209 Stainless Steel Coil (Nitronic 50 / XM-19) – Ultra-High Strength Austenitic Powerhouse
Meta Description (138 characters):
209 stainless steel coil delivers 2× yield of 316L, PREN 34, seawater immunity. Buy genuine Nitronic 50 / XM-19 from global suppliers – instant quote.
Premium 209 stainless steel coil (Nitronic 50 / XM-19) with flawless 2B cold-rolled finish
Introduction
When your project demands the ultimate combination of strength, corrosion resistance and ductility, 209 stainless steel coil (UNS S20910, Nitronic® 50, XM-19) stands alone. This nitrogen-strengthened austenitic grade achieves twice the yield strength of 316L while maintaining full non-magnetic properties and superior pitting resistance in seawater. From offshore pump shafts to aerospace fasteners, 209 stainless steel coil gives you near-duplex performance without the welding headaches. Discover why leading 209 stainless steel coil suppliers worldwide are switching to genuine Nitronic 50 for mission-critical applications.
What is 209 Stainless Steel Coil? (Nitronic 50 / XM-19 / UNS S20910)
209 stainless steel coil is a high-nitrogen, manganese-rich austenitic alloy originally developed for marine fasteners. Its balanced chromium (20–23 %) and molybdenum (1.5–3.0 %) provides 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 | 20.0–23.0 | 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 |
Technical Specifications & Mechanical Properties
- Thickness Range: 0.3 mm – 12 mm (cold-rolled 0.3–3 mm; hot-rolled 3–12 mm)
- Widths: 1000, 1219, 1250, 1500, 2000 mm (precision slitting down to 20 mm)
- Coil ID: 508 mm (20 in) or 610 mm (24 in)
- Coil Weight: 5–25 tons per coil (custom weight splitting offered)
- Surface Finishes: 2B, BA, No.1, No.4, HL, 8K mirror, embossed, anti-fingerprint
Room & Elevated Temperature Mechanical Properties
| 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 |
209 stainless steel coil available in 2B, No.1, BA, and polished finishes
Outstanding Advantages of 209 Stainless Steel Coil
- Yield Strength Twice that of 316L – Down-gauge walls, reduce weight and freight cost.
- Exceptional Pitting & Crevice Corrosion Resistance – PREN ≈ 33–36, outperforming 316L in seawater.
- Excellent Resistance to Chloride Stress Corrosion Cracking – No failure in 1000-hour ASTM G36 tests.
- Superior Galling and Wear Resistance – Extends service life in fasteners and sliding parts.
- Maintains Properties from -196°C to 400°C – Cryogenic toughness plus high-temperature strength.
- Fully Non-Magnetic Even After Severe Cold Work – Ideal for electronics, MRI and submarine components.
Key Applications & Industries
- Marine & Offshore: Pump shafts, valve stems, seawater piping, rigging hardware – proven 10-year seawater exposure.
- Oil & Gas Downhole Tooling: Drill collars, subsurface safety valves, Christmas-tree fittings exposed to H₂S/CO₂.
- Chemical & Petrochemical: Heat-exchanger coils, sulfuric-acid piping, chloride scrubbers.
- Food & Pharmaceutical: High-strength sanitary tubing, blenders, tablet presses where cleanliness and strength merge.
- Aerospace Fasteners and Components: Non-magnetic bolts, pins, landing-gear components meeting AMS 5764.
- High-Performance Springs and Bellows: Maintains elasticity at -196°C for LNG plants.
209 stainless steel coil fabricated into high-strength marine pump shaft
Manufacturing Process & Strict Quality Control
- Electric-Arc Furnace + AOD/VD Refining – Exact chemistry, low inclusion content.
- Continuous Casting – 200 mm slabs for uniform grain structure.
- Hot Rolling – Reheat to 1,200 °C, roll to 3–12 mm plate or 2–3 mm transfer band.
- Cold Rolling & Bright Annealing – 20-roll Sendzimir mill achieves ±0.01 mm thickness; BA at 1,100 °C in pure H₂ for mirror finish.
- Skin Pass & Tension Leveling – Ensures flatness ≤3 IU and surface roughness ≤0.2 µm on BA coils.
- Slitting & Edge Dressing – Precision slitters with camber ≤1 mm per 2 m; deburred edges for safe handling.
- QC Testing – Spectrometer, tensile, cupping, surface roughness, and intergranular corrosion per ASTM A763 ensure every 209 stainless steel coil meets specification.
Packaging & Global Logistics Standards
- Inner Core: 7 mm thick paperboard protecting coil ID.
- Outer Wrap: 0.1 mm PE film + 0.2 mm VCI paper + galvanized steel guard.
- Radial Protection: 30 mm foam board on coil edges.
- Palletizing: Wooden pallet + steel straps, fumigation-free IPPC stamp.
- Marking: Heat number, size, weight, production date on outer wrap and side tag.
- Shipping: 20 ft or 40 ft container, average 22 tons payload; same-day loading on stock items.
Why Choose Our 209 Stainless Steel Coil?
✅ Authorized Stockist of Genuine Nitronic® 50 – UNS S20910 certified melt source.
✅ Full Traceability & EN 10204 3.1/3.2 Certificates – Supplied free with every shipment.
✅ Third-Party Inspection – SGS, TUV, Lloyd’s Register available on request.
✅ Precision Services – Slitting, cut-to-length, polishing, anti-fingerprint coating in-house.
✅ Global Export & Fast Delivery – 3,000 t stock; 5-day FOB to 120+ ports; DDP available.
✅ Competitive Pricing & Bulk Discounts – Lock 209 stainless steel coil price for 30 days on contract.
Heavy-duty export packaging – eye-to-sky, waterproof, steel strapped, ready for ocean freight
Frequently Asked Questions
Q1: What is the difference between 209 and 316L stainless steel coil?
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 coil (Nitronic 50) magnetic?
A: Essentially non-magnetic; permeability <1.005 even after severe cold working.
Q3: Can 209 withstand continuous seawater exposure?
A: Yes, PREN ≈ 34, proven 10-year immersion tests at 30 °C without pitting; outperforms 316L in ASTM G48.
Q4: What welding filler should be used for 209 coil?
A: Use ER209 (AWS A5.9) or commercially “Nitronic 50” filler; no pre-heat or post-weld heat treatment required.
Q5: What is the maximum service temperature?
A: Continuous 400 °C; intermittent 800 °C without scaling; cryogenic -196 °C with high impact toughness.
Q6: Why is 209 more expensive than standard grades?
A: Higher alloy content (Cr, Mo, N) and specialized melting raise cost, but strength gain allows thinner sections, often reducing total project cost.
Q7: Do you supply Nitronic 50 coil in custom slit widths?
A: Absolutely – precision slitting 20–2000 mm with ±0.02 mm tolerance and oscillation winding for long runs.
Call to Action
Request Instant Quote for 209 Stainless Steel Coil Now!
Limited stock of genuine Nitronic 50 – Contact us today!