Bearing Steels - Cronidur 30 - AMS 5898 - 1.4108

Cronidur 30 - AMS 5898 - 1.4108

Cronidur 30 is a pressure-nitrided, highly corrosion-resistant martensitic cold work steel. Hardness up to 60 HRc combined with excellent toughness are some of the properties Cronidur 30 has to offer. Combination of the PESR (Pressure Electro Slag Remelting) process with a forging or rolling technique allow a very high level of cleanliness to be achieved. Cronidur 30 offers polishability and machinability, it also retains stability after heat treatment. It has excellent corrosion resistance and wear resistance compared to standard cold work steels as well as offering a high tempering resistance up to 500°C. The range of properties Cronidur 30 offers make it suitable for the aerospace industry and engineering purposes, specifically ball bearings, pump vanes, spindles, medical instruments amongst many other uses.

Chemical Composition

Spec: AMS 5898

Chemical Element % Present
Carbon (C) 0.25 - 0.35
Manganese (Mn) 0.0 - 1.00
Silicon (Si) 0.0 - 1.00
Nickel (Ni) 0.0 - 0.50
Molybdenum (Mo) 0.85 - 1.10
Nitrogen (N) 0.30 - 0.50
Chromium (Cr) Balance


Spec: AMS 5659


Mechanical PropertyValue
Tensile Strength 2150 MPa
Hardness Rockwell C 58 HRC
Elongation A50 mm 3 %

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Last Datasheet Revision

18 July 2019


This Data is indicative only and as such is not to be relied upon in place of the full specification. In particular, mechanical property requirements vary widely with temper, product and product dimensions. All information is based on our present knowledge and is given in good faith. No liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon.

Please note that the 'Datasheet Update' date shown above is no guarantee of accuracy or whether the datasheet is up to date.

The information provided in this datasheet has been drawn from various recognised sources, including EN Standards, recognised industry references (printed & online) and manufacturers’ data. No guarantee is given that the information is from the latest issue of those sources or about the accuracy of those sources.

Material supplied by the Company may vary significantly from this data, but will conform to all relevant and applicable standards.

As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose, whether expressed or implied.

Advice given by the Company to any third party is given for that party’s assistance only and without liability on the part of the Company. All transactions are subject to the Company’s current Conditions of Sale. The extent of the Company’s liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.