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Address: Room 1703, 17th Floor, Building 5, Jinyin Modern City, Guangdian South Road, Jinshui District, Zhengzhou City, Henan Province, China.
Contact name:Vicky
Zhengzhou Huitong Pipeline Equipment Co.,Ltd. |
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High Corrosion Resistant 254SMO S31254 W.Nr.1.4547 Plate Sheet Strip Coil
1. 254SMO Plate Sheet Strip Coil General Properties
Alloy 254 SMO is a very high end, molybdenum and nitrogen alloyed super austenitic stainless steel with low carbon content. It demonstrates outstanding resistance to pitting, crevice corrosion stress cracking, and corrosion fatigue uniform corrosion. Alloy 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, Alloy 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.
2. 254SMO Plate Sheet Strip Coil 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
3. 254SMO Plate Sheet Strip CoilStandards:
ASTM/ASME: UNS S31254
EURONORM: FeMi35Cr20Cu4Mo2
DIN: 2.4660
4. 254SMO Plate Sheet Strip Coil Corrosion Resistance
Excellent resistance to pitting and crevice corrosion due to its high chromium, molybdenum, and nitrogen content
Has a very low carbon content, which means there is very little risk of carbide precipitation during heating
Possesses very good resistance in water containing chlorides, therefore, it is suitable for use in seawater as it can be exposed to it for prolonged periods without suffering from crevice corrosion
5. 254SMO Plate Sheet Strip Coil Processing
Weldability
Possesses good weldability
Should be done without pre-heating
If correctly performed, there will be no need for any subsequent heat treatment
Has low thermal conductivity and high thermal expansion so must minimize distortion of welded joint
Welding without filler metal results in poor strength properties
Machinability
High work hardening rate combined with a lack of sulfur makes it very difficult to machine
Slow speeds, sharp tools, positive feeds, over-powered machine tools, and ample lubrication offer the best results
6. 254SMO Plate Sheet Strip Coil Properties
Chemical Properties:
| % | C | Cr | Mn | Mo | N | Ni | P | Si | S |
| 254 SMO | 0.02 max | min: 19.5 max:20.0 | 1.00 max | min: 6.0 max: 6.5 | min: 0.18 max: 0.20 | min: 17.5 max: 18.0 | 0.03 max | 0.80 max | 1.01 max |
Mechanical Properties:
| Grade | Tensile Strength ksi (MPa) min | Yield Strength 0.2% Offset ksi (MPa) min | Elongation - % in 50 mm (min.) | Hardness (Brinell) MAX | Hardness (Rockwell B) MAX |
| 254 SMO Sheet & Strip | 100 (690) | 45 (310) | 35 | 223 | 96 |
| 254 SMO Plate | 95 (655) | 45 (310) | 35 | 223 | 96 |
Physical Properties:
| Grade: | Alloy 254 |
| Density | 8.0 kg/dm3 |
| Modulus of Elasticity | 195 GPa |
| Linear Expansion at 68to 212oF (20 to 100oC) | 16.5 X10-6/oC |
| Thermal Conductivity | 14 w/moC |
| Thermal Capacity | 500 J/kgoC |
| Electrical Resitivity | 0.85 μΩm |
