carbon. 316L caps carbon at 0.030% against 316's 0.08%, preventing sensitization in weld heat-affected zones — the same L-grade logic as 304/304L. In modern practice most heats are melted low-carbon and dual-certified 316/316L, satisfying both specifications on one certificate, which suits a slip-on flange particularly well since it is welded by definition. State the requirement and we supply accordingly.
Why is 316 called marine grade — and what are its limits?
The name comes from its service record in marine atmospheres: sea spray, salt-laden coastal air, deck hardware and splash zones, where 304 tea-stains and pits while 316 stays bright. The limits matter though — 'marine grade' does not mean seawater-proof. Immersed or stagnant seawater will pit and crevice-corrode 316 in time, and warm chlorides above roughly 60 °C can crack it. Coastal and chloride-adjacent duty: yes. Seawater immersion: step up to duplex or super duplex.
Can 316 slip on flanges be used in seawater?
Not reliably for immersion or stagnant exposure. 316's PREN of about 24-26 falls short of what crevice-prone geometries in real seawater demand — gasket faces and bolt holes are exactly where attack starts. Industry practice reserves immersed and firewater seawater duty for duplex 2205 (PREN ~34) at minimum and super duplex F53/F55 (PREN ≥40) for warm, chlorinated or stagnant systems. 316 serves the coastal atmosphere, splash and wash-down world excellently — the distinction is immersion.
What temperature range can F316 slip on flanges handle?
The full austenitic span: ASME B16.5 rates 316 to 538 °C for general service, and downward there is no practical limit — no ductile-brittle transition, so 316/316L serves cryogenic systems without impact-test complications. For prolonged service above 538 °C the controlled-carbon 316H variant carries the code's creep stresses. Note that unlike duplex, 316 has no 250 °C ceiling — one of the reasons it remains the default for hot chloride-free process duty.
Can F316 slip on flanges be welded without special treatment?
Yes — two fillet welds with E316/ER316 consumables (316L filler for dual-certified material), no preheat, no PWHT. The sensitization caveat of standard-carbon austenitics applies: holding 316 at 425-815 °C can precipitate chromium carbides in the weld zone. Dual-certified 316/316L supply removes the concern, which is why it is today's default — and why the L question matters more for a slip-on, which is welded by definition.
What is the equivalent of ASTM A182 F316 in other standards?
ASME SA182 F316 is the boiler-code twin; UNS S31600 the designation; EN X5CrNiMo17-12-2 (Werkstoff 1.4401) the European equivalent; JIS SUS 316 the Japanese. System partners specified alongside it: ASTM A312 TP316 pipe and A403 WP316 fittings — the 316 trio of process piping. Certificates always state the actual grade forged, including dual 316/316L where the heat qualifies.
Is 316 stainless steel used in food and pharmaceutical piping?
Extensively — 316L is the pharmaceutical industry's reference metal, specified through ASME BPE for clean and sterile systems, and food plants step up from 304 to 316 wherever brines, salted products or aggressive CIP chemistry are involved. The molybdenum buys margin against the chloride pitting that hygienic surfaces cannot tolerate. Solution-annealed, pickled 316/316L flanges fit straight into that world.
When is 316 not enough — and what replaces it?
When chlorides get serious. Immersed seawater, hot brines, high-chloride process streams and warm stagnant water exceed 316's PREN of ~24-26, and above roughly 60 °C chlorides can drive stress-corrosion cracking through any austenitic. The escalation runs duplex 2205 (PREN ~34, plus 2.5× the strength), then super duplex F53/F55 (PREN ≥40), with 904L and 6-moly 254 SMO covering acid-plus-chloride chemistry. For reducing acids, nickel alloys take over.
What sizes and classes are A182 F316 slip on flanges available in?
From ½" to 24" NB per ASME B16.5 in Classes 150 through 2500, with larger patterns and DIN/EN 1092-1 stainless flanges forged to order. 316 is the second-highest-volume stainless grade after 304, so common Class 150/300 sizes rotate through ready stock, typically available for quick dispatch — larger sizes and higher classes are forged against the order. Every quotation states the stock position alongside price and weight.
What details are needed to get an accurate A182 F316 slip on flange quotation?
Five elements plus commercial terms: (1) size and standard — e.g. 4" NB ASME B16.5; (2) pressure class — 150 through 2500; (3) facing — SORF (raised face) default, flat face or RTJ where specified; (4) grade — F316, dual-certified 316/316L, or 316H for high-temperature service; (5) certification — EN 10204 3.1 or 3.2. No pipe schedule is needed for the slip-on bore. Add the quantity and destination and we return price, weight and delivery — often from ready stock.
Who manufactures ASTM A182 F316 slip on flanges in India?
Tesco Steel & Engineering is an ISO 9001:2015 certified flange manufacturer based in Mumbai, India, forging ASTM A182 F316 stainless steel slip on flanges from ½" to 24" NB per ASME B16.5 — alongside the 316L and 316H variants, 304 and the full 300-series family — in solution-annealed condition with ready stock in common sizes, full heat traceability and EN 10204 3.1/3.2 certification on every lot. Flanges are marked with grade, size, class and heat number and export to more than 50 countries.
