Heat Treatment of Steel a Comprehensive Treatise On the Hardening Tempering
Heat Treatment of Steel a Comprehensive Treatise On the Hardening Tempering
Erik Oberg
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16 per cent carbon, 0. 15 per cent silicon, 0. 36 per cent manganese, 0. 018 per cent sulphur, and 0. 013 per cent phosphorus. The whole work of investigation was devoted to questions directly connected with machine shop hardening, with the aim in view of throwing light on the many problems met with in daily practice. Hardening Temperatures. — The hardening point of both low- tungsten and carbon steel may be located with great accuracy, and the complete change from soft to hard is accomplished ...within a range of about 10 degrees F. , or less. After the temperature has been raised more than from 35 to 55 degrees F. Above the hardening point, the hardness of the steel is lessened by further increases in the temperature, provided the heating is sufficiently prolonged for the steel to acquire thoroughly the condition pertaining to the temperature. There is a " change-point " at about 161 5 degrees F. In low- tungsten steel and at a somewhat higher temperature in carbon steel. One of the several indica- tions of this change-point is the shortening of bars hardened in water at temperatures below that point, whereas the bar length- ens if this temperature is exceeded at the time of quenching.
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