UGI®347H – UGI®4550
UGI®347H – UGI®4550 introduction
UGI®347H / UGI®4550 is an austenitic stainless steel stabilized with niobium (Nb) specifically intended for use at high temperature (up to 850°C). UGI®347H / UGI®4550 has better mechanical properties at high temperature and better intergranular corrosion resistance than 304/1.4301 if it is used at between 450 and 850°C.
Micro structure: The micro structure of UGI®347H / UGI®4550 consists of an austenitic matrix. Niobium is present in the form of carbide precipitates or niobium nitrides. Depending on the diameter, some residual ferrite may remain. Example of the microstructure you can find on the right side of the material page.
Equivalent material: EN 1.4550, DIN 1.4550, AFNOR X6CrNiNb18-10, AISI 347H, JIS SUS347, ASTM Type 347, UNS S34700, ASTM Type 347H, UNS S34709
UGI®347H – UGI®4550 general
| Property |
Value |
| Density |
Density of 7.9 g/cm³ |
UGI®347H – UGI®4550 thermal
| Property |
Value |
Comment |
| Coefficient of thermal expansion |
Coefficient of thermal expansion of 0.000016 1/K |
20 to 100°C |
| - |
Coefficient of thermal expansion of 0.0000165 1/K |
20 to 200°C |
| - |
Coefficient of thermal expansion of 0.000017 1/K |
20 to 300°C |
| - |
Coefficient of thermal expansion of 0.0000175 1/K |
20 to 400°C |
| - |
Coefficient of thermal expansion of 0.000018 1/K |
20 to 500°C |
| Specific heat capacity |
Specific heat capacity of 500 J/(kg·K) |
- |
| Thermal conductivity |
Thermal conductivity of 15 W/(m·K) |
- |
UGI®347H – UGI®4550 chemical
| Property |
Value |
Comment |
| Carbon |
Carbon of 0.04 - 0.06 % |
- |
| Chromium |
Chromium of 17.0 - 19.0 % |
- |
| Copper |
Copper of 0.75 |
max. |
| Manganese |
Manganese of 0.5 - 2.0 % |
- |
| Molybdenum |
Molybdenum of 0.7000000000000001 |
max. |
| Nickel |
Nickel of 9.0 - 11.0 % |
- |
| Niobium |
Niobium of 0.4 - 1.0 % |
max. & min: 10xC |
| Phosphorus |
Phosphorus of 0.035 |
max. |
| Silicon |
Silicon of 0.2 - 0.75 % |
- |
| Sulfur |
Sulfur of 0.015 |
max. |
UGI®347H – UGI®4550 electrical
| Property |
Value |
| Electrical resistivity |
Electrical resistivity of 7.3e-07 Ω·m |
UGI®347H – UGI®4550 mechanical
| Property |
Temperature |
Value |
Comment |
| Charpy impact energy, V-notch |
-196 °C |
Charpy impact energy, V-notch of 80 J |
min. |
| - |
20 °C |
Charpy impact energy, V-notch of 100 J |
min. |
| Elastic modulus |
20 °C |
Elastic modulus of 200 GPa |
- |
| - |
100 °C |
Elastic modulus of 194 GPa |
- |
| - |
200 °C |
Elastic modulus of 186 GPa |
- |
| - |
300 °C |
Elastic modulus of 179 GPa |
- |
| - |
400 °C |
Elastic modulus of 172 GPa |
- |
| - |
500 °C |
Elastic modulus of 165 GPa |
- |
| Elongation |
- |
Elongation of 40 % |
min. |
| Hardness, Brinell |
- |
Hardness, Brinell of 230.0 [-] |
max., HBW |
| Tensile strength |
- |
Tensile strength of 540.0 - 740.0 MPa |
- |
UGI®347H – UGI®4550 application
| Property |
- |
- |
| Application areas |
| Cold Forming |
| Corrosion properties |
Grades |
Pitting potential to ISO 15158 |
| UGI®347H |
240+/-20 mV/ECS |
Cr = 18%; Ni = 9%; S = 60 ppm
1.4301 |
220+/- 5 mV/ECS |
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