Nitronic® 50HS (XM-19)

Nitronic 50HS (XM-19), or N-50HS is a high strength and good corrosion resistant austenitic stainless steel. It has more than double the yield strength of 304 and 316 stainless steel and has better corrosion resistance than 317L stainless steel. Nitronic 50HS (XM-19) Stainless remains non-magnetic even after being severely cold worked. It maintains strength at high temperatures as well as sub-zero temperatures. The cold worked (HS) version meets the mechanical properties of ASTM A276 Conditions S.

Chemistry

 NiCrMoMnSiCNSPCbVFe
MIN 11.5 20.5 1.5 4.0 - - 0.2 - - 0.1 0.1 -
MAX 13.5 23.5 3.0 6.0 1.0 0.06 0.4 0.03 0.045 0.3 0.3 Balance

Specifications

AMS 5764
API 6A
ASTM A 262ASTM A 276 Condition SASTM A 370ASTM A 479ASTM A 484
ISO 15156-3
NACE MR0175
UNS S20910
W. Nr./EN 1.3964

Inventory

Nitronic® 50HS Round Bar

Common Trade Names

XM-19, N-50HS

Features

  • High strength austenitic alloy
  • Good corrosion resistance

Applications

  • Seawater pump shafts
  • Heat exchangers
  • Pressure vessels
  • Marine hardware

Physical Properties

Density: 0.285 lb/inch3
Melting Range: 2579-2642°F
Electrical Resistivity: 492 ohm circ-mil/ft

Temperature, °F 70 200 300 400 600 800 900 1000 1200 1400
Coefficient of Thermal Expansion, in/in°F x 10-6 - 9.0 - 9.2 9.6 9.9 - 10.2 10.5 10.8
Thermal Conductivity
Btu • ft/ft2 • hr • °F
108 - 108 - 124 - 141 - 160 -
Modulus of Elasticity,
psi X 106 STA
- 26.2 - - - - - - - -

* 70°F to indicated temperature.

Mechanical Properties

Minimum Specified Properties, ASTM A 276 Bar

Ultimate Tensile Strength, ksi 135
0.2% Yield Strength, ksi 105
Elongation, % 20
Reduction of Area, % 50


Nitronic® is a registered trademark of AK Steel.