6% Molybdenum

Multiple Forms & Standards

6 Moly – 6% Molybdenum

UNS S31254 – UNS N08925 – UNS N08926

6 Moly Plate/Sheet
6 Moly Seamless & Welded Tube
6 Moly Seamless & Welded Pipe
6 Moly Round Bar
6 Moly Flanges F44
6 Moly Specialty Forgings

Trade NameUNS6Moly Industry SpecificationsChemical CompositionMin.Tensile (KSI)Min.Yield (KSI)Elongation %
6moly, 6MO
UNS S31254ASME SA-182, SA-240, SA-249, SA-312, SA-358, SA-409,
SA-479, SA-480, SA-813, SA-814, SA-988
ASTM A182 (F44), A193, A240, A249,
A269, A270, A276, A312, A358, A403, A409, A473, A479, A480, A813, A814,
SAE J405
C 0.020 max

Cu 0.50-1.00
1.00 max
Mo 6.00-6.50
N 0.18-0.220
Ni 17.50-18.50
P 0.030 max
0.010 max
Si 0.80 max
N/AUNS N08925
ASME SB-366,SB-625, SB-649, SB-673, SB-674
ASTM B366, B625, B649, B673, B674, B677
C 0.020 max

Cu 0.80-1.50
Mn 1.00 max
Mo 6.00-7.00
N 0.10-0.20
Ni 24.0-26.0
0.045 max
S 0.030 max
Si 0.50
Alloy 25-6MO/

Alloy 926
UNS N08926ASME SB-366, SB-625, SB-649, SB-673, SB-674, SB-677
ASTM A240, A249, A269, A270, A314, A358, A480, A688,
A959, B366, B472, B625, B649, B673, B674, B677, B804
C 0.020 max

Cu 0.50-1.5
Mn 2.00 max
Mo 6.00-7.00
N 0.15-0.25
Ni 24.0-26.0
0.030 max
S 0.010 max
Si 0.50

254SMO® is a registered trademark for Outokumpu

Molybdenum General Information

Molybdenum is a lustrous, silvery colored metal which has an abundance of 1.5 ppm in the earth’s crust. In many instances, it shows a resemblance to tungsten with which it tends to be paired in the transition series in the periodic table, but their chemistries tend to show more distinct differences than might be expected.

Molybdenum has a high melting point and applications for the pure metal take advantage of this; for example, the pure material is used as resistance heating elements in furnaces, as filament supports in electric lamps, and as electrodes for mercury vapor lamps.

Molybdenum is used as an alloying agent in certain grades of steel, Permalloys and Stellites (a series of alloys which contain varying proportions of Cr, Co, W and Mo, are very hard and are used in cutting tools and to protect surfaces subject to heavy wear).

Molybdenum Key Properties

  • Low co-efficient of thermal expansion (5.1×10-6 m/m/°C) which is about half that of most steels,
  • Good thermal conductivity,
  • Good electrical conductivity,
  • Good stiffness, greater than that of steel (Young’s Modulus 317MPa),
  • High melting point (2615°C),
  • Good hot strength,
  • Good strength and ductility at room temperature,
  • High density (10.2 g/cm3)

Molybdenum’s ability to withstand high temperatures and maintain strength under these conditions are responsible for the fact that molybdenum finds most of its application at elevated temperatures. In fact, it can work at temperatures above 1100°C (in non-oxidizing conditions), which is higher than steels and nickel-based superalloys.

When exposed to temperatures in excess of 760°C in air rapid oxidation can result. Under these conditions, the oxide layer sublimes and the base metal is attacked. Thus, molybdenum performs best in inert of vacuum environments.

Molybdenum Applications

  • Seawater Handling Equipment
  • Pulp Mill Bleach Systems
  • Tall Oil Distillation Columns and Equipment
  • Chemical Processing Equipment
  • Food Processing Equipment
  • Desalination Equipment
  • Flue Gas Desulfurization Scrubbers
  • Oil and Gas Production Equipment

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