17-4 cr es
17-4 cr es
(OP)
Hi,
We've been asked to produce a gear blank in this materiel (17-4 CR ES) I understand it's american 416 range but can find no documentation on it. Is this material available and machinable ?
thanks for any info
We've been asked to produce a gear blank in this materiel (17-4 CR ES) I understand it's american 416 range but can find no documentation on it. Is this material available and machinable ?
thanks for any info





RE: 17-4 cr es
http://www.alleghenytechnologies.com/allvac/pages/Steel/UNSS17400.htm
http://www.cartech.com
click on Technical Information then Alloy Category then Stainless Steel then Precipitation Hardenable Stainless Steels then Carpenter Stainless Custom 630 or Project 70+® Custom 630 Stainless (better machining version)
RE: 17-4 cr es
RE: 17-4 cr es
A typical fabrication route would be to obtain bar/wire in the solution annealed condition. Forming or machining would take place, and then the precipitation hardening treatment. This allows for easy forming and machining, and since the aging treatment takes place at a relatively low temperature, this is little distortion. Since you are making a gear, you will likely perform a final grinding operation after aging, but the hardness will be much lower than a hardenend or carburized alloy steel gear would be. If the gear is to be completely machined, then I highly recommend you investigate the Project 70+® Custom 630 Stainless with Carpenter, as this will be a big improvement in machinability.
RE: 17-4 cr es
Doug
RE: 17-4 cr es
Thanks for the info, really helpfull.
Kind regards
RE: 17-4 cr es
RE: 17-4 cr es
Subzero temps - better fracture toughness than alloy steels.
Elevated temps - above usual tempering temperature for alloy steels? 900 F aging temp is about 480 C, so maybe for temperatures in the range of 300-450 C?
Corrosion - environments that might contaminate oil and initiate corrosion in alloy steels might be ok for PH stainless.
RE: 17-4 cr es
Temperature possibly but there are carburizing grade materials such as CBS50N from Timken that have much better performance at elevated temperatures.
If the oil gets contaminated then it won't work very well as a lubricant for any material.
Not meaning to sound chicken***t - I am really interested in the decision process that arrived at this alloy for this application.
RE: 17-4 cr es
RE: 17-4 cr es
There are some very good booklets on 17/4 that were published by ARMCO Steel. If you could find one of these it could be a great help.
RE: 17-4 cr es
I was thinking more along the lines of 4118, 8620, 8822H, etc. I agree with you that 9310 should have equivalent fracture toughness down to ~ 120 K (- 150 C).
What do you think about a relatively light load application at very low temperature where conventional "oils" are no longer suitable. MoS2 may be the lubricant, and carburized 9310 doesn't have sufficient corrosion resistance. That's about the best that I can come up with.
RE: 17-4 cr es
17-4 PH non-magnetic? Probably just a broken keyboard. <g>
RE: 17-4 cr es
RE: 17-4 cr es
Red face here. 17-4, not 17-7.
RE: 17-4 cr es