Another improvement in steelmaking was the Siemens-Martin process , which complemented the Bessemer process .
The first industrial process for making cheap steel was Bessemer process , followed by Siemens-Martin open-hearth process .
The first industrial process for making cheap steel was Bessemer process , followed by Siemens-Martin open-hearth process .
Simplificar este párrafo: Another improvement in steelmaking was the Siemens-Martin process , which complemented the Bessemer process . Producción: