209 Stainless Steel Fittings (Nitronic 50 / XM-19) – Ultra-High Strength & Seawater Immunity
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209 stainless steel fittings deliver 2× yield of 316L, PREN 34, non-magnetic. Buy genuine Nitronic 50 / XM-19 fittings – instant quote, global delivery.
Premium 209 stainless steel fittings (Nitronic 50) with mirror-polished finish
Introduction
When your piping system demands the ultimate blend of strength, corrosion resistance and non-magnetic reliability, 209 stainless steel fittings (UNS S20910, Nitronic® 50, XM-19) stand alone. This nitrogen-strengthened austenitic alloy delivers twice the yield strength of 316L while maintaining full non-magnetic properties and superior pitting resistance in seawater. From offshore valve manifolds to aerospace hydraulic lines, 209 stainless steel fittings give you near-duplex performance without the welding headaches. Discover why leading 209 stainless steel fittings suppliers worldwide are switching to genuine Nitronic 50 for the most demanding marine, chemical and energy applications.
What are 209 Stainless Steel Fittings? (Nitronic 50 / XM-19 / UNS S20910)
209 stainless steel fittings are high-nitrogen, manganese-rich austenitic components originally developed for marine fasteners. Balanced chromium (20–22 %) and molybdenum (1.5–3.0 %) provide pitting resistance comparable to 316L, while 0.15–0.40 % nitrogen boosts yield strength above 55 ksi (380 MPa)—far exceeding conventional austenitic grades. Unlike duplex alloys, Nitronic 50 remains fully austenitic after heavy cold work, ensuring non-magnetic properties essential for electronics and MRI equipment. Compared with 316L, 904L, 2205 duplex or AL-6XN, 209 stainless steel properties include better impact toughness at cryogenic temperatures and simpler welding without post-weld heat treatment.
Chemical Composition (% by mass, balance Fe)
| Element | 209 (Nitronic 50) | 316L |
|---|---|---|
| C | ≤0.06 | ≤0.03 |
| Si | ≤1.0 | ≤1.0 |
| Mn | 4.0–6.0 | ≤2.0 |
| P | ≤0.04 | ≤0.045 |
| S | ≤0.03 | ≤0.03 |
| Cr | 20.0–22.0 | 16.0–18.0 |
| Ni | 11.5–13.5 | 10.0–14.0 |
| Mo | 1.5–3.0 | 2.0–3.0 |
| N | 0.15–0.40 | ≤0.10 |
Product Range & Technical Specifications
- Types: Butt-weld (Elbow, Tee, Reducer, Cap), Forged threaded & socket-weld fittings, Branch outlets
- Standards: ASME B16.9, B16.11, MSS SP-97, ASTM A182 (forged), A403 (welded)
- Size Range: Seamless/welded 1/2"–48"; Forged 1/8"–4"
- Pressure Class: 1500–9000 psi (forged), Sch10s–XXS (butt-weld)
- Surface Finish: Pickled & passivated, polished 180–600 grit, brushed HL, sandblasted
- Threads: ISO, NPT, BSPP, BSPT, DIN 2999
Common Dimensions & Pressure Ratings
| Nominal Size (in) | OD (mm) | Class | Rating (bar) | Standard |
|---|---|---|---|---|
| 1/2 | 21.3 | 3000 | 207 | ASME B16.11 |
| 1 | 33.7 | 6000 | 414 | MSS SP-97 |
| 2 | 60.3 | Sch40s | 50 | ASME B16.9 |
| 4 | 114.3 | 9000 | 620 | ASTM A182 |
| 6 | 168.3 | Sch80s | 68 | EN 10253-4 |
Mechanical Properties (ASTM A182 / A403)
| Condition | Tensile (ksi) | Yield 0.2 % (ksi) | Elongation % | Hardness HRB |
|---|---|---|---|---|
| Annealed | ≥100 | ≥55 | ≥35 | ≤95 |
| 20 % Cold-worked | ≥145 | ≥125 | ≥20 | ≤30 HRC |
| 400 °C | ≥90 | ≥50 | ≥30 | ≤28 HRC |
| -196 °C | ≥175 | ≥140 | ≥45 | ≤35 HRC |
Full assortment of 209 stainless steel fittings – butt-weld elbows, forged tees, and reducers
Unmatched Advantages of 209 Stainless Steel Fittings
- Yield Strength ≈2× that of 316L → Significant weight & cost reduction, lower freight cost.
- PREN 33–36: Superior Pitting & Crevice Corrosion Resistance – Outperforms 316L in seawater and chloride environments.
- Outstanding Resistance to Chloride SCC & Seawater – No failure in 1000-hour ASTM G36 tests.
