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SS XM-19 (Nitronic® 50)

The material XM-19 similar to (Nitronic® 50) is a non-magnetisable austenitic stainless steel. We also see it as a modified alloy of a modified 1.3964 in its field of application with an acceptable cost potential. The ESR remelting process gives it a particularly high degree of purity, and the long-term properties of the mechanical values are of course optimally guaranteed (keywords: lower S and P content). It differs from the usual 1.3964 due to the lower nickel and molybdenum content, but has better resistance due to the addition of vanadium.

Areas of application

The main areas of use for this high-purity xm19 ss material are maritime applications for drilling equipment, fishing tools and pumps (non-magnetic mud pump motors, etc.).

Due to the even higher alloyed components of nickel, molybdenum and vanadium, the use of Nitronic® 50 steel is also possible for fittings and equipment in the food and medical industries. It is even highly valued in the beverage industry, including the household appliance industry.

sawn steel from forged plates

Overview of the most important steel

SEW 390, UNS S20910, ASTM A276, A479, AISI XM-19, Nitronic® 50

Chemical composition

XM-19
Nitronic® 50
C Si Mn P S Cr Mo Ni V Cu N Nb
min. 4,00 20,5 1,5 11,5 0,10 0,20
max. 0,030 0,75 6,00 0,025 0,010 23,5 3,0 13,5 0,30 0,30 0,40 0,25

Characteristics

Mechanical properties at room temperature: up to 203 mm

Rp0,2 A Rp1,0 KV
N/mm2 % N/mm2 J
≥ 365 ≥ 35 ≥ 85
Up to 203 mm thickness
Tensile strength Rm 690 – 950 N/mm2
Brinell hardness Max. 293 HBW

Properties:

Weldability good without PWHT
Machinability 4   (1 = bad – 10 = good)
Corrosion resistance excellent
Forgeability medium
Mechanical properties good

Physical properties:

Density (kg/dm3 ) 7,91
Electr. resistance at 20°C (Ω mm2 /m) 0,70
Thermal conductivity at 20°C (W/m K) 14
Spec. heat capacity at 20°C (J/kg K) 460

Special features:

  • Can be used in the temperature range up to 350°C
  • non-magnetizable material (μr < 1,04)
  • No pronounced steep drop in notched bar impact values at lower temperatures

Processing:

Cold forming is possible
Cold diving is possible
Open die and closed die forging is possible
Clasping processing possible with caution (high-alloyed!)
Machining no

Heat treatment:

Before heat treatment, the material should be free of impurities.

Hot forming
Temperature Cooling
1.150°C – 950°C Air
Heat treatment
Temperature Cooling
Solution annealing (+AT) 1080°C – 1030°C Water, Air
(rapid cooling)

Welding: XM-19 (Nitronic® 50) steel is weldable by commonly used methods, recommended filler metals 1.3954 and 1.3984. The max. interpass temperature should remain below 200°C and downstream heat treatment (PWHT) depends on the geometries.

Forging: Prior to forging, the steel should be heated to 1150°C and 950°C. The forging process is carried out at 1100°C to 900°C followed by rapid air or water cooling. Surface post-treatment by pickling is advisable.

Cold forming: Due to the high strain hardening, higher forming forces are required. Note the slight increase in permeability!

Corrosion resistance: Corrosion resistance is increased compared to conventional chromium-nickel-molybdenum steel and resistance to intergranular corrosion and stress corrosion cracking is given. It can also be pointed out that this steel is resistant to sea water at temperatures up to 40°C.

Machining: Machining is somewhat more difficult (work hardening) than with the bulk steel grades due to the high alloy content with greater time required. High-quality high-speed steel or carbide should be used here. The feed rate for turning is specified as less than 0.5 mm/rev at cutting speeds of 110 to 150 m/min.

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Special steel from stock

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Specialist for sawn steel blocks directly from stock

Contact person

Karol Borycki
Phone: +1 409 2395919
Mail: info@specialsteel.com

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Popular steel:
15 5ph, 17 4ph