Nitronic 50 (XM-19, UNS S20910)

Description

Nitronic 50 (XM-19) is a high strength and corrosion resistant austenitic stainless steel.  It has nearly double the yield strength of 304 and 316 stainless steel and has better corrosion resistance than 317L stainless steel.  XM-19 remains non-magnetic even after being severely cold worked. It maintains strength at high temperatures as well as sub-zero temperatures.  Nitronic 50 is a very versatile alloy and with Nitronic 50’s outstanding corrosion resistance it is an effective alloy for use in the petroleum, chemical, marine, nuclear, pulp and paper, textile, and food processing industries.

Chemical Composition

Chemical Composition (wt%) limits as specified in ASTM A276*

Carbon 0.06 Phosphorus 0.045
Chromium 20.5-23.5 Sulfur 0.030
Nickel 11.5-13.5 Nitrogen 0.20-0.40
Manganese 4.0-6.0 Columbium 0.10-0.30
Molybdenum 1.50-3.00 Vanadium 0.10-0.30
Silicon 1.00    

*Maximum, unless range is indicated

Physical Properties

Physical properties for XM-19

Density, lb/in3 0.285
Modulus of Elasticity, psi 26.2 x 106
Coefficient of Thermal Expansion, 68-212˚F, /˚F 9.0 x 10-6
Thermal Conductivity, Btu/ft hr ˚F 9.0
Specific Heat, Btu/lb ˚F 0.12
Electrical Resistivity, Microhm-in 28.7

Mechanical Properties

Mechanical property requirements for annealed product as specified in ASTM A276

Yield Strength, min. (ksi) 55
Tensile Strength, min. (ksi) 100
Elongation, min. (%) 35

Standards

Typical standards for XM-19 Stainless Steel

ASTM A276
ASTM A479
AMS 5764