A351 CF8 vs 304
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
A351 CF8
Stainless Steel
ASTM A351 CF8 is the cast equivalent of 304 stainless: the standard material for corrosion-resistant valve bodies, pump casings and process castings. Its composition window is deliberately a little wider than wrought 304 to suit casting practice, with a small controlled ferrite content for castability and weld soundness.
Standards: DIN 1.4308 (GX5CrNi19-10) · AISI A351 CF8 · JIS SCS13A · GB ZG0Cr18Ni9 (legacy, near)
304
Stainless Steel
304 is the most widely used stainless steel in the world, an 18-8 austenitic grade balancing corrosion resistance, formability and weldability. It covers the majority of food, architectural and general industrial applications.
Standards: DIN 1.4301 · AISI 304 · JIS SUS304 · GB 06Cr19Ni10
Chemical composition compared (%)
| Element | A351 CF8 | 304 |
|---|---|---|
| C | ≤0.08 | ≤0.08 |
| Si | ≤2.00 | ≤0.75 |
| Mn | ≤1.50 | ≤2.00 |
| P | ≤0.040 | ≤0.045 |
| S | ≤0.040 | ≤0.030 |
| Cr | 18.00–21.00 | 18.00–20.00 |
| Ni | 8.00–11.00 | 8.00–10.50 |
| Mo | ≤0.50 | — |
| N | — | ≤0.10 |
Properties compared
| Property | A351 CF8 | 304 |
|---|---|---|
| Tensile strength | ≥485 MPa | 515–720 MPa |
| Yield strength | ≥205 MPa | ≥205 MPa |
| Elongation | ≥35% | — |
| Density | 7.90 g/cm³ | 7.90 g/cm³ |
| Delivery condition | — | Annealed |
| Hardness | — | ≤187 HB (annealed) |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: A351 CF8 · 304. Substitution decisions for certified parts stay with the design authority.