About UNS S31254 Seamless and Welded Pipes (254 SMO, 1.4547, 254SMO)

UNS S31254, also known as Alloy 6Mo, WNR 1.4547, F44, or 254SMO, is a high-performance super austenitic stainless steel renowned for its exceptional resistance to corrosion, especially in harsh environments like seawater and acidic conditions. This material is widely used in industries where durability and performance are critical.

We provide a wide range of seamless and welded stainless steel pipes made from high-quality UNS S31254 alloy. These pipes, often referred to as 254SMO or WNR 1.4547, are manufactured under strict quality control standards to ensure reliability and longevity. They are ideal for applications in seawater treatment systems, desalination plants, chemical processing units, and flue gas desulfurization systems.

Key features of UNS S31254 stainless steel pipes include:

  • Exceptional Corrosion Resistance: Designed to withstand aggressive environments, including high chloride and acidic conditions.
  • High Strength: Made from super austenitic stainless steel, offering superior mechanical strength and durability.
  • Excellent Weldability: Easy to weld and fabricate, making it suitable for complex piping systems.
  • Compliance with Standards: Meets industry standards such as ASTM A269, ASTM A312, and ASTM A213 to guarantee quality and performance.

The manufacturing process of S31254 pipes involves several stages, starting with melting the raw materials in an electric arc furnace. The molten steel is then refined using an argon-oxygen decarburization process to remove impurities. After refining, the steel is cast into billets and hot-rolled into tubes, ensuring consistent quality and structural integrity.

SMO 254 Seamless Pipe Specifications

Standards ASTM A 409 / ASME SA 409, ASTM A 312 / ASME SA 312, ASTM A 358 / ASME SA 358
Dimensions ASTM, ASME, API
Size Range 1/2” – 48”
Specialty Large Diameter Sizes
Wall Thickness 20 SWG, 18 SWG, 16 SWG, 14 SWG, 12 SWG, 10 SWG, Sch. 10, Sch. 40, Sch. 80
Types Seamless, ERW, Welded, Fabricated
Form Round, Hydraulic, etc.
Length Single Random, Double Random, Cut Length
Ends Plain End, Beveled End, Threaded

Chemical Composition of SMO 254 Pipes

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

Mechanical Properties of SMO 254 Pipes

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

Equivalent Grades for 254 SMO Pipes

Standard UNS Werkstoff NR. AFNOR EN JIS SIS GOST
SMO 254 S31254 1.4547 Z1 CNDU 20.18.06Az X1CrNiMoCuN20-18-7 – 2378 –

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