Firmodur 1213 QT – Premium Quenched & Tempered Steel for Automotive Applications
1.1213 (Cf53) is a quenched and tempered steel suitable for the flame and Induction hardening. It mainly used in the automotive industry such as axle parts.
Properties
General
| Property | Value |
|---|---|
Density | 7.7 g/cm³ |
Dimension
| Property | Value | Comment |
|---|---|---|
Diameter | 100 mm | max. |
Mechanical
| Property | Value | Comment |
|---|---|---|
Elastic modulus | 210 GPa | |
Elongation | 12 - 15 % | A5 |
Hardness, Brinell | 223 [-] | annealed |
Reduction of area | 25 - 40 % | |
Tensile strength | 640 - 880 MPa | |
Yield strength | 400 - 510 MPa |
Thermal
| Property | Temperature | Value | Comment |
|---|---|---|---|
Coefficient of thermal expansion | 100 °C | 1.15e-05 1/K | for 20°C to the mentioned temperature |
200 °C | 1.25e-05 1/K | for 20°C to the mentioned temperature | |
300 °C | 1.33e-05 1/K | for 20°C to the mentioned temperature | |
400 °C | 1.39e-05 1/K | for 20°C to the mentioned temperature | |
Specific heat capacity | 470 J/(kg·K) | ||
Thermal conductivity | 42.6 W/(m·K) |
Electrical
| Property | Value |
|---|---|
Electrical resistivity | 1.9e-07 Ω·m |
Chemical properties
| Property | Value |
|---|---|
Carbon | 0.5 - 0.57 % |
Iron | Balance |
Manganese | 0.4 - 0.7 % |
Phosphorus | 0.025 % |
Silicon | 0.15 - 0.35 % |
Sulfur | 0.035 % |
Technological properties
| Property | ||
|---|---|---|
| Application areas | It mainly used in the automotive industry such as axle parts. | |
| Heat Treatment | Normalizing 830-860°C (Air), Soft annealing: 650-700°C (slow cooling), Quenching: 805-835°C (Water) or 815-845°C (Oil, Polymer), Tempering: 550-660°C (Oil, Polymer, Water) | |
| Hot forming | It is formable at 850-1050°C | |
| Processing history | Quenched and Tempered | |
| Welding | It is usually not weldable and should will not be used in welded constructions. | |
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