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SMO 254

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SMO 254 seamless pipes and tubes are high nickel, 6% molybdenum alloy products used in chemical processing, desalination, and marine piping where chloride attack destroys standard austenitic grades. Silver Tubes manufactures and supplies this material in India to ASTM A312 and A213 standards, in sizes up to 24 inch OD, schedule 5 to XXH, seamless and welded forms. Every heat undergoes PMI testing before drawing, holding molybdenum content within specification. This process control, backed by ready stock, cuts delivery time for petrochemical and oil and gas piping packages.

Material Overview: SMO 254

SMO 254 carries high nickel content along with 6% molybdenum, plus nitrogen and copper additions. That chemistry targets one specific failure mode, stress corrosion cracking in boiling chloride solutions. The alloy welds and fabricates without unusual difficulty. Machining runs harder, so cutting speeds and tool selection need adjustment from a 316L baseline.

Forging works in the 1300 to 1050°C range, and mill annealing runs at 2100°F. During welding, the weld pool solidifies through a mixed austenite-ferrite structure before settling fully austenitic on cooling, which is what gives the joint its resistance to hot cracking. This chemistry and structure combination is why the grade holds up in chemical processing lines, offshore gas platform process systems, and desalination equipment service conditions where standard 316 stainless would show pitting within a fraction of the time.

Contact us for mill certificates, PMI reports, or a quote against your size list.

Product qualities:
SMO 254 Pipes Tubes are having some good qualities to offer because of which it is used in applications like pharmaceuticals, gas processing, etc. Some properties are high tensile strength, good corrosion resistance, perfect finishes, etc.

We manufacture 254 SMO Seamless Pipe Tube Tubing in India for export all around the world.

254 SMO Seamless Pipe Tube Tubing

  • UNS S31254 254 SMO Buttweld Fitting
  • UNS S31254 254 SMO Forged Fitting
  • UNS S31254 254 SMO Flange
  • UNS S31254 254 SMO Outlet Fitting
  • UNS S31254 254 SMO Seamless Pipe
  • UNS S31254 254 SMO Seamless Tube
  • >UNS S31254 254 SMO Welded Pipe
  • UNS S31254 254 SMO Welded Tube
  • UNS S31254 254 SMO Sheet
  • UNS S31254 254 SMO Plate
  • UNS S31254 254 SMO Bar
  • UNS S31254 254 SMO Rod
  • UNS S31254 254 SMO Wire
  • UNS S31254 254 SMO Fasteners

Standards 254 SMO
UNS S31254

We can offer a comprehensive range of 254 SMO Seamless Pipe Tube Tubing for the right technical solution. Silver Tubes manufacture & export wide selections of 254 SMO Seamless Pipe Tube Tubing, Duplex Stainless Steel UNS S31803 Duplex UNS S32205 Pipes& Alloy 2507 (UNS S32750) super duplex stainless steel Pipes at most attractive price as per customer requirements, we can also manufacture 254 SMO Seamless Pipe Tube Tubing in ASTM/ASME/ANSI grades as per our customer budget, we enjoy the reputation supplying 254 SMO Seamless Pipe Tube Tubing at cheapest in steel industries around the globe.

254 SMO Seamless Pipe


254 SMO Seamless Pipe Tube Tubing Price


254 SMO Seamless Pipe Tube Tubing Useful Info

Specifications of SMO 254 Pipe and Tube

Alloy Common Name Related Specifications Tensile Strength Proof Stress Elongation
British European United States
Alloy 254 254SMO   1.4547 ASTM A479/A473,
/A240 S31254
F44		 655
[95]		 305
[44.2]		 35

Chemical Specification of Alloy 254

Elements C Cr Fe Mo Mn N Ni Nb P S Si V
Minimum   19.5 REMAINDER 6.0   0.18 17.5          
Maximum 0.02 20.5   6.5 1.0 0.22 18.5   0.03 0.01 0.8  

