Ball bearings for temperatures of -54° to 1000°C
Numerous parameters must be taken into account to make ball bearings suitable for use at extreme temperatures. For the product range of the Xtemp series, proven Supra and Premium class ball bearing technology with the most suitable materials and modifications were identified and tested on the test rig under the harshest conditions in order to find particularly high-performance combinations for applications at high and low temperatures. The materials most suited for the specific application, consisting of roller bearing steel, ceramics or PEEK, paired with a sophisticated design, adapted production processes, specifically selected sealing materials and cover materials and grease variants, guarantee optimum temperature resistance of the ball bearings, lower maintenance efforts and longer service lives. Furthermore, customers are no longer forced to acquire the costly product properties that they don’t even need which come with Premium ball bearings from the standard product range. You can find ball bearings for operating temperatures of -30°C to 150°C in our standard deep-groove ball bearing product range.
- Bearing clearance classes C2, CN, C3 and C4
- | Fa - axial load
- | Noise test by decibels
- | Noise test by vibration level for deep groove ball bearings
- | Noise test by vibration level for tapered roller bearings
- | P - dynamic equivalent load
- | PN/P0 tolerance class for radial bearings (without tapered roller bearings)
Technical information
Inadequate sealing can allow external environmental conditions to negatively impact running characteristics and thus a bearing’s service life. For this reason, bearings must be protected by seals.
Bearings with seals on both sides are generally lubricated for life.
At the same time, seals also prevent lubricants from leaking.
ZZ / Z
Sheet metal lid with a split seal effect. Only protects against coarse contamination. Only prevents grease from escaping to a limited extent, particular care is required when the grease becomes viscous, i.e. more liquid, because the risk of grease leaks increases. In such cases, a different viscosity class should be chosen for the grease, or a contact/non-contact seal should be used instead.
2RS / RS
A contact seal with effective sealing that protects against coarse and fine contamination. Also has very effective sealing that protects against lubricant leaks and therefore a long service life. The seal consists of nitrile rubber and has a temperature resistance of -40 °C to +100 °C as standard.
Note: These seals have different designs depending on the manufacturer. See also LLU, VV, DD as special designs of a 2RS seal.
As high operating temperatures and strong temperature increases go hand in hand material expansion during operation, this must be taken into account for high-temperature bearings. The bearing clearance of a bearing is usually identified by means of its C mark (C0, C2, C3 ...). This is not the case for high-temperature bearings above 180°C because bearing clearance parameters above the norm (>C5) are used here depending on the design. &As a result, the shaft and thus the inner ring can expand relative to the housing and thus the outer ring without the roller bearing becoming clamped between the rings.
A lubricant selection that is precisely tailored to the application conditions contributes disproportionately to the service life both in a positive and in a negative sense. For this reason, the technical and economical optimization of the lubricant is an important contribution made by our application consulting.
The lubricant must also meet various parameters to be suitable for high temperatures. The lubricant may not undergo chemical decompositionat high temperatures and must be able to retain its original shape and properties.
The lubricant must be adapted to its operating conditions such that a continuous and sufficient lubricating film forms under the specific prevailing operating conditions (forces/temperatures/speeds). Its viscosity may not become too low, meaning that it may not become too “thin.” To counteract this, lubricants that are very solid and tough at room temperature are usually used for high-temperature applications. These properties are fundamentally linked to the base oil used, which, along with thickeners and additives, forms the basis of a lubricating grease.
Examples of lubricants
Shell Gadus S3 T100 with a base oil based on mineral oil with a high viscosity index, excellent oxidation properties and only slight evaporation loss. (-20°C to 180°C)
Klüber BARRIERTA L 55 with a BARRIERTA base oil designed for long-term stability that is specially manufactured by Klüber. Combines high-temperature stability and resistance to aggressive media with good compatibility with plastics and elastomers.
(-40°C to 260°C)
LUBCON Turmotemp M 1502 based on a PFPE base oil. Additionally equipped with temperature-stable solid lubricant additives on a PTFE basis. (-60°C to 250°C)
We would be happy to make you a concrete offer for special processing, including the use of greases, oils or preserving agents specifically requested by you.
The standard roller bearing steel100Cr6 can usually only be used up to 120°C. Due to the hardening process that roller bearings undergo during heat treatment, the material structure has stresses in the material in addition to high hardness. These are then partially reduced after the hardening process by tempering. The longer and more intense the tempering process, the more these stresses are reduced. At the same time, the steel loses hardness, which has a negative impact on its load carrying capacity.
