Bionic Vault Structuring

Bionic vault-structuring is a method to generate a three-dimensional pattern in metallic sheets. Thanks to the controlled self-organization arrangement, a minimum of plastic deformation is required for forming the patterns. Because of their high rigidity, vault-structured, hexagonally or three-dimensional facet-structured components can be produced in stainless steel with greatly reduced wall thickness.
Vault-structured materials, even if thin and lightweight, are highly resistant to bending and to stress caused by thermal expansion, and they have other advantageous properties with application potential for lightweight structures. When flow bypasses three-dimensional profiled surfaces, there is a higher convective heat and mass-transfer coefficient compared to smooth surfaces.

From: http://www.solaripedia.com/713/19/material.html

Stainless Steel wiki definition

In metallurgy, stainless steel, also known as inox steel or inox from French "inoxydable", is a steel alloy with a minimum of 10.5%^[1] chromium content by mass.
Stainless steel does not readily corrode, rust or stain with water as ordinary steel does. However, it is not fully stain-proof in low-oxygen, high-salinity, or poor air-circulation environments.^[2] There are different grades and surface finishes of stainless steel to suit the environment the alloy must endure. Stainless steel is used where both the properties of steel and corrosion resistance are required.
Stainless steel differs from carbon steel by the amount of chromium present. Unprotected carbon steel rusts readily when exposed to air and moisture. This iron oxide film (the rust) is active and accelerates corrosion by forming more iron oxide; and, because of the greater volume of the iron oxide, this tends to flake and fall away. Stainless steels contain sufficient chromium to form a passive film of chromium oxide, which prevents further surface corrosion by blocking oxygen diffusion to the steel surface and blocks corrosion from spreading into the metal's internal structure, and, due to the similar size of the steel and oxide ions, they bond very strongly and remain attached to the surface.^[3]
Passivation occurs only if the proportion of chromium is high enough and oxygen is present.

From http://en.wikipedia.org/wiki/Stainless_steel