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SMO 254 Fasteners – Composition, Properties and Uses

SMO 254 Fasteners

SMO 254 is a high-end austenitic stainless steel class that combines excellent strength, superior corrosion resistance, and robust mechanical properties. This makes it an ideal material for manufacturing fasteners in equipment and structures operating in harsh and aggressive environments. This blog post will explore the composition, physical and mechanical properties, heat treatment, corrosion resistance, and uses of SMO 254 fasteners.

What is SMO 254 Fasteners?

SMO 254 Fasteners are nickel-based stainless steels developed to have superior resistance against pitting corrosion, crevice corrosion, and stress corrosion cracking. They feature excellent creep strength at increased temperatures ranging from 850C – 1000C (1562F – 1832F). They are used in many industries, such as petroleum, power generation, and chemical processing, due to their high tensile strength and ability to withstand extreme temperatures.

SMO 254 Fasteners Composition

SMO254 Fasteners, with relatively low carbon content, are made from nickel, molybdenum, and chromium. The exact composition of SMO 254 fasteners varies depending on the manufacturer and application requirements. However, the commonly used composition ranges between 17.5-18.5% of chromium, 19.5-20.5% nickel, 6-6.5% molybdenum, and 0.2-0.3% nitrogen. Additionally, the fasteners may contain trace amounts of other elements, like copper, silicon, and sulfur. The unique composition of SMO 254 fasteners gives them excellent resistance to pitting, crevice corrosion, and stress corrosion cracking.

Grade C Mn Si S Cu Ni Cr N Mo P
SMO 254 0.02 max 1 max 0.8 max 0.01 max 0.5 – 1 17.5 – 18.5 19.5 – 20.5 0.18 – 0.22 6 – 6.5 0.03 max

SMO 254 Fasteners Physical and Mechanical Properties

SMO 254 Stainless Steel fasteners have excellent physical and mechanical properties, making them ideal for harsh and corrosive environments. The fasteners have a density of 8.0 g/cm³, and their tensile strength ranges from 650-850 MPa, with a yield strength of 300-350 MPa. Furthermore, they have excellent elongation and impact strength, which makes them resistant to deformation and breakage when subjected to stress. SMO 254 fasteners also have excellent thermal conductivity, making them ideal for high-temperature environments.

Element Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
SMO 254 8.0 g/cm3 1320-1390°C 650 300 35 %

SMO 254 Fasteners Heat Treatment

SMO 254 fasteners are typically annealed before use to reduce their hardness and improve their machinability. The annealing process involves heating the fasteners to a temperature of 1020-1100°C and holding them at that temperature for an hour or more, followed by rapid cooling in water or air. The annealing process reduces the hardness of the fasteners, making them easy to machine and form into different shapes and sizes.

SMO 254 Fasteners Corrosion Resistance

SS SMO 254 Fasteners are highly resistant to a broad range of corrosive environments due to their high nickel, molybdenum, and chromium content. They have excellent resistance to pitting and crevice corrosion in chloride and acidic environments, making them ideal for chemical processing plants, desalination plants, and marine environments. SMO 254 fasteners are also resistant to sulfuric acid, phosphoric acid, and acetic acid, making them ideal for chemical industry use.

SMO 254 Fasteners Equivalent

STANDARD WERKSTOFF NR. UNS JIS SIS GOST AFNOR EN
SMO 254 1.4547 S31254 2378 Z1 CNDU 20.18.06Az X1CrNiMoCuN20-18-7

SMO 254 Fasteners Uses

Alloy SMO 254 Fasteners are widely used in industrial applications requiring high-strength and corrosion-resistant fasteners. They are commonly used in the chemical processing industry, desalination plants, oil and gas platforms, marine vessels, and offshore drilling rigs. Additionally, they are used to construct heat exchangers, boilers, and pressure vessels that operate under high pressure and temperature. SMO 254 fasteners are also used to manufacture pumps, valves, and fittings, which require high-strength and corrosion-resistant fasteners.

Conclusion:

In conclusion, SMO 254 fasteners are an excellent choice for use in harsh and corrosive environments because of their high strength, superior corrosion resistance, and robust mechanical properties. These fasteners’ unique composition, physical and mechanical properties, heat treatment, and corrosion resistance make them ideal for use in various industrial applications. Therefore, if you are looking for a reliable and durable fastening solution for your equipment or structure, SMO 254 fasteners are an excellent choice.

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