These stresses cause the roller bearing steel to “warp” at operating temperatures of more than 120°C, meaning that, in many cases, it can no longer meet the very precise shape and position tolerances. Steels with higher tempering temperatures are used for higher temperatures.
Symbol | Thermally stabilized up to | Load carrying capacity as a benchmark |
---|---|---|
SN | 120 °C | 100 % |
S0 | 150 °C | 90-100 % |
S1 | 200 °C | 75-90 % |
S2 | 250 °C | 60-75 % |
S3 | 300 °C | 50-60 % |
S4 | 350 °C | 45-50 % |
Note: Stainless steel is a cost-effective alternative to dimensionally stabilized roller bearing steel. It is very temperature-stable (up to 280°C) and does not require special thermal stabilization. It is suitable for many applications and cost-effective because it is available as a standard material for roller bearings.
Rings
Outer and inner rings are manufactured from 100Cr6 (German standard), SUJ2 (Japanese standard) or GCr15 (Chinese standard) as standard. Many high-temperature bearings are also manufactured from AISI 52100 stainless steel based on AISI440C or ceramic Si3N4.
max. temperature | bearing rings und rolling elements materials |
---|---|
>1000 °C | SiC ceramic (silicon carbide) |
800 °C | Si3N4 ceramic |
500 °C | Si3N4 ceramic |
up to 450 °C | Stainless steel |
400 °C | Si3N4 ceramic (graphite cage) |
280 °C bis 350 °C | 100Cr6 (graphite cage) |
-54 °C bis 280 °C | 100Cr6, thermally stabilized and coated, if applicable |
Cage
Steel sheet cages are manufactured from DC01A/ST12 as standard, PEEK as high-temperature plastic, graphite for simultaneous lubricant supply or without a cage as a fully spherical design.
Seals
Seals from NBR (acrylonitrile butadiene rubber) are manufactured as standard. This results in an operating temperature of -30 °C to +100 °C, even if the grease permits a higher temperature. For higher temperatures, the following materials can be used:
Base material | Designation | Temperature range |
---|---|---|
Acrylonitrile butadiene rubber | NBR | -40°C to 120°C |
Hydrogenated acrylonitrile butadiene rubber | HNBR/NEM | -30°C to 160°C |
Acrylate rubber | ACM | -17°C to 170°C |
Fluorine rubber (Viton) | FPM/FKM | -25°C to 200°C |
Silicone rubber methyl polysiloxane | MQ/PMQ/VMQ/PVMP | -70°C to 200°C |
FKM/FPM isalso known under the brand name Viton. ©Viton is a protected trade name of DuPont Dow Elastomers L.L.C.
Findling Wälzlager has already created more than 1,500 drawing parts for its customers. We will find you an economically and technically optimal solution for your application from the combination of ABEG® performance class and designs. You can trust 100 years of experience in rolling bearing technology.
Design | Temperature limit [°C] | Speed limit [min-1]* | Radial play | Rolling bearings Material | Coating | Sealing variants | Seals Material | Lubricant | Weitere Besonderheiten | Hersteller |
---|---|---|---|---|---|---|---|---|---|---|
HT150 | 150 | 8000 | >= C3 | AISI 52100 | Manganese phosphating | Sealed | Not specified | High temperature grease | Carter | |
Stainless steel series | 150 | 5200 | C3 or C4 | AISI 440C | Uncoated | Open/sealed/capped | NBR/steel plate | High temperature grease | SMT | |
BHTS 2RS C3 VT 180°C | 180 | 5280 | C3 | AISI 52100 | Uncoated | Sealed | FKM (Viton) | High temperature grease | Beco | |
BHTS 2RS C4 VT 200°C | 200 | 4800 | C4 | AISI 52100 | Uncoated | Sealed | FKM (Viton) | High temperature grease | Beco | |
BHTS ZZ C4 200°C | 200 | 4800 | C4 | AISI 52100 | Uncoated | Capped | Steel sheet | High temperature grease | Beco | |
T200 | 200 | 10000 | CN, C3 or C4 | 100Cr6 | Uncoated | Sealed (non-contact) / capped | FKM / steel plate | High temperature grease | Sonderbefettung / versch. Käfigarten | SWC |
