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 designed for extreme corrosive environments. This material is particularly well-suited for applications involving high-temperature seawater, chlorides, and acidic conditions due to its exceptional corrosion resistance.

We provide a wide range of seamless and welded stainless steel pipes made from UNS S31254, commonly referred to as 254SMO or WNR 1.4547. These pipes are manufactured using premium materials and adhere to strict industry standards, making them ideal for use in seawater treatment systems, desalination plants, chemical processing units, and flue gas desulfurization systems.

The key features of UNS S31254 stainless steel pipes include:

  • Exceptional Corrosion Resistance: The alloy’s high nickel and molybdenum content provides excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, even in harsh marine environments.
  • High Strength: As a super austenitic stainless steel, S31254 offers superior mechanical strength, ensuring long-term durability and performance under demanding conditions.
  • Good Weldability: These pipes are easy to weld and fabricate, allowing for flexible installation in complex piping systems without compromising structural integrity.
  • Compliance with Industry Standards: Our S31254 pipes meet the requirements of ASTM A269, ASTM A312, and ASTM A213, ensuring consistent quality and reliability across different applications.

The manufacturing process of S31254 pipes typically begins with melting the raw material in an electric arc furnace. The molten steel is then refined using an argon-oxygen decarburization (AOD) process to remove impurities such as carbon and sulfur. After refining, the steel is cast into billets and hot-rolled into tubes, which can be either seamless or welded depending on the application requirements.

SMO 254 Seamless Pipe Specifications

Specifications ASTM A 409 / ASME SA 409, ASTM A 312 / ASME SA 312, ASTM A 358 / ASME SA 358
Dimensions ASTM, ASME, and API standards
Size 1/2” – 48”
Specialized in Large diameter sizes
Thickness 20 SWG, 18 SWG, 16 SWG, 14 SWG, 12 SWG, 10 SWG, Sch. 10, Sch. 40, Sch. 80
Type Seamless, ERW, Welded, Fabricated
Form Round, Hydraulic, etc.
Length Single random, double random, cut length
End Plain end, beveled end, threaded

SMO 254 Pipe Chemical Composition

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 Mechanical Properties

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 Pipe

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

Waterproof Backpack

Waterproof Backpack,Backpack Foldable Waterproof,Waterproof School Bags Backpack,Waterproof School Backpack

Langfang Jinzhao Sports Products Co., Ltd , https://www.jinzhaowenti.com