There is no single material that is suitable for every component of a vibrating screen. Material selection depends on the properties of the feed, operating temperature, abrasion and corrosion conditions, impact loads, and structural requirements. The screen panels, screen frame, shafts, bearing housings, and springs may all require different materials.
Material Selection for Main Vibrating Screen Components
Screen Panels
Screen panels are in direct contact with the feed material and are usually among the most wear-prone components. The material should be selected according to the particle size, hardness, impact level, moisture content, and chemical properties of the feed.
High manganese steel: High manganese steel, such as ZGMn13, can be considered for applications involving repeated impact. Under suitable impact conditions, its surface undergoes work hardening while the underlying material retains toughness. This makes it useful for certain heavy-duty screening applications. However, its wear resistance does not necessarily provide an advantage in every low-impact or sliding-abrasion condition. The actual grade and panel design should match the operating conditions.
304 and 316L stainless steel: Stainless steel is often used when corrosion resistance, cleanability, or material-contact requirements are important. Grade 304 may be suitable for many general-purpose wet screening applications. Grade 316L contains molybdenum and generally offers better resistance to chloride-related pitting and crevice corrosion. Neither grade is suitable for every chemical environment. The feed composition, chloride concentration, temperature, and cleaning chemicals should all be considered. Stainless steel may also wear faster than hardened steel when screening highly abrasive, coarse materials.
Heat-resistant stainless steel: Screening hot materials, such as sinter, requires materials that can withstand both elevated temperatures and mechanical loads. Grades such as 310S, commonly associated with a 25Cr-20Ni composition, offer good oxidation resistance at high temperatures. However, the allowable service temperature depends on the atmosphere, exposure time, temperature cycles, and required mechanical strength. A general claim that a material can operate above 1,000°C is not sufficient for equipment selection.
Polyurethane and rubber: These materials are used for applications where impact absorption, abrasion resistance, noise reduction, or resistance to material buildup is important. Polyurethane panels are widely used in mineral processing, wet screening, and dewatering. Rubber panels are often selected for coarse materials and applications involving high impact. Their load capacity, temperature resistance, aperture design, and support requirements must be checked before use.
Screen Frame
The screen frame supports the screen panels and withstands the repeated dynamic loads generated during operation. Its material must provide sufficient strength, stiffness, and fatigue resistance.
Carbon and low-alloy structural steel: Q235 and Q355 structural steels are commonly used for screen frames. Q235 may be suitable for conventional equipment with moderate loads, while Q355 provides higher specified yield strength and can be considered for more demanding structural requirements. Plate thickness, welded joints, and frame geometry must still be designed according to the actual load.
Stainless steel: Stainless steel welded structures may be appropriate for equipment exposed to corrosive materials, frequent washing, or hygiene-related requirements. In some applications, only the material-contact parts need to be stainless steel, while the supporting frame can use carbon steel with suitable surface protection.
Fiber-reinforced plastic (FRP): FRP can be considered for selected lightweight or corrosion-resistant equipment. However, its stiffness, fatigue behavior, connection design, and resistance to vibration must be evaluated. It should not be treated as a direct replacement for steel in heavy-duty vibrating screen frames.
Shafts, Bearing Housings, and Springs
These components have different mechanical functions and should not automatically use the same material.
Eccentric shafts: 45 steel with appropriate heat treatment can be used for some conventional vibrating screen shafts. For heavier loads or more demanding operating conditions, 40Cr alloy structural steel may be considered. Shaft diameter, stress concentration, heat treatment, and fatigue strength are important design factors.
Bearing housings: Depending on the equipment design, bearing housings may be made from cast iron, cast steel, or welded structural steel. The material and construction should provide sufficient rigidity and maintain bearing alignment under vibration loads.
Springs: Springs require good elastic properties and fatigue resistance. Spring steels such as 60Si2Mn and 50CrVA may be considered according to the spring design and operating load. Ordinary 45 steel or 40Cr should not be treated as automatic substitutes for dedicated spring materials.
Key Factors Affecting Material Selection
Choosing materials based only on their nominal strength or hardness can lead to premature wear, cracking, or equipment failure. The following conditions should be evaluated before finalizing the material specification.
Feed material properties
Particle hardness, size, shape, moisture content, and chemical composition all affect component wear and corrosion. Wet, sticky materials may cause screen openings to become blocked. Highly abrasive particles can accelerate wear, while large particles falling onto the screen can create significant impact loads.
Operating loads
The screen frame, shafts, bearing housings, and support components are subjected to repeated dynamic loads. Heavy-duty equipment requires adequate structural stiffness and fatigue strength. Thin sheet metal should not be used as the main load-bearing structure unless the design has been verified for the actual operating conditions.
Operating temperature and corrosion
For high-temperature applications, material selection must account for temperature fluctuations, oxidation, and the reduction in mechanical strength at elevated temperatures. In corrosive environments, the chemical composition of the feed and cleaning agents should be checked before selecting stainless steel or other corrosion-resistant materials.
Cost and service life
A higher material grade does not always result in lower operating costs. The initial material price should be compared with expected wear life, replacement frequency, maintenance requirements, and downtime. High manganese steel, stainless steel, heat-resistant alloys, polyurethane, and rubber each have specific application ranges. Selecting the material according to actual operating conditions is more practical than using an expensive material throughout the machine.
Custom Machining for Vibrating Screen Components
Material selection is only one part of component reliability. Machining accuracy, heat treatment, welding quality, and dimensional control also affect the service performance of vibrating screen components.
Hansheng Automation provides drawing-based custom precision machining for industrial equipment components, supporting single-piece and small-batch production. Our machining work can serve applications in mining machinery, coal processing equipment, packaging machinery, filling equipment, yacht structures, and RC racing components.
