Stainless Steel SMO 254 Pipes
SMO 254 is a high-alloy austenitic stainless steel grade, also known as UNS S31254 or 6% molybdenum steel. It is designed for aggressive corrosive environments and contains about 20% chromium, 18% nickel, and 6.1% molybdenum, plus added nitrogen. This chemical composition offers excellent resistance to pitting, crevice corrosion, and cracking caused by chlorides. SMO 254 pipes are commonly used in marine systems, desalination plants, chemical processing, and offshore oil and gas applications, where standard stainless steels do not last long.
SMO 254 Stainless Steel Pipe Price
The pipe type, size, surface finish, and order quantity all affect the cost of ASTM A312 UNS S31254 pipes in India. The three primary pricing criteria that buyers should consider before sourcing are mentioned below.
Approximate price range
SMO 254 seamless pipes in India are priced between INR 2,500 and INR 6,500 per kg, depending on the outer diameter and wall thickness. Welded and EFW types are comparatively lower; the costing ranges from about INR 1,800 to 4,500 per kg.
Cost per foot (approx.)
A standard 1-inch SMO 254 seamless pipe (Schedule 40) costs approximately INR 400 to INR 900 per foot. Larger diameters and heavy-wall schedules carry a proportionally higher cost.
Factors affecting price
Raw material cost: Nickel and molybdenum are the two dominant alloying elements. Global fluctuations in nickel prices directly impact the final pipe cost.
- Pipe type and finish: Seamless pipes are more expensive than welded pipes. Pipes with polished or electropolished finishes cost more than standard mill-finish pipes.
- Order volume and specifications: Ordering in bulk reduces the cost per kilogram. Custom sizes, precise measurements, and inspection checks make the pipes more expensive.
Available Types of SMO 254 Stainless Steel Pipes
SMO 254 pipes are available in 7 manufacturing forms to meet varying pressure, structural, and application requirements.
- SS SMO 254 EFW pipes
- SS SMO 254 seamless pipes
- SS SMO 254 welded pipes
- SS SMO 254 round pipes
- SS SMO 254 ERW pipes
- SS SMO 254 custom pipes
- SS SMO 254 thick pipes
Stainless Steel SMO 254 Pipe Specifications
The table below covers the standards, size range, and surface finish options for SMO 254 stainless steel pipes. Confirm exact specifications with your supplier based on application requirements.
|
Parameter |
Details |
|
Standards & Grades |
ASTM A312, ASTM A813, ASTM A814, ASTM A249, ASTM A269, ASTM A240, ASTM A182 (F44), ASTM A469 |
|
Outer Diameter (OD) |
6.35 mm to 610 mm |
|
Pipe Schedules |
SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160, XXS |
|
Wall Thickness |
0.5 mm to 50 mm |
|
Forms Available |
Seamless, Welded, EFW, ERW, Custom |
|
Surface Finish |
2B, No. 4, BA, Mirror, Pickled, Electropolished |
|
Length |
Single random (SRL): up to 6 m; Double random (DRL): up to 12 m |
Chemical Composition of SMO 254 Stainless Steel Pipes
The key elements below define the corrosion resistance and structural strength of SMO 254. The high molybdenum content (6.1%) combined with nitrogen is what separates this grade from standard austenitic steels.
|
Element |
Content (%) |
|
Iron (Fe) |
55.69 |
|
Chromium (Cr) |
20 |
|
Nickel (Ni) |
18 |
|
Molybdenum (Mo) |
6.1 |
|
Nitrogen (N) |
0.20 |
|
Carbon (C) |
0.010 max |
Mechanical Properties Of Stainless Steel SMO 254 Pipes
The 7 mechanical property values below define the structural performance of SMO 254 pipes under load and temperature. These values are measured under standard test conditions per ASTM specifications.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
680 MPa |
98,600 psi |
|
Yield strength |
300 MPa |
43,500 psi |
|
Modulus of elasticity |
195 GPa |
28,300 ksi |
|
Shear modulus |
75 GPa |
10,900 ksi |
|
Poisson's ratio |
0.30 |
0.30 |
|
Elongation at break |
50% |
50% |
|
Hardness, Brinell |
210 |
210 |
Physical Properties Of Stainless Steel SMO 254 Pipes
The physical properties below define the thermal and structural behaviour of SMO 254 pipes. These values remain consistent across standard production lots.
