50 grades of stainless steel
BSSA

The BSSA has selected 50 Grades of Stainless Steel as its theme for 2014. Each week throughout the year, we will showcase one grade and illustrate the variety of corrosion resistant, mechanical and physical properties which determine its suitability for a wide range of applications.

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XM-19 1.3964 (W Nr) S20910

Yacht Rigging

Yacht Rigging

Courtesy of AK Steel

Valves

Valves

Courtesy of AK Steel

XM-19, often known by its AK Steel brand name of Nitronic 50®, is a high strength nitrogen-bearing austenitic stainless steel. It has superior corrosion resistance and strength compared to 316/316L.

Approximate Composition – 21% Cr, 5.0% Mn, 12.0% Ni, 2.0% Mo, 0.3% N plus Nb and V (vanadium). Grade 1.3964 does not appear officially in the EN system but is found in SEW 390 as Werkstoff Nummer (W Nr) 1.3964.

This grade combines the following characteristics:

  • Better pitting and crevice corrosion resistance than 316/316L and 317L depending on  the environment
  • Good yield strength (415 MPa minimum) in solution annealed condition
  • Special hot working processes allow yield strength of up to 800 MPa dependent on section size
  • Extremely high strength by cold drawing
  • Impact toughness down to cryogenic temperatures. Advantage over high strength duplex grades
  • Use at up to 580°C. Advantage over duplex grades (300°C maximum)
  • Non-magnetic even with high levels of cold work
  • Difficult to machine due to high hardness

XM-19 offers an excellent combination of high strength and corrosion resistance. Its main advantage over competitive materials like duplex grades is its much wider band of useful temperatures both at the high and low end of the spectrum. Increased solubility of nitrogen for high strength is achieved with the high manganese content. Its non-magnetic properties are vital in specialist applications like submarine hulls and minesweepers.

Applications include:

Offshore oil and gas connectors and couplings, chemical storage vessels, marine drive shafts, pump shafts, valves, yacht rigging, submarine hulls.

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