While chromium steel, also known as stainless steel, is believed to be a relatively recent innovation, new research shows that the ancient Persians had already stumbled upon an early version of this alloy around 1,000 years ago.
The finding is still important, since for decades materials scientists, archaeologists, and historians have considered stainless steel to be a twentieth-century innovation.
The study, published in the Journal of Archaeological Science and carried out by researchers from University College London (UCL), was made with the help of various medieval Persian manuscripts, which led the authors to move to an archaeological site in Chahak, southern Iran.
Microscopic appearance of chrome steel. UCL Archeology.
It all started in the 11th century