High-performance alloy material for industrial engineering and critical application conditions.
Scope of supply of Aviation Group:
Non-standard forgings, round rods, steel plates, rings, seamless pipes
1. 17-7PH material introduction
17-7PH is an austenite-martensite precipitation hardened stainless steel developed based on 18-8CrNi, also known as controlled phase change stainless steel.
2. Chemical Ingredients
| alloy | C | Mn | Si | P | S | Cr | Ni | Al |
| 17-7PH | – | – | – | – | – | 16.0 | 6.50 | 0.75 |
| 0.09 | 1.0 | 1.0 | 0.04 | 0.03 | 18.0 | 7.75 | 1.50 |
3. Physical properties
| density | 7.65g/cm³ |
| Melting point | 1415-1450℃ |
Mechanical properties of 17-7PH alloy at room temperature
| Condition | Tensile strength Rm N/mm2 | Yield strength RP0.2 N/mm2 | Elongation A5 % | Brinell hardness HB |
| Solid melting 1000~1100℃ Quick cooling | ≤1030 | ≤380 | ≥20 | ≤229 |
| 565℃ aging | ≥1140 | ≥960 | ≥5 | ≥363 |
| 510℃ aging | ≥1230 | ≥1030 | ≥4 | ≥388 |
4. Material properties
17-7PH is a hardened stainless steel with high strength and hardness, fatigue resistance, good corrosion resistance and die forging. After solid solution treatment, it is an unstable austenite structure with good plastic toughness and processability. After adjustment, the austenite precipitation of carbide composition changes. After martensite transformation treatment, most of the structures are transformed into low-carbon tempered martensite with good toughness. This state is the use state of steel and has good medium-temperature mechanical properties. Corrosion resistance is better than general martensitic stainless steel.
5. Application areas
Used in aerospace, chemical, petrochemical, papermaking and metal processing industries.
