Firmodur 1249 QT

Alternative and trade names
Firmodur 1249, 1.1249, Cf70
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Description

1.1249 (Cf70) a quenched and tempered steel suitable for the Flame and Induction hardening. It is mainly used for components in automotive engineering, such as connecting rods, but also for components used in the rolling and bearing industry.

Related Standards

Equivalent Materials

This material data has been provided by Deutsche Edelstahlwerke Specialty Steel (DEW).

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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Properties

General

PropertyValue

Density

7.7 g/cm³

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Dimension

PropertyValueComment

Diameter

40 mm

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max.

Mechanical

PropertyValueComment

Elastic modulus

210 GPa

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Hardness, Brinell

223.0

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annealed

Reduction of area

25.0 - 30.0 %

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Tensile strength

740.0 - 930.0 MPa

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Yield strength

480.0 - 560.0 MPa

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Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100 °C

0.0000115 1/K

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for 20°C to the mentioned temperature

200 °C

0.0000125 1/K

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for 20°C to the mentioned temperature

300 °C

0.0000133 1/K

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for 20°C to the mentioned temperature

400 °C

0.0000139 1/K

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for 20°C to the mentioned temperature

Specific heat capacity

470.0 J/(kg·K)

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Thermal conductivity

42.6 W/(m·K)

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Electrical

PropertyValue

Electrical resistivity

1.9e-07 Ω·m

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Chemical properties

PropertyValue

Carbon

0.68 - 0.75 %

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Manganese

0.2 - 0.35000000000000003 %

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Phosphorus

0.025

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Silicon

0.15 - 0.35000000000000003 %

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Sulfur

0.035

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Technological properties

Property
Application areas

It is mainly used for components in automotive engineering, such as connecting rods, but also for components used in the rolling and bearing industry.

Heat Treatment

Normalizing 820-850°C (Air), Soft annealing: 650-700°C (slow cooling), Quenching: 790-820°C (Water), Tempering: 550-660°C (Oil, Polymer,Water)

Hot forming

It is formable at 800-1000°C and should be then slowly cooled.

Processing history

Quenched and Tempered

Welding

It is usually not weldable and should will not be used in welded constructions.