SPRON is an SII brand name coined from SPRING MICRON.
SPRON
SPRON is an SII brand name coined from SPRING MICRON.
“SPRON” is a special metal (Co-Ni alloy) developed for mechanical watch springs, through collaboration with the Institute for Materials Research, Tohoku University.
It has the excellent characteristics of high elasticity, durability, corrosion resistance, and heat resistance allowing to be used in wide-range of fields, including medical materials, small precision springs, as well as springs for watches.
SPRON 510 is a strain age-hardening type Co-Ni-Cr-Mo alloy with material characteristics that are more advanced than SPRON 100.
It is non-magnetic and features ultra high elasticity and high mechanical strength, as well as high durability and heat resistance.
| Tensile strength | ～2940MPa (～300kg/mm2) |
|---|---|
| Stiffness | ～5684MPa (～580kg/mm2) |
| Elongation | 3.00% |
| Hardness | Hv.～ 800 |
| Density | 8.5 ～ 8.7g/cm3 |
| Young’s modulus | 216 ～ 225GPa (22～23X103kg/mm2) |
| Modulus of rigidity | 83.3GPa (8.5X103kg/mm2) |
| Linear expansion coefficient | 12 ～13X10-6/°C (20 ～ 50°C) |
| Electrical resistivity | 98 ～ 100µΩ-cm |
| Intensity of magnetization | 0 (5KOe) |
(Wire drawriing material: cold processing + age treatment)
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