- Excellent Galling and Wear Resistance – Extends service life in threaded and socket-weld connections.
- Service Temperature -196°C to +400°C – Cryogenic toughness plus high-temperature strength.
- Remains Fully Non-Magnetic Even After Severe Cold Work – Ideal for electronics, MRI and submarine components.
Critical Applications & Industries
- Offshore & Subsea: Pump shafts, valve stems, seawater piping, subsea umbilicals – proven 10-year seawater exposure.
- Marine Propulsion & Seawater Systems: Heat-exchanger tubing, ballast lines, fire-water loops, deck hardware.
- Oil & Gas Downhole and Wellhead Equipment: Christmas-tree fittings, MWD/LWD tools, hydraulic control lines.
- Chemical & Petrochemical Processing: Sulfuric-acid piping, chloride scrubbers, amine units.
- Pulp & Paper Digesters: Screen baskets, bleach plant piping, digester shells.
- High-Pressure Food & Pharmaceutical Systems: Cleanable, non-magnetic, high-strength conveyors.
- Aerospace and Military Hardware: Non-magnetic bolts, landing-gear components, missile launcher parts meeting AMS 5764.
209 stainless steel fittings installed in offshore seawater injection system
Manufacturing Process & Strict Quality Control
- Electric-Arc Furnace + VOD/AOD Refining – Exact chemistry, ultra-low inclusion content.
- Continuous Casting & Forging – 250 mm billets for uniform grain structure.
- Hot Forging & Extrusion – Reducer tees, elbows at 1,200 °C under protective atmosphere.
- Cold Forming & Sizing – Mandrel-bent elbows to ±1° angle tolerance; 600G mirror polish optional.
- Solution Annealing – 1,100 °C in pure H₂ for restored corrosion resistance and bright BA finish.
- Machining & Threading – CNC lathes achieve ±0.02 mm thread accuracy; NPT, BSP, ISO threads.
- QC Testing – Spectrometer, tensile, flattening, thread gauge, 100 % PMI ensure every 209 stainless steel fitting meets specification.
Packaging & Global Logistics
- Individual Protection: Plastic caps on threads, PE sleeve on polished surfaces.
- Outer Packaging: 5-ply export carton + wooden crate, fumigation-free IPPC stamp.
- Bundling: Hexagonal bundle with 4–8 steel straps, 3×3 wooden sleepers for large fittings.
- Marking: Heat number, size, rating, standard, production date on outer carton.
- Shipping: 20 ft or 40 ft container, average 22 tons payload; same-day loading on stock items.
Why Choose Our 209 Stainless Steel Fittings?
✅ Authorized Distributor of Genuine Nitronic® 50 – UNS S20910 certified melt source.
✅ Full Material Traceability & EN 10204 3.1/3.2 Certificates – Supplied free with every shipment.
✅ Third-Party Inspection (DNV, ABS, Lloyd’s, TÜV) – Available on request.
✅ Custom Machining, Threading, and Beveling Services – In-house CNC and laser cutting.
✅ Fast Worldwide Delivery & Heavy-Duty Export Packaging – 3,000 t stock; 5-day FOB to 120+ ports; DDP available.
Heavy-duty export packaging for 209 stainless steel fittings – wooden crates & steel strapping
Frequently Asked Questions
Q1: What is the difference between 209 and 316L stainless steel fittings?
A: 209 (Nitronic 50) offers twice the yield strength, better pitting resistance (PREN 34) and remains non-magnetic, while 316L has lower alloy cost but cannot match strength or galling resistance.
Q2: Is 209 stainless steel (Nitronic 50) magnetic?
A: Essentially non-magnetic; permeability <1.005 even after severe cold working.
Q3: Can 209 fittings be used in continuous seawater service?
A: Yes, PREN ≈ 34, proven 10-year immersion tests at 30 °C without pitting; outperforms 316L in ASTM G48.
Q4: What welding consumables are required for 209 fittings?
A: Use ER209 (AWS A5.9) or commercially “Nitronic 50” filler; no pre-heat or post-weld heat treatment required.
Q5: Why is 209 significantly more expensive than 316L?
A: Higher alloy content (Cr, Mo, N) and specialized melting raise cost, but strength gain allows thinner sections, often reducing total project cost.
Q6: Maximum operating temperature and pressure ratings?
A: Continuous 400 °C, intermittent 800 °C; pressure rating follows ASME B16.11 up to 9000 psi (620 bar).
Q7: Do you supply Nitronic 50 fittings in custom heavy-wall thickness?
A: Absolutely – forged heavy-wall up to 200 mm, precision cold-finished or hot-expanded.
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