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CRONIDUR Information ?

CRONIDUR Information ?

CRONIDUR Information ?

I search informations on cronidur alloy : approximative chemical analysis or equivalent alloys, advantages and drowbacks,....


RE: CRONIDUR Information ?

I found several 'Cronodur' alloys.  The one with many current references is Cronodur® 30.

"Cronidur® 30 is a martensitic throughhardened steel that can also be induction case hardened. The primary difference between 52100 and Cronidur® 30, for example, is that in Cronidur® 30 some of the carbon content has been replaced with nitrogen. A comparison of the chemical compositions of Cronidur® 30, 52100 and 440C are presented in Figure 2."

Material            C     N     Si     Cr
52100           1.00    —    0.25  1.45
Cronidur®30 0.31   0.38 0.55 15.2
440C            1.08    —    0.40 17.0

Some mechanical properties:
                             52100   Cronidur® 30
Hardness               58 HRC   58 HRC
Useful Operating T  250°F    390°F
Bending Strength    120 ksi  160 ksi
Fracture Elongation:
     • Length              1         3
    • Transversal      0.3         2

Claims for Cronidur® 30 include a higher fatigue life and finer microstructure (evidence is shown) and greater resistant to corrosion than 440C (conditions not stated). See the bulletin at http://www.bardenbearings.com/PDF%20CD/PB18.PDF
It seems to have been used primarily in aerospace, but also in Swiss watches, medical devices, etc.

RE: CRONIDUR Information ?

Thank you for your quick answer. It is very useful and confirm our assumption that CRONIDUR is not so different from a Aubert&Duval alloy : XD15NW (X40CrMoVN16.2.

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