By Callum What is CA40F Stainless Steel ?
CA40F is a kind of martensitic alloy improved by CA40. It is a kind of martensitic stainless steel with low Cr content. It has no rust and corrosion resistance is better than CA40 martensitic stainless steel.
It has good plasticity, toughness and cold formability, and is superior to other martensitic stainless steels with higher Cr content. When the carbon content is controlled very low, the plasticity, toughness and cold formability will be improved significantly.
It is mainly used for manufacturing lining of components and equipment resistant to steam, ammonium bicarbonate mother liquor, hot sulfur-containing petroleum corrosion.
CA40F Chemical Composition
| C | Mn | Si | P | S | Cr | Ni | Mo | |
| Max | 0.40 | 1.00 | 1.50 | 0.04 | 0.40 | 14.0 | 1.0 | 0.50 |
| Min | 0.20 | – | – | – | 0.20 | 11.5 | – | – |
Microstructure：Martensitic stainless steel
Heat treatment
(1) Heat to 1750°F [955°C] minimum, air cool and temper at 1100°F [595°C] minimum, or
(2) Anneal at 1450°F [790°C] minimum
Mechanical Properties
| Grade | ASTM A743 |
| Reduction of Area, min / % | – |
| Yield Strength, min | Ksi – 70, MPa – 485 |
| Tensile Strength, min | Ksi – 100, MPa – 690 |
| Elongation[50mm], min / % | 12 % |
Features
- Good plasticity
- Good toughness
- Good cold formability
- Low carbon content
Applications
- Turbine blade
- Antirust equipment
- Bolt
- Nut
- Corrosion resistant parts