Transactions . Fig. 21f.—Sample 21 forged and , per cent. Fig. 23a.—Sample 23 , per cent. ;O, per Fig. 23f.—Sample 23 forged and etched. Fig. 21a.—Sample 21 etched. Plate VI.—Samples of Heat I on Bessemer IrojJ. All Sections Magnified 140 Diameters. OVER-OXIDATION OF STEEL. 449 Note the absence of iron phosphide in the high-carbon Test 21a,this being because the phosphorus is low as compared with all theprevious heats. These tests, 21, 22 and 23, all forged well. The high-carbon Test21 was the only one in this high-carbon series which we were able toforg
Transactions . Fig. 21f.—Sample 21 forged and , per cent. Fig. 23a.—Sample 23 , per cent. ;O, per Fig. 23f.—Sample 23 forged and etched. Fig. 21a.—Sample 21 etched. Plate VI.—Samples of Heat I on Bessemer IrojJ. All Sections Magnified 140 Diameters. OVER-OXIDATION OF STEEL. 449 Note the absence of iron phosphide in the high-carbon Test 21a,this being because the phosphorus is low as compared with all theprevious heats. These tests, 21, 22 and 23, all forged well. The high-carbon Test21 was the only one in this high-carbon series which we were able toforge, due to the absence of phosphide of iron out of solution. Mi-crographs 21f, 22f, and 23f show the etched structures of the respec-tive forged test blocks; 23f contains a forged-out blow-hole. For the purpose of verifying our analytical results, we ran checkdeterminations for oxygen on the forged bars. The results are asfollows : Oxygen Content. Test Block No. Test Block No. 10, Test Block No. 21Test Block No. 22. Test Block No. 23. As Cast. As Forged. Per Per \
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