EN
Stainless Steel 316L Slip-On Flange ANSI B16.5
Product material:
SS304,304L,316,316L,2205,904L and special materials are customized.
Product caliber:
DN15mm-DN2000mm
- Overview
- Recommended Products
- Precision Forged & CNC Machined – Dimensional tolerance within ±0.5mm; ensures perfect gasket alignment and zero‑leak performance at pressures up to 3000 PSI
- Full Material Traceability – Every flange supplied with EN 10204 3.1 Mill Test Certificate; PMI (Positive Material Identification) verification available upon request for critical service lines
- Multi‑Standard Compliance – Available to ASME B16.5, EN 1092‑1, and JIS B2220; interchangeable with existing piping systems across North America, Europe, and Asia‑Pacific
- Wide Grade & Size Range – Stock covers 304/316L/321/904L in sizes 1/2"–24" (DN15–DN600), pressure ratings from Class 150 to Class 2500, ready for immediate dispatch
- Corrosion‑Resistant Surface Finish – Pickled & passivated as standard; electropolished option achieves Ra ≤ 0.8 μm for hygienic applications in food, pharma, and biotech
- Base Material: ASTM A182 stainless steel (304, 304L, 316, 316L, 321, 310S, 904L); fully annealed with verified ferrite content and intergranular corrosion resistance per ASTM A262 Practice E
- Corrosion Resistance: 316L offers pitting resistance equivalent (PREN) ≥ 25; withstands chloride concentrations up to 2000 ppm — ideal for seawater, brackish, and chemical process environments
- Standard Surface Finish: Pickled and passivated to ASTM A967 / EN 2516; removes free iron contamination and forms a uniform chromium oxide passive layer for long‑term oxidation protection
- Hygienic Finish (Optional): Electropolished to Ra ≤ 0.8 μm (ASME BPE compliant); reduces surface roughness by up to 80% compared to mill finish — prevents bacterial adhesion in food, pharma, and biotech lines
- High‑Temperature Grade (Optional): 321 and 310S grades stabilized against sensitization; continuous service up to 870°C (321) and 1150°C (310S) without scaling or loss of mechanical integrity
Description
Stainless Steel Flanges are a high‑integrity piping connection component designed for EPC contractors, industrial equipment manufacturers, and wholesale distributors seeking reliable, corrosion‑resistant joint solutions in demanding process environments. Manufactured from premium ASTM A182 stainless steel (304/316L/321/904L) with precision forging and CNC machining to ASME B16.5, EN 1092‑1, and JIS B2220 standards, these flanges offer exceptional resistance to chemical corrosion, high‑temperature oxidation, and stress cracking — ensuring zero‑leak performance and minimal maintenance over an extended service life.
Key Features
Materials & Finish
Assembly & Installation
Step‑by‑step video available — Scan the QR code on the product page or click the video thumbnail to watch a 90‑second flange assembly demonstration.
Installation at a glance:
Tools required: Torque wrench, lifting sling, gasket (PTFE / graphite / spiral‑wound), anti‑seize lubricant
Steps: 6‑step process (surface prep → align & fit‑up → insert gasket → install bolts → cross tighten → leak & pressure test)
Typical duration: ≤ 30 minutes per joint (DN50 / 2" weld neck flange, experienced crew)
Brief text instructions:
Surface preparation – Clean both flange sealing faces; remove oil, scratches, and debris. Verify pipe‑end bevel is clean and defect‑free.
Align & fit‑up – Align the two flanges face‑to‑face and insert the pipe ends; ensure bolt holes are concentric and the gap is uniform.
Insert gasket – Select a gasket (PTFE / graphite / spiral‑wound) based on the medium, and center it on the sealing face.
Install bolts – Insert bolts and nuts symmetrically; hand‑tighten first to confirm the flanges sit parallel and flush.
Cross tightening – Tighten bolts in a criss‑cross sequence in 2–3 passes, gradually reaching the specified torque value.
Leak & pressure test – Perform hydrostatic / pneumatic testing per ASME B16.5; confirm zero leakage before commissioning.
