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Definition: The Bessemer Steel Process was a process of producing high-quality steel by shooting air into molten steel to burn off carbon and other impurities. It was named for the British inventor Sir Henry Bessemer, who worked to develop the process in the 1850s.
New steel: The Bessemer converter. The earliest evidence of steel production is from sub-Saharan Africa in the first millennium BC. The Haya people, from an area now in north western Tanzania, developed a technology for producing high-grade carbon steel that was in use until the 1950s.