HT200 | 200 | 4800 | >= C3 | AISI 52100 | Manganese phosphating | Capped | Steel sheet | High temperature grease | Carter | |
BHTS 2RS C4 VT 220°C | 220 | 3360 | C4 | AISI 52100 | Uncoated | Sealed | FKM (Viton) | PTFE grease | Beco | |
BHTS ZZ C4 220°C-250°C | 220 | 3360 | C4 | AISI 52100 | Uncoated | Capped | Steel sheet | PTFE grease | Beco | |
BHTS 2RS VT 250°C-280°C | 250 | 1200 | 4 x C5 | AISI 52100 | Manganese phosphating | Sealed | FKM (Viton) | PTFE grease | Beco | |
T250 | 250 | 8955 | CN, C3 or C4 | 100Cr6 | Uncoated | Sealed (non-contact) / capped | FKM / steel plate | High temperature grease | Sonderbefettung / versch. Käfigarten | SWC |
SST250 | 250 | 8955 | C3 | Stainless steel | Uncoated | Sealed (non-contact) | FKM (Viton) | Food-compatible grease | Sonderbefettung / versch. Käfigarten | SWC |
HT250 | 250 | 4800 | >= C3 | AISI 52100 | Manganese phosphating | Sealed | Not specified | High temperature grease | Carter | |
HT stainless steel series | 250 | 1750 | C4 | AISI 440C | Uncoated | Open/sealed/capped | FKM / stainless steel plate | High temperature grease | SMT | |
HT hybrid series | 250 | 1750 | C4 | AISI 440C / Si3N4 | Uncoated | Open/sealed/capped | FKM / stainless steel plate | High temperature grease | SMT | |
HT270 | 270 | 1225 | >= C3 | AISI 52100 | Manganese phosphating | Open | Open | High temperature grease | Carter | |
ZZHT270 | 270 | 1225 | >= C3 | AISI 52100 | Manganese phosphating | Capped | Steel sheet | High temperature grease | Carter | |
BHTS ZZ 280°C | 280 | 1200 | 4 x C5 | AISI 52100 | Manganese phosphating | Capped | Steel sheet | PTFE grease | Beco | |
HT2 | 280 | 140 | multiple C5 | 100Cr6 | Manganese phosphating | Open / capped | Steel sheet | High temperature grease | Sonderbefettung / versch. Käfigarten | SWC |
SST280 | 280 | 8955 | C3 | Stainless steel | Uncoated | Capped | Stainless steel plate | Food-compatible grease | Sonderbefettung / versch. Käfigarten | SWC |
HT3 | 300 | 140 | multiple C5 | 100Cr6 | Manganese phosphating | Capped | Steel sheet | High temperature grease | Sonderbefettung / versch. Käfigarten | SWC |
HT2X | 320 | 140 | multiple C5 | 100Cr6 | Manganese phosphating | Open / capped | Steel sheet | High temperature grease | Sonderbefettung / versch. Käfigarten | SWC |
SST320 | 320 | 8955 | C3 | Stainless steel | Uncoated | Capped | Stainless steel plate | Food-compatible grease | Sonderbefettung / versch. Käfigarten | SWC |
BHTS 330°C | 330 | 150 | 4 x C5 | AISI 52100 | Manganese phosphating | Open | Open | Molybdenum disulfide | Beco | |
HT330 | 330 | 170 | >= C3 | AISI 52100 | Manganese phosphating | Open | Open | High temperature grease | Carter | |
ZZHT330 | 330 | 170 | >= C3 | AISI 52100 | Manganese phosphating | Capped | Steel sheet | High temperature grease | Carter | |
BHTS ZZ GR CG 350°C | 350 | 70 | 4 x C5 | AISI 52100 | Manganese phosphating | Capped | Steel sheet | Lubricated by graphite cage | Käfig aus Graphit | Beco |
BHTS ZZ 350°C BECO PLUS | 350 | 300 | 4 x C5 | AISI 52100 | Manganese phosphating | Capped | Steel sheet | High temperature grease | Beco | |
HT1 | 350 | 140 | multiple C5 | 100Cr6 | Manganese phosphating | Open / capped | Steel sheet | High temperature grease | Sonderbefettung / versch. Käfigarten | SWC |
BHTS ZZ FB 375°C BECO PLUS | 375 | 70 | 4 x C5 | AISI 52100 | Manganese phosphating | Capped | Steel sheet | High temperature grease | Vollkugelig, ohne Käfig | Beco |
BHT FB 400°C | 400 | 70 | 4 x C5 | AISI 52100 | Manganese phosphating | Open | Open | High temperature grease | Vollkugelig, ohne Käfig | Beco |
BHT FB 450°C BECO PLUS | 450 | 70 | 4 x C5 | AISI 52100 | Manganese phosphating | Open | Open | Dry, ceramic coating of raceway | Vollkugelig, ohne Käfig | Beco |