Applications
🛢️ Oil & Gas / Petrochemical
End‑user: EPC contractors, refinery operators, offshore platform builders
Downstream need: Zero‑leak, high‑pressure connections that withstand H₂S, sour gas, and cyclic thermal stress in mission‑critical process lines
Recommended grades: 316L, 321, duplex 2205
End‑user: EPC contractors, refinery operators, offshore platform builders
Downstream need: Zero‑leak, high‑pressure connections that withstand H₂S, sour gas, and cyclic thermal stress in mission‑critical process lines
Recommended grades: 316L, 321, duplex 2205
💊 Pharmaceutical & Biotechnology
End‑user: GMP facility engineers, biopharma equipment manufacturers
Downstream need: Electropolished, crevice‑free surfaces compliant with ASME BPE and 3A standards; full material traceability for audit readiness
Recommended grades: 316L (electropolished Ra ≤ 0.8 μm)
End‑user: GMP facility engineers, biopharma equipment manufacturers
Downstream need: Electropolished, crevice‑free surfaces compliant with ASME BPE and 3A standards; full material traceability for audit readiness
Recommended grades: 316L (electropolished Ra ≤ 0.8 μm)
🍺 Food & Beverage Processing
End‑user: Dairy plant operators, craft brewery engineers, CIP system integrators
Downstream need: Quick‑disconnect sanitary flanges for fast CIP/SIP cleaning cycles; no dead legs, no bacterial harborage
Recommended grades: 304L / 316L sanitary flanges, Tri‑Clamp
End‑user: Dairy plant operators, craft brewery engineers, CIP system integrators
Downstream need: Quick‑disconnect sanitary flanges for fast CIP/SIP cleaning cycles; no dead legs, no bacterial harborage
Recommended grades: 304L / 316L sanitary flanges, Tri‑Clamp
🌊 Marine & Shipbuilding
End‑user: Shipyards, offshore supply vessel operators, desalination plant engineers
Downstream need: Chloride‑resistant, seawater‑compatible flanges with long service life and minimal hull‑penetration maintenance
Recommended grades: 316L, 904L, super duplex 2507
End‑user: Shipyards, offshore supply vessel operators, desalination plant engineers
Downstream need: Chloride‑resistant, seawater‑compatible flanges with long service life and minimal hull‑penetration maintenance
Recommended grades: 316L, 904L, super duplex 2507
⚡ Power Generation & Heat Exchangers
End‑user: Power plant maintenance teams, heat exchanger OEMs, boiler manufacturers
Downstream need: High‑temperature oxidation resistance and creep strength for superheated steam and thermal cycling duty
Recommended grades: 321, 310S, 347
End‑user: Power plant maintenance teams, heat exchanger OEMs, boiler manufacturers
Downstream need: High‑temperature oxidation resistance and creep strength for superheated steam and thermal cycling duty
Recommended grades: 321, 310S, 347
💧 Water Treatment & Desalination
End‑user: Municipal water authorities, EPC water contractors, wastewater plant operators
Downstream need: Corrosion‑proof, low‑maintenance flanged joints for potable water, RO permeate, and aggressive effluent lines
Recommended grades: 304L, 316L, duplex 2205
End‑user: Municipal water authorities, EPC water contractors, wastewater plant operators
Downstream need: Corrosion‑proof, low‑maintenance flanged joints for potable water, RO permeate, and aggressive effluent lines
Recommended grades: 304L, 316L, duplex 2205
🏗️ HVAC & Fire Protection
End‑user: Commercial building MEP contractors, fire sprinkler system installers
Downstream need: Reliable, code‑compliant flanged connections for chilled water, hot water, and fire suppression piping — easy retrofit and inspection access
Recommended grades: 304, 316L
End‑user: Commercial building MEP contractors, fire sprinkler system installers
Downstream need: Reliable, code‑compliant flanged connections for chilled water, hot water, and fire suppression piping — easy retrofit and inspection access
Recommended grades: 304, 316L
🚀 Aerospace & High‑Purity Gas
End‑user: Semiconductor fabs, specialty gas panel builders, aerospace test rig engineers
Downstream need: Ultra‑high‑purity, oxygen‑clean flanges with certified cleanliness (ASTM G93 Class A) for inert and reactive gas delivery systems
Recommended grades: 316L (electropolished, oxygen‑clean)
End‑user: Semiconductor fabs, specialty gas panel builders, aerospace test rig engineers
Downstream need: Ultra‑high‑purity, oxygen‑clean flanges with certified cleanliness (ASTM G93 Class A) for inert and reactive gas delivery systems
Recommended grades: 316L (electropolished, oxygen‑clean)
