| A gentleman of high respectability in the navy relates the following story. "When on a voyage to New York, we had not been four days at sea, before an occurrence of a very singular nature broke in upon our quiet. It was a ghost! One nig... Read more of The Ghost On Ship-board at Scary Stories.ca |  InformationalPrivacy |
Steel MakingHeat Treatment Of Lathe Planer And Similar ToolsFIRE.--For these tools a good fire is one made of hard foundr... Tensile Properties Strength of a metal is usually expressed in the number of pou... Heat Treatment Of Axles Parts of this general type should be heat-treated to show the... Mushet And Bessemer That Mushet was "used" by Ebbw Vale against Bessemer is, perh... Carbon In Tool Steel Carbon tool steel, or tool steel as it is commonly called, us... Heat-treating Equipment And Methods For Mass Production The heat-treating department of the Brown-Lipe-Chapin Company... Highly Stressed Parts The highly stressed parts on the Liberty engine consisted of ... The Care Of Carburizing Compounds Of all the opportunities for practicing economy in the heat-t... Cutting-off Steel From Bar To cut a piece from an annealed bar, cut off with a hack saw,... Hardening Steel is hardened by quenching from above the upper critical.... Using Illuminating Gas The choice of a carburizing furnace depends greatly on the fa... Lathe And Planer Tools FORGING.--Gently warm the steel to remove any chill, is parti... Forging High-speed Steel Heat very slowly and carefully to from 1,800 to 2,000 deg.F.... Open Hearth Process The open hearth furnace consists of a big brick room with a l... Annealing In Bone Steel and cast iron may both be annealed in granulated bone. ... The Packing Department In Fig. 56 is shown the packing pots where the work is packe... Quenching The Work In some operations case-hardened work is quenched from the bo... Silicon Silicon prevents, to a large extent, defects such as gas bubb... Care In Annealing Not only will benefits in machining be found by careful anne... The Penetration Of Carbon Carburized mild steel is used to a great extent in the manufa... |
Process Of CarburizingCategory: HEAT TREATMENT OF STEEL Carburizing imparts a shell of high-carbon content to a low-carbon steel. This produces what might be termed a dual steel, allowing for an outer shell which when hardened would withstand wear, and a soft ductile core to produce ductility and withstand shock. The operation is carried out by packing the work to be carburized in boxes with a material rich in carbon and maintaining the box so charged at a temperature in excess of the highest critical point for a length of time to produce the desired depth of carburized zone. Generally maintaining the temperature at 1,650 to 1,700 deg. F. for 7 hr. will produce a carburized zone 1/32 in. deep. Heating to a temperature slightly above the highest critical point and cooling suddenly in some quenching medium, such as water or oil hardens the steel. This treatment produces a maximum refinement with the maximum strength. Drawing to a temperature below the highest critical point (the temperature being governed by the results required) relieves the hardening strains set up by quenching, as well as the reducing of the hardness and brittleness of hardened steel. Next: Effects Of Proper Annealing Previous: Annealing Work
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