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SMO 254 Pipe – Composition, Properties and Uses

SMO 254 Pipes

If you need to work with pipes, you know just how important it is to choose the right material. SMO 254 is a high-alloy austenitic stainless steel with outstanding corrosion resistance. The alloy was created specifically for seawater and other aggressive chloride-bearing environments. This blog post looks closely at SMO 254 pipes, including their composition, physical and mechanical properties, uses, and heat treatment.

What are SMO 254 Pipes?

254 SMO Pipe are made from high-alloyed austenitic stainless steel developed for its excellent resistance to corrosion in seawater and other aggressive media. This material is highly resistant to chloride stress corrosion cracking and can be used in temperatures up to 450 degrees Celsius. Thus, they are ideal for waste heat boilers, desalination plants, and pharmaceutical equipment applications.

SMO 254 Pipe Composition:

MO 254 Rectangular Pipes is a highly alloyed gas-free weld metal comprising 6% molybdenum and 22% chromium. Copper, nitrogen, and tungsten are the other elements that comprise the remaining percentages. SMO 254 Square Pipes also contain nickel, iron, silicon, and manganese. Overall, the composition of SMO 254 pipes is designed to provide excellent resistance to corrosion and pitting.

SMO 254 Ni C Mo Mn Si Fe Cu S P Cr
17.5 – 18.5
0.02 max 6 – 6.5
1 max 0.8 max 0.5 – 1 0.01 max 0.03 max 19.5 – 20.5

SMO 254 Pipe Physical Properties:

254 SMO Seamless Pipe have excellent physical properties, making them perfect for use in challenging environments. They have a density of 8.0 g/cm³ and a melting range of 1320-1390°C. The tensile strength of UNS S31254 Pipei is 680 MPa, while the yield strength is 300 MPa. They also have a high elongation of about 50%. MO 254 Rectangular Pipes have good thermal conductivity and low thermal expansion, making them suitable for low-temperature applications.

SMO 254 Pipe Mechanical Properties:

254 SMO Stainless Steel Pipe have excellent mechanical properties, making them ideal for demanding applications. They have a high strength-to-weight ratio, which means they can withstand high stresses without being too heavy. 254 SMO Pipe are also highly ductile and have excellent toughness. They can withstand high temperatures and pressures without cracking or fracturing. These mechanical properties make SMO 254 Square Pipes suitable for critical applications such as chemical processing, oil and gas, and pulp and paper industries.

Density Melting Point Yield Strength (0.2%Offset) Tensile Strength Elongation
8.0 g/cm3 1320-1390 ℃ 300 650 35 %

SMO 254 Pipe Equivalent 

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

SMO 254 Pipe Uses:

SMO 254 Round Pipes are used in various industries due to their excellent properties. They are an ideal material for use in seawater and other chloride-bearing environments. SMO 254 pipes can be used in chemical processing plants, oil and gas refineries, pulp and paper mills, and desalination plants. They are also used in heat exchangers, pressure vessels, and piping systems where resistance to corrosion, pitting, and crevice corrosion are required.

SMO 254 Pipe Heat Treatment:

UNS S31254 Pipe can be annealed between 1038°C and 1121°C for one hour. They should then be cooled rapidly in air or water. The recommended temperature range for solution annealing of SMO 254 pipes is 1150°C to 1250°C for one hour, followed by quenching in water.

SMO 254 Pipes Corrosion Resistance:

The high concentration of molybdenum and chromium in SMO 254 Welded Pipes provides excellent resistance to corrosion and pitting. SMO 254 Square Pipes can withstand high levels of chloride and other aggressive chemicals. They are resistant to crevice corrosion and have excellent resistance to stress corrosion cracking. These properties make SMO 254 pipes ideal for use in harsh environments.



In conclusion, SMO 254 Round Pipes are an excellent choice in challenging environments. Their high-alloy composition and excellent physical and mechanical properties make them ideal for use in critical applications in various industries. SMO 254 pipes also have excellent resistance to corrosion, pitting, and crevice corrosion, which makes them an ideal material for use in harsh environments. If you need to work with pipes for critical applications, SMO 254 Welded Pipes are an excellent choice.

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