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 %
254SMO®
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,
A988
SAE J405
C 0.020 max

Cr
19.50-20.5
Cu 0.50-1.00
Mn
1.00 max
Mo 6.00-6.50
N 0.18-0.220
Ni 17.50-18.50
P 0.030 max
S
0.010 max
Si 0.80 max
944435
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

Cr
19.0-21.0
Cu 0.80-1.50
Fe
rem
Mn 1.00 max
Mo 6.00-7.00
N 0.10-0.20
Ni 24.0-26.0
P
0.045 max
S 0.030 max
Si 0.50
max
944335
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
SAE
J405
C 0.020 max

Cr
19.0-21.0
Cu 0.50-1.5
Fe
rem
Mn 2.00 max
Mo 6.00-7.00
N 0.15-0.25
Ni 24.0-26.0
P
0.030 max
S 0.010 max
Si 0.50
max
944335

254SMO® is a registered trademark for Outokumpu

Molybdenum General Information

Molybdenum has an abundance of 1.5ppm in the earth’s crust and a silver colored metal that resembles tungsten and is often paired in the transition series in the periodic table.  However, their chemistries are distinctive.

Molybdenum has a high melting point and the pure material can be used for applications such as providing resistance heating elements in furnaces, as filament supports in electric lamps, and as electrodes for mercury vapor lamps.

Molybdenum is also used as an alloying agent in 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 maintain strength under high temperatures is why molybdenum finds most of its application at elevated temperatures. 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, air rapid oxidation can result where the oxide layer sublimes and the base metal is attacked. Because if this, 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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