Metinox Overseas is a high grade austenitic manufacturer, supplier, and exporter of 254 SMO Pipes, produced out of UNS S31254 superaustenitic stainless steel, developed to provide uninterrupted service under extremely aggressive and chloride laden conditions. 254 SMO is a high-grade austenitic alloy with high chromium, molybdenum and nitrogen levels that provide excellent pitting and crevice corrosion resistance and stress corrosion cracking under chloride environments. The 254 SMO Pipes is used in critical applications because its high mechanical strength and better corrosion resistance are typically employed in situations when the common stainless steels cannot be used in order to provide the required conditions in chemical processing, offshore platforms, desalination plants, and oil and gas installations.
Our 254 SMO solution-annealed and pickled or bright-annealed pipes are offered in seamless and welded form that has given it a smooth surface finish and dimensionally accurate. UNS S31254 pipes can be welded easily with traditional welding techniques and their formability is excellent, although correct tools are advisable because their yield strength is greater than that of typical austenitic grades. These pipes are reliable at extreme temperatures, high pressure, and acidic conditions and hence are used in nuclear fuel reprocessing, acid production, pollution control systems as well as heat exchangers. Metinox Overseas provides 254 SMO Pipes in a large assortment of sizes, schedules, and custom lengths, which provide the same quality, full traceability, and global supply.
Table of Contents
- Specifications of 254 SMO Pipe
- Alloy 254 SMO Pipe Chemical Composition
- ASME SA312 SMO 254 Pipes Mechanical Properties
- SMO 254 Seamless Pipe Physical Properties
- 254 SMO SS Pipes Equivalent Grades
- Pressure Rating of UNS S31254 Pipe
- Stainless Steel 254 SMO Square Pipe Weight Chart
- UNS S31254 Pipe Temperature Chart
- Manufacturing Process of 254 SMO Pipes
- Applications & Usage of 254 SMO Pipes
- Frequently Asked Questions (FAQs)
Specifications of 254 SMO Pipe
| Parameter | Details |
| Dimensions | ASTM, ASME, and API |
| Specifications | ASTM A409, ASME SA409 / ASTM A312, ASME SA312 / ASTM A358, ASME SA358 |
| Size Range | 1/2" NB � 24" NB |
| Manufacturing Type | Seamless / Welded / ERW |
| Schedules | SCH 20, SCH 30, SCH 40, STD, SCH 80, XS, SCH 60, SCH 120, SCH 140, SCH 160, XXS |
| Specialization | Large Diameter Size |
| Outer Diameter (OD) | 21.3 � 1219.0 mm |
| Wall Thickness | 1.5 � 25.4 mm |
| Lengths | Up to 12 mm OR Single Random, Double Random & Cut Length |
| Form | Round Pipe, Square Pipe, Rectangular Pipe |
Alloy 254 SMO Pipe Chemical Composition
| Grade | %C | %Ni | %Si | %N | %S | %Mn | %P | %Cr | %Cu | %Mo | %Fe | |
| SS 254 SMO | min. | � | 17.5 | � | 0.18 | � | � | � | 19.5 | 0.50 | 6.00 | Balance |
| max. | 0.02 | 18.5 | 0.70 | 0.22 | 0.01 | 1.00 | 0.03 | 20.5 | 1.00 | 6.50 | Balance |
ASME SA312 SMO 254 Pipes Mechanical Properties
| Grade | Tensile Strength Rm? (MPa) min. | Yield Strength 0.2% Proof (MPa) min. | Elongation (% in 50 mm) min. | Rockwell B Hardness (HRB) max. | Brinell Hardness (HB) max. |
| 254 SMO | 650 | 300 | 35 | 96 | 223 |
SMO 254 Seamless Pipe Physical Properties
| Material Grade | Density (g/cm3) | Yield Strength (0.2% Offset) | Tensile Strength (Min) | Melting Point Range | Elongation (Min) |
| SMO 254 | 8.0 | 300 MPa (43.5 KSI) | 650 MPa (94.2 KSI) | 1320�C � 1390�C | 35% |
254 SMO SS Pipes Equivalent Grades
| Grade | UNS Number | Werkstoff Nr. | EN Designation |
| 254 SMO� | S31254 | 1.4547 | X1CrNiMoCuN20-18-7 |
Pressure Rating of UNS S31254 Pipe
| Tube O.D. (in.) | .028" | .035" | .049" | .065" | .083" | .095" | .109" | .120" |
| 1/8" | 7900 | 10100 | � | � | � | � | � | � |
| 1/4" | 3700 | 4800 | 7000 | 9500 | � | � | � | � |
| 5/16" | � | 3700 | 5400 | 7300 | � | � | � | � |
