CF8 / CF8M Stainless Steel investment castings for industrial applications.
CF8 (equivalent to 304) and CF8M (equivalent to 316) are the most commonly specified austenitic stainless steel casting grades. CF8M contains 2-3% molybdenum, which provides superior resistance to pitting and crevice corrosion in chloride environments.
Chemical composition and classification of available grades:
| Grade | ASTM | UNS | Cr % | Ni % | Mo % |
|---|---|---|---|---|---|
| CF8 | A351 | J92600 | 18-21 | 8-11 | - |
| CF8M | A351 | J92900 | 18-21 | 9-12 | 2-3 |
| CF3 | A351 | J92500 | 17-21 | 8-12 | - |
| CF3M | A351 | J92800 | 17-21 | 9-13 | 2-3 |
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CF8 is a cast austenitic stainless steel defined under ASTM A351, most easily understood as the cast equivalent of wrought 304. Where a component is produced by casting rather than rolling or forging, CF8 is typically specified where 304 would be used in wrought form. Chemistry centers on ~18–20% chromium and ~8–11% nickel (indicative; verify against ASTM A351), giving good general corrosion resistance, weldability and toughness.
CF8M is the molybdenum-bearing version (~2–3% Mo, indicative), improving pitting/crevice corrosion resistance in chloride or mildly acidic service — making it the cast counterpart to wrought 316. Wrought and cast grades follow different standards, so equivalences are indicative and should be confirmed against the standard and the foundry's certified material test report.
| Cast grade (ASTM A351) | Wrought equivalent | Distinguishing element | Typical use |
|---|---|---|---|
| CF8 | ~304 | Cr-Ni austenitic | General corrosion-resistant castings, valve/pump bodies |
| CF8M | ~316 | +~2–3% Mo | Chloride/acidic service, marine/chemical components |
Is CF8 the same as 316? No — CF8 corresponds to 304; the cast grade matching 316 is CF8M (with molybdenum). What is CF8 equivalent to? Broadly wrought 304. CF8 forged equivalent? CF8 is a casting grade with no direct forged form; the closest wrought analogue is 304. (Indicative; verify against ASTM A351.)