(supersedes all previous editions)
Alleima® 12C27M is a martensitic stainless chromium steel developed for the manufacture of kitchen tools with high demands on wear- and corrosion resistance properties. After heat treatment the grade is characterized by:
Typical applications for Alleima® 12C27M are kitchen tools, such as different types of knives and scissors, that need to tolerate dish-washing.
In brackets, nearest corresponding grade.
The material can be supplied either in coils or as straightened lengths of 0.5–4.0 meter (20 - 157 in.). The maximum coil weight is 5 kg/mm (280 lbs/in.) of the strip width.
Hardening and tempering of the strip steel is needed to achieve the correct finish and to meet the properties required by the end user.
|mm (in.)||mm (in.)|
|1.0 (0.039)||4.5 (0.177)||10 (0.394)||380 (14.96)|
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.
max. 700 (102)
|max. 215||max. 94.3|
750 ±100 (109±14)
|235 ±35||97.4 ±6|
* Hardness data is for guidance only.
Hardening temperature 1080°C (1975°F), strip thickness 2.5 mm (0,098 in.), holding time 5 minutes, quenching in oil.
Tempering time 30 minutes.
Brittleness occurs with tempering above 450°C (840°F).
Additional recommendations regarding hardening can be found in Alleima's hardening guide.
The following figures show the importance of using the right hardening conditions to optimize the microstructure and 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.
Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Alleima materials.