. The Iron and steel magazine. ââ^ . â \ II I I i_6 \pu 6 6,9s 9,5 9,53 Diagram 5. Manganese Brasses. Rolled, Drawn and Annealed Blil; ing (i) 45 per cent copper, 10 per cent manganese and 45 percent zinc, and (2) 55 per cent copper and 45 per cent zinc. Theywere found to have respectively the same structure as brasscontaining (i) 45 per cent copper and 55 per cent zinc and (2)55 per cent copper and 45 per cent zinc. Manufacture. â The first samples of manganese brass wereobtained by Stirling and Parker, who reduced some oxide ofmanganese by means of carbon in presence of copper and fol-l
. The Iron and steel magazine. ââ^ . â \ II I I i_6 \pu 6 6,9s 9,5 9,53 Diagram 5. Manganese Brasses. Rolled, Drawn and Annealed Blil; ing (i) 45 per cent copper, 10 per cent manganese and 45 percent zinc, and (2) 55 per cent copper and 45 per cent zinc. Theywere found to have respectively the same structure as brasscontaining (i) 45 per cent copper and 55 per cent zinc and (2)55 per cent copper and 45 per cent zinc. Manufacture. â The first samples of manganese brass wereobtained by Stirling and Parker, who reduced some oxide ofmanganese by means of carbon in presence of copper and fol-lowed by the addition of zinc. In 1876 Parsons, who was thefirst to study these alloys, added to the copper some ferro- 26 The Iron and Steel Magazine manganese and utilized the resulting ferro-cupro-manganese forthe preparation of manganese brass and manganese bronze. At 50 H5 Ho is 3c25Zo15 ,-- h. â *⢠^ _^^^-> \ *⢠/ â â \ N NN X > 0 s -^ 7- Diagram 6. Manganese Brass. First Type, Cast Bars. 0,5 1 2 3 S ?> Diagram 7. Manganese Brass. Second Type, Cast Bars present cupro-manganese, an alloy of copper and manganese,is universally employed. It is added in suitable proportions a Copper Alloys 27 :?hort time before casting. If a large amount of cupro-man-ganese is to be used, most of it should be melted in the crucibleitself, but a little should be kept to be thrown into the cruciblewhen ready to cast. It should be borne in mind that manga-nese may play in the manufacture of brass (as in that of bronze)a double part: (i) it is a deoxidizer which will reduce the oxidespresent in the bath* and(2) it confers, when present in excess,special physical properties as shown below. Mechanical Properties. â The results obtained by the test-ing (i) of cast bars and (2) of bars which were rolled, drawn andreheated, are shown in diagrams 5, 6 and 7. The following results were moreover obtained by Mr. Guille-min, with some manganese bronzes: Description Treatment Soft Mn b
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectiron, bookyear1898
