Cost difference between grade 304 and 17-4PH and HyTens

[mailtrams]

Hello.

I am thinking of changing material of some components in a machine from steel 304 to 17-4.
And I’m wondering roughly in percent how much more the 17-4 steel costs.
If anybody knows the price ratio for 304 and HyTens I would also be happy.

Thanks Thomas.

 

[EdStainless]

It depends on a lot of factors. What product form? Is your 304 in the cold worked condition? What strength do you want from the 17-4PH?
But first, why 17-4PH? Do you need more strength and less corrosion resistance?

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[TVP]

What is HyTens?

 

[arunmrao]

TVP,
you keep me company. I thought that I was the only one who did not know Hy Tens.

However, now a google search indicates that it is a low alloy tool steel.

http://www.suppliersonline.com/propertypages/L6.asp

" All that is necessary for triumph of evil is that good men do nothing".
Edmund Burke

 

[mailtrams]

Thanks for the answers.
It will be for better wear resistance.
The price will be for Condition A.
Price for ageing I already have.
And is Condition A suitable for punching operations?
Thanks Thomas.

 

[mailtrams]

O and yes the 304 is cold worked before punching operation.
The for of the material is sheet.

 

[EdStainless]

mailtrams, What final condition will you use the 17-4 in? If it is one of the lower strength conditions then you should age before processing. Do not punch in the A condition. Over-aged is best, but any low strength aged condition will work.

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Rust never sleeps
Neither should your protection

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[mailtrams]

Thank you for the answer.
I was thinking of condition H900 due too the high strength.
I am not so a native English speaker so the word punching may be wrong used. The process may be stamping. The thickness of the plate is 2.5mm.
Also does anybody know where to find data for 17-4 in -94F (-70C) the application is a ledger plate in a drive chain for a freezer.

 

[EdStainless]

Now I can't find the link to an old thread for you. There are NASA documents that have the low temp properties of various PH grades.
As I recall you don't want to use the high strength condition at low temps.
You might also consider using 17-7PH. It will process in the "A" condition and can given the RH heat treatment to reach high strength.

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[tc7]

To the original question of cost, I recently got quotes on a similar PH stainless (13/8) and the cost would have run us $26.50 per pound. We went through similar soul searching on a 304 trade-off but the extreme strenght of 13/8 offered too many advantages that the designers liked.

Also here is a NASA link I use quite often:

http://ntrs.nasa.gov/search.jsp?N=4294960486

Look for an article entitled, "Stress corrosion cracking evaluation of precipitation-hardening stainless steel".
It is very useful information.

 

[tc7]

by the way, I am quite sure that either Carpenter or ATI will only sell the 17/4 in condition A.

 

[EdStainless]

I believe that Carpenter will sell 17-4 sheet in the overaged condition. Allegheny won't.
We only weld tubing in 17-7, so I am not positive.

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[metengr]

mailtrams;

Use the NASA link from the above post

http://ntrs.nasa.gov/search.jsp?N=4294960486

and find the publication below;

Low Temperature Mechanical Properties of Various Alloys, NASA-SP-5921 this publication will contain low temperature properties of 17-4 and other metals.

 

[mailtrams]

Thank you all for the great answers.