Nitronic 50

Description

Nitronic 50® stainless steel is an austenitic stainless steel with a blend of strength and corrosion resistance that is higher than stainless steel grades 316, 316/316L, 317, and 317/317L .

The high strength, corrosion resistance, and low magnetic permeability of this alloy allows it to be used as a material for medical implants.

The following sections will discuss in detail about stainless steel grade NITRONIC® 50 (XM-19).

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.

Applications

NITRONIC® 50 (XM-19) is widely used in the following sectors:

  • Textile
  • Marine
  • Nuclear
  • Medical
  • Fertilizer
  • Chemical
  • Petroleum
  • Petrochemical
  • Food processing
  • Pulp and Paper

Some of the key products made using NITRONIC® 50 (XM-19) include:

  • Tanks
  • Valves
  • Chains
  • Cables
  • Fittings
  • Fasteners
  • Pressure vessels
  • Saltwater pumps
  • Marine hardware
  • Marine pump shafts
  • Screens and wire cloths
  • Photographic equipment
  • Underwater robotic arms
  • Positive displacement pumps