316L Stainless Steel Valves

CF8, CF8M, CF3, and CF3M are all austenitic cast stainless steels under the ASTM A351 standard, commonly used for valves, pump bodies, flanges, and other castings. These materials correspond in composition to the wrought stainless steels 304/304L/316/316L, with the key differences being the carbon content and whether molybdenum (Mo) is included. GEKO Brand Valves are made from premium materials like these, offering superior performance in demanding environments such as industrial and chemical applications.     1）. Quick Code Meaning C: Casting F: Austenitic 8: Carbon ≤ 0.08% (standard carbon) 3: Carbon ≤ 0.03% (ultra-low carbon) M: Contains Mo (Molybdenum, 2.0%–3.0%)   2). Material Correspondence and Composition (ASTM A351)   American Standard Code Corresponding Steel Chinese Standard Code (Casting) Carbon Content Limit Main Composition (%) Core Characteristics CF8 304 ZG08Cr18Ni9 ≤0.08 Cr:18-21 Ni:8-11 General corrosion-resistant, lead-free CF8M 316 ZG08Cr18Ni1 2Mo2 ≤0.08 Cr:18-21 Ni:9-12 Mo:2-3 Contains molybdenum, resistant to chlorides CF3 304L ZG03Cr18Ni1 0 ≤0.03 Cr:17-21 Ni:8-12 Ultra-low carbon, resistant to intergranular corrosion CF3M 316L ZG03Cr18Ni1 2Mo2 ≤0.03 Cr:17-21 Ni:9-13 Mo:2-3 Ultra-low carbon + molybdenum, welded / seawater / chemical engineering preferred   3). Key Differences and Selection Points for GEKO Valves   CF8 vs CF3   CF8: Carbon ≤ 0.08%, corresponding to 304, suitable for general corrosion, non-welded, or weldable castings that can undergo solution treatment. GEKO Brand Valves manufactured with CF8 material are ideal for standard industrial applications and environments with mild corrosion conditions. CF3: Carbon ≤ 0.03%, corresponding to 304L, more resistant to intergranular corrosion, suitable for thick-walled welded parts, and situations where post-weld heat treatment is not required. GEKO valves utilizing CF3 material offer superior resistance in welding applications and critical environments.   CF8M vs CF3M   CF8M: Carbon ≤ 0.08% + Mo, corresponding to 316, resistant to moderate corrosion and chloride ions. GEKO Brand Valves made from CF8M are specifically designed for use in environments exposed to chloride ions and moderate corrosion, ensuring longevity and reliability in both industrial and chemical processing sectors.   CF3M: Carbon ≤ 0.03% + Mo, corresponding to 316L, suitable for welding, resistant to intergranular corrosion and pitting, and ideal for harsh environments such as seawater, chemicals, LNG, etc. GEKO valves made from CF3M are perfect for the toughest environments, such as marine, chemical, and LNG industries, providing excellent resistance to corrosion and ensuring extended service life.       4).Typical Applications     CF8: General water, nitric acid, food, low-temperature conditions. GEKO valves made from CF8 material are commonly used in water treatment systems and food processing applications where moderate corrosion resistance is required.   CF8M: Acetic acid, phosphoric acid, moderate chloride ion environments. GEKO Brand Valves made with CF8M are perfect for chemical industries handling acids and moderate levels of chloride ions.   CF3: Welding structures, large sections, and situations where post-weld heat treatment is not required. GEKO valves made from CF3 material are ideal for welding applications requiring strength and durability.   CF3M: Seawater, saltwater, chlorine-containing acidic media, marine engineering, desulfurization equipment. GEKO valves made with CF3M material are the first choice for applications in seawater, saltwater, and other corrosive environments.   Contact us for more!