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Model No: UNS S31254
UNS S31254/254 SMO Duplex Stainless Steel Pipe
UNS S31254/254 SMO/EN 1.4547 is a high end, molybdenum and nitrogen alloyed super austenitic stainless steel with low carbon content. It is composed of 19.5-20.5% Cr, 17.0-19.0% Ni, 6.0-7.0% Mo, and traces of other elements for improved properties.
Delivery :
FOB
minimum order :
100 kilograms
Supply Ability :
5000Tonkilograms / Month
Stock Time :
7-10Day
Country of Origin :
CHINA
Quantity :
UNS S31254/254 SMO Duplex Stainless Steel Pipe
UNS S31254/254 SMO/EN 1.4547 is a high end, molybdenum and nitrogen alloyed super austenitic stainless steel with low carbon content. It is composed of 19.5-20.5% Cr, 17.0-19.0% Ni, 6.0-7.0% Mo, and traces of other elements for improved properties. Its excellent resistance to chloride pitting and crevice corrosion make it a great choice for components that must withstand high levels of chloride exposure.
UNS S31254/254 SMO is substantially stronger than the common austenitic grades, with strength nearly twice that of 300 series stainless steel. It is also characterized by high ductility and impact strength. With high levels of chromium, molybdenum, and nitrogen, 254 SMO is frequently used in high chloride environments, such as brackish water, seawater, pulp mill bleach plants, and other chloride process streams. In some applications it has even been found to be a more cost effective substitute for high nickel and titanium alloys.
Duplex Stainless 254 SMO Applications
- Due to its high levels of molybdenum and nickel, Alloy 254 SMO is frequently used in high chloride environments. Examples of applications that call for the used of Alloy 254 SMO include:
- Petroleum production
- Saltwater handling
- Food and chemical processing equipment
- Pulp mill bleach systems
- Flue gas desulphurization scrubbers
- Tall oil distillation columns
- Offshore oil & gas production equipment
- Desalination equipment
UNS S31254/254 SMO Duplex Stainless Steel Chemical Composition
| Element | Content (%) |
|---|---|
| Iron, Fe | 55.69 |
| Chromium, Cr | 20 |
| Nickel, Ni | 18 |
| Molybdenum, Mo | 6.1 |
| Nitrogen, N | 0.20 |
| Carbon, C | 0.010 |
UNS S31254/254 SMO Duplex Stainless Steel Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8 g/cm3 | 0.289 lb/in3 |
UNS S31254/254 SMO Duplex Stainless Steel Mechanical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 680 MPa | 98600 psi |
| Yield strength | 300 MPa | 43500 psi |
| Modulus of elasticity | 195 GPa | 28300 ksi |
| Shear modulus | 75 GPa | 10900 ksi |
| Poisson’s ratio | 0.30 | 0.30 |
| Elongation at break | 50 % | 50 % |
| Hardness, Brinell | 210 | 210 |
UNS S31254/254 SMO Duplex Stainless Steel Thermal Properties
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (@20-100°C/68-212°F) | 16.5 µm/m°C | 9.17 µin/in°F |
| Thermal conductivity | 14 W/mK | 97.2 BTU in/hr.ft².°F |
Machinability
Stainless steel grade 254 SMO is quite tough to machine due to the extremely high work hardening rate and lack of sulfur content; however using sharp tools, overpowered machine tools, positive feeds, good amount of lubrication, and slow speeds tend to provide good machining results.
Welding
Welding of stainless steel grade 254 SMO requires filler material without which it results in poor strength properties. Filler metals such as AWS A5.14 ERNiCrMo-3, and alloy 625 are recommended. Electrodes used in the process, have to match with AWS A5.11 ENiCrMo-12.
Annealing
Annealing of this material should be performed at 1149-1204°C (2100-2200°F), which should be followed by a water quench.
Hot Working
Forging, upsetting and other operations relating to this material can be performed at 982 - 1149°C (1800 - 2100°F). It is recommended that temperatures do not exceed this range as it would result in scaling and reduction in the workability of the material. To re-attain maximum corrosion resistant properties, it is advisable to perform post-process annealing.
Cold Working
Cold working can be carried out using all the traditional methods; however the process would be tough due to its high work hardening rate. The result will provide the material with increased strength and toughness.
Hardening
Stainless steel grade 254 SMO does not respond to heat treatment. Hardening is possible only through cold reduction.
Lork Group is a reputable manufacturer and supplier of high-quality UNS S31254/254 SMO Duplex Stainless Steel Pipe in China. Renowned for our dedication to excellence, we specialize in producing durable Duplex Stainless Steel products to meet diverse industrial needs. With a commitment to superior quality, we ensure our bars meet strict standards, making us a trusted choice in the industry.
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