About Alloy
One of the most frequently used in the the aerospace industry and when meticulous, elaborate parts are needed, 17-7 PH stainless steel is a common choice.
A stable, chromium-nickel-aluminum steel, 17-7 is a precipitation hardening steel with a high strength and moderately resistant to corrosion. In terms of corrosion resistance, 17-7 PH is comparable to 304 stainless steel and a better choice when compared to the 400 series of stainless steel.
17-7 PH is further strengthened by a low temperature precipitation hardening treatment (also termed aging). The industry standard is to age Condition R material at 950°F for one hour, resulting in an end condition of RH 950. Condition T material is aged at 1050°F for 90 minutes, resulting in an end condition of TH 1050. Typical room temperature mechanical properties are listed in Table 2. Very high strength properties are obtained. TH 1050 provides more ductility at a reduced strength level.
Product Form & Standard
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 Wires
Chemical Composition
| Element | Content (%) |
| Iron, Fe | 70 - 75% |
| Chromium, Cr | 16.0 - 18.0 |
| Nickel, Ni | 6.50 - 7.75 |
| Silicon, Si | 1.0 |
| Manganese, Mn | 1.0 |
| Aluminum, Al | 0.75 - 1.50 |
| Carbon, C | 0.090 |
| Sulfur, S | 0.040 |
| Phosphorous, P | 0.040 |
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 |
Application
Grade 17-7 stainless steel is mostly found in washers and springs.
It is used in applications which require high strength and corrosion resistance
It is also used in intricate parts due its low distortion on heat treatment.
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