|
Properties |
Metric |
Imperial |
|
Density |
8 g/cm³ |
0.289 lb/in³ |
254 SMO Pipe Size Chart
The following table presents the sizes of 254 SMO pipes.
|
Nominal Thickness (in) MM |
Pipe Size (in) |
Transverse Areas (in2) MM2 |
Diameter (in) MM |
Volume (ft3/ft) |
Number of Threads per inch of Screw |
Weight |
Length of Pipe (ft per sq.0 foot of surface) |
|||||
|
Internal |
External |
Steel |
Internal |
External |
(kg/m) |
(lb/ft) |
Internal Surface (ft) |
External Surface (ft) |
||||
|
0.007 |
1/8 |
0.006 |
0.013 |
0.007 |
0.027 |
0.0405 |
0.00004 |
27 |
0.036 |
0.024 |
14.020 |
9.043 |
|
0.009 |
¼ |
0.010 |
0.023 |
0.013 |
0.036 |
0.0540 |
0.00007 |
18 |
0.063 |
0.042 |
10.049 |
7.007 |
|
0.009 |
3/8 |
0.019 |
0.036 |
0.017 |
0.049 |
0.0675 |
0.00013 |
18 |
0.084 |
0.057 |
7.075 |
5.066 |
|
0.011 |
½ |
0.030 |
0.055 |
0.025 |
0.062 |
0.0840 |
0.00021 |
14 |
1.026 |
0.085 |
6.014 |
4.055 |
|
0.011 |
¾ |
0.053 |
0.087 |
0.033 |
0.082 |
1.0050 |
0.00037 |
14 |
1.068 |
1.013 |
4.064 |
3.064 |
|
0.013 |
1 |
0.086 |
1.036 |
0.049 |
1.005 |
1.0315 |
0.00060 |
11 ½ |
2.050 |
1.068 |
3.064 |
2.090 |
|
0.014 |
1 ¼ |
1.050 |
2.016 |
0.067 |
1.038 |
1.0660 |
0.00104 |
11 ½ |
3.038 |
2.027 |
2.077 |
2.030 |
|
0.015 |
1 ½ |
2.004 |
2.084 |
0.080 |
1.061 |
1.0900 |
0.00141 |
11 ½ |
4.004 |
2.072 |
2.037 |
2.001 |
|
0.015 |
2 |
3.036 |
4.043 |
1.008 |
2.007 |
2.0375 |
0.00233 |
11 ½ |
5.043 |
3.065 |
1.085 |
1.061 |
|
0.020 |
2 ½ |
4.079 |
6.049 |
1.070 |
2.047 |
2.0875 |
0.00333 |
8 |
8.062 |
5.079 |
1.055 |
1.033 |
|
0.022 |
3 |
7.039 |
9.062 |
2.023 |
3.007 |
3.0500 |
0.00513 |
8 |
11.027 |
7.058 |
1.025 |
1.009 |
|
0.023 |
3 ½ |
9.089 |
12.056 |
2.068 |
3.055 |
4.0000 |
0.00687 |
8 |
13.056 |
9.011 |
1.008 |
0.095 |
|
0.024 |
4 |
12.073 |
15.090 |
3.017 |
4.003 |
4.0500 |
0.00884 |
8 |
16.006 |
10.079 |
0.095 |
0.085 |
|
0.026 |
5 |
20.000 |
24.030 |
4.030 |
5.005 |
5.0563 |
0.01389 |
8 |
21.074 |
14.061 |
0.076 |
0.069 |
|
0.028 |
6 |
28.089 |
34.047 |
5.058 |
6.007 |
6.0625 |
0.02006 |
8 |
28.023 |
18.097 |
0.063 |
0.058 |
|
0.032 |
8 |
50.002 |
58.042 |
8.040 |
7.098 |
8.0625 |
0.03552 |
8 |
42.049 |
28.055 |
0.048 |
0.044 |
|
0.037 |
10 |
78.085 |
90.076 |
11.090 |
