SMO 254 fasteners are meticulously crafted from an alloy known as SMO 254 (UNS S31254), which is a high-alloy austenitic stainless steel. This alloy exhibits exceptional resistance to corrosion in various aggressive environments, including those containing chlorides and acids. SMO 254 is particularly well-suited for use in highly corrosive applications such as chemical processing, offshore and marine environments, and pulp and paper production. The material offers excellent toughness, strength, and weldability, making it an ideal choice for critical components subjected to extreme conditions.
UNS S31254 Fasteners offer versatility in shapes and sizes, ranging from bolts, screws, nuts, washers to studs. Their utility extends across various industrial applications, serving multiple functions such as joining components, sealing against gas or liquid pressure, securing items against vibration, and ensuring a robust connection without compromising structural integrity. Their adaptability and reliability make them indispensable in industries requiring dependable fastening solutions.
Furthermore, SMO 254 Fasteners find utility in areas where resistance to chloride-induced stress corrosion cracking is essential, such as seawater desalination plants and chemical processing facilities. Regardless of the application, SMO 254 fasteners offer exceptional corrosion resistance and mechanical properties, ensuring reliability and durability in demanding environments.
Standard SMO 254 Fasteners specifications as per Fasteners manufacturers.
| Material | SMO 254 (UNS S31254) |
| Specification | IS/BS/ASTM |
| Standards | ASTM A479 |
| Size | 3 mm to 200 mm |
| Length | M02 to M30 |
Each SMO 254 Fasteners have unique design each of them are used in specific applications. Some of them are mentioned below.
Note that this chart includes only some of the most common sizes of SMO 254 Bolt. There are many other sizes available as well, and some applications may require custom sizes or special configurations.
Chromium (Cr)
19.5 - 20.5%
Nickel (Ni)
17.5 - 18.5%
Molybdenum (Mo)
6.0 - 6.5%
Copper (Cu)
0.5 - 1.0%
Iron (Fe)
Bal.
Manganese (Mn)
≤1.00%
Silicon (Si)
≤0.80%
Carbon (C)
≤0.020%
Phosphorus (P)
≤0.030%
Sulfur (S)
≤0.010%
Nitrogen (N)
0.18 - 0.22%
| Density | 8.0 g/cm³ |
| Melting Point | 1320 - 1390°C (2410 - 2530°F) |
| Tensile Strength | ≥650 MPa (≥94 ksi) |
| Yield Strength (0.2%Offset) | ≥300 MPa (≥44 ksi) |
| Elongation | ≥35% |
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