. Railway mechanical engineer . tisfactory machining qualities of the steel isunusually high. It will also be noted that the tensile strength kzo .0 ■Zzo .0 9/0 Fig. 6. •5 6 ^3S0 poo ReducHor < of Area ^^^^^ ^ %so / —^ pZOO Ji Tensile Sfivngfh iso f ~~~--^ ■5 ^ too E/asHo Limi-f- ■-^^^^^i:::;^^^ ^ \ Ehngai on \ j5 so 60 or iO 3 60 3 40 3 30 J 00 /L Srme/ISOHaiv/ness zoo 400 iOO 800 1000 1200 1400 Drawing and /inneal/nff Temperafures in Degrees Fahrenheit. Effect of Higher Molybdenum Content on Chrome Steel,Oil Quenched Approximate average analysis same as given in Fig. 5. Method of test-ing
. Railway mechanical engineer . tisfactory machining qualities of the steel isunusually high. It will also be noted that the tensile strength kzo .0 ■Zzo .0 9/0 Fig. 6. •5 6 ^3S0 poo ReducHor < of Area ^^^^^ ^ %so / —^ pZOO Ji Tensile Sfivngfh iso f ~~~--^ ■5 ^ too E/asHo Limi-f- ■-^^^^^i:::;^^^ ^ \ Ehngai on \ j5 so 60 or iO 3 60 3 40 3 30 J 00 /L Srme/ISOHaiv/ness zoo 400 iOO 800 1000 1200 1400 Drawing and /inneal/nff Temperafures in Degrees Fahrenheit. Effect of Higher Molybdenum Content on Chrome Steel,Oil Quenched Approximate average analysis same as given in Fig. 5. Method of test-ing same as Fig. 4. and elastic limit decrease slowly as the drawing tempera-ture is increased. This is a distipct advantage, as the highdrawing temperature gives greater resistance to dynamicstresses or fatigue and the slow falling off of the physicalproperties gives a greater permissible range in heat effect of an increase in the molybdenum content isshown by a comparison of the test in Figs. 3 and 4 with. 4W SOO eOO TOO 800 900 1000 1100 izooDrawing and Anneahng Temperafures in Degrees Fahrenheif- Flg. 7. Properties of Nickel Molybdenum Steel. Drawn at Vari-ous Temperatures .Ml tests made with IJs-in. round bars (luenchcd in oil fiom 1,500 Hardening range 1,450 to 1,650 deg. F. Heat treated in full size andthen machined to .505 in. diameter. Approximate average analysis: car-bon .33 per cent, manganese .25 per cent, silicon .18 per cent, nickel cent, molybdenum .58 per cent. Figs. 5 and 6, the curves of the latter charts representingtests of steel containing .76 per cent molyltdenum, whereasFigs. 3 and 4 were plotted for steel with .37 per cent molyb-denum. Molybdenum Spring Steels The type MS has a higher carbon content than the typeMO and is designed especially for springs, rivet sets andforging dies. The analysis range is as follows: Carbon 35 to .60 per cent Manganese 60 to .90 per cent Silicon 10 to .20 per cent Chromium SO to pe
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