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SCC of 17-4PH H900 Drive Rod

SCC of 17-4PH H900 Drive Rod

SCC of 17-4PH H900 Drive Rod

(OP)
I am currently working on a 17-4PH H900 drive rod that failed by SCC.  I am having troubles nailing down the possiable causes of SCC in 17-4PH.  We have found traces of cholrine and sulfur in the corrosion products.  The rod would have operated at temperatures up to 300-F.  Are cholrin or sulfur known to cause SCC at these temperatures?  Also, pits were observed along the surface that the SCC intiated.

Thanks for any help anyone can offer.

RE: SCC of 17-4PH H900 Drive Rod

YES.
If you have pits then you have active corrosion.  Once that happens CSCC will be a high prob.
One problem with PH grades in there highest strength condition is that the CSCC easily.

= = = = = = = = = = = = = = = = = = = =
Corrosion, every where, all the time.
Manage it or it will manage you.
http://www.trent-tube.com/contact/Tech_Assist.cfm

RE: SCC of 17-4PH H900 Drive Rod

(OP)
Thank-you all for the resources.  They were very helpfull in this situation.

RE: SCC of 17-4PH H900 Drive Rod

While MSFC-SPEC-522 remains a valuable reference, it has been superseded by NASA-STD-3029 http://psrp-pub.jsc.nasa.gov/docs/3029.pdf (which isn't much changed from MSFC-SPEC-522)...

RE: SCC of 17-4PH H900 Drive Rod

The docuement located at the NASA link I supplied above is already out of date.  MSFC-STD-3029 (not "MSFC-SPEC-3029" as I typed above), is currently at the "A" revision...

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