| Analysis | Mechanical_Properties | Applications | Machineability_and_Weldability | Heat_Treating | Tolerances | Speedy Metals items |
17-4 PH is a chromium-nickel grade of stainless that may be hardened by a single low temperature precipitation-hardening heat treatment. Excellent mechanical properties at a high strength level may be obtained by such treatment. Scaling and distortion is minimized. 17-4 PH should not be used in the solution treated condition. The strength and corrosion resistance properties of 17-4 hold up well is service temperatures up to 800° F. Fabrication techniques for this steel is similar to those established for the regular stainless grades. 17-4 machines well, has excellent welding characteristics, and forges easily. The combination of good mechanical and processing properties makes this grade adaptable to a wide range of uses.-Online
17-4 stainless generally conforms to ASTM A564 Type 630 AMS 5643
The above values are average and may be considered as representative of 17-4 stainless
17-4 is used where high strength and good corrosion resistance are required, as well as for applications requiring high fatigue strength, good resistance to galling, seizing and stress corrosion. Suitable for intricate parts requiring extensive machining and welding, and/or where distortion in conventional heat treatment is a problem. The corrosion resistance of 17-4 is superior to that of hardenable straight chromium grades such as 416. It approaches the corrosion resistance of the non-magnetic chromium-nickel grades. Corrosion resisting properties will be affected by such conditions as surface finish and aging heat treatment. Common applications include uses in aircraft and gas turbines, nuclear reactors, paper mills, oil field industry, and chemical process components
Machinability in the annealed condition is rated at 48% of B1112. Average cutting speed 80 ft/min. 17-4 is readily weldable by all the conventional processes. Preheating and post-heating practices used for the standard hardenable stainless grades are not required. 17-4 can be forged between 2050°-2150° F. Do not forge below 1850° F. Forgings are air cooled to 90° F or lower.
Condition H 900° - 900° F for 1 hour, air cool. Rockwell C 44 average
Condition H1025°- 1025° F for 4 hours, air cool. Rockwell C 38 average
Condition H1150°- 1150° F for 4 hours, air cool. Rockwell C 33 average
Annealing (Condition A)
The annealing (solution treatment) temperature is 1900° F, followed by air cooling. Maximum Brinell hardness at mid-radius is 363.
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ROUND (drawn, smooth turned, or ground) |
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size (inches) |
OVER |
UNDER |
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.044 to 5/16, incl |
0.001 |
0.001 |
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5/16 to 1/2, excl |
0.0015 |
0.0015 |
|
1/2 to 1, excl |
0.002 |
0.002 |
|
1 to 1-1/2, excl |
0.0025 |
0.0025 |
|
1-1/2 to 4, incl |
0.003 |
0.003 |
|
4-1/8 to 4-1/2, incl |
0.005 |
0.005 |
|
4-9/16 to 6, incl |
0.008 |
0.008 |