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Cast 17-4 ph heavy sections

Cast 17-4 ph heavy sections

Cast 17-4 ph heavy sections

(OP)
We are anticipating casting 17-4 PH stainless steel.  The castings will weigh 6000-8000 pounds.  The wall thicknesses will average about 4-5 inches.  The chemistry will be as specified in CB7CU1.  Any input from foundrymen knowledgeable with these castings would be appreciated, specifically - do we shake out hot or cold?  How do we avoid excessive delta ferrite?

RE: Cast 17-4 ph heavy sections

http://www.nsrp.org/st2005/Product%20Design%20and%20Materials/Posters/Stefanick1.pdf

This is the first one that I found.  As I recall you are going to need to modify the chemistry and use some special casting practices.

What properties are you looking for?  How do you intend to heat treat this?

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RE: Cast 17-4 ph heavy sections

I have cast runner blades this weight in CA6NM. So I do not see any major changes to be incorporated for processing your castings in 17-4 PH alloy.

Use conventional wisdom and adopt sound foundry practices. It will be good if you could give a cold shake out. Heavily chill the thick sections . My main concern will be regarding homogenizing these castings and then cooling it fast.

You could also try casting a small part of equivalent section thickness and then perform various heat tret cycles to get the best properties and microstructure.

RE: Cast 17-4 ph heavy sections

(OP)
Heat treatment of the heavy section 17-4PH castings will consist of homogenization at 2100 degrees F, solution at 1900 deg.F, followed by hardening at 1150 deg.F.

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