Technical Data Sheet
Alloy 17-7PH a precipitation hardening stainless steel that provides high strength and hardness, excellent fatigue properties, good corrosion resistance, good formability, and minimum distortion upon heat treatment.
Alloy 17-7PH provides valuable property combinations particularly well suited for aerospace applications. This special alloy also provides benefits for other applications requiring high strength and good corrosion resistance, as well as excellent properties for flat springs at temperatures up to 315°C (600°F ).
Corrosion Resistance
17-7PH stainless steel provides corrosion resistance in conditions TH 1050 and RH 950 is generally superior to that of the standard hardenable chromium types of stainless steels such as Types 410, 420 and 431, but is not quite as good as chromium-nickel Type 304. Corrosion resistance in Condition CH 900 approaches that of Type 304 in most environments.
Formability
In Condition A, Alloy 17-7 PH can be formed comparably to Type 301. It work hardens rapidly and may require intermediate annealing in deep drawing or in forming intricate parts. Spring-back is similar to that of Type 301. Alloy 17-7 PH is extremely hard and strong in Condition C. Therefore, fabrication techniques for such materials must be used.
| Chemical Composition Limits | ||||||||
| Weight% | C | Mn | Si | P | S | Cr | Ni | Al |
| 17-7PH | 0.09 max | 1.00 max | 1.00 max | 0.040 max | 0.030 max | 16.00-18.00 | 6.50-7.75 | 0.75-1.50 |
Typical Mechanical Properties
| Material | Condition |
Ultimate Tensile Strength (ksi) | 0.2 % Yield Strength (ksi) | Elongation % in 2D | % Reduction of Area | Rockwell C Hardness |
| 17-7 Sheet / Strip AMS 5528 |
Cond A | 105 max | 65 | 20 | – | 92 HRB max |
| 17-7 Sheet / Strip AMS 5528 |
TH1050 | 180-120 | 150 | 4-6 | – | 38-46 |
| 17-7 Sheet / Strip | RH950 | 220 | 200 | 9 | – | 46 |
| 17-7 Sheet / Strip AMS 5529 |
Cond C | 200 min | 175 min | 1 | – | 41 min |
| 17-7 Sheet / Strip AMS 5529 |
CH 900 | 240 min | 230 min | 1 | – | 46 min |
| 17-7 Bar AMS 5644 |
Cond A | 170 min | 140 min | 6 | 25 | 363 HB min |
Availability
Alloy 17-7PH is available in Sheet, Strip, Plate, Bars (Round Bars), Tube, Forgings and Welding Wire. 17-7PH Foil (Shim) is available in various thicknesses. View stock list for further information. Foil Stock List, Sheet Stock List, Plate Stock List. or contact Sales.
Specifications
Type 17-7 PH Stainless Steel is covered by the following specifications:
AMS 5528 Sheet, Strip and Plate
AMS 5529 Sheet, Strip Cold Rolled
AMS 5568 Welded Tubing
AMS 5644 Bars and Forgings (Cap. ASTM A 564 Type 631)
AMS 5678 Wire
AMS 5824 Welding Wire
MIL-S-25043 Cond. C, Sheet, Strip and Plate
ASTM A 693, ASTM A 313, ASTM A 564, ASTM A 579 and ASTM A 705
ASME SA 564, SA 693 and SA 705
UNS S17700