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A Design Study in Steel - Crossbleed Valve for the F-5

Steel Alloy Selection

The valve body needs to have high strength and hardness at elevated temperatures, excellent corrosion resistance, and be easily machined.  

An engineering review selected the 
stainless steel alloy 17-4PH for the casting. 

The 17-4PH alloy is a martensitic precipitation hardening chrome-nickel stainless steel with Cu and Cb/Nb additions. 

The 17-4PH alloy retains its mechanical strength up to 550 F. 

The alloy is rated for good oxidation resistance to 900 F.

In the annealed condition, 17-4PH has good machinability, similar to that of 304 stainless steel.

 

Composition Specifications 
for 17-4PH

Element

Min

Max

Chromium

15.50

16.70

Nickel

3.60

4.60

Copper

2.80

3.50

Silicon

0.50

1.00

Columbium

0.15

0.40

Phosphorus

--

0.025

Sulfur

--

0.025

Carbon

--

0.06

Manganese

--

0.70

Per AMS5355H


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Copyright 2007 by the Steel Founders' Society of America.
All rights reserved.  Address comments to: 
blairr@sfsa.org
Last Modified:December, 2007 by STG

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