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ALLOY 254 STAINLESS STEEL
ALLOY STAINLESS STEEL
254 STAINLESS STEEL
254 STAINLESS STEEL

ALLOY 254 STAINLESS STEEL

Alloy 254, which is also found under UNS S31254, is a super austenitic stainless steel that is well known for its outstanding resistance to pitting, crevice corrosion, stress cracking, and fatigue corrosion.
Product Information
Alloy 254 SMO is a very high end, molybdenum and nitrogen alloyed super austenitic stainless steel with low carbon content. It demonstrates outstanding resistance to pitting, crevice corrosion stress cracking, and corrosion fatigue uniform corrosion. Alloy 254 SMO is substantially stronger than the common austenitic grades, with strength nearly twice that of 300 series stainless steel. It is also characterized by high ductility and impact strength. With high levels of chromium, molybdenum, and nitrogen, Alloy 254 SMO is frequently used in high chloride environments, such as brackish water, seawater, pulp mill bleach plants, and other chloride process streams. In some applications it has even been found to be a more cost effective substitute for high nickel and titanium alloys.
 
Technical data

Chemical Properties

% C Cr Mn Mo N Ni P Si S
254 SMO 0.02 max min: 19.5 
max:20.0
1.00 max min: 6.0 
max: 6.5
min: 0.18 
max: 0.20
min: 17.5 
max: 18.0
0.03 max 0.80 max 1.01 max
 

Mechanical Properties

Grade Tensile Strength ksi (MPa) min Yield Strength 0.2%
Offset ksi (MPa) min
Elongation -
% in
50 mm (min.)
Hardness
(Brinell) MAX
Hardness
(Rockwell B) MAX
254 SMO Sheet & Strip 100 (690) 45 (310) 35 223 96
254 SMO Plate 95 (655) 45 (310) 35 223 96
 

254SMo

Standard

Sheet/Plate

Round bar/Wire

Pipe

Tube

ASTM A240

ASTM A276

ASTM A479

ASTM A269

ASTM A213

ASTM A312

ASTM A249

ASTM A269

ASTM A312

ASTM A358

ASTM A409

 

254 SMO is used in the following applications:

1)Equipment for handling of seawater, such as, seawater cooling, cooling water pipes, ballast water systems, firefighting systems etc.

2) Hydraulic and instrumention tubing

3) Equipment in pulp bleaching plants

4) Components in gas cleaning systems

5) Tanks and pipelines for chemicals with high halide contents

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