Stainless 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 |