UGI® S302 Spring
UGI® S302 Spring introduction
UGI® S302 is the grade conventionally used to manufacture stainless steel springs. This grade offers good corrosion resistance and can be used at temperature levels close to 250°C. Springs in UGI® S302 have good fatigue strength and low relaxation compared with carbon steels.
For springs used in corrosive environments, UGI® S302 makes it possible to avoid the surface protection needed on carbon steel springs. To adapt to various cold transformation conditions, Ugitech has developed several versions of UGI® S302, such as UGI® S302-1, UGI® S302-2, and UGI® S302-6 to cover several CWH values (Cold Work Hardening factors). For applications which require high dynamic fatigue performances, a special grade is available on request: UGI® S302 HFS (HFS for High Fatigue Strength).
These Rm values are in conformance with the standard mechanical strength range indicated in Euronorm EN 10270-3 for grade 1.4310 (NS). The Rp 0.2 values are given as an indication.
The Rm/Rp 0.2 ratio on spring wires in UGI® S302 is generally around 0.9.
The range of strength (Rm) values is generally contained
within a manufacturing batch, at 100 MPa;
within a packaging unit (cable drums, coils, rims) at 60 Mpa.
The grade's magnetic permeability (µr) is heavily influenced by cold transformation of the material. In the solu-tion-annealed and non-cold-worked state, µr is less than 1.02, but in the cold-worked state with spring-wire properties, it can rise to a maximum of 10.
Equivalent material: DIN 1.4310, EN 1.4310, DIN X9CrNi18-8, EN X9CrNi18-8, AISI 302, UNS S30200, JIS SUS302
UGI® S302 Spring general
| Property |
Temperature |
Value |
| Density |
20 °C |
Density of 7.9 g/cm³ |
| - |
100 °C |
Density of 7.9 g/cm³ |
| - |
250 °C |
Density of 7.9 g/cm³ |
UGI® S302 Spring thermal
| Property |
Temperature |
Value |
Comment |
| Coefficient of thermal expansion |
- |
Coefficient of thermal expansion of 0.0000165 1/K |
20 to 100°C |
| - |
- |
Coefficient of thermal expansion of 0.0000175 1/K |
20 to 200°C |
| Max service temperature |
- |
Max service temperature of 250.0 °C |
- |
| Specific heat capacity |
- |
Specific heat capacity of 500 J/(kg·K) |
- |
| Thermal conductivity |
20 °C |
Thermal conductivity of 15 W/(m·K) |
- |
| - |
100 °C |
Thermal conductivity of 16 W/(m·K) |
- |
| - |
250 °C |
Thermal conductivity of 18 W/(m·K) |
- |
UGI® S302 Spring chemical
| Property |
Value |
Comment |
| Carbon |
Carbon of 0.05 - 0.15 % |
- |
| Chromium |
Chromium of 16.0 - 19.0 % |
- |
| Manganese |
Manganese of 2.0 |
max. |
| Molybdenum |
Molybdenum of 0.8 |
max. |
| Nickel |
Nickel of 6.0 - 9.5 % |
- |
| Nitrogen |
Nitrogen of 0.11 |
max. |
| Phosphorus |
Phosphorus of 0.045 |
max. |
| Silicon |
Silicon of 1.0 |
max. |
| Sulfur |
Sulfur of 0.015 |
max. |
UGI® S302 Spring magnetic
| Property |
Value |
| Relative magnetic permeability |
Relative magnetic permeability of 10 [-] |
UGI® S302 Spring electrical
| Property |
Temperature |
Value |
| Electrical resistivity |
20 °C |
Electrical resistivity of 0.00000078 Ω·m |
| - |
100 °C |
Electrical resistivity of 0.00000083 Ω·m |
| - |
250 °C |
Electrical resistivity of 0.00000090 Ω·m |
UGI® S302 Spring mechanical
| Property |
Temperature |
Value |
Comment |
| Elastic modulus |
20 °C |
Elastic modulus of 200 GPa |
- |
| - |
100 °C |
Elastic modulus of 194 GPa |
- |
| - |
200 °C |
Elastic modulus of 183 GPa |
- |
| Tensile strength |
- |
Tensile strength of 1250.0 - 2530.0 MPa |
depending on the diameter |
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