Nitronic® 50 (XM-19)

UNS S20910
W.Nr 1.3964

Applications

Springs, valves, marine hardware, and boat shafting.

Description

Nitronic® 50 is a nitrogen-strengthened austenitic stainless steel with better corrosion resistance and higher strength than many other austenitic stainless steels. Nitronic® 50 is non-magnetic even when cold-worked or at sub-zero temperatures and provides good resistance to pitting and crevice corrosion in sea water.

Industries Supplied

Marine, Oil & Gas Extraction and Medical.

Nominal Composition

Cr: 20.5 - 23.5
Ni: 11.5 - 13.5
Mn: 4.0 - 6.0
Mo: 1.5 - 3.0
Si: 1.0 max
Fe: balance
V: 0.1 - 0.3
Cb: 0.1 -0.3
C: 0.06 max
P: 0.04 max
S: 0.03 max

Physical Properties

Density: 0.285 lb/in3, (7.88 g/cm3)

Modulus of Elasticity (E): 
At 70°F (20°C): 29.0 x 103 ksi (200 GPa)

Modulus of Rigidity (G): 
At 70°F (20°C): 10.8 x 103 ksi (74.5 Gpa)

Coefficient of Expansion:
9.6 µin/in.-°F (70°F to 600°F)
17.3 µm/m-°C (20°C to 300°C)

Electrical Resistivity: 32.3 µΩ.in, (82 µΩ.cm)

Thermal Conductivity: 108 Btu-in/ft2hr-°F (At 300°F), 15.6 W/m-k (At 149°C)

Applicable Specifications

Wire & Bar: ASTM A276, ASTM A580, ASTM F1314.

Typical Mechanical Properties – Spring Applications

  • Annealed
    • Heat Treatment: 2050°F (1120°C)
    • Tensile Strength: 100 - 145 ksi (690 - 1000 MPa)
    • Suggested Operating Conditions: -300°F to 570°F (-184°C to 300°C)
  • Spring Temper
  • Tensile Strength: 200 - 260 ksi; (1380 - 1790 MPa)
  • Suggested Operating Conditions: -300°F to 570°F (-184°C to 300°C)
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  • Nitronic® is a registered trademark of AK Steel Corporation.

    For further information Contact:

    Email: wireinfo@elgiloy.com
    Phone: 1 847 695 1900 
    Elgiloy Specialty Metals - Wire Products
    356 N.Cross Street
    Sycamore, IL 60178 USA