X35 ST +
100% martensitic stainless steel, the X35 ST+ is developed for the manufacture of watch movement components. It offers excellent skills for bar turning, cutting, polishing and rolling. The X35 ST+ can replace traditional stainless steel as well as leaded and lead-free steels, and will also offer very good corrosion resistance.
Main fields of application of X35 ST +
Many diverse and varied components are now prescribed in X35 ST+ by watch manufacturers: screws, screw feet, studs, winding rods, nucleus, ratchet, barrel shaft, second pinion, balance pin, pins, various other pinions and pins.
Chemical composition of X35 ST +
| C | 0.50 max | S | 0.15 min |
|---|---|---|---|
| Mn | 1.50 max | Cr | 12 - 14 |
| P | 0.06 max | Mo | 0.60 max |
Mechanical properties of X35 ST +
| before heat treatment | after heat treatment | ||
|---|---|---|---|
| Hardness: | approx. 220 HV | Hardness: | 670 -700 HV (58-60) HRC |
| Rm: | approx. 820 N/mm² | Possible: | 550-580 HV (with adapted |
| Rp0.2: | approx. 740 N/mm² | tempering temperature) |