DESCRIPTION
CF-3M is an Fe-Cr-Ni-Mo alloy that is the cast equivalent of wrought, low carbon, AISI 316L stainless Steel. The low carbon content of the alloy results in greater resistance to sensitization of the welds. Consequently, it is most commonly used in applications were post-weld heat treatment cannot be applied. Optimum corrosion resistance is reached after solution annealing at 1900 to 2050oF followed by rapid cooling. It has good resistance to organic acids and salts, sulphuric and sulphurous acids, phosphoric and phosphoric-sulphuric-hydrofluoric acid mixtures, sulphate and suphite liquors, sea water and other chloride solutions, sodium hydroxide and steam. A modified form of the alloy, known as CF-3MA, has higher strength than the normal CF-3M This is achieved by balancing the composition to produce a higher range of ferrite than the 20% present in the CF-3M grade.
RELATED SPECIFICATIONS
ASTM A351(CF3M and CF3MA), A743(CF-3M), A744(CF-3M), A 451 (CPF3M), J92800 Nearest wrought grade: AISI 316L.
COMPOSITION
C Mn Si Cr Ni Mo P S
Min % 17.0 9.0 2.0
Max % 0.03 1.50 1.50 21.0 13.0 3.0 0.04 0.04
APPLICATIONS
Impellors, propellors, pump casings, suction manifolds and valve bodies.
PRODUCTFORMS
Horizontal and vertical centrifugal castings; static castings.
PHYSICAL PROPERTIES
Density (lbs/in3) 0.280
Liquidus(oF) 2600
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 1.2 to 3.1
MECHANICAL PROPERTIES
(Typical Values at Room Temperature - Solution Annealed >1900oF, Water Quenched.)
ASTM Specs A351 and A743
CF-3M CF-3MA A743 CF-3M A351CF-3A
U.T.S. K.S.I. 80 90 70 Min 77 Min.
Y.S. K.S.I. 38 45 30 Min 35 Min.
Elong. % 55 45 35 Min 35 Min
Brinell H B 150 170
Charpy 'V' ft-lbs 120 100
WELDABILITY
CF-3M may be welded by the SMAW, GTAW and GMAW processes.
Electrodes 308Mo, 316, 317, 316L, 308MoL.
Preheat Not required.
Post weld heat treatment Not normally required
Source: Kubota Metal Corporation
CF-3M is an Fe-Cr-Ni-Mo alloy that is the cast equivalent of wrought, low carbon, AISI 316L stainless Steel. The low carbon content of the alloy results in greater resistance to sensitization of the welds. Consequently, it is most commonly used in applications were post-weld heat treatment cannot be applied. Optimum corrosion resistance is reached after solution annealing at 1900 to 2050oF followed by rapid cooling. It has good resistance to organic acids and salts, sulphuric and sulphurous acids, phosphoric and phosphoric-sulphuric-hydrofluoric acid mixtures, sulphate and suphite liquors, sea water and other chloride solutions, sodium hydroxide and steam. A modified form of the alloy, known as CF-3MA, has higher strength than the normal CF-3M This is achieved by balancing the composition to produce a higher range of ferrite than the 20% present in the CF-3M grade.
RELATED SPECIFICATIONS
ASTM A351(CF3M and CF3MA), A743(CF-3M), A744(CF-3M), A 451 (CPF3M), J92800 Nearest wrought grade: AISI 316L.
COMPOSITION
C Mn Si Cr Ni Mo P S
Min % 17.0 9.0 2.0
Max % 0.03 1.50 1.50 21.0 13.0 3.0 0.04 0.04
APPLICATIONS
Impellors, propellors, pump casings, suction manifolds and valve bodies.
PRODUCTFORMS
Horizontal and vertical centrifugal castings; static castings.
PHYSICAL PROPERTIES
Density (lbs/in3) 0.280
Liquidus(oF) 2600
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 1.2 to 3.1
MECHANICAL PROPERTIES
(Typical Values at Room Temperature - Solution Annealed >1900oF, Water Quenched.)
ASTM Specs A351 and A743
CF-3M CF-3MA A743 CF-3M A351CF-3A
U.T.S. K.S.I. 80 90 70 Min 77 Min.
Y.S. K.S.I. 38 45 30 Min 35 Min.
Elong. % 55 45 35 Min 35 Min
Brinell H B 150 170
Charpy 'V' ft-lbs 120 100
WELDABILITY
CF-3M may be welded by the SMAW, GTAW and GMAW processes.
Electrodes 308Mo, 316, 317, 316L, 308MoL.
Preheat Not required.
Post weld heat treatment Not normally required
Source: Kubota Metal Corporation
