. Railway mechanical engineer . olatilization inproduction or in use. Heretofore, the properties imparted byfractional percentages of the element were relatively littleunderstood and the alloys of molybdenum formerly used wereoften impure and the results secured were therefore not uni-form. Furthermore, molybdenum was classed as a rare ele-ment, not available in commercial quantities. During the war large deposits of molybdenum were devel-oped at Climax, Colo. From this ore ferro-molybdenum andcalcium mol)bdate were produced in quantities, and a largetonnage of various types of molybdenum stee
. Railway mechanical engineer . olatilization inproduction or in use. Heretofore, the properties imparted byfractional percentages of the element were relatively littleunderstood and the alloys of molybdenum formerly used wereoften impure and the results secured were therefore not uni-form. Furthermore, molybdenum was classed as a rare ele-ment, not available in commercial quantities. During the war large deposits of molybdenum were devel-oped at Climax, Colo. From this ore ferro-molybdenum andcalcium mol)bdate were produced in quantities, and a largetonnage of various types of molybdenum steel was manufac-tured. The molybdenum is introduced into the steel either inthe bath or in the ladle, preferably in the bath, and can beused in steels produced by the open hearth, electric or crucibleprocess. The alloys which have been developed thus far are of fourgeneral types, chrome-molybdenum, chrome-nickel-molybde-num, nickel-molybdenum and chrome-vanadium-molybdcnumsteels. Each of these alloys is made in a number of grades. ,9Fig. 3. ZOO 400 eoO 800 1000 IZOO 1400 Drawing and AnneaUng Temprraftires in Decjrees Frjl renhei-^ Properties of Chrome Molybdenum Steel Quenched InWater and Drawn at Various Temperatures All tests made with 1^4-in. square bars quenched from I,(jOO deg. range 1,500 to 1,700 deg. F. Bars heat treated in full size,then machined to .505 in. diameter. .Xpproxiinate average analysis: car-bon .11 per cent, manganese .55 per cent, silicon .15 per cent, per cent, molybdenum .37 per cent. with varying percentages of the metallic elements and varyingcarbon content. The chemical compositions are as follows: Chrome-Molvbdenum SteelsType \fO Per cent Carbon 15 to .40 Manganese 40 to .80 Chromium 70 to Molybdenum 25 to .40 - Type MS Carbon 40 to .50 Manganese 60 to .90 Silicon 10 to .20 Chromium 80 to Molybdenum , 25 to .40 Chucme-Nickel-Molybdenum SteelType LM Carbon 25 to .35 Manganese 50 to .80 Silicon 10 to .25 Chromium 70 to
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