Nitronic 50 Alloy Round Bar XM-19 Stainless Steel Bar Nickel Alloy
Round Rod Custom Cutting in Length
Overview
XM-19 (also known as Nitronic 50, UNS S20910) round bar is a
high-performance austenitic stainless steel product that integrates
exceptional corrosion resistance and high strength—attributes
unmatched by many commercial alloys in its class. Engineered to
outperform conventional grades like 316 and 317, this nickel-alloy
round rod delivers reliable performance across extreme temperatures
and harsh chemical environments. We offer XM-19 round bars with
flexible customization, including diameter options from 5mm to
250mm and custom length cutting to meet precise project
requirements.
Chemical Composition (Weight %)
The superior properties of XM-19 round bar stem from its precisely
balanced chemical formulation, as specified in industry standards:
| Element | Minimum (%) | Maximum (%) |
|---|
| Carbon (C) | — | 0.06 |
| Silicon (Si) | — | 1.00 |
| Manganese (Mn) | 4.00 | 6.00 |
| Phosphorus (P) | — | 0.040 |
| Sulfur (S) | — | 0.030 |
| Chromium (Cr) | 20.50 | 23.50 |
| Nickel (Ni) | 11.50 | 13.50 |
| Molybdenum (Mo) | 1.50 | 3.00 |
| Niobium (Nb) | 0.10 | 0.30 |
| Vanadium (V) | 0.10 | 0.30 |
| Nitrogen (N) | 0.20 | 0.40 |
| Iron (Fe) | Balance | Balance |
Source: ASTM standards and material technical data sheets
Mechanical Properties
XM-19 round bar exhibits outstanding mechanical performance in both
annealed and cold-worked conditions, with strength levels far
exceeding traditional austenitic stainless steels:
| Property | Condition | Value |
|---|
| Density | 25°C | 7.7–8.03 g/cm³ |
| Elastic Modulus | 25°C | 190–210 GPa |
| Tensile Strength | Annealed | ≥ 690 MPa |
| Tensile Strength | Oil-quenched, tempered at 425°C | 1158 MPa |
| Yield Strength (Rp0.2) | Annealed | ≥ 380 MPa |
| Yield Strength (Rp0.2) | Oil-quenched, tempered at 425°C | 1034 MPa |
| Elongation (A5) | Annealed | ≥ 35% |
| Elongation | Oil-quenched, tempered at 425°C | 15% |
| Brinell Hardness (HB) | Annealed | ≤ 241 |
| Brinell Hardness (HB) | Oil-quenched, tempered at 425°C | 335 |
| Poisson's Ratio | 25°C | 0.27–0.30 |
Notably, the high-strength (HS) variant of XM-19 achieves yield
strength 3–4 times that of 316 stainless steel, while maintaining
excellent ductility and toughness even at sub-zero temperatures.
Additionally, it remains non-magnetic after cold working or
low-temperature exposure—an advantage over many austenitic alloys.
Product Standards & Specifications
Our XM-19 round bars comply with global industry standards to
ensure consistency and reliability:
- Primary Standards: ASTM A276, ASTM A479
- Material Certification: UNS S20910
- Industry Approvals: NACE MR0175/ISO 15156 (for sour service
applications), NACE MR0103
- Manufacturing Processes: Hot-rolled, cold-drawn, and centerless
ground (for precision finishes)
- Diameter Range: 5mm – 250mm (custom sizes available upon request)
- Standard Length: 1.5m – 12m (custom cutting to any length with ±1%
tolerance)
- Quality Certification: ISO 9001, with material test reports (MTRs)
provided for traceability
Key Applications
XM-19 round bar is the material of choice for industries requiring
both corrosion resistance and high strength. Its versatility makes
it suitable for:
- Oil & Gas/Petrochemical: Downhole rigging, pump shafts, valves, and
fittings—outperforming 316 and 17-4 PH in sour environments
- Marine Engineering: Marine hardware, boat shafts, chains, and
fasteners—resisting saltwater corrosion with double the yield
strength of 316
- Chemical Processing: Heat exchanger components, reactor parts, and
piping for handling aggressive chemicals
- Nuclear Industry: Nuclear fuel recycling equipment and structural
components
- Food & Beverage: Processing machinery, screens, and wire
cloth—meeting hygiene requirements
- Additional Sectors: Pulp and paper mills, textile machinery,
medical equipment, and high-strength springs
Customization & Value-Added Services
We understand that every project has unique needs, so we offer
comprehensive customization:
- Precision Cutting: Custom length cutting to your exact
specifications (no minimum order for cutting services)
- Surface Finishes: Cold-drawn (mill finish), centerless ground, and
polished options
- Packaging: Standard seaworthy packaging or custom packaging for
international shipping
- Lead Time: 7–21 days, with sample availability for quality
verification
- Supply Capacity: Up to 10,000 tons per month to support large-scale
projects
Why Choose Our XM-19 Round Bar?
- Superior Corrosion Resistance: Outperforms 316/316L and 317/317L in
general and crevice corrosion scenarios
- Unmatched Strength-to-Weight Ratio: Reduces component
cross-sections while maintaining structural integrity
- Temperature Versatility: Reliable performance from cryogenic
conditions to elevated temperatures
- Traceability: Full material certification and test reports for
quality assurance
- Flexibility: Customizable sizes and finishes to minimize waste and
installation time
