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)
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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