Firmodur 7225 QT

Alternative and trade names
Firmodur 7225, 1.7225, 42CrMo4
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Description

1.7225 (42CrMo4) is a quenched and tempered steel that mainly used in automotive and vehicle construction. Because of its high strength is suitable for highly stressed components, such as steering knuckles, connecting rods, crankshafts, gear shafts, gears or pinions. Can also be used in mechanical engineering universally in the hardened and tempered and additionally surface-hardened condition.

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

250 mm

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max.

Mechanical

PropertyValueComment

Charpy impact energy, V-notch

35.0 J

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Elastic modulus

210 GPa

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Hardness, Brinell

195.0 - 300.0 [-]

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Depending on the delivery condition

Reduction of area

40.0 - 55.0 %

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Tensile strength

750.0 - 1300.0 MPa

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Yield strength

500.0 - 900.0 MPa

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Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100 °C

0.0000111 1/K

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for 20°C to the mentioned temperature

200 °C

0.0000121 1/K

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for 20°C to the mentioned temperature

300 °C

0.0000129 1/K

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for 20°C to the mentioned temperature

400 °C

0.0000135 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

0.38 - 0.45 %

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Chromium

0.9 - 1.2 %

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Manganese

0.6000000000000001 - 0.99 %

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Molybdenum

0.15 - 0.30000000000000004 %

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Phosphorus

0.025

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Silicon

0.4

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Sulfur

0.035

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Technological properties

Property
Application areas

It is mainly used in automotive and vehicle construction for highly stressed components, such as steering knuckles, connecting rods, crankshafts, gear shafts, gears or pinions.

Heat Treatment

Normalizing 840-880°C (Air), Soft annealing: 680-720°C (Oven, slow cooling), Quenching: 820-860°C (Oil, Water), Tempering: 540-680°C (Air)

Hot forming

It is formable at 850-1100°C.

Processing history

Quenched and Tempered

Welding

It is difficult to weld and should will not used be in welded constructions. If welding is not an issue, the demanding requirements of welding filler by material manufacturers must be taken into account.. The main temperature is increased by heat treatment to equalize the structural condition.