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Steel
42CrMo4 / C45

Quenched and Tempered Steel

Quenched and tempered steels like C45 and 42CrMo4 combine high strength with toughness – typical for shafts, gears, and high-load machine parts.

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Suitable machines
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Brief definition

Quenched and Tempered Steel

Quenched and tempered steels are hardened and then tempered to achieve high strength along with good toughness. Typical grades include C45, 34CrNiMo6, and 42CrMo4 (1.7225). Machinability changes significantly depending on the heat-treated state – tool selection and cutting data must be adjusted accordingly.
C45
42CrMo4 (1.7225)
34CrNiMo6
+QT = Quenched and Tempered
Properties
Density

7.85 g/cm³

As with all steel grades

Tensile Strength

Approx. 650–1,200 MPa

Depending on grade and heat-treated state

Machinability

Medium

Depending on hardness and microstructure

Machining

Challenge and solution

  • Challenge

    Hardness and Tool Wear

    Cutting forces and wear increase in the quenched and tempered state.

    Our Solution

    Adapted Cutting Data

    Tools and cutting data are optimized for the specific grade and strength.

  • Challenge

    Distortion During Heat Treatment

    Components can deform during the hardening and tempering process.

    Our Solution

    Allowance and Coordination

    We work with you to define which dimensions are achieved before and which after treatment.
Machining

How we machine this material

For quenched and tempered steels, we match the tools and cutting data to the specific heat-treated state. We coordinate with you to determine which dimensions are machined before and which after heat treatment, planning the machining allowance accordingly.

  • Cutting data based on heat-treated state
  • Allowance planning for heat treatment
  • In-fixture measurement

Manufacturing

Suitable processes

CNC Milling

CNC milling at FORMA Maschinenbau: Milled parts up to 24 m length, 5-axis simultaneous machining, and 5-axis milling for single parts and series from the Münsterland region.
  • Up to 24,000 mm component length
  • 5-axis simultaneous
  • More About This Service

Machine allocation

Approved Quenched and Tempered Steel for

CNC-Bearbeitung bei Forma Maschinenbau in Borken-Weseke
DMG MORI

DMG MORI CTX2500-1250

Turning length
1,250 mm
Axes
2 axes + Y-axis
Size Class
Up to 2 m
Technical Data →

Applications

Where Quenched and Tempered Steel it is used

For us, quality is not just a word, but measurable reality. Through state-of-the-art testing equipment such as laser interferometers and 3D measurement technology, we ensure that every component precisely meets specifications.

Construction machinery

Construction Machinery

Large Components, Structural Steelwork

Mining

Wear-Resistant Large Components

Frequently asked questions

FAQ Quenched and Tempered Steel

Which quenched and tempered steels do you process?

Among others, C45, 42CrMo4, 34CrNiMo6, and comparable grades – either quenched and tempered or in the as-delivered state. We can review other grades on a case-by-case basis.

Do you machine before or after heat treatment?

Both are possible. We coordinate with you to determine which dimensions are machined before and which after heat treatment.

Do you provide material certificates?

Yes. Upon request, we provide material certificates as well as inspection reports with batch traceability.

Inquiry

Request a component made of this material

Please specify the alloy, wall thicknesses, and tolerances. We provide realistic estimates for machining time and tooling costs.
Inquire about material
+49 2862 58787-0

Your contact person

Norbert Groß-Onnebrink

Executive Management
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