UGI® 446 Annealed
UGI® 446 Annealed introduction
UGI® 446 is a ferritic stainless steel with more than 23% of chromium content. Thus its corrosion resistance is among the best within the ferritic stainless grades. As UGI® 446 stands well thermal oxidation with a good behavior against scaling off phenomena, it is commonly used for applications where temperature range is in between 800 and 1150°C.
Thermal expansion coefficient of UGI® 446 being close to special glasses ones so it is often used in metal-glass sealed junctions.
UGI® 446 is a ferritic stainless steel grade which stands well liquid metal contact like copper or brass. Thus it is well adapted to electrical applications where there are close contacts between stainless steel, copper and brass.
Long exposure to temperature in between 350 and 800°C leads to an evolution of the metallurgical structure of the material which may become brittle (sigma phase or ferrite de-mixing).
UGI® 446 has a structure 100% ferritic when annealed. This metallurgical condition ensures that the material will not be subjected to intergranular corrosion. A too long holding time at temperature into the 350-750°C range may lead to an embrittleness of the material due to the growth of brittle phases in the structure (ɑ+ ά ferrite de-mixing around 475°C and Sigma phase at higher temperature). It has to be avoided.
Equivalent material: DIN 1.4763, EN 1.4763, AFNOR X4Cr24, AISI 446, UNS S44600
UGI® 446 Annealed general
| Property |
Value |
| Density |
Density of 7.5 g/cm³ |
UGI® 446 Annealed thermal
| Property |
Value |
| Specific heat capacity |
Specific heat capacity of 500 J/(kg·K) |
| Thermal conductivity |
Thermal conductivity of 17 W/(m·K) |
UGI® 446 Annealed chemical
| Property |
Value |
Comment |
| Carbon |
Carbon of 0.06 |
max. |
| Chromium |
Chromium of 23.0 - 24.0 % |
- |
| Manganese |
Manganese of 1.0 |
max. |
| Molybdenum |
Molybdenum of 0.5 |
- |
| Nickel |
Nickel of 0.5 |
max. |
| Nitrogen |
Nitrogen of 0.1 |
max. |
| Phosphorus |
Phosphorus of 0.03 |
max. |
| Silicon |
Silicon of 0.7000000000000001 |
max. |
| Sulfur |
Sulfur of 0.03 |
max. |
UGI® 446 Annealed electrical
| Property |
Value |
| Electrical resistivity |
Electrical resistivity of 1.1e-06 Ω·m |
UGI® 446 Annealed mechanical
| Property |
Value |
Comment |
| Elastic modulus |
Elastic modulus of 220 GPa |
- |
| Elongation |
Elongation of 20 % |
min. |
| Tensile strength |
Tensile strength of 480 MPa |
min. |
UGI® 446 Annealed application
| Property |
- |
- |
| Application areas |
| Cold Forming |
| Corrosion properties |
Ferritic grades |
Pitting potential in mV/ECS |
| AISI 430 - 1.4016 |
350 mV |
| AISI 434 - 1.4113 |
400 mV |
| AISI 446 - 1.4763 |
420 mV |
| 1.4511 / 1.4509 |
470 mV |
| AISI 445 - 1.4621 |
550 mV |
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