December 25, 2018

Stainless Steel CF3M (SS316L)

Stainless steel CF3M is a cast austenitic corrosion resistant alloy material for pressure containing parts, which covered by , and standard. The difference between CF3M and CF8M is carbon content; CF3M has only 0.03% carbon. CF3M generally is named as stainless steel ss316L in ASTM A240 standard.

CF3M (J92800) Chemical Requirements in those two standards as bellow, little difference:

Standard Specification for Castings, Austenitic, for Pressure-Containing Parts:
Carbon: 0.03 max
Manganese: 1.50 max

Pump Suction Cover by investment casting

Pump Suction Cover by investment casting

Silicon: 1.50 max
Sulfur: 0.040 max
Phosphorus: 0.040 max
Chromium: 17.0-21.0
Nickel: 9.0-13.0
Molybdenum: 2.0-3.0
Tensile Strength: min 70ksi(485Mpa)
Yield Strength: min 30ksi (205Mpa)
Elongation in 2in. or 50mm: min 30.0%

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: 1.50 max
Sulfur: 0.040 max
Phosphorus: 0.040 max
Chromium: 17.0-21.0
Nickel: 9.0-13.0
Molybdenum: 2.0-3.0
Tensile Strength: min 70ksi(485Mpa)
Yield Strength: min 30ksi (205Mpa)
Elongation in 2in. or 50mm: min 30.0%

Standard Specification for Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service : The chemistry and mechanical property is same as

CF3M 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.
CF3M Equivalent Stainless Steel Grade:
EN 10088-3 Grade X2CrNiMo17-12-2 (EN10213) EN No. 1.4404;

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CF3M (SS316L) Listed in American Standard:

SS316L (UNS Designation S31603) is generally named for pipe, pipe fittings, flange and forged fittings as bellow standard: WWW.CASTINGQUALITY.COM

ASTM A240 / A240M – 18 Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
ASTM A182/A182M-18a Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
ASTM A312/A312M-18a Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
ASTM A213/A213M-18b Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
ASTM A249/A249M-18 Standard Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
ASTM A276/A276M-17 Standard Specification for Stainless Steel Bars and Shapes
ASTM A403/A403M-18a Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings
ASTM A479 / A479M – 18 Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels

Steel GradeASTM A240
ASTM A403 WP316L(CR316L)
Carbon, max0.0300.0300.030
Manganese, max2.002.002.00
Phosphorus, max0.0450.0450.045
Sulfur, max0.0300.0300.030
Silicon, max0.751.001.00
Nitrogen, max0.10
Tensile, min70ksi (485MPa)70ksi (485MPa)70ksi (485MPa)
Yield, min25ksi (170MPa)25ksi (170MPa)25ksi (170MPa)
Elongation, min40%30%L-28%; T- 20%
Reduction, min50%
Hardness, max217HB (95Rc)

What means of CF3M:

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., CF3M has a maximum of 0.08% carbon)

(M- the Molybdenum contained. If no “M”, means no Molybdenum contained, Such as CF3M, CF8M)

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