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Full text of "Metallurgy Of Cast Iron"

276                       METALLURGY   OF   CAST   IRON.
phur .05, manganese .45, phosphorus .29, graphitic carbon 3.01, combined carbon .42, and iron 93.98,. making a total of 99.74. The tensile strength averaged over 30,000 pounds, and the elongation .4 per cent.
4. In making semi-steel, melted in a cupola at the Rarig Engineering Co., near Columbus, O., the following mixture (Table 54), was used:
TABLE   54.
Lawrence piff (No. 2).            ...       ......      ...................	59.3 to 69   per cent
Homogeneous steel (boiler plate scrap) .	39.6 to 30        "
Ferro-manganese, 12 to 15 Ibs. per ton ................................ Alloy in ladle 8 to 10 Ibs. per ton ........................... ...........	.6 to  o.S     " .4 to 0.5     "
	
Total                  ..........................................................	100 per cent.
	
An alloy composed of the following elements Al. 2.00, Mn. 8.71, Si. .22, P. .09, Fe. 89.06, which was in a granulated form, was put into the ladle to flux the metal as described on next page. The analysis of the " semi-steel " castings gave Si. .98, S. 06, Mn. .43, P. .43, G. Car. .96, C. Car. .75. This metal gave an average tensile strength in three castings of 34,700 Ibs. per square inch. The castings are said to have been found free of blow holes and other defects which are sometimes found in semi-steel castings.
In commenting on "semi=steel," so called, Mr. Ulke says that it was used as far back as 1873. It was a^ that time made by Mr. Sleeth of Pittsburg, Pa., and cast into chilled or dry sand rolls and pinions of superior quality. Long before 1873, however, wrought iron or steel scrap had been used in making special grades of cast iron, such as tough cast iron for drop-hammer dies and for similar castings. Certainly the use of steel scrap or of similar material in a cupola, or in a ladle isap     ......	15            x ro           x	1.50 i. So	22.50 iS.oo