Basic Properties of Alloy 254- Mechanical Properties

0.2% Proof Stress (N/mm2 )[ksi] minimum 300 [43.5]
Ultimate Tensile Strength (N/mm2) [ksi] minimum 650[94.2]
Elongation (%) minimum 35
Hardness (HBN) 270 max
Reduction of Area(%) minimum 50

Physical Properties of Alloy 254

Density (Kg.m-3) 8000
Magnetic Permeability <1.05
Youngs Modulus (N/mm2) 200 x 103
Specific Heat 20C (J.Kg-1.K-1) 500
Electrical resistance, 20C (.O.m) 0.85
Thermal conductivity, 20C (W.m-1.K-1) 13.5

Why Choose SMO 254 Pipes and Tubes

Seawater duty exposes piping to two things at once, chloride ions and crevice geometry at flanges and gaskets. SMO 254's PREN rating, driven by 6% molybdenum and added nitrogen, keeps pitting and crevice corrosion from starting at those exact points. Chloride stress corrosion cracking, the failure mode that takes out standard 300 series stainless in boiling chloride service, does not touch this alloy under the same conditions.

Offshore platforms, desalination trains, and chemical processing lines running for twenty years or more on this material report minimal wall loss at scheduled inspections. Pipes are manufactured to ASTM A312 specifications, while tubes are made to ASTM A213 or A269, with mill certification provided for every heat. Silver Tubes stocks seamless SMO 254 across multiple schedules and diameters, which is the main reason procurement teams searching for SMO 254 tube manufacturers in India end up placing repeat orders. Whether you need an SMO 254 tube supplier for a single heat exchanger retube or an SMO 254 pipe supplier for a full offshore piping package, size availability decides the delivery date.


Applications of SMO 254 Pipes and Tubes

SMO 254 pipes and tubes are used in saltwater handling systems, flue gas desulfurization scrubbers, and tall oil distillation columns, applications where boiling chloride exposure is constant. Food processing equipment and bleaching equipment in the pulp and paper industry use the same grade, since both involve corrosive process chemistries at elevated temperatures. Petroleum production components and heat exchangers round out the more common uses, along with desalination equipment running on seawater feed. As a manufacturer, supplier, stockist, and exporter, Silver Tubes cuts pipes and tubes to custom thicknesses and lengths, which matters most when an upgrade requires a size that does not match catalogue schedules.


Frequently Asked Questions

What is SMO 254 material?

SMO 254 (UNS S31254, EN 1.4547) is a super-austenitic stainless steel with 6% molybdenum, around 18% nickel, plus nitrogen and copper additions for resistance to pitting and crevice corrosion in chloride-rich environments.

Is SMO 254 weldable?

Yes. Low carbon content (0.02% max) limits sensitization in the heat affected zone, and most fabricators weld it using GTAW with matching or nickel-alloy filler metal to avoid hot cracking.

Where is SMO 254 used?

Desalination plants, offshore gas platforms, flue gas desulfurization scrubbers, and pulp and paper bleach lines all use SMO 254 pipes and tubes where boiling chloride exposure would shorten the service life of standard 316 stainless.

What is the price of SMO 254 Pipes & Tubes?

Price depends on wall thickness, schedule, length, and the nickel-molybdenum alloy surcharge at the time of order. Share your size list with us for a quote against current mill pricing.

What is the difference between SMO 254 and duplex stainless steel?

SMO 254 is fully austenitic with 6% molybdenum and no ferrite phase, while duplex grades like 2205 carry a mixed austenite-ferrite structure with roughly 50% higher minimum yield strength, around 450 MPa against 300 MPa for SMO 254, but lower resistance to reducing acid environments.

What sizes are available for SMO 254 seamless pipes and tubes?

Seamless SMO 254 pipe runs from 1/8 inch to 24 inch NB across schedules 5S to XXS, with tube available in custom outer diameters and wall thicknesses on request.

How do I choose a reliable SMO 254 pipe supplier in India?

Ask for mill test certificates with PREN values, third-party inspection reports, and NACE MR0175 compliance if the application involves sour service; then confirm the supplier stocks the schedule you need.

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