10.002 |
10.0750 |
0.05476 |
8 |
60.024 |
40.048 |
0.038 |
0.036 |
|
0.041 |
12 |
111.090 |
127.064 |
15.074 |
11.094 |
12.0750 |
0.07763 |
8 |
79.077 |
53.060 |
0.032 |
0.030 |
|
0.044 |
14 |
135.030 |
153.094 |
18.064 |
13.013 |
14.0000 |
0.09354 |
8 |
93.075 |
63.000 |
0.028 |
0.027 |
|
0.050 |
16 |
176.070 |
201.005 |
24.035 |
15.000 |
16.0000 |
1.02230 |
8 |
116.008 |
78.000 |
0.025 |
0.024 |
|
0.056 |
18 |
224.000 |
254.085 |
30.085 |
16.088 |
18.0000 |
1.05550 |
8 |
156.026 |
105.000 |
0.023 |
0.021 |
|
0.059 |
20 |
278.000 |
314.015 |
36.015 |
18.081 |
20.0000 |
1.09260 |
8 |
183.005 |
123.000 |
0.020 |
0.019 |
|
0.069 |
24 |
402.010 |
452.040 |
50.030 |
22.063 |
24.0000 |
2.07930 |
8 |
254.048 |
171.000 |
0.017 |
0.016 |
Alloy 254 Pipe Schedule as per ASME B36.10M or B36.19M
The table below provides details of the stainless steel SMO 254 pipe schedule chart.
|
3 1/2" IPS (4.000" O.D.) |
1/8" IPS (.405" O.D.) |
|
SCH 40, 10, 160, 80, XXH |
SCH 40, 80 |
|
4" IPS (4.500" O.D.) |
1/4" IPS (.540" O.D.) |
|
SCH 40, 10, 160, 80, XXH |
SCH 40, 10, 80 |
|
5" IPS( 5.563"O. D.) |
3/8" IPS (.675" O.D.) |
|
SCH 40, 10, 160, 80, XXH |
SCH 40, 10, 80 |
|
6" IPS (6.625" O.D.) |
1/2" IPS (.840" O.D.) |
|
SCH 10, 5, 80, 40, 160, 120 XXH |
SCH 5, 40, 10, 160, 80, XXH |
|
8" IPS (8.625" O.D.) |
3/4" IPS (1.050" O.D.) |
|
SCH 10, 5, 80, 40, 160, 120 XXH |
SCH 40, 10, 160, 80, XXH |
|
10" IPS (10.750" O.D.) |
1" IPS: (1.315′ O.D.) |
|
SCH 10, 20, TRUE 80 (.500), 40, 80 (.500), |
SCH 5, 40, 10, 160, 80, XXH |
|
12" IPS (12.750" O.D.) |
1-1/4" IPS (1.660" O.D.) |
|
SCH 10, 20, (.406), 40 (.375), SCH80 (.500) |
SCH 40, 10, 160, 80, XXH |
|
14" IPS (14.000" O.D.) |
1-1/2" IPS (1.900" O.D.) |
|
SCH10(.188), SCH40(.375) |
SCH 40, 10, 160, 80, XXH |
|
16" IPS (16.000" O.D.) |
2" IPS (2.375" O.D.) |
|
SCH10(.188), SCH40(.375) |
SCH 40, 10, 160, 80, XXH |
|
18" IPS (18.000" O. D.) |
2 1/2" IPS (2.875" O.D.) |
|
SCH-40 (.375) |
SCH 40, 10, 160, 80, XXH |
|
3" IPS (3.500" O.D.) |
|
|
SCH 5, 40, 10, 160, 80, XXH |
Key Features of SS SMO 254 Pipes
SMO 254 pipes carry 8 performance advantages that make them the material of choice in high-chloride and corrosive service environments.
