A351 CF3
Data verifiedASTM A351 CF3 is the cast equivalent of 304L: carbon capped at 0.03% so welded cast assemblies resist sensitization without a post-weld solution anneal. The standard grade for nuclear, food and pharmaceutical castings that will be welded in fabrication or repair.
Chemical composition
| Element | Content (%) |
|---|---|
| C | ≤0.03 |
| Si | ≤2.00 |
| Mn | ≤1.50 |
| P | ≤0.040 |
| S | ≤0.040 |
| Cr | 17.00–21.00 |
| Ni | 8.00–12.00 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Tensile strength | ≥485 MPa |
| Yield strength | ≥205 MPa |
| Elongation | ≥35% |
| Density | 7.90 g/cm³ |
Heat treatment
Solution anneal at ≥1040 °C and water quench (or rapid cool) per ASTM A351.
Equivalent grades
| Standard | Designation |
|---|---|
| din | 1.4309 (GX2CrNi19-11) |
| aisi | A351 CF3 |
| jis | SCS19A |
| gb | ZG00Cr19Ni10 (near) |
Compare side by side: A351 CF3 vs 304L
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Welded process equipment castings, nuclear and high-purity service, food and pharma valves and pumps.
Processing: As CF8, with the low-carbon benefit in the HAZ; weld with 308L-class filler.
FAQ
- When must I specify CF3 instead of CF8?
- When the casting will be welded and cannot be solution-annealed afterwards, or the service is sensitization-critical (e.g. oxidizing acids, nuclear). Otherwise CF8 is cheaper and more widely stocked.
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Ask for a quotationVisit NasteelSource: ASTM A351 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.