SMO 254 Pipe
Steel Pipe & Tubes has been a leading supplier of SMO 254 piping solutions.
SMO 254 / UNS S31254 Seamless & Welded Pipe Suppliers in India - ASTM A312 Stocks, Price Lists & Weight Charts
Stellar Alloys is your premier partner for SMO 254 (UNS S31254) seamless and welded pipes in India, offering comprehensive ASTM A312 stocks, competitive price lists, and detailed weight charts. Leveraging our extensive manufacturing capabilities and robust supply network, we ensure every SMO 254 pipe meets the highest standards for corrosion resistance, high‐temperature performance, and longevity. Whether your project demands seamless precision or welded efficiency, Stellar Alloys delivers tailored solutions cut to size, ready for immediate dispatch, and backed by in‐house quality testing. Our expert team works closely with you to optimize material selection, minimizing lead times and costs while maximizing reliability. Choose Stellar Alloys for unmatched technical support, on‐time delivery, and SMO 254 piping that consistently outperforms in the most aggressive environments.
What is SMO 254 Pipe?
Stainless steel grade 254 SMO represents a premium austenitic alloy engineered for exceptional impact toughness and superior resistance to chloride-induced stress corrosion, pitting, and crevice corrosion. Boasting roughly double the strength of 300-series stainless steels, 254 SMO™ often serves as a cost-effective alternative to high-nickel and titanium alloys in demanding applications. Additionally, its excellent formability makes it well-suited for complex fabrication processes.
Types & Popular Variants of SMO 254 Seamless & Welded Pipe
Understanding the available SMO 254 pipe variants ensures you select the right configuration for your application’s pressure, corrosion, and fabrication requirements.
254 SMO Tubing
254 SMO Seamless Pipe
254 SMO Pipe
SMO UNS S31254 Pipe
SA 312 UNS S31254 Pipe
ASTM A312 UNS S31254 Pipe
Equivalent Material Grades of SMO 254 Pipe & Tubes
Cross-referencing equivalent grades guarantees compatibility with global standards and simplifies material substitution without compromising performance.
| STANDARD | UNS | WERKSTOFF NR. | AFNOR | EN | JIS | SIS | GOST |
| SMO 254 | S31254 | 1.4547 | Z1 CNDU 20.18.06Az | X1CrNiMoCuN20-18-7 | – | 2378 | – |
Applications of Alloy 254 SMO Pipes
Recognizing the use-cases of SMO 254 enables precise material selection for environments requiring exceptional corrosion and stress-cracking resistance.
| Industry | Applications |
| Marine & Desalination | Seawater cooling, ballast water systems, and firefighting equipment, offering superior resistance to chloride and marine corrosion. |
| Oil & Gas Instrumentation | Precision hydraulic and instrumentation lines for pressure, flow, and level control in upstream and downstream operations. |
| Pulp & Paper Processing | Corrosion-resistant piping for chemical dosing, bleach towers, and recovery boilers in pulp and paper mills. |
| Air Pollution Control | Tubing in scrubbers and gas-cleaning systems to remove sulfur oxides, particulates, and other emissions. |
| Chemical & Petrochemical | Lines and reactor jackets for aggressive acid, alkali, and salt solutions in chemical manufacturing. |
| Power Generation | Tubing in boiler feedwater systems and condensers, where high-strength corrosion resistance is essential. |
ASTM A312 UNS S31254 Seamless Pipe Specifications
Familiarity with seamless pipe specs is crucial for verifying dimensional tolerance and mechanical criteria to ensure safe, code-compliant installations.
