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KS R25

Product catalog summary

Brief Description of the Sliding Material: KS R25 is a high-capacity bearing material used in gasoline and diesel engines. It is known for its enhanced wear resistance, good embedding capability, and adaptability, making it suitable for bi-metal bearing shells. The material is resistant to oil corrosion and can handle specific load-bearing capacities up to 60 MPa, making it ideal for medium to high-load engines. It complies with the EU Directive 2000/53/EC on End-of-Life Vehicles.

Bearing Structure: KS R25 bearings consist of a steel back, an intermediate layer of pure aluminum, and an aluminum-tin-copper running layer. The steel back is typically grade DC04 with a hardness of 150-220 HB. The steel layer thickness ranges from 1.0 to 3.0 mm, while the intermediate aluminum layer is 0.01 to 0.05 mm thick. The running layer is 0.2 to 0.5 mm thick with a hardness of 35-55 HB.

Material Characteristics: KS R25 has a tensile strength of over 160 MPa, a yield point of over 130 MPa, a Young's modulus of 63 GPa, a coefficient of thermal expansion of 24 x 10^-6 k^-1, and thermal conductivity of 50 W/(m·k).

Manufacture of the Sliding Material: The aluminum alloy is produced through vertical continuous casting, followed by mechanical processing and heat treatment. A pure aluminum foil is plated onto the strand, and roll-cladding applies the pre-composite onto the steel. Thermomechanical treatments achieve the desired material characteristics.

Plain Bearing Manufacture: KS R25 strips are used to manufacture sliding elements through punching and forming. The final wall thickness and inside surface design are achieved by machining.

Application: KS R25 sliding elements are suitable for main bearings in medium to high-load engines due to their wear resistance and adaptability.

Test Conditions: The test involved a bearing shell diameter of 47.8 mm, a wall thickness of approximately 1.4 mm, a sliding velocity of 0.25 m/sec, a specific static load of 6.2 MPa, and a test duration of 3 hours.

Chemical Composition of the Running Layer: The running layer consists of 18.5 to 24.0% Sn, 1.7 to 2.3% Cu, with maximum limits for Si, Ti, Ni, Fe, Mn, and other elements, with the remainder being aluminum.

Comparison of Specific Load Carrying Capacity and Wear Behavior: KS R25 shows competitive specific load carrying capacity and wear behavior compared to other materials like KS R20, KS R21, KS R30, and KS R45.

Disclaimer: KS Gleitlager GmbH does not assume liability for the completeness of the data and emphasizes that the information does not constitute a legal guarantee.

Catalog excerpts

Kolbenschmidt Pierburg Group KS R25 Lead-free Steel/Aluminum Composite Material for Main Bearings

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Brief description of the sliding material Plain bearings made from steel/aluminum composite materials are widely used as main bearings in gasoline and diesel engines. KS R25 is a high-capacity bearing material. Given its enhanced wear resistance, good embedding capability and adaptability, KS R25 is suited for the manufacture of bimetal bearing shells, for example. This material is insensitive to oil corrosion. With its specific load-bearing capacity of up to 60 MPa, this material is suited for application in engines subject to medium to high loads. In the present chemical composition, KS R25...

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Chemical composition of the running layer Sn Cu Si Ti Ni Fe Mn others combined AI The hardness of the running layer is in the range of 35 - 55 HB Manufacture of the sliding material The aluminum alloy is manufactured in vertical continuous casting. Mechanical processing of the strand surface as well as special heat treatment steps prepare the material for plating. The so-called pre-composite results from plating a pure aluminum foil (Al 99.5) on the strand. Roll-cladding is used to apply the pre-composite onto the steel. Selective thermomechanical treatment steps afford the desired material characteristics....

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KS Gleitlager GmbH · Am Bahnhof 14 · 68789 St. Leon-Rot · GERMANY Tel. +49 6227 56-0 · Fax +49 6227 56-302 · www.kspg.com KS Gleitlager GmbH does not assume any liability for the completeness of the data presented in this materials brochure. It is exclusively up to the customer to form his opinion about the characteristics of the material and its adequacy for the purposes intended by the customer. KS Gleitlager GmbH would also like to stress that any information given in this materials brochure does not constitute a legal guarantee for the appearance, characteristics and workmanship nor does...

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