| 3/8" | � | 3100 | 4400 | 6100 | � | � | � | � |
| 1/2" | � | 2300 | 3200 | 4400 | � | � | � | � |
| 3/4" | � | � | 2200 | 3000 | 4000 | 4600 | � | � |
| 1" | � | � | � | 2200 | 2900 | 3400 | 3900 | 4300 |
Stainless Steel 254 SMO Square Pipe Weight Chart
| Nominal Size (NPS) | Outside Diameter (O.D.) | Schedule (Sch) | Wall Thickness | Weight (kg/m) | Weight (lb/ft) |
| 1/2" | 21.3 mm (0.840") | 40 | 2.77 mm (0.109") | 1.27 | 0.85 |
| 3/4" | 26.7 mm (1.050") | 40 | 2.87 mm (0.113") | 1.69 | 1.13 |
| 1" | 33.4 mm (1.315") | 40 | 3.38 mm (0.133") | 2.50 | 1.68 |
| 1 1/4" | 42.2 mm (1.660") | 40 | 3.56 mm (0.140") | 3.39 | 2.27 |
| 1 1/2" | 48.3 mm (1.900") | 40 | 3.68 mm (0.145") | 4.05 | 2.72 |
| 2" | 60.3 mm (2.375") | 40 | 3.91 mm (0.154") | 5.44 | 3.65 |
| 2 1/2" | 73.0 mm (2.875") | 40 | 5.16 mm (0.203") | 8.63 | 5.79 |
| 3" | 88.9 mm (3.500") | 40 | 5.49 mm (0.216") | 11.29 | 7.58 |
| 4" | 114.3 mm (4.500") | 40 | 6.02 mm (0.237") | 16.07 | 10.79 |
| 6" | 168.3 mm (6.625") | 40 | 7.11 mm (0.280") | 28.26 | 18.97 |
| 8" | 219.1 mm (8.625") | 40 | 8.18 mm (0.322") | 42.55 | 28.55 |
| 12" | 323.8 mm (12.75") | STD | 9.53 mm (0.375") | 73.81 | 49.56 |
| 24" | 610.0 mm (24.00") | STD | 9.53 mm (0.375") | 141.12 | 94.71 |
| 30" | 762.0 mm (30.00") | STD | 9.53 mm (0.375") | 176.65 | 118.61 |
UNS S31254 Pipe Temperature Chart
| Temperature (�C) | Rp0.2? (MPa) | Rp1.0? (MPa) |
| 100 | 230 | 270 |
| 200 | 190 | 225 |
| 300 | 170 | 200 |
| 400 | 160 | 190 |
| 500 | 148 | 180 |
Manufacturing Process of 254 SMO Pipes
The production of 254 SMO Pipes uses advanced metallurgical levels of control and precision forming to provide unprecedented levels of corrosion resistance, high mechanical strength, excellent thermal stability and long service life in very aggressive chemical and marine environments.
- Raw Materials
The alloying components of iron, chromium and nickel are chosen with high levels of purity and meticulously matched with molybdenum and nitrogen additions to guarantee exceptional pitting, crevice corrosion, stress corrosion cracking and chloride saturated media. - Melting & Refining Process
A refined chemical composition, low impurity level, enhanced cleanliness, and homogenous mechanical properties are attained through Electric Arc Furnace (EAF) melting with Argon Oxygen Decarburization (AOD) or Vacuum Oxygen Decarburization (VOD). - Billet Preparation
Refined ingots are forged, rolled, or extruded to refine, maximize grain structure, increase toughness and to produce sound billets that could be used to make seamless pipes or that could be used to produce plates to be used in making welded pipes. - Pipe Forming
There are 254 SMO Pipes produced in the form of seamless and welded pipes. Hot extrusion and then cold drawing or cold rolling are used to produce seamless pipes and welded pipes are made out of plates or coils with TIG or laser welding to produce strong and defect-free weld seams. - Cold Working & Sizing
Cold drawing and cold rolling are used to produce a high level of dimensional tolerances, uniformity of the wall thickness, better surface finish and enhanced mechanical strength. - Heat Treatment & Annealing
The rapid quenching is performed with solution annealing in order to remove the internal stresses, ductilization, and to provide a maximum corrosion resistance, which guarantees the stable operation under different pressure and temperature conditions. - Testing & Quality Control
The quality of 254 SMO Pipes is thoroughly checked by using ultrasonic testing, eddy current testing, hydrostatic testing, chemical analysis and dimensional checking as per ASTM, ASME, EN and other international standards.
Applications & Usage of 254 SMO Pipes
254 SMO Pipes are highly used in industries that require high resistance to corrosion, high strength, and durability in highly corrosive working environments.
