What Is Low Temperature Bearing?

Low temperature bearing is not a bearing that operates stably in high temperature environment corresponding to high temperature bearing, but refers to reducing the friction coefficient through the design of special materials and structures, so as to reduce friction heating and keep the bearing low temperature during long-term operation.

Bearings with operating temperature below – 60 ℃ are low-temperature bearings.

It is mainly used in various liquid pumps, such as liquefied natural gas pump, liquid nitrogen (hydrogen, oxygen) pump, butane pump, liquid pump for rocket and missile, spacecraft, etc.

Low Temperature Bearing

Low temperature bearing operating temperature

Bearing operating temperature is an important index of world bearing brands.

The operating temperature of low-temperature bearing reflects the material technology and processing level of bearing processing.

The measurement is mainly based on the temperature difference between the bearing outer ring and the injected cooling oil during operation.

Lower operating temperatures mean longer bearing life and higher performance.

World famous bearing manufacturers, relying on their respective advantages, strive to obtain the comparative advantages of low-temperature bearings in many fields.

Taking Timken self-aligning roller bearing as an example, after strict testing, the operating temperature of this kind of products of the company is about 15.5 degrees Celsius lower than that of similar products in the market, while that of other international well-known brands is more than 19 degrees Celsius.

Low temperature bearing product category

Low temperature bearings are mostly single row deep groove ball bearings and cylindrical roller bearings.

For the jamming phenomenon of bearing at low temperature, the external factor is the change of temperature, and the internal factor is the different thermal expansion coefficients of shaft, frame and materials.

When the temperature range is large, the shrinkage of different materials is different, resulting in smaller gap and jamming.

Therefore, for equipment with a wide range of work, including equipment used at low temperature, it is necessary to calculate the expansion coefficient of materials, and try to use materials with similar expansion coefficient, the effect will be better.

In addition, in the structural design, try to avoid using a tapered roller bearing at both ends of the shaft.

With this structure, the longer the distance between the two bearings, the greater the possibility of jamming.

If a pair of tapered bearings are installed at one end of the shaft, as the positioning of the shaft, the axial movement of the shaft is constrained, and the other end of the shaft is used together with the rolling bearing, which only limits the radial force and can move axially within a certain range with the axial temperature.

Material selection of low temperature bearing

Selection of low temperature bearing steel

Low temperature bearings are usually made of stainless steel bearing steel 9Cr18 and 9Cr18Mo, or beryllium bronze, ceramics and other materials;

Working temperature at extremely low temperature (limit temperature – 253 ℃): when the working limit temperature is required to be – 253 ℃, 6Cr14Mo material can be selected, but it must be used in vacuum environment.

Note: during the use of low-temperature bearing, pay attention to burns caused by poor lubrication, so pay attention to the selection of appropriate lubricant.

List of bearing materials and operating temperature

Steel system

Material Science

Working temperature

Remarks

High temperature bearing steel

GCr4Mo4V

≤315℃

 

GCr14Mo4

≤330°℃

Corrosion resistant medium

High speed steel

W6Mo5Cr4V2

≤430℃

 

W9Cr4V2Mo

≤450°℃

 

W18Cr4V

≤550°℃

 

High temperature carburized bearing steel

H10Cr4Mo4N

≤550°℃

For large carburized bearings

i4VRR6027

Stainless heat resistant steel

4Cr13

≤400℃

High temperature corrosion resistance

3Cr13

 

≤400℃

 

High temperature corrosion resistance

2Cr13

≤600℃

Nitriding treatment is required.

High temperature and corrosion resistance

1Cr13

≤650℃

Nitriding treatment is required.

High temperature and corrosion resistance

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