. Chemical News and Journal of Industrial Science . in such steels with increaseof carbon from o-io per cent to o*8g per cent is not regular,but is much more rapid in the range 0-3 per cent to cSg being mainly of the diffused variety, take up an inter-mediate position. This indicates that the finer the stateof division of the carbide in the pearlite, the greater is theliability to corrosion when immersed in sea-water—a con-clusion which is in complete accordance with theelectrolytic theory advanced by Cushman (youni. Iron andSteel Inst., igog, i., 33) and Walker (yotirn. Iron andSteel Inst., i
. Chemical News and Journal of Industrial Science . in such steels with increaseof carbon from o-io per cent to o*8g per cent is not regular,but is much more rapid in the range 0-3 per cent to cSg being mainly of the diffused variety, take up an inter-mediate position. This indicates that the finer the stateof division of the carbide in the pearlite, the greater is theliability to corrosion when immersed in sea-water—a con-clusion which is in complete accordance with theelectrolytic theory advanced by Cushman (youni. Iron andSteel Inst., igog, i., 33) and Walker (yotirn. Iron andSteel Inst., igog, i., 6g). This is also supported by thefact that in the case of tempered steels a rise in the tem-pering temperature from 400° C. to 500° C. produces amarked decrease in the corrodibility, this, no doubt, beingdue to the slight decrease in the fineness of division of thepearlite which is produced by the rise in tempering tem-perature. The conversion of the pearlite into hardenite isaccompanied by a very considerable rise in corrodibility,. Carbon per ant. Fjo, 1, 04 0-6 Carbon per cent. per cent carbon than in the low carbon range cio per centto 03 per cent carbon. In the hardened and tempered specimens, however, inwhich the carbide has been converted respectively eitherto hardenite or the emulsified variety of pearlite, it hasbeen found that the corrodibility rises continuously fromo-io per cent to 0*95 per cent carbon, no maximum beingobserved at the saturation-point. The proportional increaseof corrodibility in these steels with rise of carbon per centis very rapid up to about 0-25 per cent carbon in thecase of the hardened steels, and about 0-40 per cent carbonin the tempered specimens. After these points the rate ofincrease of corrodibility with rise of carbon per cent issmall but regular up to 096 per cent carbon, being inthis respect the reverse of that found in the type firstdescribed. The state of division of the carbide in the pearlite isfound to exert very co
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