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CF8M stainless steel casting is the most popular of the A351 grades because it offers good strength, excellent corrosion resistance, and high-temperature resistance. This material makes it suitable for various industrial applications.
CF8M material is a type of austenitic stainless steel. It is often referred to as 316 equivalent or 316 stainless. This is because it shares some properties with the latter. This casting grade feature is 18% nickel, 8% molybdenum, and 14% chromium. The chemical composition provides excellent corrosion resistance to chloride environments.
Some of the most common places where this material is used include chemical processing, marine environments, and food processing equipment. In addition, it is also used for valves, pumps, and piping systems where resistance to pitting and crevice corrosion is necessary.
The next most common CF8M material casting grade is CF3M. It is a variation of CF8M. The only difference is that while CF8M has 8% nickel, CF3M has 3% nickel. Furthermore, CF3M also contains lower carbon levels than CF8M. Thus making it more ideal for applications requiring resistance to intergranular corrosion.
CF3M material is often used in more aggressive environments. Such areas include chemical processing plants with exposed to sulfuric acid or sensitive heat treatment operations.
The CF8C casting grade is also austenitic stainless steel. Just like CF8M and CF3M, it has excellent resistance to corrosion. It also has superior properties to withstand high temperatures. What makes CF8C different from the other two grades is that it has 5% copper added to the chemical composition.
CF8C copper addition improves the material's resistance to corrosion in acidic environments. For this reason, the CF8C is often used in the petroleum and power generation industries. In these industries, they are exposed to corrosive environments.
The CF 8M casting grade is also austenitic stainless steel. It is identical to CF8C. The only difference is that while CF8C has 5% copper, CF8M has no copper content. As such, this casting is used in sulfuric and other acidic environments' CF8C corrosion resistance.
CF8M also has excellent resistance to pitting and crevice corrosion, making it ideal for marine applications.
As mentioned above, ASTM A351 standard pertains to the properties of cast austenitic stainless steel. These inconsistencies are meant to ensure that the castings used in critical applications meet the necessary performance criteria. Also worth mentioning is that durability varies between casting grades.
For example, the 316 equivalent has excellent corrosion resistance due to the molybdenum addition in its chemical composition. Molybdenum improves the alloy’s resistance to pitting and crevice corrosion. Therefore, CF8M grade found in marine applications enjoys long-term durability.
The CF3M grade has low carbon content and is perfect for high-temperature applications. It also minimizes the risk of intergranular corrosion. In addition, the CF3M materials can maintain their strength and corrosion resistance even after extended exposure to elevated temperatures.
The addition of copper in the CF8C and CF8M materials enhances their durability in acidic environments exposed to chemical processing and heat exchangers. Also, copper acts by minimizing corrosion rate. This prolongs the life of equipment and components.
In summary, ASTM A351 CF8C, CF3M, and CF8M grades offer varying degrees of durability depending on the specific environmental conditions they encounter. In other words, buyers should consider the application requirements when choosing the right casting material. Doing this will ensure they get the best long-lasting performance suited to their intended use.
To make it easier for buyers, here is a list of the durability features of each grade:
Buyers should be aware that ASTM A351 standard governs various applications this cast, suite of austenitic stainless steel. Also covers various parts and supplies where CF8M, CF3M, CF8C, and other variations are commonly used.
For starters, the CF8M is widely used in pumps and valves for chemical and industrial processing. Its resistance to corrosion makes it ideal for transporting aggressive fluids. On the other hand, CF3M is used in food processing and pharmaceutical equipment. The lower carbon content makes it suitable for environments where intergranular corrosion may be a concern.
Moreover, CF8C materials with copper addition are commonly found in heat exchangers and condenser components. These are areas exposed to acidic environments. Lastly, CF8M has found wide use in marine equipment due to resistance to saltwater.
The common component manufactured using these castings includes valve bodies, which control fluid flow in piping systems. Other commonplace uses include pump casings, which are vital in transferring liquids in various industries. Chemical processing, marine environments, and food and beverage industry widely used these castings.
Other parts that use these alloys include:
When choosing the right C354M standard for the required application, there are several factors buyers should consider. The first factor is the chemical composition of the casting. Different grades have varying alloying elements that determine their resistance to corrosion.
An example is CF8M, which consists of 316 stainless steel. This makes it ideal for marine environments because of its excellent resistance to corrosion, heat, and pitting. Buyers should consider the operating temperature of casting. If the application is at high temperatures, it is better to choose CF3M casting. It has low carbon content to minimize intergranular corrosion.
On the other hand, copper-enriched CF8C is preferred for equipment used in acid environments because of its excellent resistance. So, buyers should choose casting that meets the required mechanical properties. These properties include tensile strength, yield strength, and elongation percentage. In cases where corrosion resistance is not enough, buyers should check if the casting has mechanical strength properties that meet the application requirements.
The last consideration when choosing stainless steel castings is the cost. Most of the time, castings with more alloying elements like molybdenum or copper are more expensive. So, weigh the costs depending on the project requirements. By considering these factors, buyers will select the right grade casting suitable for their customer’s needs.
Molybdenum improves CF8M alloy's resistance to pitting, crevice corrosion, and oxidation. It also enhances strength at elevated temperatures.
Low-carbon CF3M castings are typically used for parts in food and pharmaceutical processing equipment exposed to high temperatures.
The chemical processing, marine, and food and beverage industries widely use CF8M castings for equipment and components.
Copper improves CF8C castings resistance to acidic environments. It also enhances durability and corrosion resistance.
