When planning and manufacturing the rollover bearing, the bearing material is generally selected according to the following principles.

1. Select the bearing according to the working properties of the bearing.

1. Operating temperature

Customized mountain bike headset bearings use chromium bearing steel at room temperature. Chromium bearing steel is still used when the operating temperature exceeds 1500℃ and is less than 250℃, but it must undergo special heat treatment (200℃ or 300℃ quenching is required).

2. The size of the impact load.

Bearings that bear strong impact loads generally do not use chromium bearing steel, but mostly use high-quality nitriding structural steel. . Impact-resistant tool steel or quenched and tempered structural steel.

3. Contact material

Bearings commonly used for corrosive substances must be made of corrosion-resistant steel or carbon steel with strong corrosion resistance.

2. Choose according to the structural characteristics of the bearing.

When the bearing components have complex structures, such as external mounting flanges, and are subjected to high impact loads, customized products for road bike headset bearings should use carburized steel with good processing performance; 08 and 10 low-carbon steels can be used for the outside of stamped needle roller bearings (good plasticity, suitable for cold stamping); the joint bearings used in the shaking mechanism or operating mechanism can use joint bearings GCr15.9Cr18.9Cr8Mo with excellent cold plastic deformation performance and cold extrusion of alloy tool steel.

3. Choose according to the requirements of bearing fatigue life and reliability

The price of headset bearing manufacturers is not low, so the fatigue life and stability of bearings depend on the purity and management uniformity of steel to a certain extent. In general application places, ordinary bearing steel is often smelted in acid open-hearth furnaces or alkaline electric furnaces. With the continuous improvement of smelting methods, current remelting, vacuum smelting, and bearing steel made by the above methods, new smelting methods such as ion beam furnace smelting have also improved their service life. It is suitable for bearings with special requirements for fatigue life and reliability, such as railway vehicle axle box bearings, aircraft spindle bearings, and navigation system bearings.

In addition, the processing performance of steel should also be fully considered when selecting steel grades. . Supply and domestic resource conditions, etc.