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Chemical Composition Limits |
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|
Weight % |
C |
SI |
Mn |
Cr |
Ni |
Mo |
N |
S |
Others |
Others |
|
254SMO |
≤ 0.02 |
≤0.80 |
≤1.00 |
19.50-20.50 |
17.50-18.50 |
6.10-6.50 |
0.2 |
0.001 |
Cu=0.7
|
PREN = [Cr%] + 3.3 [Mo%] + 16 [N%] ≥ 42 |
Chemical Composition
Mechanical Properties
|
Material |
Tensile Strength |
0.2 % Yield Strength Rpt |
Elongation A5(%) |
|
N / mm² |
N / mm² |
||
|
254SMO |
650-850 |
300 |
≥ 35 |
Applications
· Natural and treated seawater systems, desalination plants
· Pollution control: smelters (ducting, chimneys linings...)
· Bleaching equipment for pulp and paper industries (washers)
· Chemical industries: chloride containing media; phosphoric acid, sulphury acid - Fine chemical production
- Oil & Gas Exploration
- Petrochemicals and Refineries
- Fertilizer Plants
- Chemical Industries
- Thermal, Nuclear and Solar Power Plants
- Atomic Energy
- Desalination Plants
- Aerospace
- Defence
- Pharmaceutical
- Food and Dairy
- Automobile
- Sugar
- Paper Industries
- Marine
- Cross Country Pipe Line for Gas & Water
- Pipes for Engineering purpose
Material Summary
254SMO is a 18% Ni, 20% Cr, 6% Mo super austenitic stainless-steel grade with 0.2% nitrogen additions, particularly designed to be cost effective. The 18% nickel and 0.7% copper additions combined with the chromium and molybdenum additions enhance the performance of the steel in many corrosive solutions encountered for example in chemical and petrochemical processes or chloride containing solutions.
The alloy is also seawater resistant and has extensively been used in offshore applications (It is not recommended for use in stagnant seawater applications with temperatures higher than 30°C (86°F).
Alloy 254 SMO is a 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.