| Parameter | Details |
| ASTM Specification | ASTM A312/ASME SA312, ASTM A213/ASME SA213 |
| Standard | EN, DIN, AISI, AMS, SAE, DTD, DS, NF, JIS, ASME, ASTM, GB, TOCT |
| Seamless Tube Size | 3.35 mm to 101.6 mm OD |
| Seamless Pipe Size | OD 4–219 mm, wall thickness 0.05–20 mm |
| Welded Pipe Size | 5.0 to 1,219.02 mm |
| EFW Pipe Size | 5.0 to 1,219.02 mm |
| Welded Tube Size | 6.35 mm to 152 mm OD |
| BWG & SWG | 18 SWG, 14–20 SWG, 12–16 SWG, 10 SWG |
| Value-Added Services | Expansion & draw to required length/size, commercial & electrolytic polishing, machining, annealing & pickling, bending |
| Pipe Schedule | STD, SCH120, SCH20, SCH10S, SCH30, SCH40, SCH140, SCH40S, SCH160, XS, SCH60, SCH5, SCH10, SCH80, XXS |
| Tubing Wall Thickness | 0.020″–0.220″ (custom thicknesses available) |
| Finish | AP (Annealed & Pickled), BA (Bright & Annealed), No.1, 2B, Polished, MF, HL, No.4, Mirror finish, 8K |
| End | Plain, Beveled, Threaded, Screwed |
| Length | Standard & cut length, single random, double random |
| Form | Hydraulic, rectangular, coiled, square, hollow, round, straight, “U” shape, pancake coils, boiler, LSAW |
| Application | Dairy piping, oil & gas tubing, fluid tubing, boiler tubes, heat exchanger tubes |
| Type | ERW, seamless, EFW, fabricated, welded, DOM/CDW, CEW |
| Marking | Heat number (or per requirement), thickness, OD, grade, standard length |
| Specialization | Large-diameter 254 SMO pipe, nickel NW2200 capillary & odd sizes, UNS S31254 heat exchanger & condenser tubes |
| Test Certificates | Third-party inspection, manufacturer’s test certificate |
| Manufacturing Technique | Hot drawn, cold drawn, solution treated, bright annealed, hot extruded |
Complete Range of WNR 1.4547 Stainless Steel Pipe Material
Knowing the full product range clarifies available forms and finishes, aiding in comprehensive design planning and supply chain coordination
| Welded pipe and tube | Seamless pipe and tube | Fittings | Forged | Bar |
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SMO 254 Pipe Sizes & Dimensions (Inch & Metric)
Having accurate size charts for both systems prevents costly ordering errors and ensures proper fitment across global projects.
| NPS | Thickness in MM | Dia. in MM | Length | ||
| External | Internal | External Surface (ft) | Internal Surface (ft) | ||
| 1/8 | .07 | .405 | .27 | 9.43 | 14.20 |
| 3/8 | .09 | .675 | .49 | 5.66 | 7.75 |
| 1 | .13 | 1.315 | 1.05 | 2.90 | 3.64 |
| 1 ¼ | .14 | 1.660 | 1.38 | 2.30 | 2.77 |
| 2 ½ | .20 | 2.875 | 2.47 | 1.33 | 1.55 |
| 3 | .22 | 3.500 | 3.07 | 1.09 | 1.25 |
| 3 ½ | .23 | 4 | 3.55 | .95 | 1.08 |
| 5 | .26 | 5.563 | 5.05 | .69 | .76 |
| 6 | .28 | 6.625 | 6.07 | .58 | .63 |
| 10 | .37 | 1 .750 | 1 .02 | .36 | .38 |
| 12 | .41 | 12.750 | 11.94 | .30 | .32 |
| 18 | .56 | 18 | 16.88 | .21 | .23 |
| 20 | .59 | 20 | 18.81 | .19 | .20 |
| 24 | .69 | 24 | 22.63 | .16 | .17 |
SMO 254 Tube Schedule & Wall Thickness
Knowing schedule-to-thickness relationships helps engineers choose the correct wall thickness for pressure and structural requirements.
| Types | Out diameter | Sizes | Length |
| NB Sizes (in stock) | .0035” ~ 8” | 1/8″, 1/4″, 3/8″, 1/2″, 5/8″, 3/4″, 1″, 1.25″, 1.5″, 2″, 2.5″, 3″, 4″, 5″, 6″ | Cut to length |
| 254 SMO Seamless Tube (Custom Sizes) | 6.35 mm OD To 101.6 mm OD | As per requirement | Cut to length |
| 254 SMO Welded Tube (ERW Tube) (in Stock + Custom Sizes) | 6.35 mm OD To 152 mm OD | As per requirement | Cut to length |
Schedule 40 SMO 254 Pipe Dimensions
Focusing on Schedule 40 dimensions guarantees compatibility with standard piping systems and simplifies installation planning.
