How a Sheffield metallurgist noticed something others missed — and changed the world

Every August marks a quiet but world-changing milestone. In August 1913, a routine experiment in a Sheffield steelworks led to the creation of a material that would go on to shape modern life. What began as an attempt to improve gun barrel steel became the accidental discovery of stainless steel — a breakthrough that continues to influence industries more than a century later.

From Modest Beginnings

Harry Brearley came from a modest background and left school at an early age. Despite limited formal education, he developed a deep interest in metals and chemistry, working his way up through Sheffield’s steel industry by learning on the job and studying independently. His practical mindset and willingness to experiment would prove to be crucial.

Mural, picture of Harry Brearley by Peter Barr, CC BY-SA 2.0, via Wikimedia Commons

The Birth of Stainless Steel

In 1913, Brearley was tasked with developing a new type of steel for gun barrels that would better resist erosion from heat and friction. While experimenting with different alloys, he added chromium to steel — something others had tried before — but Brearley noticed something unusual. Some discarded test samples refused to rust, even when left exposed to the elements.

Where others might have overlooked this detail, Brearley paid attention. He realised that the chromium formed a thin, invisible protective layer on the steel’s surface, preventing corrosion. This was the breakthrough: a steel resistant to rust and staining. Stainless steel had been born.

At first, the discovery struggled to find acceptance. Traditional steelmakers were sceptical, and early applications were limited. But Brearley soon recognised its potential for everyday use, particularly in cutlery, where hygiene and corrosion resistance were essential.