CRONIDUR Information ?
CRONIDUR Information ?
(OP)
I search informations on cronidur alloy : approximative chemical analysis or equivalent alloys, advantages and drowbacks,....
Thanks
Thanks
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RE: CRONIDUR Information ?
"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 ?