SMO 254, also known as 6Mo, is a super austenitic stainless steel alloy with high levels of chromium, molybdenum, and nitrogen. It is renowned for its exceptional corrosion resistance in aggressive environments, making it a popular choice for various industrial applications where resistance to chloride-induced stress corrosion cracking, pitting, and crevice corrosion is crucial.
One of the key characteristics of SMO 254 flat bars is their outstanding resistance to corrosion. This resistance is attributed to the alloy’s high chromium (around 20-22%) and molybdenum (approximately 6-7%) content. Chromium enhances the alloy’s resistance to oxidizing environments, such as those containing chlorides, while molybdenum provides protection against pitting and crevice corrosion. Additionally, the nitrogen content in SMO 254 promotes the formation of a stable passive layer on the surface, further enhancing its corrosion resistance properties.
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The superior corrosion resistance of SMO 254 flat bars makes them particularly suitable for use in harsh environments, such as marine applications, chemical processing plants, and oil and gas production facilities. In these industries, exposure to corrosive substances like seawater, acids, and chlorides is common, making the durability of materials a critical factor.
Specification chart for SMO 254 Flat Bars
| Property | Value |
| Alloy Name | SMO 254 (6Mo) |
| UNS Designation | S31254 |
| Density | 8.0 g/cm³ |
| Melting Range | 1320-1390°C |
| Tensile Strength (UTS) | 650-850 MPa |
| Yield Strength (0.2% offset) | ≥ 300 MPa |
| Elongation (in 50 mm) | ≥ 35% |
| Hardness (Brinell) | ≤ 270 HB |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity | 13.7 W/(m·K) at 20°C |
| Coefficient of Thermal Expansion | 11.2 µm/m°C |
| Electrical Resistivity | 0.85 µΩ·m at 20°C |
| Specific Heat Capacity | 0.45 kJ/(kg·K) at 20°C |
Chemical composition chart for SMO 254 flat bars:
| Element | Composition Range (%) |
| Chromium | 19.5 – 20.5 |
| Nickel | 17.5 – 18.5 |
| Molybdenum | 6.0 – 6.5 |
| Nitrogen | 0.18 – 0.22 |
| Iron | Balance |
| Copper | Up to 0.5 |
| Manganese | Up to 1.00 |
| Silicon | Up to 0.80 |
| Phosphorus | Up to 0.03 |
| Sulfur | Up to 0.01 |
Mechanical properties typically associated with SMO 254 flat bars:
| Property | Value |
| Tensile Strength (UTS) | 650-850 MPa |
| Yield Strength (0.2% offset) | ≥ 300 MPa |
| Elongation (in 50 mm) | ≥ 35% |
| Hardness (Brinell) | ≤ 270 HB |
Industry Application
SMO 254 Flat Bars are extensively applied in extremely corrosive conditions in the below Industries.
- Oil & Gas Industry
- Petrochemicals Plants
- Chemical Plants
- Industrial Machinery
- Power Industry
- Paper & Pulp Industry
- Food Processing Industry
- Refineries
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