Abstract
Under the sponsorship of the Joint Committee, a comparison was made, chiefly at temperatures ranging from 1000 to 1200 F, of the resistance to short-time loading, to prolonged loading (creep) and to repeated stress (fatigue) of 18 per cent Cr, 9.5 per cent Ni, 0.5 per cent Mn, 0.6 per cent Si steels of 0.067 and 0.125 per cent C. Both carbon contents were studied in wrought and cast conditions and no “stabilizing” elements were used. Split induction-furnace heats were poured into ingots for rolling and into castings. Material of known melting history and of identical composition was thus available in both the fine-grained (rolled) and the coarse-grained (cast) states. Both cast and wrought materials were quenched from 2000 F.
The author describes in some detail the tests performed in comparing the characteristics of these steels under varied treatment and reports the results obtained together with certain conclusions which may be drawn.