- Chemical processing industry
Largely utilized in reactors, heat exchangers, condensers and process piping systems that deal with chlorides, sulfuric acid, hydrochloric acid and other aggressive chemical media. - Marine & Offshore Industry
Uses in offshore drilling platforms, seawater piping and desalination plants and marine structures because of unusual resistance to seawater corrosion, biofouling as well as stress corrosion cracking. - Oil & Gas Industry
Applied in offshore pipelines, heat exchangers and in process equipment subjected to high chloride levels, high pressure, and high temperatures in severe oil and gas conditions. - Power Generation Industry
Used in condensers, cooling water systems, heat exchangers and flue gas desulfurization units in thermal and nuclear power plants where both corrosion and erosion resistance is of the utmost importance. - Pulp & Paper Industry
Applied in bleaching facilities, digesters and chemical recovery systems in which contact with chlorides, oxidizing chemicals and high temperatures demand high-quality corrosion resistance. - Water Treatment and Desalination
Widely applied to reverse osmosis plants, brine heaters, evaporators, and sea water intake pipes where the resistance to salt water and obnoxious treatment chemicals is fundamental.
Frequently Asked Questions (FAQs)
254 SMO Pipes is a high-alloy austenitic stainless steel pipe known for excellent corrosion resistance. Its UNS designation is S31254.
254 SMO offers better resistance to pitting and crevice corrosion, while Duplex and Super Duplex provide higher strength and better resistance to stress corrosion cracking.
Yes, 254 SMO pipes are highly suitable for seawater and desalination due to its excellent resistance to chloride corrosion.
254 SMO Pipes can typically operate up to about 400�C, with pressure limits depending on pipe size, wall thickness, and design standards.
It requires proper filler metals, clean welding conditions, and solution annealing when needed to maintain corrosion resistance.
Other types of SMO 254 Pipes
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Supplier and Exporter of SMO 254 / Alloy 254 / UNS S31254 / 6MO / 1.4547 Pipes in Cities
Secunderabad, La Victoria, Ho Chi Minh City, Los Angeles, Jakarta, Istanbul, Howrah, Milan, Houston, Al Jubail, Singapore, Chandigarh, Muscat, Caracas, Coimbatore, Algiers, Doha, New York, Seoul, Ahmedabad, Jeddah, Sharjah, Montreal, Ludhiana, Thane, Baroda, Vadodara, Tehran, Chennai, Mumbai, Aberdeen, Hanoi, Cairo, Abu Dhabi, Mexico City, New Delhi, Colombo, Moscow, Calgary, Chiyoda, Faridabad, Melbourne, Pune, Visakhapatnam, Brisbane, Kuwait City, Granada, Lagos, Edmonton, Santiago, Nashik, Perth, Petaling Jaya, Navi Mumbai, Bogota, Ranchi, Rio de Janeiro, Kolkata, Sydney, Surat, Hong Kong, Rajkot, Bhopal, Bengaluru, Ulsan, Toronto, Ankara, Jamshedpur, London, Lahore, Busan, Pimpri-Chinchwad, Indore, Dubai, Thiruvananthapuram, Gurgaon, Atyrau, Kuala Lumpur, Noida, Dammam, Jaipur, Haryana, Courbevoie, Hyderabad, Riyadh, Geoje-si, Bangkok, Vung Tau, Manama, Karachi, Dallas, Madrid, Gimhae-si, Nagpur, Kanpur, Ahvaz, Ernakulam, Al Khobar, Port-of-Spain.
Supplier and Exporter of SMO 254 / UNS S31254 / 6MO / 1.4547 / Alloy 254 Pipes in Countries
Ukraine, United Arab Emirates, Denmark, Poland, Italy, Qatar, Yemen, Mongolia, Tibet, Lithuania, Venezuela, Croatia, Nepal, South Korea, Bahrain, Ireland, Zimbabwe, Malaysia, Canada, Estonia, Sri Lanka, South Africa, Namibia, Costa Rica, Mexico, Belgium, Germany, Ghana, Libya, Norway, Kazakhstan, Trinidad & Tobago,Tunisia, Argentina, Macau, Russia, Kuwait, Belarus, Bangladesh, Czech Republic, Austria, Switzerland, New Zealand, Nigeria, India, Jordan, Japan, France, Pakistan, Bhutan, Lebanon, Bolivia, Vietnam, Egypt, Turkey, Serbia, Bulgaria, Chile, United Kingdom, Gambia, Hungary, Poland, Taiwan, Singapore, Philippines, Greece, Romania, Colombia, Peru, Slovakia, China, Angola, Israel, Puerto Rico, Nigeria, Saudi Arabia, Thailand, United States, Netherlands, Finland, Gabon, Portugal, Spain, Iran, Ecuador, Australia, Mexico, Chile, Sweden, Iraq, Morocco, Kenya, Oman, Brazil, Afghanistan, Hong Kong, Indonesia, Algeria, Iran, Azerbaijan.
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