17-4 ph cond h900
17-4 ph cond h900
(OP)
I work with stainless steel 17-4 ph cond A and I have to bring it to cond h900. How do I know how long I have to heat up the pieces to get good result? And will I have a different result heating up too long.





RE: 17-4 ph cond h900
This means the metal temperature is at 900F when the clock starts. You can put the part into an oven that is at 900F from room temperature to minimize the metal heat up time. If your oven has circulation I would allow 15 min per in thickness to come up to temperature. If there is no circulation I would allow 25 minutes per inch of thickness if the oven is at 900F. I would not exceed 15 minutes on the clock.
Can you comeback with the size of your part with the thickness section?
If possible the end use as there are some caveats on using 17-4 PH H900.
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RE: 17-4 ph cond h900
I can't tell you how many times during audits I have requested the latest temperature survey of a heat treatment furnace and I receive a blank stare.
RE: 17-4 ph cond h900
Do you think that the fact I heated up to long could be the problem, or could my cooling process be part of the result?...
I cool up by opening about 2" wide the door of the oven en leaving piece in the oven.
End use of the the piece is a 20Tons tention Load cell to go on a crane. The crane is located off shore.
RE: 17-4 ph cond h900
Your part will need to solution heat treated and re heat treated using the correct temperature, time, and cooling rate.
Before we go any further exactly how is the 17/4 part going to be used, like is it in tension or compression?
I personally would not use 17/4 @ H900 on any part of a lifting device especially offshore due to it's lower ductility and a higher degree of susceptibility to Chloride Stress Corrosion Cracking.
RE: 17-4 ph cond h900
Load cells consist in measuring the deflection of the metal. Ductility has to be low to get good result. I know about the higher degree of susceptibility to Chloride Stress Corrosion Cracking, but how exactly can I control it?
What would be the stainless type you would use for such application.
RE: 17-4 ph cond h900
RE: 17-4 ph cond h900
The ductility of of Nitronic 50 (HS) is reduced based on the amount of cold work introduced in the metal. It also has better resistance to SCC than 17/4 SS
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RE: 17-4 ph cond h900
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RE: 17-4 ph cond h900
Around saltwater in condition H900 ?
RE: 17-4 ph cond h900
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see pages 13 and 14.
RE: 17-4 ph cond h900
They were fully painted, either epoxy or powder coated.
And the safety factors were huge. We had one rated for 25T, it would take 100T without damage to calibration, and at 100T it still had a more than 4:1 factor. The material was never stressed to over 10% of the minimum yield strength.
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