Nitronic 60 Fasteners, UNS S21800

AISI 4130 Bolts

Nitronic 60 fasteners are manufactured in all types of bolts screws, stud bolts, studs, threaded rods, nuts, washers and custom bolting parts, in metric and imperial sizes. Boltport produced these fasteners from forging stock or bar stock to relevant specifications. Nitronic 60 is alternativaly known as XM-22 and UNS S21800. So often these fasteners are ordered as per their grade equivalents. ASTM A182 FXM-33, A276 & A479 are most commonly specification for producing nitronic 60 fasteners.

Nitronic 60 is truly an all-purpose metal. This fully austenitic alloy was originally designed as a temperature alloy, and subsequently has good high temperature properties for temperatures around 1800ºF. The oxidation resistance of Nitronic 60 is similar to Type 309 Stainless Steel, and far superior to Type 304. Alloy S21800is best known for its wear and galling resistance. The additions of Silicon and Manganese have given this alloy a matrix to inhibit wear, galling, and fretting even in the annealed condition. Higher strengths are attainable through cold working the material and is still fully austenitic after severe cold-working. This working does not enhance the anti-galling properties as is normal for carbon steels and some stainless steels. The benefit to the cold or hot work put into the material is added strength and hardness, and the wear resistance does not decrease noticeably. Chromium and Nickel additions give it comparable corrosion to 304 and 316 stainless steels, while having approximately twice the yield strength. Nitronic 60, or N-60 is known for its excellent galling resistance, even at elevated temperatures. The additions of 4% silicon and 8% manganese inhibit wear, galling, and fretting. It is commonly used for various fasteners and pins that require strength and resistance to galling. It maintains decent strength up to temperatures of 1800°F and has oxidation resistance similar to that of 309 stainless steel. The general corrosion resistance is between that of 304 and 316 stainless steel.

Nitronic 60's uniform corrosion resistance is better than 304 stainless in most environments. The yield strength of Nitronic 60 is nearly twice that of 304 and 316 stainless steels. Chloride pitting resistance is superior to that of type 316 stainless; Nitronic 60 provides excellent high temperature oxidation resistance and low temperature impact.

Chemical Composition

  • Carbon C 0.10% Max
  • Manganese Mn 7.00-9.00% max
  • Sulphur S 0.03% max
  • Phophorous P 0.06% max
  • Silicon Si 3.50-4.50%
  • Nickel Ni 8.00-9.00%
  • Chromium Cr 16.0-18.0%
  • Nitrogen N 0.08-0.18%
  • Iron Fe Balance

Mechanical Properties

  • Tensile Strength : 655 MPa
  • Yield Strength : 345 MPa
  • Elongation : 35% min
  • Reduction of Area : 55% min
  • Hardness, Brinell : 241 max

Nitronic 60 Grade Equivalent

Designation UNS DIN
XM-33 S21800 1.3964

Nitronic 60 Fastening Products

Nitronic 60 Specifications

Specifications Material Form Products
ASTM A182 UNS S21800    
ASTM A240 UNS S21800    
ASTM A276 UNS S21800    
ASTM A479 UNS S21800    

Nitronic 60 Applications

Nitronic 60 fasteners are widely used for bolting pipeline components, instruments & equipments in following sectors.