NAS 631； Precipitation Hardened High Strength Stainless Steel for Springs
Characteristics of NAS 631
・NAS 631 can be further hardened by cold rolling or sub-zero treatment to transform to martensite, or by precipitation hardening of Al compound.
・Hardening after forming makes further strengthened parts.
・NAS 631 is comparable to 17-7PH (17%Cr-7%Ni precipitation hardened) stainless steel.
Chemical Composition
(%)
| - | C | Si | Mn | P | S | Ni | Cr | Al |
| Specification | ≦0.09 | ≦1.00 | ≦1.00 | ≦0.040 | ≦0.030 | 6.50～ 7.75 |
16.00～ 18.00 |
0.75～ 1.50 |
| Example | 0.081 | 0.30 | 0.92 | 0.025 | 0.0006 | 7.24 | 16.31 | 1.06 |
Mechanical Properties
| - | Dimension (mm) (Thickness x Width) |
Finish | 0.2% Proof stress （MPa） |
Tensile strength （MPa） |
Elongation （％） |
Hardness （HV） |
| Examples | 0.2×110 | 2D | 255 | 865 | 31 | 159 |
| 0.2×250 | 3/4H | - | 1325 | 7 | 422 | |
| 0.2×218 | 3/4H | - | 1306 | 8 | 426 |
Application
Various kinds of springs
Torsion bar
Stabilizer
