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SMO 254 Bars – Composition, Properties and Uses

SMO 254 Bars

Stainless steel SMO 254 bars have become one of the most popular choices in the market due to their superior physical and mechanical properties. These bars are made of a combination of chromium, molybdenum, and nitrogen, which make them highly resistant to corrosion and deformation at high temperatures. This blog post will delve into the composition, physical and mechanical properties, uses, heat treatment, and corrosion resistance of UNS S31254 Bar.

SMO 254 Bars Composition:

254 SMO Round Bar typically comprise 20% chromium, 18% nickel, 6% molybdenum, and 0.2% nitrogen. This composition makes them highly resistant to corrosion and oxidation at high temperatures.

Elements Carbon Chromium Manganese Molybdenum Nickel Nitrogen Phosphorus Silicon Sulphur
SMO 254 UNS S31254 0.02 max 19.5-20.5 1.0 max 6.0-6.5 17.5-18.5 0.18-0.22 0.03 max 0.8 max 0.01 max

SMO 254 Bars Physical Properties:

UNS S31254 Bar possess excellent physical properties, such as high thermal conductivity, good weldability, and low thermal expansion. Their melting point ranges from 1300°C to 1390°C, with a density of 8.0 g/cm³.

SMO 254 Bars Mechanical Properties:

Alloy 254 flat bar  are also known for their exceptional mechanical properties, such as high tensile strength, excellent ductility, and good impact resistance. The bars have a tensile strength of 800-1000 N/mm² and a 300-350 N/mm² yield strength.

0.2% Proof Stress (N/mm2 ) [ksi] minimum 300 [43.5]
Tensile Strength (N/mm2) [ksi] minimum 650
Elongation (%) minimum 35
Hardness (HBN) 270 max
Reduction of Cross Section Area (%) 50

SMO 254 Bars Equivalent

SMO 254 S31254 1.4547 X1CrNiMoCuN20-18-7 Z1 CNDU 20.18.06Az 2378

SMO 254 Bars Uses:

254 SMO Bar are widely used in various industries, including chemical and petrochemical, food processing, marine, and offshore oil and gas. They are used in constructing heat exchangers, pressure vessels, pipes, valves, and pumps due to their excellent corrosion resistance, high strength, and durability.

SMO 254 Bars Heat Treatment:

The heat treatment of SMO 254 Round Bar is critical to ensure optimal properties. After the bars are forged or machined, they must be annealed to relieve residual stress and enhance their ductility. The annealing temperature ranges from 1020°C to 1120°C, followed by rapid water or air cooling.

SMO 254 Bars Corrosion Resistance:

Alloy 254 flat bar resist corrosion in various environments, such as acids, brine solutions, seawater, and organic solvents. Their corrosion resistance is attributed to their composition’s molybdenum, chromium, and nitrogen, which provide a protective layer against corrosion.


A276 6mo UNS S31254 Bar are an excellent choice for industries that require high strength, durability, and corrosion resistance. Their superior physical and mechanical properties ensure optimal performance in various applications. From chemical and petrochemical to marine and offshore oil and gas applications, SMO 254 Round Bar are highly versatile and reliable. Ensure you anneal the bars after forging or machining to enhance their properties and maximize lifespan.


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