CF-8M is a molybdenum bearing modification of of CF8 alloy and is the cast equivalent of wrought AISI 316 stainless steel. The presence of molybdenum increases the general corrosion resistance and the resistance to pitting by chlorides. The alloy is used in mildly acidic and alkaline conditions and for handling citric, oxalic and phosphoric acids.
COMPOSITION
C Mn Si Cr Ni Mo P S
Min % 18 9 2.0
Max % 0.08 1.50 2.0(i) 21 12 3.0 0.04 0.04
Notes (i) Silicon 1.5% Max in ASTM A351
APPLICATIONS
Impellors, propellors, pump casings, valve bodies, press plates.
PRODUCT FORMS
Horizontal and vertical centrifugal castings; static castings.
PHYSICAL PROPERTIES
Density (lbs/in3) 0.280
Liquidus(oF) 2550
Thermal Conductivity 9.4 @ 212oF
(Btu/h/ft2/ft/oF) 12.3 @ 1000oF
Thermal Expansion 8.9 @ 70-212oF
(10-6in/in oF) 9.7 @ 70-1000oF
Magnetic Permeability 1.5-2.5
MECHANICAL PROPERTIES
(Typical Values at Room Temperature - Solution Annealed at 1950-2100oF, Water Quenched.)
ASTM Specs A351, A743 & A744
U.T.S. K.S.I. 80.0 70 Min
Y.S. K.S.I. 42.0 30 Min
Elong. % 50 30 Min
Brinell H B 156-170
Charpy 'Key' ft-lbs 52 @ -400oF
WELDABILITY
CF-8M may be welded by the SMAW, GTAW and GMAW processes.
Electrodes
Preheat None
Post weld heat treatment 1900oF min. water quench
Procedures for welding CF-8M alloy are available from Kubota Metal Corporation.
RELATED SPECIFICATIONS
ASTM A351, A743, A744, , J92900
Nearest wrought grade: AISI 316.
Source: http://www.kubotametal.com
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