209 Stainless Steel Sheet (Nitronic® 50 / XM-19) – Ultra-High Strength Austenitic Powerhouse
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209 stainless steel sheet delivers 2× yield of 316L, superb seawater corrosion. Buy Nitronic 50 / XM-19 online from global suppliers – instant quote.
High-performance 209 stainless steel sheet with flawless 2B cold-rolled finish
Introduction
When your project demands the ultimate blend of strength, corrosion resistance and ductility, 209 stainless steel sheet (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. Whether you’re fabricating offshore pump shafts, aerospace fasteners or high-end kitchen equipment, 209 stainless steel sheet gives you 304-level formability with near-duplex performance—without the duplex price volatility. Discover why leading 209 stainless steel sheet suppliers worldwide are switching to Nitronic 50 for mission-critical applications.
What is 209 Stainless Steel Sheet? (Nitronic 50 / XM-19)
Grade 209 stainless steel sheet is a high-nitrogen, manganese-rich austenitic stainless alloy originally developed for marine fasteners. Its balanced chromium (20–23 %) and molybdenum (1.5–3.0 %) content provides pitting resistance comparable to 316L, while 0.20–0.40 % 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 2205 duplex, 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 | 0.20–0.40 | ≤0.10 |
Technical Specifications & Mechanical Properties
- Thickness Range: 0.3 mm – 50 mm (cold-rolled 0.3–3 mm; hot-rolled 3–50 mm)
- Standard Widths: 1000, 1219, 1250, 1500, 2000 mm (slit-to-width available)
- Lengths: 2000, 2438, 3000, 6000 mm or custom cut
- Surface Finishes: 2B, BA, No.4, HL, 8K mirror, embossed, anti-fingerprint
Room & Elevated Temperature Mechanical Properties
| Condition | Tensile (MPa) | Yield 0.2 % (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 |
209 stainless steel sheet available in 2B, BA, Hairline, and polished mirror finishes
Superior Advantages of 209 Stainless Steel Sheet
- Twice the Yield Strength of 316L → lighter gauges, lower freight cost.
- Excellent Pitting & Crevice Corrosion Resistance – Critical for seawater and chemical environments.
- Outstanding Galling & Wear Resistance – Extends service life in fasteners and sliding parts.
- Good High & Low Temperature Performance – From -196 °C cryogenic to 400 °C continuous service.
- Fully Austenitic = Non-Magnetic – Even after severe cold working; ideal for electronics and MRI equipment.
- Stable Alloy Cost – Lower Ni content than 304/316 shields you from LME nickel volatility.
Applications & Industries
- Marine & Offshore: Propeller shafts, pump impellers, valve stems, rigging hardware that resist seawater pitting.
- Oil & Gas: Downhole tooling, Christmas-tree fittings, hydraulic lines exposed to H₂S and CO₂.
- Chemical Processing: Heat-exchanger plates, reactor vessels, sulfuric-acid storage tanks.
- Food & Pharmaceutical: High-strength sanitary conveyors, blenders, tablet presses where cleanliness and strength merge.
- Aerospace & Military: Aircraft exhaust stacks, missile launcher components, non-magnetic ship fittings.
- High-Performance Fasteners & Springs: Lock washers, bolts, clips that must not gall or relax under vibration.
209 stainless steel sheet fabricated into high-strength marine propeller shafting
Manufacturing Process & Quality Assurance
- Electric-Arc Furnace + AOD Refining – Exact chemistry control, low inclusion content.
- Continuous Casting – 200 mm slabs for uniform grain structure.
- Hot Rolling – Reheat to 1,200 °C, roll to 3–50 mm plate or 2–3 mm transfer bar.
- Cold Rolling – Transfer bar reduced to 0.3–3 mm with ±0.02 mm tolerance.
- Bright Annealing – 1,100 °C in pure H₂ for mirror BA finish and restored corrosion resistance.
- Finishing – Skin-pass for 2B, polish lines for No.4/HL, super-polish for 8K mirror.
- QC Testing – Spectrometer, ultrasonic thickness, ASTM tensile, and intergranular corrosion tests ensure every Nitronic 50 sheet meets spec.
Maintenance & Cleaning Guide
- Routine Cleaning: Warm water + mild detergent, soft cloth, rinse and dry.
- Fingerprint Removal: 1 % vinegar solution, wipe along grain, buff with microfiber.
- Avoid: Chloride bleach, hydrochloric acid, steel wool or abrasive powders.
- Storage: Elevate on wooden pallets, cover with breathable PE film, keep away from moisture and carbon steel dust.
- Passivation: Optional citric acid bath after fabrication to remove free iron and enhance 209 stainless steel properties.
Why Choose Our 209 Stainless Steel Sheet?
✅ Genuine Nitronic® 50 / XM-19 Stock – UNS S20910 certified melt source.
✅ Mill Test Certificates EN 10204 3.1 – Supplied free with every shipment.
✅ Precision Cutting – Laser, water-jet, plasma within ±0.2 mm; circles, blanks, slit coils.
✅ Global Export & Fast Delivery – 3,000 t stock; 5-day FOB to 120+ ports.
✅ Competitive Pricing & Bulk Discounts – Lock 209 stainless steel sheet price for 30 days on contract.
✅ Free Samples – Courier within 48 hours for qualification tests.
Precision-cut and packed 209 stainless steel sheets ready for worldwide delivery
Frequently Asked Questions
Q1: What is the difference between 209 and 316L stainless steel?
A: 209 (Nitronic 50) offers twice the yield strength, better pitting resistance and remains non-magnetic, while 316L has higher nickel and molybdenum but lower strength.
Q2: Is 209 stainless steel (Nitronic 50) magnetic?
A: Essentially non-magnetic even after severe cold working; permeability <1.005.
Q3: Can 209 stainless steel sheet withstand seawater?
A: Yes, PREN ~34 exceeds 316L; proven in long-term immersion tests at 30 °C.
Q4: What is the maximum service temperature?
A: Continuous 400 °C; intermittent 800 °C without scaling; cryogenic -196 °C with high impact toughness.
Q5: Is 209 suitable for welding?
A: Absolutely – TIG, MIG, SMAW pass AWS D1.6 without pre-heat or post-weld heat treatment.
Q6: Why is 209 more expensive than 304/316?
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 sheet in custom widths?
A: Yes, slit coils from 20 mm to 2,000 mm with ±0.1 mm tolerance.
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