17-7PH Stainless Steel
Introduction
Overview of 17-7PH Stainless Steel
17-7 PH stainless steel, also called 631 precipitation hardening stainless steel material.
It is a precipitation hardening stainless steel strip that provides high strength and hardness, excellent fatigue properties, good corrosion resistance, good formability, and minimum distortion upon heat treatment.
The alloy strip provides valuable property combinations particularly well suited for aerospace applications.
This special alloy material also provides benefits for other applications requiring high strength and good corrosion resistance, as well as excellent properties for flat springs at temperatures up to 600°F (316°C).
Futures of 17-7PH Stainless Steel
- High strength
- Good corrosion resistance
- Excellent fatigue properties
- Good formability
- High-temperature properties
17-7PH Stainless Steel Applications
- Retaining rings
- Springs
- Valves and flanges
- Gears
- Aircraft parts
17-7PH Stainless Steel Tags
- Grade 17-7PH
- Type 17-7PH
- Inox 17-7PH
- AISI 17-7PH
- SUS 17-7PH
- 631
- EN 1.4568
- DIN X7CrNiAl17-7
- S17700
Quality Products
Technical Data
| 17-7PH/631 Stainless Steel Standards Comparison Table | ||||||||
| STS | USA | UNS | CHINA | EURONORM | RUSSIA | SWEDISH | JAPANESE | |
| GRADE | AISI/ASTM | NO | GB | NO | NAME | GOST | SS | JIS |
| 17-7PH | 17-7PH | S17700 | 0Cr17Ni7Al 07Cr17Ni7Al | 1.4568 | X7CrNiAl17-7 | – | – | SUS 631 |
| C | Si | Mn | P | S | Cr | Ni | Al |
| 0.09 max | 1.00 max | 1.00 max | 0.040 max | 0.030 max | 16.00~18.00 | 6.5~7.75 | 0.75~1.50 |
| Grade | EN Grade | Yield Strength Rp0.2(N/mm²) | Tensile Strength Rm(N/mm²) | Hardness | Rockwell C | Elongation A50% |
| 17-7PH | 1.4568 | ≥1170 | ≥965 | Annealed | ≥38 | ≥6 |
Related Resources
17-4 PH vs. 17-7 PH Precipitation Hardening Stainless Steel Strip
Stainless steel strips 17-4 PH and 17-7 PH are two types of precipitation hardening stainless steel that belong to the Martensitic grades steel. Both 17-4 PH and 17-7 PH have the basic elements carbon, chromium, and nickel. The main difference between the two types of precipitation hardening stainless steel is that the nickel is replaced by molybdenum in 17-7 PH. This leads to a better resistance against creep, corrosion, stress relief at elevated temperatures and also makes it softer than 17-4 PH.
