ASTM A312 UNS S31254 refers to super austenitic stainless steel pipes, also known as 254SMO or 6-Moly, produced in accordance with ASTM A312 standards. It is designed for high-performance applications in corrosive environments such as seawater, marine applications, and chemical processing. Due to its high content of chromium, molybdenum, and nitrogen, this alloy offers outstanding resistance to pitting, crevice corrosion, and chloride stress corrosion cracking.
GNEE offers ASTM A312 UNS S31254 super austenitic stainless steel pipes, which are specifically designed for use in high-corrosion environments. The pipes come in a diameter range of 1/2 inch to 24 inches (DN15-DN600) and wall thicknesses from 1.6mm to 25.4mm. Manufactured through hot extrusion and piercing processes, the pipes are available with a choice of pickled, polished, or cold-rolled surface finishes. We provide multi-specification in-stock inventory, making them the ideal choice for marine engineering, chemical processing, flue gas desulfurization, and pulp and paper industries for high-pressure fluid transport.
1. Commodity: ASTM A312 UNS S31254 Duplex Steel Tubes and Pipes
2. Process method: Cold drawn/cold rolled
3. Surface finish: Anneal/pickling/manual polish/ mechanical polish
4. Standards: ASTM A312
5. Size:
A) NPS: 1/8" to 8"
B) Schedule: 5/5S, 10/10S, 20/20S, 40/40S, 80/80S, 120/120S, 160/160S, acc. To ANSI B36.19
C) O. D.: 6 mm to 219 mm
D) W. T.: 0.5 mm to 25 mm
E) Length: Max. 20 meters
6. Delivery conditions: Annealled, Picklinged and Polished
7. packing: Seaworthy wooden cases/steel framed plywood cases/simple packaging
Thicknesss Chart of 254 SMO Stainless Steel Pipe
| 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 UNS S31254 Pipe Physical Properties
| 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 |
Composition Standard of SA 312 UNS S31254 Pipe
| SMO 254 | Ni | C | Mo | Mn | Si | Fe | Cu | S | P | Cr |
| 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 254 SMO Tubing
| Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 8.0 g/cm3 | 1320-1390 ℃ | 300 | 650 | 35 % |
GNEE has nearly 18 years of experience in seamless stainless steel tube production. Every tube undergoes dimensional, surface, PMI, eddy current, and hydrostatic tests. Only high-quality tubes are packaged and delivered to customers worldwide. Our tubing offering covers both imperial and metric sizes, with outer diameters ranging from 1.58 mm to 108 mm. Special sizes are available upon request. Straight or U-bend tubes are available in lengths up to 30 meters.
The package is packed with waterproof paper and steel strapping, which meets the standard export sea freight packaging requirements and is suitable for various modes of transportation or can be customized according to customer requirements.
SMO UNS S31254 Pipe
