Stainless Steel XM-19 Round Bars Manufacturer, Supplier & Exporter in Mumbai, India

What is Stainless Steel XM-19 Round Bar?

Stainless Steel XM-19 (also known as UNS S20910) is an austenitic stainless steel alloy, commonly referred to as Nitronic 50, with nitrogen strengthening for superior mechanical properties. XM-19 is part of the Nitronic family, designed for applications where corrosion, wear, and galling resistance are critical.

Key characteristics of SS XM-19 include:

• Nitrogen-strengthened austenitic stainless steel
• Exceptional galling and wear resistance
• Excellent corrosion resistance in oxidizing and reducing media
• High strength and toughness at ambient and elevated temperatures
• Non-magnetic in annealed condition
• Weldable and machinable with proper techniques

SS XM-19 Round Bars are used for high-performance pumps, shafts, fasteners, valves, and chemical processing equipment.

Key Features of SS XM-19 Round Bars

• Superior resistance to galling, wear, and thread seizing
• Excellent resistance to pitting, crevice, and stress corrosion cracking
• High tensile and yield strength
• Non-magnetic in annealed condition
• Excellent toughness at both cryogenic and elevated temperatures
• Weldable and fabricated with standard techniques
• High dimensional stability and precise machining performance

This combination makes XM-19 ideal for marine, chemical, aerospace, and industrial applications.

Chemical Composition of Stainless Steel XM-19 Round Bars (%)

• Chromium (Cr): 20 - 23
• Nickel (Ni): 11 - 13
• Manganese (Mn): 2 - 5
• Nitrogen (N): 0.25 - 0.45
• Silicon (Si): ≤ 1
• Carbon (C): ≤ 0.03
• Iron (Fe): Balance

Role of Alloying Elements

• Chromium: Provides corrosion resistance and oxidation protection
• Nickel: Stabilizes the austenitic structure and improves toughness
• Nitrogen: Enhances yield strength, pitting resistance, and prevents sensitization
• Manganese: Supports nitrogen solubility and toughness
• Carbon: Low carbon ensures minimal carbide precipitation

Mechanical Properties of SS XM-19 Round Bars

SS XM-19 offers high-performance mechanical properties:

• Tensile Strength: 860 - 1000 MPa
• Yield Strength (0.2% Offset): 620 - 750 MPa
• Elongation: 35 - 45%
• Hardness: 201 - 241 HB (Brinell)

These mechanical properties are significantly higher than conventional austenitic stainless steels such as 304 or 316, making XM-19 ideal for critical components subjected to wear and stress.

Physical Properties of Stainless Steel XM-19

• Density: 7.9 g/cm³
• Modulus of Elasticity: 193 – 200 GPa
• Melting Range: 1400 – 1450°C
• Thermal Conductivity: 16 W/m·K
• Electrical Resistivity: 0.75 μΩ·m
• Magnetic: Non-magnetic in annealed condition

This combination of properties allows XM-19 round bars to perform reliably in corrosive, marine, and high-strength industrial applications.

Corrosion Resistance of SS XM-19 Round Bars

SS XM-19 provides:

• Excellent resistance to oxidizing acids such as nitric and ferric acid
• Moderate resistance to reducing acids like hydrochloric and sulfuric acid
• Superior chloride pitting resistance and stress corrosion cracking resistance
• Exceptional galling and seizing resistance for threaded and sliding components

Nitronic 60 is widely used in chemical processing plants, seawater systems, desalination plants, marine hardware, and industrial machinery where corrosion and wear resistance are critical.

Heat Treatment of SS XM-19

SS XM-19 is solution annealed to achieve optimum mechanical properties and corrosion resistance:

Step 1: Solution Annealing

• Heat to 1040 – 1120°C
• Rapid water quench

Step 2: Stress Relief (Optional)

• Heat to 400 – 600°C to relieve internal stresses

No precipitation hardening is required, and proper solution annealing ensures maximum corrosion resistance and mechanical performance.

Machinability of SS XM-19 Round Bars

SS XM-19 requires controlled machining due to its high work-hardening tendency:

• Use carbide cutting tools for best results
• Maintain moderate cutting speeds and feeds
• Apply coolant to prevent overheating and galling
• Machining in solution-annealed condition is recommended
• Threaded components benefit from anti-galling coatings or lubrication

Weldability of Stainless Steel XM-19 Round Bars

SS XM-19 can be welded using standard austenitic stainless steel methods:

• TIG (GTAW), MIG (GMAW), and SMAW are suitable
• Low carbon and nitrogen content minimizes carbide precipitation
• Post-weld stress relief recommended for thick sections
• Compatible filler metals include ER2209 or ER316L

Proper welding ensures retention of corrosion resistance and mechanical strength.

Available Sizes & Specifications

SS XM-19 Round Bars are supplied in:

Standards:

• ASTM A276
• ASTM A479
• UNS S20910

Size Range:

• Diameter: 6 mm to 300 mm
• Length: 3m, 6m, or custom cut lengths
• Tolerances: As per ASTM / UNS standards

Surface Finish:

• Hot Rolled / Bright
• Polished
• Centerless Ground

Applications of Stainless Steel XM-19 Round Bars

SS XM-19 is used in high-strength, high-wear, and high-corrosion environments:

Chemical & Petrochemical Industry

• Pumps, valves, and shafts
• Heat exchangers
• Reactor components
• Mixer shafts

Marine & Offshore Applications

• Propeller shafts
• Seawater valves and fittings
• Offshore platform hardware

Industrial & Heavy Machinery

• High-strength fasteners, bolts, and screws
• Shafts, rods, bearings, and bushings
• Wear-resistant machinery parts

Aerospace Industry

• Aerospace fasteners and landing gear components
• Rotating shafts

Advantages of Stainless Steel XM-19 Round Bars

• High tensile and yield strength
• Excellent corrosion resistance, pitting resistance, and stress corrosion cracking resistance
• Superior galling and wear resistance
• Non-magnetic in annealed condition
• Long service life and durability
• Suitable for machining, welding, and fabrication
• Reliable performance in chemical, marine, aerospace, and industrial environments

Quality Testing & Inspection

All SS XM-19 Round Bars undergo:

• Chemical composition verification
• Mechanical property testing
• Hardness testing
• Dimensional inspection
• Ultrasonic testing
• Surface finish inspection

Mill Test Certificates (MTC) are provided according to ASTM / UNS standards. Third-party inspection is available upon request.

Why Choose Virami Steel Hub for SS XM-19 Round Bars?

• Trusted stainless steel manufacturer and supplier in Mumbai
• Aerospace, chemical, and marine-grade materials
• Competitive global pricing
• Custom sizes, lengths, and heat treatment options
• Certified quality assurance
• Global shipping and reliable delivery
• Expertise in high-performance industrial applications

Conclusion

Stainless Steel XM-19 Round Bars are high-performance austenitic stainless steel products offering exceptional corrosion resistance, galling resistance, wear resistance, and high mechanical strength. SS XM-19 is widely used in chemical processing, marine, aerospace, oil & gas, and industrial machinery applications.

Virami Steel Hub supplies premium-quality SS XM-19 Round Bars with certified testing, global delivery, and customizable sizes. Our products are engineered to deliver reliability, durability, and performance in critical high-strength and corrosive environments.