TABLE 67. 



MECHANICAL PROPERTIES. 



TABLE 67. Miscellaneous Metals and Alloys. 



(a) TUNGSTEN AND ZINC. 



* Commercial composition for incandescent electric lamp filaments containing thoria (ThCh) approx. 0.75 per cent 

 after Z Jeffries Am. Inst. Min. Eng. Bulletin 138, June, 1918. 



f After Z Jeffries Am. Inst. Min. Eng. Bulletin 149, May, 1919. 



t Ordinary annealing treatment makes W brittle, and severe working, below recrystallization or equiaxing tempera- 

 ture, produces ductility W rods which have been worked and recrystallized are stronger than sintered rods. The 

 equiaxing temperature of worked tungsten, with a s-min. exposure, varies from 2200 C for a work rod with 24 per cent 

 reduction, to 1350 C ior a fine wire with 100 per cent reduction. Tungsten wire, D = 0.635 rnm or 0.025 in. 



Compression on cylinder 25.4 mm (i in.) by 65.1 mm (2.6 in.), at 20 per cent deformation: 



For spelter (cast zinc) free from Cd, av. 17.2 kg/mm 2 or 24,500 lb/in 2 . 



For spelter with Cd 0.26, av. 27.4 kg/mm 2 or 39,000 lb/in 2 . (See Proc. A. S. T. M., Vol. 13, pi. 19.) 



Modulus of rupture averages twice the corresponding tensile strength. 



Shearing strength: rolled, averages 13.6 kg/mm 2 or 194,000 lb/in 2 . 



Modulus of elasticity: cast, 7,750 kg/mm 2 or 11,025,000 lb/in 2 



Modulus of elasticity, rolled, 8450 kg/mm 2 or 12,000 ooo lb/in 2 . (Moore, Bulletin 52, Eng. Exp. Sta. Univ. of 111.) 



(6) WHITE METAL BEARING ALLOYS (BABBITT METAL). 



A. S. T. M. vol. xviii, I, p. 491. 



Experimental permanent deformation values from compression tests on cylinders 31.8 mm (ij in.) diam. by 63.5 mm 

 (2$ in.) long, tested at 21 C (70 F.) (Set readings after removing loads.) 



* U S. Navy Spec. 46M2b (Cu 3 to 4.5, Sn 88 to 89.5, Sb 7.0 to 8.0) covers manufacture of anti-friction-metal castings. 

 > Composition W.) 



NOTE. See also Brass, Lead (yellow brass), Brass, Lead-Tin (Red Brass); Bronze, Phosphor, etc., under Copper 

 alloys 



SMITHSONIAN TABLES. 



