This paper, by Candice L. Goucher, examines the history of African metallurgy in the era of Atlantic trade. It reports on excavations at the John Reeder foundry site in St Thomas, Jamaica. The transfer of African technologies to the Caribbean reveals the plantation economy's dependence on African technical expertise, not merely slave labour. The comprehensive focus on the Atlantic world also informs archaeological investigations of African-European interaction in West Central Africa. The complexity of Atlantic technological history is characterized by a diverse range of dynamic interactions, rather than the inevitable decline of African-derived systems. Only by identifying processes as well as products of African technological interaction will it be possible fully to reconstruct the forging of the African past.

In Brazil, the development of steelmaking was attributed to "the technical skills of a few African slaves"(Furtado 1965).

http://www.afrigeneas.com/slavedata/Paper-LSU-1492-1992.html

This paper also discuss the technological transfer of African ironmaking science, but is a little more biased.