About Alloy
15-7 Mo (UNS S15700) is a semi-austenitic precipitation-hardening stainless steel that provides high strength and hardness, good corrosion resistance, and minimum distortion on heat treatment. It is easily formed in the annealed condition and develops an effective balance of properties by simple heat treatments. For application requiring exceptionally high strength, cold-reduced 15-7 Mo Stainless Steel in Condition CH 900 is particularly useful for applications permitting limited ductility and workability. This alloy is particularly beneficial for a wide range of applications that include retaining rings, springs, diaphragms, aircraft bulkheads, welded and brazed honey comb paneling and other aircraft components requiring high strength at elevated temperatures.
Product Form & Standard
AMS 5520: sheet, strip and plate
Chemical Composition
| Element | Content (%) |
| Iron, Fe | Balance |
| Chromium, Cr | 14 -16 |
| Nickel, Ni | 6.50 - 7.75 |
| Molybdenum, Mb | 2 - 3 |
| Silicon, Si | 1 |
| Manganese, Mn | 1 |
| Aluminum, Al | 0.75 - 1.50 |
| Carbon, C | 0.09 |
| Phosphorus, P | 0.040 |
| Sulfur, S | 0.040 |
Mechanical Properties
| Material | Condition | Thickness (in) | Tensile Strength (ksi) | Yield Strength (ksi) | Yield Strength (ksi) | Hardness |
| Alloy 15-7 Mo | Solution Treated | <0.005 | 150 (max) | 65 (max) | 25 | 100 HB (max) |
| Alloy 15-7Mo | TH1050 (AMS 5520) | 0.010-0.020 | 190 | 170 | 4 | 40 HRC |
| Alloy 15-7 Mo | TH1050 (AMS 5520) | 0.020-0.1875 | 190 | 170 | 5 | 40 HRC |
| Alloy 15-7 Mo | TH1050 (AMS 5520) | 0.1875-0.500 | 190 | 170 | 6 | 40 HRC |
| Alloy 15-7 Mo | RH950 (AMS 5520) | 0.010-0.020 | 225 | 220 | 3 | 45 HRC |
| Alloy 15-7 Mo | RH950 (AMS 5520) | 0.020-0.1875 | 225 | 220 | 4 | 45 HRC |
| Alloy 15-7 Mo | RH950 (AMS 5520) | 0.1875-0.500 | 225 | 220 | 5 | 45 HRC |
| Alloy 15-7 Mo | Condition C | - | 200 | 175 | 1 | 41 HRC |
| Alloy 15-7 Mo | Condition CH900 | - | 240 | 230 | 1 | 46 HRC |
Application
Paneling and springs
Diaphragms
Retaining rings
Welded and brazed honeycomb paneling
Aircraft components bulkheads
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