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ASTM A312 UNS S31254(254SMO)/1.4547 High Mo Austenitic Stainless Steel Seamless Pipe
254SMO is a type of austenitic stainless steel that contains high levels of molybdenum, chromium, and nickel. It is also known as UNS S31254 or 1.4547. This material is popular for its exceptional resistance to corrosion caused by various types of chemicals, such as sulfuric acid, hydrochloric acid, and seawater. It has a high level of strength and toughness at both room and elevated temperatures. It is often used in industries such as chemical processing, pulp and paper, and offshore oil and gas due to its excellent durability.
Other key characteristics of ASTM A312 254SMO include:
- Excellent resistance to pitting and crevice corrosion
- High weldability and formability
- Good workability and machinability
- High strength and toughness at both ambient and elevated temperatures
- Low thermal expansion coefficient and good thermal conductivity
Overall, ASTM A312 254SMO is a highly versatile material that is suitable for a wide range of applications in industries such as chemical processing, pulp and paper, offshore oil and gas, and many others that require high levels of corrosion resistance and durability.
The equivalent Grade of A312 254SMO Stainless Steel Seamless Pipes
| UNS | EN Number | EN Name | W.Nr. | SS | AFNOR |
| S31254 | 1.4547 | X1CrNiMoCuN20-18-7 | 1.4529 | 2378 | Z1 CNDU 20.18.06AZ |
Chemical Composition of ASTM A312 254SMO Stainless Steel Seamless Pipes
| C | Si | Mn | P | S | Cr | Ni | Mo | N | Cu |
| ≤0.020 | ≤0.80 | ≤1.00 | ≤0.030 | ≤0.010 | 20 | 18 | 6.1 | 0.20 | 0.7 |
Mechanical Properties of ASTM A312 254SMO Stainless Steel Seamless Pipes
| 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 |
The physical properties of ASTM A312 254SMO Stainless Steel Seamless Pipes
| Specific Heat (0-100°C) | 500 | J.kg-1.°K-1 |
| Thermal Conductivity | 14 | W.m -1.°K-1 |
| Thermal Expansion | 16.5 | mm/m/°C |
| Modulus Elasticity | 196 | GPa |
| Electrical Resistivity | 8.5 | μohm/cm |
| Density | 8.0 | g/cm3 |
The Thermal Properties of ASTM A312 254SMO Stainless Steel Seamless Pipes
| 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 |
ASTM A312 254SMO seamless pipes are widely used in various industrial applications where high levels of corrosion resistance and durability are required. Here are some common applications of A312 254SMO seamless pipe:
1. Chemical processing: 254SMO seamless pipes are used in the manufacturing of chemical processing equipment, such as reactors, heat exchangers, and pumps, due to their excellent resistance to corrosion and high-temperature environments.
2. Oil and gas: The seamless pipe is used in offshore oil and gas exploration, production, and transportation processes. The material's resistance to corrosion makes it ideal for use in marine environments.
3. Pulp and paper: The seamless pipe can withstand the highly corrosive chemicals and fluids used in the pulp and paper manufacturing process, including bleach liquor, chlorine dioxide, and caustic soda.
4. Desalination: 254SMO seamless pipes are used in the water desalination industry for their exceptional resistance to high chloride levels in seawater.
5. Food and beverage: Due to its excellent corrosion resistance and low toxicity, the material is also used in food and beverage processing equipment such as tanks, pipelines, and fittings.
Overall, the ASTM A312 254SMO seamless pipe is highly versatile and applicable across a wide range of industries requiring high corrosion resistance and durability.
