UGI 4057 AIR QT900
UGI 4057 AIR QT900 introduction
UGI 4057 AIR is a martensitic stainless steel with Ni addition. Its 15% Cr content ensures a higher corrosion resistance than classical martensitic stainless steels like AISI 410 or 420. The balance between alloying ele-ments, Cr, Ni and C, in UGI 4057 AIR has been carefully chosen to obtain an almost fully martensitic struc-ture after austenitization (with limited amounts of retained austenite and delta ferrite) to develop full strength. This grade is employed preferentially in quench and tempered condition that offers a wide range of mechanical properties depending on the tempering temperature.
The microstructure in quench and tempered condition is fully martensitic with fine chromium carbides. The delta ferrite is nearly totally eliminated by hot rolling and austenitization (delta fraction
Type
A
B
C
D
Rating
Thin
Heavy
Thin
Thick
Thin
Thick
Thin
Thick
< 2
< 2
=< 2
< 2
=< 2
< 2
=< 2
< 2
For applications requiring an improved microcleanliness UGI 4057 AIR also exists in ESR refined version.
UGI 4057 AIR is a ferromagnetic grade at room temperature until 727°C (Curie transition). Its magnetic prop-erties are semi-hard, and are significantly changed by tempering. The evolution with tempering is shown on the graph provided in the picture part of the datasheet.
Equivalent material: DIN 1.4057, EN 1.4057, DIN X17CrNi16-2, DIN X15CrNi17-3, EN X17CrNi16-2, EN X15CrNi17-3, UNS S43100, ASTM S43100, AISI 431, JIS SUS431, AFNOR Z15CN17-03, DIN 1.4044, BS S80, SS 2321
UGI 4057 AIR QT900 general
| Property |
Temperature |
Value |
| Density |
20 °C |
Density of 7.71 g/cm³ |
| - |
100 °C |
Density of 7.69 g/cm³ |
| - |
200 °C |
Density of 7.66 g/cm³ |
| - |
300 °C |
Density of 7.64 g/cm³ |
| - |
400 °C |
Density of 7.6 g/cm³ |
UGI 4057 AIR QT900 thermal
| Property |
Value |
Comment |
| Coefficient of thermal expansion |
Coefficient of thermal expansion of 0.0000106 1/K |
20 to 100°C |
| - |
Coefficient of thermal expansion of 0.0000112 1/K |
20 to 200°C |
| - |
Coefficient of thermal expansion of 0.0000117 1/K |
20 to 300°C |
| - |
Coefficient of thermal expansion of 0.0000121 1/K |
20 to 400°C |
| Specific heat capacity |
Specific heat capacity of 460 J/(kg·K) |
- |
| Thermal conductivity |
Thermal conductivity of 25 W/(m·K) |
- |
UGI 4057 AIR QT900 chemical
| Property |
Value |
Comment |
| Carbon |
Carbon of 0.12 - 0.2 % |
- |
| Chromium |
Chromium of 15.0 - 17.0 % |
- |
| Copper |
Copper of 0.5 |
max. |
| Manganese |
Manganese of 1.0 |
max. |
| Molybdenum |
Molybdenum of 0.30000000000000004 |
max. |
| Nickel |
Nickel of 2.0 - 3.0 % |
- |
| Phosphorus |
Phosphorus of 0.025 |
max. |
| Silicon |
Silicon of 1.0 |
max. |
| Sulfur |
Sulfur of 0.005 |
max. |
UGI 4057 AIR QT900 electrical
| Property |
Value |
| Electrical resistivity |
Electrical resistivity of 7e-07 Ω·m |
UGI 4057 AIR QT900 mechanical
| Property |
Temperature |
Value |
Comment |
| Charpy impact energy, V-notch |
- |
Charpy impact energy, V-notch of 20 J |
min. |
| Elastic modulus |
20 °C |
Elastic modulus of 215 GPa |
- |
| - |
100 °C |
Elastic modulus of 212 GPa |
- |
| - |
200 °C |
Elastic modulus of 205 GPa |
- |
| - |
300 °C |
Elastic modulus of 200 GPa |
- |
| - |
400 °C |
Elastic modulus of 190 GPa |
- |
| Elongation |
- |
Elongation of 12 % |
min. diameter ≤ 100mm |
| Hardness, Brinell |
- |
Hardness, Brinell of 270.0 - 321.0 [-] |
- |
| Tensile strength |
- |
Tensile strength of 900.0 - 1080.0 MPa |
diameter ≤ 100mm |
UGI 4057 AIR QT900 application
| Property |
- |
- |
| Application areas |
| Corrosion properties |
Environment |
Behaviour/ Use |
| Nitric acid |
GOOD |
| Phosphoric acid |
Restricted use |
| Sulphuric acid |
Restricted use |
| Acetic acid |
Restricted use |
| S odium carbonate |
Average |
| NaCl (fog test) |
Average |
| Humidity |
GOOD |
| Sea water |
Restricted use |
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