The beginnings of cheap steel

The essay recounts the mid-19th-century transformation of steelmaking from slow cementation and crucible methods to an air-blast converter that decarburizes molten pig iron by blowing cold air and then restores controlled carbon with manganiferous additions. It reconstructs contemporary technical debates about priority and practical contributions, weighing claims by inventors who asserted antecedent air-boiling methods and by metallurgists who developed manganese treatment, and situates the controversy in press discussion and patent disputes. The author re-evaluates chronologies and credit, arguing that while one inventor profited commercially, several figures played distinct roles in making the process practical and widely adopted.