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Stainless Steel Types And Usage In Industrial Process Fans

Stainless steel is an extensively used alloy of steel, that contains a minimum chromium content of 11% and 1.2% carbon content. This type of steel is known for its resistance against corrosion. This resistance increases in the proportion of increasing chromium content. In some varieties of stainless steel, molybdenum is also used as an ingredient. This enhances its resistance against acids.

In various applications, both industrial and domestic, stainless steel is used due to its anti-corrosion properties. Particularly, in applications that require both corrosion-resistance and strength, stainless steel is widely used. Besides, this type of steel can be easily sterilized and cleaned. In food processing plants and commercial kitchens, stainless steel is used for surface coatings.

In the manufacture of industrial stainless steel fans it is important to understand the types of steel and their properties so that the right material is used in the construction of the process fan.

Common Variants Of Stainless Steel Two of the most common variants of stainless steel are grade 304 Stainless Steel and grade 316 Stainless Steel.

Grade 304 Stainless Steel This is the most common variant of stainless steel, containing chromium (18-20%) and nickel (8-10.5%). These are the most important constitutes apart from iron. Thermally and electrically, it is less conductive, as compared to carbon steel. Besides, grade 304 Stainless Steel is non-magnetic in nature. The level of resistance to corrosion is higher. This type of steel can be easily shaped as per the needs. Other elements that are used in the alloy include silicon, manganese and carbon.

Drawback: Grade 304 Stainless Steel is susceptible to corrosion arising from saline environments, such as coastal areas and from chlorine solutions.

Common Applications: • Appliances like dishwaters and refrigerators • Processing equipment and food handling • Electrical enclosures, that are resistant to corrosion • Structures that are likely to corrode off normal carbon steel • Kitchen equipment, wheel covers, exhaust manifolds, hose clamps, piping, pressure vessels, storage tanks and stainless hardware • Structural use in aerospace and automotive • Welded or woven screens for quarrying, mining and water filtration • Bolts, nuts, screws and various fasteners • Dyeing industry • Construction materials

Grade 316 Stainless Steel Grade 316 Stainless Steel contains high chromium (16 to 18%) and nickel (10 to 14%) content. Other components include manganese, silicon and carbon. Iron forms a majority of the composition. However, a key difference between grades 304 and 316 is their chemical composition. In grade 316, the molybdenum content is significantly higher. By weight, it forms around 2 to 3 percent. As a result of high molybdenum content, this grade of steel offers a greater degree of resistance to corrosion. Besides, it is more resistant to pitting, which takes place on exposure to chloride ion solutions. At high temperatures, the strength of grade 316 stainless steel remains augmented.

This type of stainless steel is easy to fabricate. It comes with greater durability and can be welded, finished and cleaned with ease. Besides, it offers a greater degree of resistance to chlorides, sulfuric acid, bromides, fatty acids and iodides at high temperatures.

Common Applications: Grade 316 stainless steel is extensively used in marine applications.

• This kind of steel is resistant to carbide precipitation when used in high temperatures between 425 and 860 degrees Celsius. • Other applications include medical devices, refinery equipment, storage equipment and chemical processing equipment. • It is also used in textile and pulp processing equipment.

Therefore, grade 304 stainless steel would be a better choice, where cost concerns are high and the application involves a high degree of formability. In grade 316, the molybdenum content is high, which may have a negative impact on formability. The choice of stainless steel should, therefore, be made accordingly in the manufacture of industrial process fans.

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