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Alloy 254 SMO (6-moly) Tubing


Alloy 6MO tubing is a high-alloy austenitic stainless steel designed for maximum resistance to pitting and crevice corrosion. The high levels of chromium, molybdenum, and nitrogen make 254 SMO (6-moly) suitable for high chloride environments such as brackish water seawater pulp mill bleach plants and other high chloride process streams. Alloy 6MO is compatible with the common austenitic stainless steels and is often used as a replacement in critical components of larger constructions where type 316L or 317L has failed by pitting, crevice attack, or chloride stress corrosion cracking. Alloy 6MO is substantially stronger than the common austenitic grades, but is also characterized by high ductility and impact strength.

Product Specifications
ASTM A213/SA213, ASTM A269, NORSOK M650, NACE MR0175

ALLOY 6MO (UNS S31254) CHEMICAL COMPOSITION % (MAX.)
Cr
Chromium
Ni
Nickel
C
Carbon
Mo
Molybdenum
Mn
Manganese
Si
Silicon
P
Phosphorous
S
Sulfur
N
Nitrogen
Cu
Copper
19.5 - 20.5 17.5 - 18.5 0.02 6.0 - 6.5 1.0 0.8 0.03 0.01 0.18 - 0.22 0.5 - 1.0

DIMENSIONAL TOLERANCES
OUTSIDE DIAMETER (OD) OD TOLERANCE WALL TOLERANCE
UP TO 1/2" +/- null" +/- null%
1/2" to 3/4" +/- .null" +/- null%
FABRICATION
Alloy 254 SMO (6-moly) has excellent weldability in addition to excellent formability which permits cold bending to very tight bending radii.
TYPICAL APPLICATIONS
Seawater Handling Equipment, Pulp Mill Bleach Systems, Oil & Gas Production Equipment, Chemical Processing Equipment, and Food Processing Equipment
SIZE RANGE
Outside Diameter (OD) Wall Thickness
1/4” - 3/4” .035" - .065"
MECHANICAL PROPERTIES
YIELD STRENGTH 0.2% OFFSET (MIN. KSI) 45
TENSILE STRENGTH (MINIMUM KSI) 98
ELONGATION (MINIMUM 2 INCHES) 35%

 Alloy 254 SMO (6-moly) Tubing
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