Alleima® 15R10 is an austenitic chromium-nickel (CrNi) stainless steel used as a base material for Alleima coated strip steel. The product is particularly suited to many types of electric load carrying spring applications, such as contact springs and tactile domes.
Alleima® 15R10 is characterized by good corrosion resistance, mechanical strength and excellent fatigue and relaxation properties, as well as superior contact properties and/or solderability, achieved through the right choice of coating layer.
Standards
- ASTM: (301)
- EN Number: 1.4310
- EN Name: X 10 CrNi 18-8
Chemical composition (nominal)
| C | Si | Mn | P | S | Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|---|
| 0.05 - 0.15 | ≤1.50 | ≤2.00 | ≤0.045 | ≤0.015 | 16.00 - 19.00 | 6.00 - 9.50 | ≤0.80 | ≤0.11 |
Applications
Alleima® 15R10 is a suitable material for high strength components that require electronic conduction on or close to the surface. Typical applications include contact springs, tactile domes and various EMC shielding components, such as fingerstocks and shielding boxes.
Corrosion resistance
Good corrosion resistance is extremely important in spring applications to ensure that spring properties are not impaired. Alleima® 15R10 is based on an austenitic stainless steel substrate, which gives good corrosion protection in most spring applications. Compared with other low alloyed spring steel Alleima® Santronic 15R10 offers superior performance. However, all austenitic steels of this type are susceptible to stress corrosion cracking (SCC) when in contact with chloride-containing solutions at elevated temperatures.
Forms of supply
Alleima® Santronic 15R10 is supplied, as standard, in the cold rolled condition with a coating on either one or both sides and shipped in coils.
Substrate dimensions
The following thicknesses and widths can be supplied as standard.
| Thickness range | Width | ||
|---|---|---|---|
| mm | in. | mm | in. |
| 0.04 - 0.8 | 0.0016 - 0.0315 | 6 - 650 | 0.24 - 25.6 |
Coatings
See Alleima® Santronic surface coatings.
Surface finish
Alleima® Santronic 15R10 strip is normally supplied with a bright, cold rolled finish. Different surface brightness levels at intervals between 20-60% (reflectance value measured at a 60o angle in compliance with DIN 67530) can be supplied to meet individual customer requirements.
| Sandvik surface class | Class limits, Ra | Class mean, Ra | ||
|---|---|---|---|---|
| µm | µin. | µm | µin. | |
| Y6 | 0.2 - 0.5 | 0.008 - 0.020 | 0.32 | 0.013 |
| Y7 | 0.1 - 0.25 | 0.004 - 0.010 | 0.16 | 0.006 |
| Y8 | < 0.125 | < 0.005 | 0.08 | 0.003 |
Mechanical properties
| Tensile strength*, Rm |
Proof strength, Rp0.2 |
Rp0.2/Rm | Elongation, A |
||
|---|---|---|---|---|---|
| MPa | ksi | MPa | ksi | % | |
| 1400 | 203 | 1200 | 174 | 0.86 | 12 |
| 1700 | 247 | 1600 | 232 | 0.94 | 1.5 |
| 1900 | 276 | 1850 | 268 | 0.97 | 1.0 |
| 2050 | 297 | 2000 | 290 | 0.97 | 0.3 |
* Other tensile strength levels available on request.
Physical properties
Density: 7.9 g/cm3, 0.29 lb/in3
Resistivity: 0.8 μΩm (31.5 μΩin.)
Specific heat capacity: 500 J/kg °C (at 20°C/68°F)
Modulus of elasticity (x103): 185 MPa, 26 825 ksi (at 20°C/68°F)
| Temperature, °C | per °C | Temperature, °F | per °F |
|---|---|---|---|
| 20 - 100 | 15.5 | 68 - 200 | 8.5 |
| 20 - 200 | 16 | 68 - 400 | 9 |
| 20 - 300 | 16.5 | 68 - 550 | 9 |
| Temperature, °C | W/m °C | Temperature, °F | Btu/ft h °F |
|---|---|---|---|
| 20 | 15 | 68 | 8.5 |
| 100 | 16 | 200 | 9 |
| 300 | 19 | 600 | 11 |
Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Alleima materials.