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Origem: Wikipédia, a enciclopédia livre.

A gusa é o produto imediato da fundição do minério de ferro com carvão e calcário num alto forno. A gusa normalmente contém até 5% de carbono, o que faz com que seja um material quebradiço e sem grande uso directo.

Geralmente nos processos industriais, o ferro gusa é considerado como uma liga de ferro e carbono, contendo de 4 a 4,5% de carbono e outros elementos ditos residuais como por exemplo: silício, manganês, fósforo e enxofre, dentre outros.

A gusa é vertida diretamente a partir do cadinho para contentores para formar lingotes. Os lingotes são então usados para produzir ferro macio, ferro fundido e aço, ao extrair-se o carbono em excesso.

Os chineses produziam gusa nos finais da Dinastia Zhou. Na Europa, o processo só se tornou comum a partir do século XIV.

O Brasil se destaca como produtor de ferro gusa a partir do carvão vegetal, sendo o maior produtor mundial. Minas Gerais é o Estado com maior numero de produtores, destacando as cidades de Sete Lagoas e Divinópolis como principais polos produtores.

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