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The Performance that the Slewing Bearing Material Should Have


2023-07-06 19:13:18

Friction Compatibility

The performance of preventing adhesion and forming boundary lubrication when the shaft diameter is in direct contact with the bearing bush. The material factors that affect the friction compatibility of friction pairs are:
(1) The degree of difficulty of forming alloys in the metallurgy of secondary materials
(2) Affinity between materials and lubricants.
(3) The friction coefficient of the secondary material in the non-lubricated state.
(4) The microstructure of the material.
(5) The thermal conductivity of the material.
(6) The size of the surface energy of the material and the characteristics of the oxide film

Wear Resistance

The ability of the secondary material to resist wear. Under the specified wear conditions, the wear resistance is expressed by the wear rate or the wear degree or the reciprocal of the wear amount.


During the running-in process of the shaft diameter and the bearing pad, the machining error, coaxiality error, and surface roughness parameter values of the shaft diameter and the bearing pad are reduced to make the contact uniform, thereby reducing the friction and wear rate.


The ability of the material to allow foreign hard particles in the lubricant to be clamped and prevent scratches or (and) abrasive wear. For metal materials, those with low hardness and low modulus of elasticity have good clamping properties, while non-metallic materials have good clamping properties. Not necessarily such as carbon graphite, which has a lower modulus of elasticity, but poor clamping properties. Sliding bearings usually use softer materials and harder materials to form friction webs, and generally use softer materials as bearing bushes.

Good Dimensional Stability

Rolling bearings are precision mechanical parts, and their precision is calculated in microns. During long-term storage and use, changes in the internal structure or stress will cause changes in the size of the bearing, resulting in the loss of precision of the bearing. Therefore, in order to ensure the dimensional accuracy of the bearing, the bearing steel should have good dimensional stability.

Friction Compliance

The material compensates the initial poor fit of the sliding friction surface and the deflection performance of the shaft by the elastoplastic deformation of the surface layer. Materials with a low modulus of elasticity are more compliant.

Corrosion Resistance

The ability of a material to resist corrosion. When the lubricating oil is used in the atmosphere, it will gradually oxidize to produce acidic substances, and most lubricating oils also contain extreme pressure additives, which will corrode the bearing material. Therefore, the bearing material needs to have corrosion resistance.

Fatigue Resistance

The ability of a material to resist fatigue failure under cyclic loading. At the service temperature, the strength, hardness, impact strength and uniformity of the bearing material are very important for fatigue resistance. Good wear-in and clamping properties, usually poor fatigue resistance

Cavitation Resistance

When the solid is moving relative to the liquid, when the bubbles in the liquid break near the solid surface, local impact high pressure or local high temperature will be generated, which will lead to cavitation wear. The ability of a material to resist cavitation wear is called cavitation resistance. Generally, copper-lead alloys, tin-based bearing alloys and aluminum-zinc-silicon alloys have better cavitation resistance.

Compressive Strength

The ability to withstand unidirectional loads without being crushed or changing dimensions.

Good Rust Resistance

Rolling bearings have many production processes and a long production cycle. Some semi-finished or finished parts need to be stored for a long time before assembly. Therefore, bearing parts are prone to certain corrosion during the production process or in the storage of finished products, especially in humid air. Therefore, the bearing steel is required to have good rust resistance.

Good Process Performance

During the production process of rolling bearings, its parts have to go through multiple cold and hot processing processes. This requires that the bearing steel should have good process properties, such as cold and hot forming properties, cutting and grinding costs and high-quality production needs. Machining performance and heat treatment performance, etc., to adapt to rolling bearings in large quantities, high efficiency, low.

Choose materials according to working conditions

Bearings for passenger cars are subject to variable stress due to their high working intensity. Therefore, the material of the bearing is required to have high impact resistance and high rigidity, and the inner and outer raceways and rolling elements must be operated for a long time under heavy loads, so the material of the bearing needs to be high. hardness and wear resistance.

How to find a trustworthy Slewing Bearing supplier?

When it comes to choosing slewing bearing suppliers, procurement departments rely on a number of qualitative, quantitative, subjective and objective criteria.

1. Supplier cost

Probably the most obvious – but equally important – factor to take into consideration when looking for new suppliers, is cost.

Of course, you’ll have a figure in mind as you’ll know which products you’re looking for, and how much you’re willing to pay. Even so, prices between suppliers can vary, so it’s important to shop around and see who offers the best deal. For instance, some suppliers may offer discounts on bulk-buying; or others may offset higher costs with better quality products.

You should weigh up all of the options when it comes to costs, before deciding which supplier is best in that respect.

2. Quality

There’s often a correlation between cost and quality: the more expensive the product, the better the quality. Regardless of price, there is still a predetermined, agreed level of quality, and you want to be sure that your expectations are met.

After all, the last thing you want to do is market your products as high-end, when your supplier sends you something completely different.

Quality doesn’t just refer to the physical product itself, but its associated aspects too. Are the products packaged adequately, protecting them in transit? Are they labelled correctly? Speak with potential suppliers to ensure that you’re fully aware of what they will offer you – you don’t want to sign a contract and then be disappointed.

3. Reliability and previous experience

It’s important to remember that when choosing a supplier, you’re essentially entering into a long-term relationship with them. It’s similar to hiring a new recruit – you’ll want to see references.

Don’t be afraid to ask for them: it makes sense that you would want to hear from businesses who have worked with specific suppliers in the past, as they can give you an honest account of what the partnership was like, and list any good or bad points.

If you’re deciding between two suppliers, references can make all the difference when deciding who to choose.

Your chosen supplier will directly reflect upon your business. If they send over a batch of products two weeks late, the customer who ordered that product will blame you, not your supplier.

4. Shared culture

Expectations are only met when they are clear on both sides. A good supplier relationship is built on shared cultural goals and attitudes. Speak with suppliers directly to find out how they like to work with other businesses. If you want constant communication but they prefer to just “get on with it”, then realistically, that’s not going to work.

Top-down view of people around a table on their laptops

When speaking with suppliers, whilst you’ll have questions to ask them; it’s likely they’ll have equally as many questions for you. Use this time to gauge whether your culture and expectations are similar, as you should get a good idea of whether or not the relationship will work.

5. Location

When choosing a supplier, location is a big factor to consider. If you’re a local business that has built your brand on expertise in your area, then you’ll want to focus on finding a supplier who is located nearby, and shares your values.

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