Table 71 

 MECHANICAL PROPERTIES 



Miscellaneous Metals and Alloys 



(a) Tungsten and Zinc 



125 



Metal or 

 alloy 



approx. 

 comp. 



per cent. 



Tungsten, 

 \V9g.2 * 



Zinc, §Zn. 



Condition. 



Ingot sintered, 



D = 5.7 mmoro.22 in. 



Swaged rod, 



D = 0.7 mm or 0.0.5 in. 



Drawn hard, 

 ! D = 0.020 mm or 

 1 0.00114 in 



Swaged and drawn hot 

 97-5% reductionf.. . 



Same as above and 

 equiaxed at 200o°C 

 inH 2 J 



Cast 



Coarse crystalline. . . . 



Fine crystalline 



Rolled (with grain or 



direction of rolling) . 

 Rolled (across grain or 



direction of rolling) . 

 Drawn hard 



Density 

 or weight. 



gm 

 per 

 cm 3 



per 

 ft 3 



a c 

 5 m 



Tension, 



kg/mm 2 



12.7 

 151° 



4IS-0 

 164.0 



Tension, 

 lb/in* 



18,000 

 215,000 



590,000 

 233,500 



SE^- 



ftn'o 



Per cent 



0.0 

 4.0 



(Impurities Pb, Fe and Cd) 



4,000 to 

 12,000 



36,000 

 10,000 



0.0 



28.0 

 65.0 



14.0 



Hardness. 



42 to 

 48 



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

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



t After Z Jeffries Am. Inst. Min. Eng. Bulletin 149, May, 1910. 



j 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 5-min. exposure, varies from 2200° C for a work rod with 24 per cent 

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



§ Compression on cylinder 25.4 mm (1 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 speltei 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 12,000 000 lb/in 2 (Moore, Bulletin 52, Eng. Exp. Sta. Univ. of 111.) 



(b) 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 (Cu3 to 4.5, Sn 88 to 89.5, Sb 7.0 to 8.0) covers manufacture of anti-friction-metal castings. 

 'Composition \V.) 



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

 alloys 



Smithsonian Tables. 



