Alloy XM-19

Introduction

Nitronic50 alloy is an austenitic, nitrogen strengthened steel that has corrosion resistance superior to grade 316 and 317 stainless steels. It has very good mechanical properties at both sub-zero and elevated temperatures. The alloy is capable of retaining low magnetic permeability even after exposure to sub-zero temperatures or severe cold working conditions. In addition, the alloy has excellent resistance to sulfide stress cracking and intergranular attack. It can be readily fabricated, and it is considerably stronger than the conventional 300 series stainless steels.

Equivalent Grades Of XM-19

Zeon Grade Alloy Name UNS EN / DIN / W Nr. Trademarks
Zeon50 XM-19 UNS S20910 1.3964 Nitronic 50

Chemical Composition Of XM-19

Element Content (%)
Chromium, Cr 20.5-23.5
Nickel, Ni 11.5-13.5
Manganese, Mn 4-6
Molybdenum, Mo 1.5-3
Silicon, Si 1
Nitrogen, N  0.2-0.4
Niobium, Nb  0.1-0.3
Vanadium, V  0.1-0.3
Carbon, C 0.06
Sulfur, S  0.03
Iron, Fe Balance

Physical Properties Of XM-19

Properties Metric Imperial
Density 7.89 g/cm3 0.285 lb/in3

Mechanical Properties Of XM-19

Properties Metric Imperial
Tensile strength at break ≥ 689 MPa ≥ 100000 psi
Yield strength ≥ 379 MPa ≥ 55000 psi
Elongation at break ≥ 35% ≥ 35%

Thermal Properties Of XM-19

Properties Metric Imperial
Thermal expansion co-efficient (@25.6-93.3°C/78-200°F) 16.2 µm/m°C 9 µin/in°F
Corrosion Resistance Properties of XM-19
NITRONIC 50 provides outstanding corrosion For many applications the 1950 F (1066 C) annealed condition provides adequate corrosion resistance and a higher strength level. In very corrosive media or where material is to be used in the as-welded condition, the 2050 F (1121 C) annealed condition should be specified. HighStrength (HS) NITRONIC 50 bars are useful for applications such as shafting and bolting, but do not quite exhibit the corrosion resistance of the annealed conditions in all environments.

Processing XM-19

Machinability Machining Nitronic50 alloy requires slow speeds, positive feeds and abundant resulfurized lubricant.
Forming Nitronic50 alloy can be formed using all common forming techniques.
Welding: Nitronic50 alloy can be welded using all welding techniques such as gas tungsten arc, gas metal arc and submerged arc welding. Pre-heating is not required for this alloy.
Forging Nitronic50 alloy is forged at 1093°C (2000°F) and then heated to 1177°C (2150°F).
Annealing Nitronic50 alloy is annealed at 1038 to 1121°C (1900 to 2050°F) and quenched in water or air.
Hardening The alloy can be hardened through cold working.
Applications Fasteners, Marine hardware, Boat shafting, Pumps and valves, Sucker Rods for oil rigs.