XM-19 (Nitronic® 50) Material Data Sheet

The material XM-19 (Nitronic® 50) is a stainless, non-magnetizable, austenitic steel. We also see it as a modified alloy of a modified 1.3964 in its field of application at acceptable cost potential. Excellent in purity due to the ESU remelting process, the long-term mechanical properties are of course guaranteed in the best possible way (keywords, S and P contents lower). It differs from the ordinary 1.3964 by the lower content of nickel, molybdenum, but has a better resistance due to the addition of vanadium.

Field of application

The main applications of this extra-purified material are marine applications for drilling equipment, fishing tools and pumps (non-magnetic mud pump motors and the like).

Due to the even higher alloyed components of nickel; molybdenum and vanadium, its use can be equivalent to Nitronic® 50 steel applications, also for fittings and equipment in the food and medical industries. Even in the industry for beverage production including household appliances it is highly appreciated.

Mechanical properties at room temperature: up to 203 mm

Properties:

Physical properties:

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:

Heat treatment:

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

Welding: 1.3964 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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Machining with the saw is a mechanical processing of the material that results in significantly less unintentional deformation and material hardening for the existing microstructure, such as flame cutting.

Thus, the workpiece machined by the saw already has a homogeneous microstructure at the edge, which does not change in the continuation of the material.
This circumstance allows the immediate finishing of the workpiece with milling or drilling, without having to perform soft annealing or a similar operation beforehand.