CF8M Cast Stainless Steel (Cast 316)

ASTM A351 / CF8M. CF8M is the cast equivalent of 316 stainless steel — a molybdenum-bearing austenitic grade with excellent resistance to chloride pitting, used for valve and pump castings in aggressive media.

Chemical composition (nominal wt %)

Element	%
Carbon (C)	≤0.08
Chromium (Cr)	18.0–21.0
Nickel (Ni)	9.0–12.0
Molybdenum (Mo)	2.0–3.0
Silicon (Si)	≤1.5

Mechanical properties

Property	Value
Tensile strength	485 MPa (70 ksi) min
Yield strength	205 MPa (30 ksi) min
Elongation	30% min
PREN	≈ 24–26

Density: 7.75 g/cm³ · Heat treatment: Solution annealed (≈1040–1100 °C, water quench) to dissolve carbides and maximize corrosion resistance.

Cross-standard equivalents

Standard	Equivalent grade
EN	EN 1.4408 (GX5CrNiMo19-11-2)
GB	ZG07Cr19Ni12Mo2
JIS	SCS14
Wrought	≈ AISI 316

Equivalents by nominal class — confirm exact chemistry & spec for critical parts.

Typical applications

Valve bodies & trim for chloride service
Pump casings (seawater/brine)
Chemical & marine components
Food/pharma equipment

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FAQ

What is the difference between CF8 and CF8M?

CF8 is cast 304 (Cr-Ni). CF8M adds 2–3% molybdenum (cast 316), markedly improving chloride pitting and acid resistance — higher PREN (~24–26 vs ~18–20). Use CF8M for seawater and aggressive media.

Is CF8M the same as 316 stainless?

CF8M is the cast equivalent of wrought 316, with controlled ferrite content and comparable corrosion performance — specify CF8M when 316 is required as a casting.