Alloy 6Mo • UNS S31254 • WNR 1.4547

6 Mo (UNS S31254) is a super austenitic stainless steel with a high level of molybdenum and nitrogen, providing high resistance to pitting and crevice corrosion as well as high strength compared with conventional austenitic stainless steels such as 316L.

The alloy can provide excellent resistance to stress corrosion cracking allowing tube cold formingand may be used without the necessity to re-anneal at testing up to 120°C.

Available tube product forms

Typical Applications

Typical manufacturing specifications

  • ASTM A213
  • ASTM A269
  • ASTM A312
  • BS EN 10216 pt.5
  • Also individual customer specifications.

Industries predominantly using this grade            

Technical Data

Typical Chemical Composition (% by weight)

Title UNS Werkstoff C Si Mn P S Cr Ni Mo Cu N
316L S31603 1.4404 0.03 1 2 0.045 0.015 17.5 11.5 2.25 - -
317L S31703 1.4439 0.03 1 2 0.045 0.3 19 13 3.5 - -
904L N08904 1.4539 0.02 1 2 0.045 0.035 21 25.5 - - -
6mo S31254 1.4547 <0.02 0.7 1 0.3 0.01 20 18 6.1 0.75 0.2
625 N06625 2.4856 0.1 0.5 0.5 0.015 0.5 21.5 58 8.5 - -
C276 N10276 2.4819 0.01 0.08 1 0.04 0.03 15.5 55 16 Co
2.5
W
3.75


Physical Properties (Room Temperature)

Specific Heat (0-100°C) 500 J.kg-1.°K-1
Thermal Conductivity 14 W.m -1.°K-1
Thermal Expansion 16.5 mm/m/°C
Modulus Elasticity 196 GPa
Electrical Resistivity 8.5 μohm/cm
Density 8.0 g/cm3


Mechanical Properties

Temper Annealed
Tensile Rm 98 ksi (min)
Tensile Rm 675 MPa (min)
R.p. 0.2% Yield 45 ksi (min)
R.p. 0.2% Yield 310 MPa (min)
Elongation
(2” or 4D gl)
35 % (min)
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