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XM-19 (UNS S20910/Nitronic 50) Austenitic Stainless Steel Bar
XM-19 is a nitrogen-strengthened austenitic stainless steel with exceptional corrosion resistance, high mechanical strength, and superior performance in chloride environments. Key advantages include:
- Dual resistance:Combines high tensile strength (≈690 MPa) with excellent corrosion resistance.
- Thermal stability:Maintains mechanical properties at elevated temperatures (up to 540°C).
- Weldability:Good formability and compatibility with standard welding techniques.
Chemical Composition (wt%)
Element | Content (%) |
C | ≤0.06 |
Si | ≤1.00 |
Mn | 4.00-6.00 |
P | ≤0.045 |
S | ≤0.030 |
Cr | 20.5-23.5 |
Ni | 11.5-13.5 |
Mo | 1.5-3.00 |
N | 0.20-0.40 |
Nb/V | 0.10-0.30 |
Property | Value |
Density | 7.8 g/cm³ |
Yield Strength | 380 MPa (min) |
Tensile Strength | 690 MPa (min) |
Elongation | ≥35% |
Hardness (HB) | ≤187 |
Size Range | Diameter: 5.5-600mm |
XM-19 Stainless Steel Bar: Performance Characteristics and Applications
1. Performance Characteristics
XM-19 (UNS S20910) is a nitrogen-strengthened austenitic stainless steel with outstanding performance characteristics:
1.1 High Strength
Nitrogen strengthening provides significantly higher tensile strength than conventional 304/316 stainless steels. Its room temperature yield strength reaches over 380 MPa, twice that of 316 stainless steel.
This high mechanical strength makes it suitable for high-stress environments, such as heavy machinery and structural support components.
1.2 Excellent Corrosion Resistance
Containing chromium (20.5%-23.5%) and molybdenum (1.5%-3.0%), it resists pitting, crevice corrosion, and chloride stress corrosion, and performs reliably in harsh environments such as marine and chemical industries.
It is resistant to high-temperature corrosion, maintaining mechanical properties below 649°C.
1.3 Good Machinability and Weldability
The austenitic structure makes it easy to cold work and weld, making it compatible with conventional stainless steel processes.
No annealing is required after welding, resulting in excellent joint performance.
1.4 Non-Magnetic
After solution treatment, it remains non-magnetic, making it suitable for magnetism-sensitive applications such as electronics and medical.
2. Main Applications
XM-19 stainless steel bar is widely used in various fields:
2.1 Marine Engineering
Used in seawater pumps, tanker ballast system valves, deep-sea samplers, etc., resistant to seawater corrosion and able to withstand high pressure.
2.2 Chemical and Energy
Manufacturing urea production equipment, heat exchangers, pipes, and valves, resistant to acidic media and high-temperature environments.
2.3 Aerospace
Used as aircraft structural components and rocket fasteners, it combines lightweight and high-strength requirements.
2.4 Medical and Food
Used in surgical instruments, implants (excellent biocompatibility), and food processing equipment, meeting hygienic standards.
2.5 Nuclear Energy and Petroleum
Used in nuclear waste treatment systems and oilfield equipment, resistant to radiation and extreme corrosion conditions.
XM-19 stainless steel bar is an ideal structural material choice for many industries through its balanced composition and performance.
Surface Treatment
- Grinding:Precision-ground bars for high dimensional accuracy.
- Pickling:Acid treatment to remove oxide layers.
- Passivation:Enhances corrosion resistance.
Why Choose Us ?
- Certified:Compliant with ASTM A276, A479, and ASME standards.
- Customization:Tailored sizes and shapes (round, square, hexagon).
- Logistics:Global shipping with HSF (Halogen-Free) packaging.
Applications & Industries
Aerospace:
High-power density actuators.
Electronics:
Precision sensors & MEMS components.
Energy:
Magnetic coupling devices for turbines.
Frequently Asked Questions
Q1: How does XM-19 compare to 316L?
A1: 2x higher yield strength and better chloride resistance.
Q2: Is heat treatment required?
A2: Solution annealing (1040-1120°C) recommended for optimal properties
Q3: What welding methods are suitable for XM-19?
A: TIG, MIG, and shielded metal arc welding are commonly used. ER209 electrodes are recommended, with no preheat or post-weld annealing typically required.
Q4: Where is XM-19 bar most commonly used?
A: Primary applications include marine equipment (pumps, valves), chemical processing components, and nuclear waste containment systems.
Q5: How does XM-19 perform in corrosive environments?
A: The high chromium and nitrogen content provide excellent resistance to pitting and crevice corrosion, making it ideal for marine and chemical applications.
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