August 6, 2013

Stainless Steel CF8 (SS304)

CF8 is a cast Austenitic material for pressure containing parts, which covered by and and standard.

CF8 Chemical Requirements in those two standard is same as bellow:

Standard Specification for Castings, Austenitic, for Pressure-Containing Parts:
ASTM 743 Standard Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application:
Carbon: 0.08 max
Manganese: 1.50 max
Silicon: 2.0 max
Sulfur: 0.040 max
Phosphorus: 0.040 max
Chromium: 18.0-21.0
Nickel: 8.0-11.0
Molybdenum: max 0.50 in , no requirement in A743
Tensile Strength: min 70ksi(485Mpa)
Yield Strength: min 30ksi (205Mpa)
Elongation in 2in. or 50mm: min 35.0%

Cast Stainless Steel Flywheel

Cast Stainless Steel Flywheel


CF8 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.

CF8 equal to SS304/F304 and Chinese Standard GB/T2100 ZG0Cr18Ni9Ti

Manufacture process in Qingdao Casting Quality company: Sand Casting, Precision Investmetn Casting (Lost Wax Casting).

What means of

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 F304 in ASTM A 350 ( F = FORGing)

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

8- the third and fourth digits represent the maximum permitted carbon content in units of 0.01% (e.g., CF8 has a maximum of 0.08% carbon)Casting Material CF8

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  1. Trying to find material equivalents from ASTM A451, given as CPF range and I need reference for 304L. This article is helpful, thank you.

  2. I have cf8 grade material round bar 50mm

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