Nitronic®50 Stainless steel

Nitronic 50 is a type of austenitic stainless steel. Its corrosion resistance and strength are beyond comparison with those of commercial materials at the same price. The corrosion resistance of Nitronic 50 is superior to that of materials such as 316, 316L, 317, and 317L, and its yield strength at room temperature is as high as twice that of these grades. The yield strength of the high-strength Nitronic 50 (HS) can reach 3 to 4 times that of 316 stainless steel. In addition, Nitronic 50 has good mechanical properties in both elevated temperature and low temperature environments. Different from most austenitic stainless steels, Nitronic 50 will not be magnetized when it is cold worked or cooled to sub-zero temperatures.

Applications:

Nitronic 50 has great advantages in applications where the performance of 316, 316L, 317 and 317L reaches its limit. This material is widely used in the petroleum, petrochemical, chemical, fertilizer, nuclear fuel recycling, paper-making, textile, food processing and maritime industries. Nitronic 50 is used to manufacture parts that require both corrosion resistance and high strength, such as pumps, valves, connectors, fasteners, cables, wire mesh screens, wire cloth, marine hardware, ship shafts, pump shafts, heat exchanger parts, springs, photographic equipment, etc.

Chemical Composition:

Carbon: 0.030 - 0.050%

Manganese: 4.00 - 5.50%

Phosphorus: Less than 0.040%

Sulfur: 0.20 - 0.60%

Chromium: 20.50 - 22.00%

Nickel: 11.75 - 13.00%

Molybdenum: 2.00 - 2.50%

Copper: Less than 0.75%

Nitrogen: 0.24 - 0.30%

Titanium: Less than 0.020%

Aluminum: Less than 0.020%

Boron: 0.0008 - 0.0025%

Cobalt: 0.12 - 0.20%

Tantalum: Less than 0.10%

Tin: Less than 0.030%

Vanadium: 0.10 - 0.30%

Tungsten: Less than 0.15% 

Corrosion Resistance

In most media, the corrosion resistance of Nitronic 50 is superior to that of 316, 316L, 317 and 317L. In most applications, Nitronic 50 in the annealed state at 1066°C can provide sufficient corrosion resistance while having higher strength. In highly corrosive environments or when the material needs to be welded, the annealed state at 1121°C should be adopted. The high-strength state (HS) of Nitronic 50 is often used to manufacture parts such as shafts and nuts, but its corrosion resistance is generally average.

Physical Properties

Density (at 24°C): 7.88 g/cm³

Electrical Resistance (at 21°C): 80 microhm-cm

Magnetic Flux

Nitronic 50 will not be magnetized even after severe cold working. In a low-temperature environment, the magnetic flux of Nitronic 50 remains very low. At -240°C, the magnetic susceptibility of Nitronic 50 will reach a peak value. This phenomenon is related to the temperature rather than the magnetic field strength.

Annealing Temperature

Nitronic 50 can be supplied in an annealed state at a temperature ranging from 1066°C to 1121°C. For the vast majority of applications, the annealed state at 1066°C should be selected, as it offers higher mechanical properties and excellent corrosion resistance. If welded parts are used in a highly corrosive environment, the annealed state at 1121°C should be chosen.

Similar to other austenitic stainless steels, Nitronic 50 requires rapid cooling after annealing. For cold forming processes, annealing should be carried out at intervals, and the annealing temperature is 1066°C.

Machining Performance

Although the performance of Nitronic 50 is superior to that of the 300 series stainless steels, they can be processed using the same equipment and processes.

Forging

The forging process of Nitronic 50 is similar to that of 316 stainless steel, except that more energy is required. The forging temperature range is 1177°C - 1232°C.

Welding

Nitronic 50 is suitable for all conventional welding methods applicable to austenitic stainless steels. There is no need for pre-welding preheating or post-welding annealing.

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