By Coco
What is CF8M Stainless Steel?
CF8M stainless steel is a cast austenitic stainless steel that is part of the ASTM A351 standard. It is equivalent to 316 stainless steel in wrought form and contains a typical composition of 18% chromium, 8% nickel, and 2-3% molybdenum. The addition of molybdenum enhances its resistance to pitting, crevice corrosion, and overall corrosion in chloride-rich or chemically aggressive environments.
CF8M is commonly used in applications requiring high corrosion resistance, such as pumps, valves, fittings, and chemical processing equipment. Its austenitic structure ensures excellent toughness and ductility, even in cryogenic conditions. The material is also non-magnetic in its annealed state and exhibits good weldability, making it a reliable choice for cast components in challenging environments.
While CF8M offers excellent corrosion resistance and strength, its wear resistance and hardness are lower than some martensitic or duplex stainless steels, limiting its suitability for certain high-wear applications.
Specification Standard for CF8M Stainless Steel
| Specification Standard | Designation | Description |
| ASTM | ASTM A351 | CF8M has excellent corrosion resistance and high temperature strength, good resistance to high temperature redox. It maintains good stability and corrosion resistance in high temperature redox environments. In some valve applications, CF8M is commonly used in corrosive media valves. Its service temperature ranges from – 196°C to 600°C. The corresponding forging of CF8M is 316, and the commonly used standard is ASTM A351 CF8M. |
| GB/T | 0Cr17Ni12Mo2 |
CF8M Stainless Steel Chemical Composition
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni |
| CF8M | ≤0.08% | ≤1.50% | ≤1.50% | ≤0.04% | ≤0.04% | 18.0% – 21.0% | 2.0% – 3.0% | 9.0% – 12.0%
|
CF8M Stainless Steel Corrosion Resistance
CF8M as a cast stainless steel material, the content of various elements in its composition are carefully designed and controlled to meet the requirements of different fields on the material properties. The low content of elements such as carbon, silicon, manganese, phosphorus and sulfur helps to improve the corrosion resistance of the material. Higher content of elements such as nickel, chromium and molybdenum gives the material good corrosion resistance, mechanical properties and high temperature performance. These characteristics make CF8M widely used in food processing, chemical industry, marine engineering and other fields.
Case Study
A seawater desalination equipment manufacturer faced intergranular corrosion during salt spray testing of CF8M stainless steel pump body castings. After analyzing the failed samples, Hengke Metals engineer Zengbao Song identified carbide precipitation caused by improper cooling rate control as the root issue. In response, he led the development of a gradient temperature-controlled casting process, refining the microstructure and restoring corrosion resistance. The upgraded castings passed a 168-hour salt spray test without corrosion and achieved an 8% improvement in mechanical performance.
Throughout the project, he implemented a weekly technical reporting system, delivering detailed performance data and optimized process documentation that helped the client pass certification testing. This case highlights both the corrosion resistance potential of CF8M stainless steel in marine environments and Hengke Metals’ technical strength in casting process control.
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