Relation between physical and magnetic hardness of certain carbon steels . roximately three-quarters of an inch. The two classes of specimens were numbered to corres-pond and v/ere then placed ixi a east iron box containingMagnesium Carbonate, which does not attaclc steel, then theV/hole placed in en annealing furnace. The furnace and theblower are shown in the following blue-print. The temper-atures were :ndicatec! by m^eans of Purnharns Pyrometer,which coneists of a platinarn-iridium couple connected to acalibrated millivoltmeter. Set A of the specimens were tested in the condition inwhich t
Relation between physical and magnetic hardness of certain carbon steels . roximately three-quarters of an inch. The two classes of specimens were numbered to corres-pond and v/ere then placed ixi a east iron box containingMagnesium Carbonate, which does not attaclc steel, then theV/hole placed in en annealing furnace. The furnace and theblower are shown in the following blue-print. The temper-atures were :ndicatec! by m^eans of Purnharns Pyrometer,which coneists of a platinarn-iridium couple connected to acalibrated millivoltmeter. Set A of the specimens were tested in the condition inwhich they were received from the manufacturers. Set B was subjected to a normalizirg heat of about950 degrees C. for about three hours, i. e., a temperaturewhic?i will remove fnaj h:rdness due to the last bars were allowed to cool in the air. Set C was subjected to a heat of about 835 degrees C,which was not kept constant for any particular length oftime but the temperature was slowly decreased until belowthe hardening temperature (about 675 degrees C). The v_,-*^. I^^Hi ? 1 ^^H fC I ^^^Hk it -^ir 1 1 1 sm I .r--:=asrrelationbetweenp00snow
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