. American engineer . ne the particular chemical compositionof chrome-vanadium steel and the proper heat treatment whichwould give the highest wearing qualities. The success of the 16 AMERICAN ENGINEER. Vol. 87, No. 1. specifications, which are given in full at the end of this article, isillustrated by some tests recently made on tires manufacturedunder them. Three tires, one each manufactured by the MidvaleSteel Company, the Standard Steel Company and the LatrobeWorks of the Railway Steel-Spring Company, were subjectedto physical and chemical tests with the results given in Table compar
. American engineer . ne the particular chemical compositionof chrome-vanadium steel and the proper heat treatment whichwould give the highest wearing qualities. The success of the 16 AMERICAN ENGINEER. Vol. 87, No. 1. specifications, which are given in full at the end of this article, isillustrated by some tests recently made on tires manufacturedunder them. Three tires, one each manufactured by the MidvaleSteel Company, the Standard Steel Company and the LatrobeWorks of the Railway Steel-Spring Company, were subjectedto physical and chemical tests with the results given in Table comparison the properties of carbon steel tires are given inthe last column. Table No. 1.—Comparative Physical Properties and Chemical Composi-tion OF Heat Treated Chrome-Vanadium and StandardCakbon Ste^l Tires. Pliysical Properties. Heat Treated Ch: Elongat: per Carbon, per , per , per , per , per , per , per .. to to Over to Not over Under Not over Under The strength and toughness of heat treated chrome-vanadiumsteel is clearly shown by the drop tests of each of these summary of tlie results secured is given in Table 2. Theaccompanying illustration shows the tire manufactured by theStandard Steel Works Company after being subjected to the droptest. The tire was 48i^ in. internal diameter, 3-5^ in. thick. Adeflection of 4 3-16 in. was required by the specifications, and atotal of 5 5-16 in. was obtained after a total of Z7 blows frotndifferent heights up to 25 ft. In the drop test of the Midvale Steel Company, the tire was555^ in. internal diameter and i%i in. thick. All blows werefrom a height of 40 ft., seven blows in all were given. A totaldeflection of 5 7-16 in. was obtained, AYi in. deflection beingrequired by the specifications. The tire manufactured by theLatrobe Works of the Rail
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
