6 Moly - 6% Molybdenum Stainless Steels
UNS S31254 - UNS N08925 - UNS N08926 - UNS N08367
(AL6XN)
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
Alloys Now offers a large variety of products in materials
of 6% Moly (6MO) including tubing, seamless- and welded pipe,
butt weld fittings, flanges, round bar and plate products:
6% Moly Stainless Steels
"Super"-Austenitic
UNS S31254 UNS N08367(AL6XN) UNS N08925
UNS N08926
|
Tubing
Seamless |
1/16" - 2" OD |
0.016" - 0.250" WT |
3 mm - 50 mm OD |
0.5 mm - 6.0 mm WT |
Tubing
Welded |
1/2" - 6" OD |
0.035" - 0.500" WT |
12 mm - 150 mm OD |
1.0 mm - 12.0 mm WT |
Pipe
Seamless & Welded |
1/2" - 36" |
Sch 10S thru Sch 80 |
Butt Weld Fittings
Seamless & Welded |
1/2" - 36" |
Sch 10S thru Sch 80 |
Flanges
WN & Blind |
1/2" - 36" |
Sch 10S thru Sch 40
150lb & 300lb |
Round Bar |
1/2" - 12" |
Plate |
1/8" - 2" thick |
With its high levels of chromium, molybdenum,
and nitrogen, 6 Moly alloys have excellent resistance to a wide
range of chemicals and are especially suited for high chloride
environments such as brackish water, seawater, pulp mill bleach
plants and other high chloride process streams. They provide
a cost-efficient alternative to nickel-based alloys and titanium.
BENEFITS of 6% MOLY
- High resistance to pitting, crevice and general
corrosion.
- Very high resistance to chloride stress corrosion
cracking.
- 50% stronger than 300-series austenitic stainless
steels.
- Excellent impact toughness.
- Excellent workability and weldability.
6% MOLY APPLICATIONS
- Seawater handling equipment; heat exchanger,
cooling water pipes
- Pulp mill bleach systems; drums, vats and
press rolls.
- Tall oil distillation columns and equipment
- Chemical processing equipment
- Food processing equipment
- Desalination equipment
- Flue gas desulphurization scrubbers
- Oil and gas production equipment
- Tanks and pipelines for various chemicals
with high halide levels
UNS S31254 |
Carbon |
Chromium |
Copper |
Manganese |
Molybdenum |
Nitrogen |
Nickel |
Phosphourus |
Sulfur |
Silicon |
0.020
max |
19.50-20.50 |
0.50-1.00 |
1.00
max |
6.00-6.50 |
0.180-0.220 |
17.50-18.50 |
0.030
max |
0.010
max |
0.80
max |
UNS N08367 (AL6XN) |
Carbon |
Chromium |
Iron |
Manganese |
Molybdenum |
Nitrogen |
Nickel |
Phosphourus |
Sulfur |
Silicon |
0.030
max |
20.0-22.0 |
remaining |
2.00
max |
6.00-7.00 |
0.18-0.25 |
23.50-25.50 |
0.040
max |
0.030
max |
1.00
max |
UNS N08925 |
Carbon |
Chromium |
Copper |
Iron |
Manganese |
Molybdenum |
Nitrogen |
Nickel |
Phosphourus |
Sulfur |
Silicon |
0.020
max |
19.0-21.0 |
0.8-1.5 |
remaining |
1.00 max |
6.0-7.0 |
0.10-0.20 |
24.0-26.0 |
0.045
max |
0.030
max |
0.50
max |
UNS N08926 |
Carbon |
Chromium |
Copper |
Iron |
Manganese |
Molybdenum |
Nitrogen |
Nickel |
Phosphourus |
Sulfur |
Silicon |
0.020
max |
19.0-21.0 |
0.5-1.5 |
remaining |
2.00 max |
6.0-7.0 |
0.15-0.25 |
24.0-26.0 |
0.030
max |
0.010
max |
0.50
max |
Trade Name |
UNS |
6Moly Industry Specifications |
Chemical Composition |
Min.Tensile
(KSI) |
Min.Yield
(KSI) |
Elongation
% |
254 SMO |
UNS S31254 |
ASME SA-182, SA-240, SA-249, SA-312, SA-358,
SA-409, SA-479, SA-480
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 |
94 |
44 |
35 |
N/A |
UNS N08925 |
ASME 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 |
94 |
43 |
35 |
Alloy 25-6MO/
Alloy 926 |
UNS N08926 |
ASME 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 |
94 |
43 |
35 |
Moldydenum 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 (5.1x10-6 m/m/°C)
which is about half that of most steels,
Good thermal conductivity,
Good electrical conductivity,
Good stiffness, greater than that of steel (Youngs 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 |