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Steel MakingBrown Automatic Signaling PyrometerIn large heat-treating plants it has been customary to mainta... The Effect The heating at 1,600 deg.F. gives the first heat treatment w... Composition And Properties Of Steel It is a remarkable fact that one can look through a dozen tex... Making Steel Balls Steel balls are made from rods or coils according to size, st... Lathe And Planer Tools FORGING.--Gently warm the steel to remove any chill, is parti... Preventing Cracks In Hardening The blacksmith in the small shop, where equipment is usually ... Temperature Recording And Regulation Each furnace is equipped with pyrometers, but the reading an... Cyanide Bath For Tool Steels All high-carbon tool steels are heated in a cyanide bath. Wi... Phosphorus Phosphorus is one of the impurities in steel, and it has been... Open Hearth Process The open hearth furnace consists of a big brick room with a l... Cutting-off Steel From Bar To cut a piece from an annealed bar, cut off with a hack saw,... Blending The Compound Essentially, this consists of the sturdy, power-driven separa... Process Of Carburizing Carburizing imparts a shell of high-carbon content to a low-... Annealing Of High-speed Steel For annealing high-speed steel, some makers recommend using g... Separating The Work From The Compound During the pulling of the heat, the pots are dumped upon a ca... Plant For Forging Rifle Barrels The forging of rifle barrels in large quantities and heat-tre... Molybdenum Molybdenum steels have been made commercially for twenty-five... Heating Of Manganese Steel Another form of heat-treating furnace is that which is used ... Steel Worked In Austenitic State As a general rule steel should be worked when it is in the a... Uses Of The Various Tempers Of Carbon Tool Steel DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres... |
MolybdenumCategory: ALLOYS AND THEIR EFFECT UPON STEEL Molybdenum steels have been made commercially for twenty-five years, but they have not been widely exploited until since the war. Very large resources of molybdenum have been developed in America, and the mining companies who are equipped to produce the metal are very active in advertising the advantages of molybdenum steels. It was early found that 1 part molybdenum was the equivalent of from 2 to 2-1/2 parts of tungsten in tool steels, and magnet steels. It fell into disrepute as an alloy for high-speed tool steel, however, because it was found that the molybdenum was driven out of the surface of the tool during forging and heat treating. Within the last few years it has been found that the presence of less than 1 per cent of molybdenum greatly enhances certain properties of heat-treated carbon and alloy steels used for automobiles and high-grade machinery. In general, molybdenum when added to an alloy steel, increases the figure for reduction of area, which is considered a good measure of toughness. Molybdenum steels are also relatively insensible to variations in heat treatment; that is to say, a chromium-nickel-molybdenum steel after quenching in oil from 1,450 deg.F. may be drawn at any temperature between 900 and 1,100 deg.F. with substantially the same result (static tensile properties and hardness). Next: Silicon Previous: Tungsten
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