209 Stainless Steel Plate (Nitronic 50 / XM-19) – Ultra-High Strength Austenitic Powerhouse
Meta Description (143 characters):
209 stainless steel plate delivers 2× yield of 316L, PREN 34, full non-magnetic. Buy genuine Nitronic 50 / XM-19 plate – instant quote, global delivery.
Heavy-duty 209 stainless steel plate (Nitronic 50) in hot-rolled No.1 finish
Introduction
When your project demands the ultimate blend of strength, corrosion resistance and non-magnetic reliability, 209 stainless steel plate (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 bulkheads, 209 stainless steel plate gives you near-duplex performance without the welding headaches. Discover why leading 209 stainless steel plate suppliers worldwide are switching to genuine Nitronic 50 for the most demanding marine, chemical and energy applications.
What is 209 Stainless Steel Plate? (Nitronic 50 / XM-19 / UNS S20910)
209 stainless steel plate is a high-nitrogen, manganese-rich austenitic alloy originally developed for marine fasteners. Its balanced chromium (20–22 %) and molybdenum (1.5–3.0 %) content 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 | 20.0–22.0 | 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 |
Technical Specifications
- Thickness Range: 3 mm – 150 mm (hot rolled), 0.6 mm – 50 mm (cold rolled)
- Width: Up to 3200 mm (slitting down to 20 mm)
- Length: Up to 12000 mm or custom cut; coil-fed or blanked
- Surface: No.1 (hot rolled), 2B, 2D, polished, ground
- Standards Compliance: ASTM A240, A480, ASME SA-240, NORSOK M-650
Mechanical Properties (ASTM A240)
| Condition | Tensile (MPa) | Yield (MPa) | Elongation % | Hardness HRB |
|---|---|---|---|---|
| Annealed | ≥690 | ≥380 | ≥35 | ≤95 |
| 20 % Cold-worked | ≥1000 | ≥760 | ≥20 | ≤30 HRC |
| 400 °C | ≥650 | ≥360 | ≥30 | ≤28 HRC |
| -196 °C | ≥1200 | ≥900 | ≥45 | ≤35 HRC |
Corrosion Resistance Data
| Test | 209 (Nitronic 50) | 316L |
|---|---|---|
| PREN | 33–36 | 25–28 |
| CPT (°C) | ≥35 | ≥25 |
| SCC 1000 h | No cracking | Minor cracking |
| Seawater 10 yr | No pitting | Light pitting |
209 stainless steel plate with precision-ground and polished surface
Unmatched Advantages of 209 Stainless Steel Plate
- Yield Strength ≈2× that of 316L → Dramatic weight & thickness 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; proven 10-year immersion.
- Excellent Galling and Wear Resistance – Extends service life in sliding and threaded 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
- Offshore Platforms & Subsea Equipment: 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 Processing Tanks and Pressure Vessels: Sulfuric-acid piping, chloride scrubbers, amine units.
- Pulp & Paper Digesters: Screen baskets, bleach plant piping, digester shells.
- High-Strength Cryogenic Components: LNG piping, submarine hull inserts, rocket motor casings.
- Military and Aerospace Structural Parts: Non-magnetic bolts, landing-gear components, missile launcher parts meeting AMS 5764.
Thick 209 stainless steel plate used in offshore seawater handling system
Manufacturing Process & Quality Assurance
- Electric-Arc Furnace + VOD/AOD Refining – Exact chemistry, ultra-low inclusion content.
- Continuous Casting & Hot Rolling – 250 mm slabs for uniform grain structure.
- 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 plate meets specification.
Packaging & Global Logistics
- 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 Plate?
✅ Authorized Stockist 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 Approvals (DNV, ABS, Lloyd’s, TÜV) – Available on request.
✅ Precision Cutting, Beveling, and Drilling 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.
FAQ Section (7–8 Detailed Questions)
Q1: What is the difference between 209 and 316L stainless steel plate?
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 plate (Nitronic 50) magnetic?
A: Essentially non-magnetic; permeability <1.005 even after severe cold working.
Q3: Can 209 plate 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 is required?
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 service temperature?
A: Continuous 400 °C, intermittent 800 °C; cryogenic -196 °C with high impact toughness.
Q7: Do you supply 209 stainless steel plate in custom heavy-wall thickness?
A: Absolutely – heavy-wall up to 150 mm, precision cold-finished or hot-expanded.
Call to Action
Request Instant Quote for 209 Stainless Steel Plate Now!
Genuine Nitronic 50 stock – Contact us today for mission-critical projects!