I am assuming that the term "Weissblech" was used which is tinned iron.
Copper / Ciuvre rouge / Roodkoper / Rotkupfer = Pure Copper [Sweden & Hungary for guns. Excellent quality from Japan. Poor quality from Norway and Morocco]
Lead / Plmb / lood / Blei = small amounts were used to improve the machining
Tin / Etain / Tin / Zinn = Makes copper stronger. Too much and the bronze becomes too brittle. Higher levels of tin for mortars. [ORIGIN South East Asia (Indonesia, Malaysia etc..., Cornwall (the best) and Zinnwald in Saxony]
Iron / Fer / Ijzer / Eisen
Cast Iron / Fer fondu / Giertjzer / Gusseisen = used for sea service guns and mortars
Iron Sheet / Tole / Plaatizer / Blech
Tinned iron, white iron / fer blanc / Blik, vertind ijzers / Weissblech = Thin iron sheet coated with a thin layer of tin. This is what was used to make the container for canister or case shot. The literal translation of the French would give white metal or white iron.
Wrought Iron / Fer forge, battu / Smeeddijers / Schmeideeisen