Knowledgebase: Technical Information
What kind of stainless steel is the layer in the Falk Culinair bimetal?
Posted by Neil Corke, Last modified by Neil Corke on 20 February 2017 11:22 AM

The stainless steel layer in the Falk Culinair bimetal is only 0.2mm (200 microns) thick enough to prevent the contents of the pan reacting with the copper body without materially effecting the superior conductivity and distribution of heat in copper.  It is virtually indestructible, and unlike tin, requires no maintenance.

The stainless steel is “18/8” grade.  The number relates to the chromium and nickel contents of the steel, which are 18% chromium and 8% nickel respectively.

“18/8” is the most commonly used stainless steel.   This steel is known as 1.4301 in the European BS EN 10088 standard, or '304' (in the American AISI grade designation system).

It is an 'austenitic' type of stainless steel which is a high quality, sanitary, food grade stainless steel used in numerous food, dairy, brewing, hospital and sanitation applications all over the world.

The exact composition is:

IronChromiumNickelCarbonManganeseSiliconePhosphorusSulphurNitrogen
71.0% 18.0% 8.0% 0.08% 2.0% 0.75% 0.045% 0.03% 0.1%

Please note, there is no significant difference in the mechanical properties, or strength, between 18/8 and 18/10 stainless steels.  The 18/10 may be very slightly more ductile (i.e., slightly more able to bend without fracturing) than 18/8, but the difference is so minimal as to be completely inconsequential for our application.

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Comments (1)
Martin West
29 September 2017 03:15 PM
Thanks for the detailed technical and dimensional information about your products. So many manufacturers are reluctant to provide so much.

There is as small error in your composition table. Silicone is the common name for polysiloxanes, a polymeric molecule containing silicon and oxygen and sometimes carbon and hydrogen. Silicones are used as lubricants and to make silicone rubber used in flexible cookware and flexible spatulas resistant to high temperature. Silicon is the English name of the pure element (silicium in French and Dutch) used in metal alloys, semiconductor chips, and solar photovoltaic cells (no oxygen, carbon or hydrogen). A very common mistake unless you are a scientist or engineer.
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