. Official proceedings . No. 7—(See Plate.). No. 13—Distorted Automobile Crank Shaft. perature and time of heating according to chemical composition,size, and physical properties required. Chiome vanadium forgings containing .50 carbon, .75chrome and .20 vanadium, or above, should not be allowed to go 45 cold before annealing. This is what we might term a mild self-hardening steel. The coarse structure produced by the high, andsometimes uneven temperatures, and the strains set up by theoperation of forging, causes the steel to often crack; the rup-ture always occurring at the point of uneven s
. Official proceedings . No. 7—(See Plate.). No. 13—Distorted Automobile Crank Shaft. perature and time of heating according to chemical composition,size, and physical properties required. Chiome vanadium forgings containing .50 carbon, .75chrome and .20 vanadium, or above, should not be allowed to go 45 cold before annealing. This is what we might term a mild self-hardening steel. The coarse structure produced by the high, andsometimes uneven temperatures, and the strains set up by theoperation of forging, causes the steel to often crack; the rup-ture always occurring at the point of uneven strain. In a forg-ing of luiequal size the crack usually shows parallel to the cross-section where the heavy and lighter sections join; in a forgingof equal cross-section they usually run longitudinal. The steelshould be allowed to cool just below color, then heated from800 to 825 degrees centigrade and cooled slowly in the furnace,lime or ashes. This will prevent cracking due to air hardeningfrom the high forgiiig heat. \ Cracks Uiiay Be
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