- Superior Corrosion Resistance
- High Strength
- Excellent Weldability and Fabrication
- High tensile and yield strength
- High Ductility and Toughness
- Low Carbon Content
- Resistance to Crevice Corrosion
Applications of Stainless Steel SMO 254 Pipes
ASTM A312 UNS S31254 pipes are used across 7 demanding industries where chloride exposure, chemical attack, and high-pressure conditions are routine.
Marine and Seawater Handling
Offshore Oil and Gas
Desalination Plants
Pulp and Paper Industry
Chemical Processing
Flue Gas Desulfurisation (FGD)
Food and Pharmaceutical
How to choose the right SS SMO 254 pipe supplier
Choosing the right source for SMO 254 pipes has a direct impact on material quality, project schedules, and long-term performance. Before placing any orders, evaluate suppliers based on the following criteria.
Evaluate the manufacturer's technical expertise
A qualified supplier has a detailed understanding of high-alloy grades such as SMO 254. Before making any final decisions, request material test reports (MTRs), mill certifications, and product-specific technical datasheets.
Check grade availability and product range
A reliable source maintains SMO 254 inventory across multiple pipe forms, such as seamless, welded, EFW, and ERW, and standard size ranges. Avoid suppliers who only source on demand and do not maintain any inventory.
Verify quality certifications and testing capabilities
Confirm that the supplier is ISO 9001 certified and can produce NDT reports, hydrostatic test results, and third-party inspection documents from SGS or BV.
Examine the strength of their raw material sourcing
SMO 254 pipes must be sourced from certified mills. Ask for mill traceability records and confirm that raw material procurement follows ASTM or equivalent international standards.
Assess customisation capabilities
If the project requires non-standard dimensions, special finishes, or short-length cuts, confirm that the supplier supports custom fabrication without extended lead times.
Review delivery timelines and supply capacity
On-time delivery is critical in industrial projects. Confirm the supplier's dispatch capacity, warehouse location, and ability to handle urgent or large-volume orders without delays.
Stainless Steel SMO 254 Pipes FAQ's
SMO 254 stainless steel pipe prices in India range from INR 1,800 to INR 6,500 per kg, depending on the pipe form, outer diameter, wall thickness, and quantity. Seamless pipes carry a higher cost than welded variants. Custom dimensions, polished finishes, and third-party inspection requirements add to the final price.
The per-kg price for SMO 254 seamless pipes in India is approximately INR 2,500 to INR 6,500. Welded and ERW types range around INR 1,800 per kg. Bulk orders reduce the per-kg rate, and market prices fluctuate based on nickel and molybdenum commodity costs.
SMO 254 is a super austenitic stainless steel grade with the UNS designation S31254. It comprises 20% chromium, 18% nickel, and 6.1% molybdenum, with 0.20 % nitrogen. This composition results in a Pitting Resistance Equivalent Number (PREN) higher than 42, which makes it one of the most corrosion-resistant stainless grades available for chloride-rich environments.
There is no material difference. Both terms refer to the same grade: the 6% molybdenum super austenitic alloy with the UNS S31254 classification. The commercial product name is 'SMO 254', while 'SS SMO 254' simply adds the 'stainless steel' prefix for clarity in technical documentation and procurement.
Alloy 254 is available in pipes, tubes, plates, sheets, flanges, fittings, bars, and fasteners. In pipe form specifically, options include seamless, welded, EFW, ERW, round, and custom-fabricated pipes.
Alloy 254 pipes are available in various wall thickness schedules ranging from SCH 5S to XXS and outer diameters ranging from 6.35 mm to 610 mm. 6 meters (single random) and 12 meters (double random) are the standard lengths. Custom lengths and non-standard measurements are available on request.
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