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PH 15-7 Mo Stainless Steel (AMS 5520/ UNS S15700)
Technical Data Sheet
PH 15-7 Mo is a precipitation hardenening stainless steel used for applications requiring high strength and moderate corrosion resistance. It is similar to 17-7 with the substitution of 2% Molybdenum for 2% Chromium resulting in higher room and elevated temperature strength for 15-7 Mo. PH 15-7 Mo stainless steel may be formed in a soft austenitic condition and then hardened to high strength levels by low temperature heat treatments. This allows miminum distortion compared to other quench and temper hardening processes. For maximum strength requirements, 15-7 Mo strip can be supplied in the hard-rolled Condition C for heat treatment to condition CH900.
| Chemical Composition Limits | |||||||||
| Weight% | C | Mn | Si | P | S | Cr | Ni | Mo | Al |
| 15-7Mo | 0.09 | 1 | 1 | 0.04 | 0.03 | 14-16 | 6.50-7.75 | 2-3 | 0.75-1.5 |
The heat treatment processes for 15-7 Mo Stainless Steel (AMS 5520/ UNS S15700) are as follows:
Solution Treatment: heat to 1950°F and air cool
TH1050 (AMS 5520)
Solution Treatment: heat to 1950°F and air cool
Austenite Condition: Heat to 1400°F and hold for 90 minutes and cool to 55°F within 1 hr and hold for 30 minutes
Precitipation Harden: Heat to 1050°F and hold for 90 minutes then air cool
RH950 (AMS 5520)
Solution Treatment: heat to 1950°F and air cool
Austenite Condition: Heat to 1750°, hold for 10 minutes and cool to room temperature. Then within 1 hour cool to -100°F, hold for 8 hours then warm in air to room temperature
Precitipation Harden: Heat to 950°F and hold for 90 minutes then air cool
CH900
Condition C: Condition A is transformed to martensite at the mill by cold reduction to Condition C
Fabricate
Precipitation Harden: Heat to 900°F (+/-10) and hold for 60 minutes then air cool
Typical Mechanical Properties
| Material | Condition | Thickness (in) | Tensile Strength (ksi) | Yield Strength (ksi) | Elongation % | 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 |
Availability
Alloy PH 15-7Mo Stainless Steel is available in Sheet and Strip. For all stock availability contact Sales.
Specifications
AMS 5520 sheet, strip and plate (15-7 Sheet)
MIL-S-8955
AISI 632
ASTM A693 Grade 632
UNS S15700
