Types of Stainless Steel Material for Screw Conveyors

Screw conveyors are used in the food, medicine and chemical industries to use stainless steel materials, which can avoid the contamination of the conveyed materials, resist the erosion of acid and alkaline materials, and resist high temperature or low temperature. However, according to the special requirements of difficult materials and industries, The stainless steel materials of screw conveyors can be divided into many kinds. This article will introduce two different stainless steel materials of screw conveyors and their characteristics and applications.

Stainless steel screw conveyor material classification

The material of stainless steel screw conveyor can be 304, 316L, 321, and two common stainless steel materials are 304 and 316L.

304 stainless steel screw conveyor

Widely used, 304 stainless steel screw conveyors are proven to resist oxidation, corrosion and durability, are easy to clean and prevent product contamination.

316L Stainless Steel Screw Conveyor

Type 316 stainless steel is an austenitic chromium-nickel stainless steel and heat-resistant steel, which has good corrosion resistance compared to other materials when exposed to various chemical corrosives such as seawater and saline solutions. Therefore, 316L stainless steel screw conveyors are durable, easy to manufacture, clean, weld and polish, and can be much more resistant to sulfuric acid, chloride, bromide, iodide and fatty acid solutions at high temperatures. The manufacture of certain pharmaceuticals requires the use of molybdenum-containing stainless steel to avoid excessive metal contamination.

Below, we will analyze the difference between 304 and 316L stainless steel.

1. Corrosion resistance: In the case of low requirements for corrosion resistance, 304 stainless steel is better, because the unit price of 304 stainless steel is lower than that of 316 stainless steel.

3. High temperature resistance: 316L stainless steel is a material with lower carbon content in the same series of materials. Compared with 304, 316L stainless steel has stronger chemical corrosion resistance, and is more resistant to high temperature creep, stress rupture and resistance than other steels. tensile strength. Strength, when the application scene has higher requirements on corrosion resistance and heat resistance, 316l stainless steel is better.

The above are two types of screw conveyors made of different stainless steel materials. According to different material properties and application industries, suitable materials can be selected.