6Mo-N

UNS #N08367

6Mo-N is a superaustenitic stainless steel to resist pitting and crevice corrosion in acidic or neutral chloride environments. 6Mo-N contains at least 6% molybdenum and has a pitting resistance equivalent number (PREn) of at least 40. The resistance is provided by chromium, molybdenum, and nitrogen. 6Mo-N has better resistance to chloride stress corrosion cracking than 300-series stainless steel, and has suitability for sour gas applications (NACE MR0175/ISO 15156). 6Mo-N has yield strength 50% greater than 300-series austenitic stainless steel, plus good workability and weldability.

Type Analysis

  • Carbon (Maximum) 0.030
  • Phosphorus (Maximum) 0.040
  • Silicon (Maximum) 1.00
  • Nickel (Nominal) 23.5-25.5
  • Manganese (Maximum) 2.00
  • Sulfur (Maximum) 0.030
  • Chromium (Nominal) 20.0-22.0
  • Molybdenum (Nominal) 6.0-7.0
  • Iron (Nominal) Balance
  • Copper (Maximum) 0.75
  • Nitrogen (Nominal) 0.18-0.25

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Applicable Specifications

  • ASTM A479
  • ASTM B691

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