| Size | OD (in) | WT (in) | ID (in) | Steel Wt (lbs/ft) | Aluminum Wt (lbs/ft) |
| 1/8″ | 0.410 | 0.070 | 0.269 | 0.247 | — |
| 1/4″ | 0.540 | 0.090 | 0.364 | 0.429 | 0.147 |
| 3/8″ | 0.675 | 0.091 | 0.493 | 0.570 | 0.196 |
| 1/2″ | 0.840 | 0.109 | 0.622 | 0.850 | 0.294 |
| 3/4″ | 1.050 | 0.113 | 0.824 | 1.130 | 0.391 |
| 1″ | 1.315 | 0.133 | 1.049 | 1.680 | 0.581 |
| 1¼″ | 1.660 | 0.140 | 1.380 | 2.270 | 0.785 |
| 1½″ | 1.900 | 0.145 | 1.610 | 2.720 | 0.939 |
| 2″ | 2.375 | 0.154 | 2.067 | 3.660 | 1.260 |
| 2½″ | 2.875 | 0.203 | 2.469 | 5.800 | 2.000 |
| 3″ | 3.500 | 0.216 | 3.068 | 7.580 | 2.620 |
| 3½″ | 4.000 | 0.226 | 3.550 | 9.120 | 3.150 |
| 4″ | 4.500 | 0.237 | 4.026 | 10.800 | 3.730 |
| 5″ | 5.563 | 0.258 | 5.047 | 14.630 | 5.050 |
| 6″ | 6.625 | 0.280 | 6.065 | 18.990 | 6.560 |
| 8″ | 8.625 | 0.322 | 7.981 | 28.580 | 9.880 |
Size Schedule Chart for SMO 254 Welded & ERW Tubes
| NPS Size | OD (inches) | Available Schedules |
| 1/8″ | 0.405 | SCH 40, 80 |
| 1/4″ | 0.540 | SCH 40, 10, 80 |
| 3/8″ | 0.675 | SCH 40, 10, 80 |
| 1/2″ | 0.840 | SCH 5, 40, 10, 80, 160, XXH |
| 3/4″ | 1.050 | SCH 40, 10, 80, 160, XXH |
| 1″ | 1.315 | SCH 5, 40, 10, 80, 160, XXH |
| 1¼″ | 1.660 | SCH 40, 10, 80, 160, XXH |
| 1½″ | 1.900 | SCH 40, 10, 80, 160, XXH |
| 2″ | 2.375 | SCH 40, 10, 80, 160, XXH |
| 2½″ | 2.875 | SCH 40, 10, 80, 160, XXH |
| 3″ | 3.500 | SCH 5, 40, 10, 80, 160, XXH |
| 3½″ | 4.000 | SCH 40, 10, 80, 160, XXH |
| 4″ | 4.500 | SCH 40, 10, 80, 160, XXH |
| 5″ | 5.563 | SCH 5, 10, 40, 80, 120, 160, XXH |
| 6″ | 6.625 | SCH 5, 10, 40, 80, 120, 160, XXH |
| 8″ | 8.625 | SCH 10, 20, 40, 80 |
| 10″ | 10.750 | SCH 10, 20, 40, 80 |
| 12″ | 12.750 | SCH 10, 40 |
| 14″ | 14.000 | SCH 10, 40 |
| 16″ | 16.000 | SCH 10, 40 |
| 18″ | 18.000 | SCH 40 |
Tolerances of SMO 254 Tubing
Precise tolerance limits for SMO 254 tubing ensure reliable assembly and leak‐free performance in critical process and instrumentation systems.
| OD | ≤ .500 inch | .500 to .750 inch |
| OD Tolerance | ± .005 in. | ± .005 in. |
| Wall Tolerance | ± 15% | ± 10% |
Chemical Composition of SMO 254 Pipe (UNS S31254)
The chemical makeup of UNS S31254 defines its unique resistance to chloride stress cracking, pitting, and crevice corrosion in aggressive environments.
| Grade | Ni | C | Mo | Mn | Si | Fe | Cu | S | P | Cr |
| SMO 254 | 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 Pipe
Key mechanical characteristics such as yield strength, tensile strength, and elongation determine SMO 254’s ability to withstand pressure and mechanical loading.
| Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 8.0 g/cm3 | 1320-1390 ℃ | 300 | 650 | 35 % |
Physical Properties of SMO 254 Pipe
Essential physical parameters, including density, thermal expansion, and heat capacity, inform design decisions for temperature‐varying and weight‐sensitive applications.
| Density (lb / cu. in.) | Specific Gravity | Specific Heat (Btu/lb/Deg F – [32-212 Deg F]) | Modulus of Elasticity Tension |
| 0.287 | 7.8 | 0.119 | 29 |
Thermal Expansion of SMO 254 Pipe
Calculating SMO 254’s thermal expansion coefficient is vital for designing piping systems that tolerate dimensional shifts and maintain integrity across temperature cycles.
| Temperature,°C | Per, °C | Temperature, °F | Per °F |
| 30–100 | 16 | 86–200 | 9 |
| 30–200 | 16 | 86–400 | 9 |
| 30–300 | 16.5 | 86–600 | 9 |
| 30–400 | 16.5 | 86–800 | 9.5 |
| 30–500 | 17 | 86–1000 | 9.5 |
| 30–600 | 17 | 86–1200 | 9.5 |
| 30–700 | 17.5 | 86–1300 | 10 |
Working Pressure & Pressure Rating of SMO 254 Pipe
Accurate knowledge of SMO 254’s maximum allowable working pressure at various temperatures ensures safe and reliable operation under specified process conditions.
| Tubes O.D. (in.) | Wall Thickness of Tubew (inches) | |||||||
| .028 | .035 | .049 | .065 | .083 | .095 | .109 | .120 | |
| Working Pressure (psig) | ||||||||
| 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 | |||
Alloy 254 SMO Tube Corrosion Resistance Data
Comparative corrosion rate data for SMO 254 tubing across various aggressive media guide material selection and maintenance planning in corrosive service environments.
