Technical Information - hardened tool steel 1075 + Cr

Basic Information and Applications 1075 + Cr

A small addition of about 0.40% chromium leads to a higher wear resistance and better hardenability with large cross-sections in this carbon steel.
With a Rockwell hardness of 47-51 HRC, this material is also suitable for smaller tools.
Available in formats with the dimensions 350x1000 or 610x1220 in some thicknesses, different formats are also possible (see section 5).

In the thickness range between 0.02 and 3.00 mm, the hardened spring band steel material no. 1.1274 available.

Delivery condition

Condition: hardened and tempered (martensitic structure)
Surface: not polished, roughness class Ra 0.30 - 0.60 µm (imprint of the work roll)
Flatness: max. 0.20% of the bandwidth
Hardness: 48-50 HRC

Tolerances

Thickness tolerance: usually +/- 0.03mm
Width tolerance: B2
Straightness: normal

mechanical Details

Yield strength Rp0.2: about 90% of the tensile strength
Elongation A 80: no values ​​available

The highest application temperature should not exceed 200 ° C. Please note that the values ​​for the modulus of elasticity decrease with increasing temperature.
At higher temperatures of up to around 350 ° C, we recommend the use of stainless, hardened steels such as the materials 1.4031 Mo (up to 0.80 mm thick) and 1.4034 (from 1.0 to around 10.00 mm thick).

Alloy Designations

Material - Composition*

* for the exact composition can be documented in the form of a test certificate 3.1 (according to DIN 10 204) for each batch.

Physical Information

The above information can also be used as a guide for material 1.2003 (75Cr1).

Processing information 1075 + Cr

Punching: Due to the high strength, punching is not recommended. Instead of punching, the parts should be laser or water jet cut.

Laser cutting: The melting of the steel on the cutting edge can locally lead to a higher hardness and thus reduced toughness at the cutting edge. A cut with a water jet is recommended for critical parts.

Etching: Because the tape is more than 1.00 mm thick, etching is not economical.

Bending: 

The band structure is changed by the hardening process. The rolling direction does not have to be taken into account when edging:

Bending radius:

- at least 10 times the tape thickness

Springback:

As the springback depends on various factors, bending tests should be carried out. As a guide, an angle of 10 ° for a tape thickness of 0.20 mm and an angle of 20 ° for a tape thickness of 0.60 mm can be assumed.

Surface grinding: The material 1.2003 is magnetizable and can therefore be clamped on magnetic clamping plates of grinding machines.

Welding: Due to the high carbon content of around 0.75%, the material 1075 should not be welded.

Corrosion Resistance: Unalloyed steels are not resistant to corrosion. We deliver these grades with a light film of oil. When used in a normal environment, these steels must be protected against corrosion with paint or tin / zinc plating.

Important NOTE

The technical information listed above or the information provided on the nature or use of the materials serve for description and are not a guarantee of properties. The information with which we want to advise you corresponds to our experience and that of our upstream suppliers. We cannot guarantee the results of processing and application. (03/2024)