Firmodur 7220 QT

Alternative and trade names
Firmodur 7220, 1.7220, 34CrMo4
Want to keep this datasheet? Save it now in your required format

Description

1.7220 (34CrMo4) is a quenched and tempered steel can be used in automotive engineering, as parts of the axes, screws and fastening elements.

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.

Ashby charts

See where falls on the material property chart for against in your materials selection and design process. Our Ashby charts are interactive with more technical data upon clicking. Sign up to get access to this premium feature for free.

Properties

General

PropertyValue

Density

7.7 g/cm³

Show Supplier Material materials with Density of 7.7 g/cm³

Dimension

PropertyValueComment

Diameter

250 mm

Show Supplier Material materials with Diameter of 250 mm

max.

Mechanical

PropertyValueComment

Charpy impact energy, V-notch

40.0 - 45.0 J

Show Supplier Material materials with Charpy impact energy, V-notch of 40.0 - 45.0 J

Elastic modulus

210 GPa

Show Supplier Material materials with Elastic modulus of 210 GPa

Hardness, Brinell

223.0

Show Supplier Material materials with Hardness, Brinell of 223.0

annealed

Reduction of area

45.0 - 60.0 %

Show Supplier Material materials with Reduction of area of 45.0 - 60.0 %

Tensile strength

700.0 - 1200.0 MPa

Show Supplier Material materials with Tensile strength of 700.0 - 1200.0 MPa

Yield strength

450.0 - 800.0 MPa

Show Supplier Material materials with Yield strength of 450.0 - 800.0 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100 °C

0.0000111 1/K

Show Supplier Material materials with Coefficient of thermal expansion of 0.0000111 1/K

for 20°C to the mentioned temperature

200 °C

0.0000121 1/K

Show Supplier Material materials with Coefficient of thermal expansion of 0.0000121 1/K

for 20°C to the mentioned temperature

300 °C

0.0000129 1/K

Show Supplier Material materials with Coefficient of thermal expansion of 0.0000129 1/K

for 20°C to the mentioned temperature

400 °C

0.0000135 1/K

Show Supplier Material materials with Coefficient of thermal expansion of 0.0000135 1/K

for 20°C to the mentioned temperature

Specific heat capacity

470.0 J/(kg·K)

Show Supplier Material materials with Specific heat capacity of 470.0 J/(kg·K)

Thermal conductivity

42.6 W/(m·K)

Show Supplier Material materials with Thermal conductivity of 42.6 W/(m·K)

Electrical

PropertyValue

Electrical resistivity

1.9e-07 Ω·m

Show Supplier Material materials with Electrical resistivity of 1.9e-07 Ω·m

Chemical properties

PropertyValue

Carbon

0.30000000000000004 - 0.37 %

Show Supplier Material materials with Carbon of 0.30000000000000004 - 0.37 %

Chromium

0.9 - 1.2 %

Show Supplier Material materials with Chromium of 0.9 - 1.2 %

Manganese

0.6000000000000001 - 0.9 %

Show Supplier Material materials with Manganese of 0.6000000000000001 - 0.9 %

Molybdenum

0.15 - 0.30000000000000004 %

Show Supplier Material materials with Molybdenum of 0.15 - 0.30000000000000004 %

Phosphorus

0.025

Show Supplier Material materials with Phosphorus of 0.025

Silicon

0.4

Show Supplier Material materials with Silicon of 0.4

Sulfur

0.035

Show Supplier Material materials with Sulfur of 0.035

Technological properties

Property
Application areas

It is used in automotive engineering, as parts of the axes, screws and fastening elements.

Heat Treatment

Normalizing 840-880°C (Air), Soft annealing: 680-720°C (Air, slow cooling), Quenching: 830-890°C (Water, Oil, Polymer), Tempering: 540-680°C (Air)

Hot forming

It is formable at 850-1100°C and should then cooled slowly.

Processing history

Quenched and Tempered

Welding

It is difficult to weld and should will not used be in welded constructions.