PH 15-7 Mo Stainless Steel
UNS S15700
Description
PH 15-7 Mo stainless steel is a semi-austenitic precipitation-hardening stainless steel that provides high strength and hardness, good corrosion resistance and minimum distortion on heat treatment. Usually, PH 15-7 Mo stainless steel has five common variations, namely annealed PH 15-7 Mo stainless steel, cold rolled PH 15-7 Mo stainless steel, H900 hardened PH 15-7 Mo stainless steel, RH950 hardened PH 15-7 Mo stainless steel and TH1050 hardened PH 15-7 Mo stainless steel. PH 15-7 Mo is used in a wide range of applications that include springs, retaining rings, aircraft bulkheads, diaphragms, welded and brazed honey comb paneling and other aircraft components which require high strength at elevated temperatures.
Chemical Component
| Cr | Ni | Si | C | Mn | Mo | S | P | Al |
|---|---|---|---|---|---|---|---|---|
| 14-16% | 6.50-7.75% | 1% max | 0.09% max | 1% max | 2-3% | 0.03% max | 0.04% max | 0.75-1.5% |
Basic Information
| Items | PH 15-7 Mo Stainless Steel |
|---|---|
| Catalog | ACMA-Fe-A038 |
| Density | 0.282 lb/in3, 7.8 g/cm3 |
| Modulus of Elasticity in Tension | 29.0 X 106 psi |
| Melting Range, °F (°C) | 2550-2640 (1400-1450) |
Material Forms
Alfa Chemistry offers PH 15-7 Mo stainless steel in a variety of forms, including Sheet, Strip.
Heat Treatment
The heat treatment processes for 15-7 Mo stainless steel (AMS 5520/ UNS S15700) are as follows:
- 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 °F, 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
| Conditions | Thickness (in) | Ultimate Tensile (ksi) | Yield Strength (ksi) | Elongation (%) | Hardness |
|---|---|---|---|---|---|
| Solution Treated | <0.005 | 150 (max) | 65 (max) | 25 | 100 HB (max) |
| TH1050 (AMS 5520) | 0.010-0.020 | 190 | 170 | 4 | 40 HRC |
| TH1050 (AMS 5520) | 0.020-0.1875 | 190 | 170 | 5 | 40 HRC |
| TH1050 (AMS 5520) | 0.1875-0.500 | 190 | 170 | 6 | 40 HRC |
| RH950 (AMS 5520) | 0.010-0.020 | 225 | 220 | 3 | 45 HRC |
| RH950 (AMS 5520) | 0.020-0.1875 | 225 | 220 | 4 | 45 HRC |
| RH950 (AMS 5520) | 0.1875-0.500 | 225 | 220 | 5 | 45 HRC |
| Condition C | - | 200 | 175 | 1 | 41 HRC |
| Condition CH900 | - | 240 | 230 | 1 | 46 HRC |
Specifications
Sheet, Strip: AMS 5520 sheet, strip and plate (15-7 Sheet), MIL-S-8955, AISI 632, ASTM A693 Grade 632, UNS S15700
Applications
- Springs
- Retaining rings
- Seal Rings
- Diaphragms
- Aircraft bulkheads
- Welded and brazed honeycomb paneling
- Aircraft components
* Technical data included herein should be used as a guideline only, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice.
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