General Description
17-7PH stainless steel (UNS S17700/SUS 631), is a precipitation-hardening stainless steel featured with high strength, high hardness, excellent fatigue properties, good corrosion resistance and good formability.
17-7PH stainless steel is the best choice for making springs. It has strong corrosion resistance and high tensile strength. It can reach 2000MPA or higher after aging treatment. The most important thing is that the strength is not weaken during long-term usage. This fatigue resistance is due to the addition of AL as a precipitation hardening effect, making the 17-7ph stainless steel a semi-austenitic and semi-martensitic stainless steel.
Chemical Composition
| Grade | Fe% | Ni% | Cr% | C% | Mn% | Si% | P% | S% | Al% |
|---|---|---|---|---|---|---|---|---|---|
| 17-7PH | Bal. | 6.50-7.75 | 16.00-18.00 | Max 0.09 | Max 1.0 | Max 1.0 | Max 0.035 | Max 0.03 | 0.75-1.50 |
Designations
UNS S17700
Werkstoff Nr. 1.4564
AISI 631
Specifications
17-7PH Wire: AMS 5678
17-7PH Bar: AMS 5644
17-7PH Sheet/Strip/Plate: AMS 5528
Physical Properties
| Condition | Density kg/m3 |
Resistivity μΩ.m |
| A | 7810 | 0.800 |
| TH1050 | 7650 | 0.825 |
| RH950 | 7650 | 0.830 |
| CH900 | 7670 | 0.838 |
Mechanical Property
| Condition | UTS MPa |
0.2% YS MPa |
Elongation % | Hardness |
| A | 893 | 274 | 35 | B85 |
| TH1050 | 1370 | 1280 | 9 | C43 |
| C | 1517 | 1310 | 5 | C43 |
| RH950 | 1620 | 1510 | 6 | C48 |
| CH900 | 1820 | 1890 | 2 | C49 |
Forms
Wire available from 0.1mm, in coil or precision ground cut lengths
Strip thickness from 0.03mm
Bar and sheet are also available