Is heat treating of 17-7ph required 4

[engamopar]

Application: Have a 17-7ph stamped bracket supplied in condtion "A" in accordance with AMS5528. Its final finish will be CAD plated TYPE II, class 2 per AMS-QQ-P-416. Bracket requires identification stamping on the flat portion. Q.?: IS HEAT TREATMENT prudent other than the ANNEALED condition -i.e.
TH 1050 or RH950? AND should the marking be done between prior to or after plating?

 

[EdStainless]

You need to heat treat this alloy.
While not as bad as 17-4 the annealed properties hare highly variable and unreliable.
I would stamp prior to heat treating. That should reduce concerns about local stresses.

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Plymouth Tube

 

[btrueblood]

Why cadmium plating on a stainless part?

 

[engamopar]

CAD Plating is a requirement dictated by customers' spec/requirement.

Anyone have a suggestion of which heat treat? TH 1050 or RH950.
(Or other?)
None was specified by customers' requirement (unless there is a default embedded in AMS 5528 specification - which we currently do not have.)

 

[prdave00]

I'd say it depends on the application. We heat treat to the H900 condition, but I've been told this condition has issues with stress corrosion cracking (something that isn't a problem with our application). It's my understanding that the H1150 condition is better in terms of SCC. I'd refer to data sheets at AK Steel or ask the customer (probably the more advisable suggestion).

 

[EdStainless]

TH1050 has lower strength, higher toughness, and better SCC resistance
RH950 is much stronger (and harder) but with little toughness.

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Plymouth Tube

 

[israelkk]

Why did you choose 17-7PH at first if you do not use its stainless properties and apply cadmium plating on it, and do not use it high strength properties? There are probably cheaper stainless and carbon steels that can do the job.

 

[engamopar]

No strength, toughness, hardness specs were given by the end user.
Only the requirements that it be 17-7pH AND that it be cad plated.
I believe I'll go with the the TH 1050.
Thanks to all for your assistance.