Datasheet updated

2024-04-19 14:18
(supersedes all previous editions)

Alleima® 7C27Mo2 is a martensitic stainless chromium steel alloyed with molybdenum, supplied in strip form. It is mainly supplied in hardened and tempered condition, characterized by:

  • Very high corrosion resistance
  • High toughness
  • Excellent fatigue strength properties.

Alleima® 7C27Mo2 can also be supplied in soft condition, annealed or cold rolled for good formability.


  • ASTM: F899-23
  • UNS: S42026
  • ISO: 16061-2015

Chemical composition (nominal)

Chemical composition (nominal) %
C Si Mn P S Cr Mo
0.38 0.4 0.6 ≤0.025 ≤0.010 13.5 1.0


Alleima® 7C27Mo2 is an excellent choice for bone saws and other medical edge applications.

Forms of supply

The strip can be supplied either in coils or as straightened lengths of 0.5 - 4.0 meter (1.6 - 13.1 feet). The coil weight is max 5 kg/mm (280 lb/in.) of strip width.

Hardening and tempering of the strip steel is necessary to achieve the correct finish and to meet the properties required by the end user.

Thickness Width
mm (in.) mm (in.)
min. max. min. max.
0.10 (0.0039) 2.5 (0.098) 5 (0.197) 350 (14)

Other sizes can be supplied to meet specific requirements.


The thickness and width tolerances are +/- tolerances to the nominal size. The normal tolerance classes for most of our strip products are T2 and B1. Tighter tolerances as well as other tolerance limits can be offered upon request.

Heat treatment


As rapid as possible, for optimal result 600°C (1110°F) should
be reached within 2 minutes or less.

Temperature should be equalized at 850°C (1560°F) for 30
minutes to avoid unnecessary temperature variations.


Batch furnace. 30 minutes in furnace.


As rapid as possible, for optimal result 600°C (1110°F) should
be reached within 2 minutes or less.

Mechanical properties

As-delivered Tensile strength Rm Hardness
MPa (ksi) HV HRB
Annealed max 800 (116) max 275 max 103
Cold rolled 850-1000 (123-145) 275-315 103-108
Hardened & tempered 1600-1900 500-600 50-55 HRC

Note : Alleima® 7C27Mo2 can be supplied in high tensile condition (up to 2000MPa).

Physical properties

The physical properties of a steel are related to a number of factors, including alloying elements, heat treatment and manufacturing route, but the data presented below can generally be used for rough calculations.

Density : 7,7 g/cm3 (0.28 lb/in.3)

Disclaimer: Alleima is not providing any products or services that are intended or may be construed to be recommending or otherwise advising on, in any manner, the design, suitability, appropriateness or effectiveness, from a medical/biological/safety perspective, of any medical material, instrument and/or medical device.