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Steel MakingCutting-off Steel From BarTo cut a piece from an annealed bar, cut off with a hack saw,... Separating The Work From The Compound During the pulling of the heat, the pots are dumped upon a ca... Heat-treating Equipment And Methods For Mass Production The heat-treating department of the Brown-Lipe-Chapin Company... The Forging Of Steel So much depends upon the forging of steel that this operation... Molybdenum Molybdenum steels have been made commercially for twenty-five... Placing The Thermo-couples The following illustrations from the Taylor Instrument Compan... Heavy Forging Practice In heavy forging practice where the metal is being worked at... Pyrometers Armor plate makers sometimes use the copper ball or Siemens' ... Carbon Tool Steel Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham... The Packing Department In Fig. 56 is shown the packing pots where the work is packe... Vanadium Vanadium has a very marked effect upon alloy steels rich in c... Sulphur Sulphur is another impurity and high sulphur is even a greate... Uses Of The Various Tempers Of Carbon Tool Steel DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres... Heat Treatment Of Gear Blanks This section is based on a paper read before the American Gea... Rate Of Cooling At the option of the manufacturer, the above treatment of gea... Flange Shields For Furnaces Such portable flame shields as the one illustrated in Fig. 1... Placing Of Pyrometers When installing a pyrometer, care should be taken that it re... Manganese Manganese adds considerably to the tensile strength of steel,... Correction For Cold-junction Errors The voltage generated by a thermo-couple of an electric pyrom... Tensile Properties Strength of a metal is usually expressed in the number of pou... |
Short Method Of TreatmentCategory: HEAT TREATMENT OF STEEL In the new method, the packed pots are run into the case-hardening furnaces, which are heated to 1,600 deg.F. On the insertion of the cold pots, the temperature naturally falls. The amount of this fall is dependent upon a number of variables, but it averages nearly 500 deg.F. as shown in the pyrometer chart, Fig. 61. The work and furnace must be brought to 1,600 deg.F. Within 2-1/2 hr.; otherwise, a longer time will be necessary to obtain the desired depth of case. On this work, the depth of case required is designated in thousandths, and on crown gears, the depth in 0.028 in. Having brought the work to a temperature of 1,600 deg.F. the depth of case mentioned can be obtained in about 5-1/2 hr. by maintaining this temperature. As stated before, at the top of each pot are several test pieces consisting of a whole scrap gear and several sections. After the pots have been heated at 1,600 deg.F. for about 5-1/4 hr., they are removed, and a scrap-section test-piece is quenched direct from the pot in mineral oil at not more than 100 deg.F. The end of a tooth of this is then ground and etched to ascertain the depth of case. As these test pieces are of exactly the same cross-section as the gears themselves, the carburizing action is similar. When the depth of case has been found from the etched test pieces to be satisfactory, the pots are removed. The iron ball then is dropped into the tube to seal the hole in the bottom of the pot; the cover and the tube are removed, and the gears quenched direct from the pot in mineral oil, which is kept at a temperature not higher than 100 deg.F. Next: The Effect Previous: The Packing Department
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