SMO 254 Pipe Supplier in India
Steel Pipe & Tubes has been a leading supplier of SMO 254 piping solutions.
SMO 254 pipe is a high-performing super austenitic stainless steel pipe that is manufactured under the UNS S31254, that is developed to be used in chloride hostile environments. SMO 254, which is highly molybdenum and nitrogen-based, has excellent pitting, crevice corrosion and chloride induced stress corrosion cracking resistance compared with the conventional austenitic stainless steels.
SMO 254 welded and smooth pipes are manufactured according to the ASTM A312, and are normally employed in desalination plants, seawater receiving systems, chemical processing units, and offshore installations that need high resilience to corrosion as a major consideration. High degree of mechanical strength, good weldability, and stable behavior with broad temperature range are also some of the characteristics of the alloy.
Stellar Alloys is one of the reputable suppliers of SMO 254 pipes in India that offers the pipes of various sizes, schedules and finishes that are supported by test certification and quality assurance in the extreme conditions of operations in industries.
Table of Contents
- Types & Popular Variants of SMO 254 Seamless & Welded Pipe
- ASTM A312 UNS S31254 Seamless Pipe Specifications
- Equivalent Material Grades of SMO 254 Pipe
- SMO 254 Pipe Size Chart and Dimensions
- SMO 254 Pipe Schedule and Wall Thickness
- SMO 254 Pipe Chemical Composition
- SMO 254 Pipe Mechanical Properties
- SMO 254 Pipe Weight Chart
- SMO 254 Pipe Price
- Applications of Alloy 254 SMO Pipes
- Related Links
- Frequently Asked Questions About SMO 254 Pipe & Tubes
ASTM A312 UNS S31254 Seamless and Welded Pipe Specifications
SMO 254 pipes are produced using UNS S31254, which is in line with the ASTM A312 / ASME SA312 standard used in pressure piping that involves a high level of corrosion resistance and mechanical reliability. The specifications of ASTM A312 are used to define smooth-welded austenitic stainless steel pipes to be used in high temperature and corrosive environments. With this specification, smooth and welded pipe SMO 254 is provided with a regulated chemical composition, high molybdenum and nitrogen concentration to ensure high resistance to pitting and crevice corrosion, as well as chloride induced stress corrosion cracking. Pipes are produced with tight dimensional requirements, a range of outer and inner diameter dimensions and wall thickness, and a smooth surface finish to fit engineering and fabrication conditions.
ASTM A312 UNS S31254 pipes are usually furnished in the solution annealed state and undergo strict examination, such as hydrostatic test, non-destructive test, chemical test, and mechanical test. Additional testing and inspection could also be provided to the pipes, depending on the application requirements and according to the project specifications.
These are ASTM A312 SMO 254 types of pipes that are commonly used in desalination, chemical processing systems, offshore platforms, marine piping, and other aggressive conditions where the long term performance of corrosion and pressure integrity is emphasized.
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
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 |
Equivalent Material Grades of SMO 254 Pipe
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 | – |
SMO 254 Pipe Size Chart and Dimensions
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 Pipe Schedule and 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 |
SMO 254 Pipe Chemical Composition
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 |
SMO 254 Pipe Mechanical Properties
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 % |
SMO 254 Pipe Weight Chart
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 |
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 |
ASTM A249 A312 A269 A409 A358 | ASTM A269 NFA 49-217 A213 EN 10216-5 A312 | ASTM A182 | ASTM A473 | A479 A276 EN 10088-3 |
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% |
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 |
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 | ||
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
SMO 254 Pipe Price in India
Product Type | Size Range | Price Status |
SMO 254 Seamless Pipe | Small to Medium OD | |
SMO 254 Seamless Pipe | Large OD | |
SMO 254 Welded Pipe | Standard sizes | |
SMO 254 Welded Pipe | Custom sizes | |
Cut Length Pipes | As per requirement | |
Bulk Quantity Orders | Project-based |
Note:
The estimates of the prices provided above are indicative. The real SMO 254 pipe pricing is relative to the outside diameter, wall thickness, process of manufacturing, test demands, quantity, and the current price of raw materials. Ultimate pricing is then finalized after the examination of specifications.
For the latest estimated price and stock availability, please contact us.
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. |
Why Choose Stellar Alloys for SMO 254 Pipe and Tubes?
Stellar Alloys is a trusted supplier of SMO 254 pipes and tubes that are produced in compliance with ASTM A312 UNS S31254 specifications that define corrosion-resistant and pressure piping products. We embrace industrial projects in India, the USA, and overseas markets. We provide smooth and welded SMO 254 pipes with standard control of quality and specifications.
We have a large supply scope with respect to sizes, schedules, and finishes that are backed by EN 10204 3.1 test certificates, PMI testing, and quality inspection based on project requirements. Every SMO 254 pipe is manufactured and fabricated as per stringent service requirements under desalination plants, chemical processing units, offshore platforms, and sea environments.
Having experience in export documentation and international logistics, Stellar Alloys helps to supply the SMO 254 pipes to the OEMs, EPC contractors, and the end user. During the procurement process, we are still concerned with material compliance, reliability of delivery, and technical assistance.
Related Links
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.