Casting Material: Stainless Steel CF3
CF3 is a cast austenitic corrosion resistant alloy material for pressure containing parts, which covered by ASTM A351, ASTM A743 and ASTM A744 standard. The difference between CF3 and CF8 is carbon content; CF3 has only 0.03% carbon. CF3M has molybdenum but CF3 don’t contain it. www.castingquality.com
Manufactured by sand casting or investment casting ( lost wax precision casting) process.
UNS: J92500; Wrought UNS S30403, grade 304L.
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CF3 (SS304L) Listed in American Standard:
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- Sand Casting
Casting Quality focus on Metal Parts industry, we provide professional service in Metal Casting field.
Sand Casting is a popular metal form method, are suitable for all materiel, such as grey iron, ductile iron, malleable iron, carbon steel, stainless steel, aluminum and bronze.
- Investment Casting
also named as precision lost wax casting, mainly suitalbe for carbon steel and stainless steel parts. We also provide grey iron and ductile iron and aluminum and bronze parts by investment casting. It can achieve the best appearance with good tolerance
- Shell Casting
Shell casting method is a good option to replace investment casting and sand casting. the quality is better than sand casting parts, suitable for bulk production.
- CNC Machining
CNC Milling, CNC turning with 5 xix CNC center, we provide precision machining for all castings based on customers design drawings.
- CAD Design
Mechanical Design service based on customers requirement, our software is Solidworks and AutoCAD.
- Tools/Mold Design
Mould design and production will be served for metal casting ad plastic injection industry. Based on our more than 10 years experience, we supply professional molds for our customers in Europe and North American.
CF3 Chemical Requirements in those two standards as bellow, little difference:
ASTM A351 Standard Specification for Castings, Austenitic, for Pressure-Containing Parts: www.castingquality.com
Carbon: 0.03 max
Manganese: 1.50 max
Silicon: 1.50 max
Sulfur: 0.040 max www.castingquality.com
Phosphorus: 0.040 max
Chromium: 17.0-21.0
Nickel: 8.0-12.0
Tensile Strength: min 70ksi(485Mpa)
Yield Strength: min 30ksi (205Mpa)
Elongation in 2in. or 50mm: min 35.0%
Impeller Investment Casting
ASTM 743A Standard Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application:
Carbon: 0.03 max
Manganese: 1.50 max
Silicon:2.00 max
Sulfur: 0.040 max
Phosphorus: 0.040 max
Chromium: 17.0-21.0
Nickel:8.0-12.0
Tensile Strength: min 70ksi(485Mpa)
Yield Strength: min 30ksi (205Mpa)
Elongation in 2in. or 50mm: min 35.0%
ASTM A744 Standard Specification for Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service : The chemistry and mechanical property is same as A743
CF3 Heat treatment process: Heat to 1900°F [1040°C] minimum, hold for sufficient time to heat casting to temperature, quench in water or rapid cool by other means. As caste if corrosion resistance is acceptable too.
Similar Material: EN No. 1.4306; DIN 1.4306; X2CrNi19-11; Chinese grade ZG00Cr18Ni10; JIS G5121 SCS19A, BS970 1504 304C12E
Wrought grade: DIN X2CrnI18 9 ( W-Nr 1.4306); 304l
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CF-3 is an Fe-Cr-Ni alloy that is the cast equivalent of wrought, low carbon, AISI 304L /F304L 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-sulphurichydrofluoric 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-3A, has higher strength than the normal CF-3 This is achieved by balancing the composition to produce a higher range of ferrite than the 20% present in the CF-3 grade.
CF3A, indicated in ASTM A351 only, it’s same as CF3, just the tensile is different: tensile 77ksi(530Mpa) and yield strength of 35Ksi(240Mpa). CF3A is not rerecommended for service at temperatures above 800F(425C) because of thermal instability.
APPLICATIONS www.castingquality.com
Impellors, propellers, pump casings, suction manifolds and valve bodies.
WELDABILITY www.castingquality.com
CF-3 may be welded by the SMAW, GTAW and GMAW processes.
Metal Castings
What means of CF3: www.castingquality.com
As to the designation –
C (first letter) means the service it is intended to be used in this case – corrosion resistant service , but casting quality think sometimes it means of CASTING USAGE because you will find F316 in ASTM A 350 ( F = FORGE)
F(second letter) -The second letter indicates the approximate location of the alloy on the iron-chromium-nickel (FeCrNi) ternary diagram. For users familiar with the diagram, the second letter does provide an indication of the nominal iron, nickel, and chromium content, but most people would have to obtain alloying information from a material specification.
3 – the third and fourth digits represent the maximum permitted carbon content in units of 0.01% (e.g., CF8M has a maximum of 0.08% carbon)
(M- the Molybdenum contained. If no “M”, means no Molybdenum contained, Such as CF3M, CF8M)
Casting Material CF3