| Grade | Time to failure | SCC |
| 254 SMO | 425 hours | Drop evaporation method |
| SS 254 | No failure (1000 h) | boiling 25% NaCl solution |
SMO 254 Seamless Pipe Weight Chart (Per Meter / Per Kg)
This chart provides weight-per-meter and weight-per-kilogram values for SMO 254 seamless pipes, essential for structural load calculations and logistics planning.
| Avg Wall (in) | OD (in) | ID (in) | D/t Ratio | Cross-Sectional Area (in²) |
| 0.0250 | 0.0200 | 0.0210 | 12.05 | 0.00145 |
| 0.0375 | 0.0200 | 0.0335 | 18.08 | 0.00223 |
| 0.0500 | 0.0200 | 0.0460 | 25.00 | 0.00302 |
| 0.0625 | 0.0200 | 0.0585 | 31.03 | 0.00380 |
| 0.0750 | 0.0250 | 0.0694 | 26.08 | 0.00635 |
| 0.0875 | 0.0200 | 0.0835 | 43.08 | 0.00537 |
| 1.0000 | 0.0200 | 0.0944 | 35.07 | 0.00855 |
| 1.0250 | 0.0350 | 1.0180 | 35.07 | 0.01336 |
| 1.0500 | 0.0350 | 1.0430 | 42.09 | 0.01611 |
| 1.0750 | 0.0350 | 1.0680 | 50.00 | 0.01886 |
| 2.0000 | 0.0350 | 1.0930 | 57.01 | 0.02161 |
Heat Treatment Guidelines for UNS S31254 Pipes
The tubing is supplied in a solution-annealed condition; should any additional heat treatment be required after further fabrication, the following procedures are recommended.
| Solution annealing | |||
| 1150 to 1200°C | quenching in water | 1130°C | Q in air/water |
| 2100 to 2190°F | 2060°F | ||
Filler Materials for SMO 254
Approved filler metals compatible with SMO 254 ensure weld integrity, corrosion resistance, and mechanical strength in welded joints.
- MIG/GMAW/ TIG/GTAW welding
- AWS A5.14 ERNiCrMo-3
- AWS A5.14 ERNiCrMo-13
- MMA/SMAW welding
- AWS A5.11 ENiCrMo-13
- AWS A5.11 ENiCrMo-3
Testing of SMO 254 Pipes
Comprehensive testing protocols verify chemical composition, mechanical properties, and corrosion resistance to guarantee quality and compliance.
- Macro Test
- Micro Test
- Chemical Test
- Flaring Test
- PMI Test
- Stress Corrosion Cracking
- Pitting Corrosion
- IGC Test
- Hardness Test
- Mechanical test
- Flattening Test
Price List & Stock Availability of SMO 254 Pipe in India
Stay informed with the latest price listings and current stock availability of SMO 254 pipes in India to ensure timely procurement and project continuity. For more price details, contact us.
| 254 SMO Pipe Price | Origin | Price (per kg) | Others | ||
| in INR | in USD | in Euro | |||
| 254 SMO Pipe Price in USA | Rs 1600/- | $24 | €20 | Fix Length | |
| 254 SMO Pipe Price in India | Indian | Rs 1200/- | $17 | €14 | Cut to Size |
| 254 SMO Pipe Price in UK / Europe | European | Rs 1500/- | $22 | €19 | Fix Length |
| 254 SMO Pipe Price in Japan | Japanese | Rs 1400/- | $21 | €18 | Fix Length |
Why Choose Stellar Alloys for SMO 254 Pipe & Tubes?
Stellar Alloys is a trusted leader in delivering premium SMO 254 pipes and tubes, renowned for meeting stringent global standards with unmatched quality. Offering extensive manufacturing expertise, competitive pricing, and timely delivery, they provide tailored solutions tailored to your project needs. Robust quality control and expert technical support ensure durability, reliability, and performance in highly corrosive and demanding industrial environments. Choose Stellar Alloys for dependable SMO 254 materials that excel under extreme conditions.
Frequently Asked Questions About SMO 254 Pipe & Tubes
254 SMO is a high-end super austenitic stainless steel alloy with low carbon, high molybdenum, and nitrogen content. It offers excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, making it ideal for harsh environments.
An SMO pipe is made from a high-performance stainless steel alloy rich in chromium, molybdenum, and nitrogen, known for superior strength, corrosion resistance, and durability in corrosive environments such as marine and chemical processing.
254 SMO is equivalent to UNS S31254, ASTM A240/A312, EN 1.4547, and other international standards, frequently used where high corrosion resistance is required, substituting some high-nickel or titanium alloys.
254 SMO has higher molybdenum and nitrogen content than SS316, providing superior chloride stress corrosion resistance, greater tensile strength, and improved toughness at low temperatures, making it more suitable for highly corrosive environments.
