Steel pillow block bearing housing material and use

The commonly used materials for pillow block bearing housing mainly include cast iron (grey cast iron, ductile iron), cast steel pillow block bearing housing, stainless steel pillow block bearing housing, forged steel pillow block housing, and engineering plastics. The specific selection needs to be determined based on working conditions such as load, speed, and corrosiveness. The following are detailed classification and selection criteria:
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Main material types and characteristics
Cast iron class

Gray cast iron (such as HT200): Low cost, high hardness, but poor toughness, suitable for low-speed and light load scenarios (such as ordinary mechanical transmission).
Ductile iron (such as QT400-17): It has both strength and toughness, and is suitable for medium load applications that require impact resistance.
Cast steel (such as ZG45)

Excellent strength and wear resistance, suitable for heavy-duty and high-speed working conditions (such as rolling mills and mining equipment). Compared to cast iron, cast steel has better toughness, but it is slightly more difficult to process.
Stainless steel pillow block bearing housing

Strong corrosion resistance, suitable for corrosive environments such as food processing and chemical industry, but with high cost.

Forged steel pillow block bearing housing

Better mechanical performance, commonly used in high-temperature or extreme load scenarios, such as the aerospace industry.
Engineering plastics (such as nylon, polytetrafluoroethylene)

Lightweight and corrosion-resistant, suitable for special environments such as medical devices and low-noise equipment.
Key factors for selection
Load and speed

Low speed and light load should prioritize cast iron, while heavy load and high speed should use cast steel or forged steel.
For example, the bearing seat of a rolling mill is often made of cast steel due to high loads.
Environmental adaptability

Corrosive environments require stainless steel pillow block housing or plastic materials; Forged steel pillow block housing is suitable for high temperature scenarios.

Processing and Cost

Cast iron processing is convenient and cost-effective, but its lifespan is relatively short; Although cast steel and forged steel have high costs, they have better durability.
Typical application cases
Gray cast iron pillow block housing: commonly used in low precision equipment such as ordinary machine tools and conveyor belts.
Cast pillow block housing: widely used in high load equipment such as mining machinery and heavy vehicles.
Stainless pillow block housing: suitable for cleaning in food processing production lines.