DURACON® 45M – Rods and Bulk Material

The recently developed Iron-Cobalt-Nickel alloy DURACON® 45M combines high hardness and high tensile strength with an excellent thermal conductivity. This unique combination of properties makes the material attractive for the production of moulds and dies. The very high thermal conductivity allows a significant reduction of the cycle time and enhances the surface quality and the dimensional accuracy of the produced plastic parts. Furthermore, DURACON® 45M has a thermal expansion coefficient close to that of typical tool steels, which reduces thermal stress in composite moulds. Additionally, DURACON® 45M is free of Beryllium.

Advantages in comparison

Compared to classic tool alloys

  • four times higher thermal conductivity ⇒ reduction of cycle time
  • higher surface quality, better size and dimensional accuracy
  • very good corrosion resistance

Compared to Cu and CuBe alloys

  • higher hardness and tensile strength
  • similar thermal expansion to tool alloys
  • no beryllium

Compared to other special alloys

  • higher thermal conductivity
  • high corrosion resistance
  • extremely simple and reliable thermal

Special features

  • High hardness of 48 HRC
  • High tensile strength of 1300 MPa
  • Very high thermal conductivity of 82 W/(m·K)
  • Thermal expansion coefficient similar to that of typical tool steels (11 · 10-6 K-1)
  • Free of Beryllium


Cobalt 45 wt.%, Nickel 15 wt.%, Iron Balance

Delivery condition

Basic condition, age hardened on request

Form of delivery

hot rolled and hot forged rods, bars and bulk material

Properties of DURACON® 45M in comparison

Alloy Thermal conductivity
[Wm-1 K-1]
Tensile strength
[kg m-3]
1.23443 / 1.2083 11 – 35 1990 7850
CuBe2 ca. 100 670 – 1150 8090 – 8620
DURACON 45M 82 1300 8300

All data for DURACON® 45M for the age hardened condition. As a rule DURACON® 45M is delivered in the base condition (martensitic). The base condition allows the mechanical workability by e. g. turning or milling. After age hardening at 500 °C (2 hours) post-processing by grinding is possible.


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DURACON® 45M is a special alloy developed and produced by Vacuumschmelze GmbH & Co. KG (VAC), Germany. SEKELS GmbH, Germany, is an official distributor of VAC and offers DURACON® 45M ex stock.

Forms of delivery are

  •  hot rolled rods with diameters up to about 65 mm
  •  forged rods with diameters up to about 150 mm
  •  hot rolled slabs with thicknesses up to about 130 mm and widths up to about 320 – 370 mm