Nitronic 50 / XM-19 Round Bar Stockist, UNS S20910, W.Nr. 1.4565 Supplier

Machinability

Stainless steel grade Nitronic 50 has machinability characteristics that are similar to other austenitic stainless steels; however it requires slower speeds, more power, and higher rigidity due to its high work hardening rate. It is recommended that coated carbide tooling be used.

Forming

Stainless steel grade Nitronic 50 can be formed using the same methods applied for other austenitic stainless steels. More power for forming and forging is needed for this alloy. Forging can be done at 1177-1204°C (2150-2200°F).

Welding

Welding of stainless steel grade Nitronic 50 can be performed using traditional joining processes. Recommended filler metal should be Nitronic 50W (AWS E/ER209).

Caution should be taken while using autogenous, high power density joining processes such as EB or laser welding, due to low FN potential and severe outgassing possibility.

Heat Treatment

Final annealing process performed for several of the applications, is done at 1065°C (1950°F), which is followed by water quenching. In case this material is used in a strongly corrosive environment, annealing should be done at 1121°C (2050°F). This alloy cannot be hardened by heat treatment.

Nitronic 50 Chemical Composition

%	Cr	Ni	Mn	Mo	Si	N	Nb	Va	P	C	S
Min	20.5	11.5	4	1.5	-	0.2	0.1	0.1	-	-	-
Max	23.5	13.5	6	3	1	0.4	0.3	0.3	0.04	0.06	0.01

Chemical Properties

	Ni	Cr	Mo	Mn	Si	C	N	S	P	Cb	V	Fe
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

Mechanical Properties:

0.2% Proof Stress	380 N/mm2	55 ksi
Tensile Strength	690 N/mm2	100 ksi
Elongation, 5.65√S0 and 4D	35%
Reduction of Area	55%
Hardness (Brinell)	293 max.
Impact Strength (Room Temp)	54J av
Impact Strength (-60oC)	27J av (20J min)

Notes:

Testing shall be carried out in accordance with ASTM A370 or EN ISO 6892-1 (tensile), EN ISO 6506-1 (hardness)

Minimum properties quoted (tested at room temperature in a longitudinal direction)

Testing performed on each melt of material per heat treatment batch

Physical Properties:

Density (Kg/m3)	7880
Magnetic Permeability (20°C)	<1.05
Young’s Modulus (kN/mm2)	197
Specific Electrical Resistance, 20°C (µΩ-m)	0.82
Mean coefficient of thermal expansion, 20-100°C (m/m/°C)	17.9 x 10-6
Specific Heat, 20°C (J/kg.K)	475
Thermal conductivity, 20°C (W/m.K)	13.3

A brief history of XM-19
Originally developed in the mid-20th century, XM-19, also known as Nitronic 50, was created to provide austenitic stainless steel with superior strength and exceptional corrosion resistance. By adding nitrogen and manganese to the alloy, engineers enhanced its mechanical properties while maintaining excellent toughness. XM-19 quickly became a preferred material for demanding environments, particularly in marine and chemical processing applications.
Common applications
XM-19 is widely used in industries that require high strength and corrosion resistance. In the marine industry, it is employed in pump shafts, propeller shafts, and other components exposed to saltwater. In the chemical processing sector, it is used for valves, fittings, and heat exchangers due to its ability to withstand acidic and chloride-rich environments. Additionally, it is utilized in the food processing and energy industries, where its non-magnetic properties and resistance to wear make it a reliable choice for critical applications.
Resistance to corrosion and strength
XM-19 offers excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, even in highly aggressive environments. Its high nitrogen content enhances resistance to localized corrosion and improves mechanical strength without compromising ductility. Compared to 316 stainless steel, XM-19 provides nearly double the yield strength and superior corrosion resistance. The alloy maintains its properties at both cryogenic and elevated temperatures, making it versatile for a range of applications.
Modern Innovations
With advancements in fabrication and processing technologies, XM-19 continues to be an essential material for modern engineering challenges. Its machinability and weldability have been improved, enabling its use in complex designs and additive manufacturing applications. New heat treatment techniques further enhance its mechanical properties and corrosion resistance, making it a popular choice for advanced marine, aerospace, and industrial applications. Today, XM-19 remains a vital material in industries requiring high-performance alloys capable of withstanding extreme environments.

XM-19

Size Ranges

BAR

FLAT

TUBULAR

BILLET

Nitronic 50 Chemical Composition

Chemical Properties

Mechanical Properties:

Physical Properties:

A brief history of XM-19

Common applications

Resistance to corrosion and strength

Modern Innovations

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