CL 91RW (Metal / Warmarbeitsstahl / hot work steel)

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Concept Laser


Stainless hot-work steel with heat treatment
Used for production of mould components for high volume injection moulding; can also be used for stainless functional components with high loads. Tool inserts with conformal cooling for the production of medical or chirurgical instruments as well as for packaging used in food and pharmaceutical industries. By using a special heat treatment a higher elongation can be achieved. Displays a homogeneous, dense structure.

State of starting material


Properties, applications and appearance

Field of application

Rapid Manufacturing, Rapid Tooling


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Manufacturing process

Laser Melting
Parts are built in a metal powder bed through a laser (or lasers) melting the metal powder layer-by-layer. Synonyms: Selective Laser Melting, SLM, Direct Metal Laser Sintering, DMLS, Laser Cusing

Physical, mechanical and thermal properties

Mechanical Properties

ultimate tensile strenght: 1,700 MPa
yield stress Rp 0.2%: 1,600 MPa
tensile modulus (Young's / E- ): 200,000 MPa
elongation at break: 2 %

Thermal Properties

thermal conductivity: 18 W/m °C

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Data source: Concept Laser

ATTENTION: The presented values are provided by the material manufacturers and are only indicative. Realized material properties may differ from these value for several reasons. Additively does not guarantee the correctness of this information in any way.