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SS PH15-5 and Cond. A in MIL-HDBK-5
2

SS PH15-5 and Cond. A in MIL-HDBK-5

SS PH15-5 and Cond. A in MIL-HDBK-5

(OP)
MIL-HDBK-5 says that a part in SS PH15-5 should never be used in condition A. What is the reason? Is it related to stress-corrosion cracking? Thanks, Ben bahavar

RE: SS PH15-5 and Cond. A in MIL-HDBK-5



Why would you want to use a Precipitation Hardened steel in a non precipitated condition?

RE: SS PH15-5 and Cond. A in MIL-HDBK-5

Thread thread330-243608: 17-7 PH Condition A - In-service Use in the metallurgy forum has some background that's relevant, albeit as a result of some confusion between 17-4 (which is similar to 15-5 in many ways) and 17-7.

The Aerospace Structural Metals Handbook (ASMH) says that the elongation in condition A is 3% minimum. Essentially for 15-5PH (and 17-4PH) condition A can be brittle, with a 180 degree bend rad of 18t.

Other data in the ASMH indicates that condition A is a bit better than conditions H900 and H925 for stress corrosion cracking and toughness.

It would pay to get the opinion of an actual metallurgist.
 

RE: SS PH15-5 and Cond. A in MIL-HDBK-5

(OP)
An engineer who is no longer avaiable had recommended that this be done!

RE: SS PH15-5 and Cond. A in MIL-HDBK-5

So is this the engineer who will be blamed, or the engineer that recommended a metallurgist be brought in?

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