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Bureau of Mines / Minerals yearbook: Metals and minerals 1977
Year 1977, Volume 1 (1977)

Kummer, John T.
Molybdenum,   pp. 645-656 PDF (1.4 MB)


Page 656

 1Physical scientist, Division of Ferrous Metals. 
 2Steigerwald, R. F., A. P. Bond, H. J. Dundas, and E. A. Lizlovs. The New
Fe.Cr.Mo Ferritic Stainless Steels. Corro. sion, v. 33, No.8, August 1977,
pp. 279-295. 
 3Lizlovs, E. A. Corrosion Resistance of Types 316 and 317 
Stainless Steels in Simulated SO2 Scrubber Environment. 
J. Electrochem. Soc., v. 124, No. 12, December 1977, pp. 
1887-1888. 
 4Grobner, P. J., and R. F. Steigerwald. Effect of Cold Work on the 88SF
(475) Embrittlement of 18 Cr-2mo Ferritic Stainless Steels. J. Metals, v.
29, No.7, July 1977, pp. 17-23. 
 5Kalns, E. Effects of Surface Hardening Treatments on Wear Resistance of
Mo and TZM Sheet. J. Metals, v. 29, No.4, April 1977, pp. 7.11. 
 6Johnson, A. R. Fracture Toughness of AISI M2 and AISI M7 High.Speed Steels.
Metallurgical Transactions A, v. 8A, June 1977, pp. 891-897. 
 7Burman, R. W. Molybdenum.A Super Superalloy. J. Metals, v. 29, No. 12,
December 1977, pp. 12-17. 
 656 MINERALS YEARBOOK, 1977 
less steels. nally contain 5% and 8.75% molybdenum, The effect of variations
in molybdenum respectively, was found to depend principal- 
content on the corrosion resistance of stain- ly on austenitizing temperature
and hardless steel types AISI 316 and AISI 317 in ness level.6 Lower austenitizing
temperasimulated scrubber environments was tures yielded higher fracture
toughness in investigated.~ These steels, containing 2% the two high-speed
steels. Recent developto 4% molybdenum, are exposed to severe ments in the
production of molybdenumcorrosive attack when utilized in scrubbers base
superalloys and current applications to remove sulfur dioxide from exhaust
gases for TZM alloy were reviewed, especially of powerplants and smelters.
In general, the with regard to performance at high ternstudy found that type
317 steels with at peratures.7 
least 3.4% molybdenum exhibited lower U.S. patents granted during 1977 were
corrosion rates than 316 steels with l~ concerned primarily with new methods
to than 3% molybdenum. The advantage of recover molybdenum from ores, leach
soluthe higher molybdenum contents was tions, and copper smelting slag. Several
shown to exist at temperatures of 80°C and patents were also granted
for procedures to 90°C in solutions of pH2-5.3 and chloride ion upgrade
molybdenum concentrate and contents of 3,000 parts per million (ppm) technical-grade
oxide to high purity oxide and 30,000 ppm. and other molybdenum products.
 Other industrial research efforts reported during the year concerned the
development, properties, and applications of metallurgical materials that
contain molybdenum as an important alloying element. The influence of varying
degrees of cold work on the embrittlement of 18 Cr-2 Mo ferritic stainless
steels was studied.4 Surface hardening treatments of bonding, siliciding,
and nitriding were found to improve the wear resistance of molybdenum metal
and its major alloy, TZM, at temperatures of 260°C and 430°C.~
The
fracture toughness of AISI M2 and M7 high-speed steels, which nomi 


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