Carlson Alloy C20 or simply as Alloy 20 is one of the most popular stainless steel materials usually used in sulfuric acid-related applications. It is an iron-based nickel chromium molybdenum stainless steel alloy known for its high resistance to corrosion making it very suitable for various purposes especially in commercial and industrial purposes. Alloy 20cb3 is usually used in plastic industries, pharmaceutical industries, chemical industries, synthetic fibers and even in the food industries. Alloy 20 contains copper making it resistant to corrosion due to sulfuric acid. It is also resistant to pitting which usually happens to metal surfaces exposed to ions and moisture.
Alloy 20 or Carpenter 20 CB 3 is a nickel alloy stainless steel or ASTM. It is of composed of 32.5 to 35% Nickel, 31 to 44% Iron, 19 to 21% Chromium, 3 to 4% Copper, and small percentage of Molybdenum, Manganese, Columbium, Silicon and Carbon. Because of its high nickel composition mixed with copper, molybdenum and chromium, Alloy 20 is one of the most corrosive-resistant materials especially to sulfuric acid corrosion. With the columbium content, this stainless steel is also useable in as-welded conditions since columbium has heat-stabilizing properties. It has a very good physical and mechanical properties and Carpenter 20 CB3 can also be easily fabricated making it suitable for industrial, commercial and manufacturing purposes.
The physical properties of Alloy 20 are 8083 km/m3 density, specific heat of 32-212¡ãF and Electrical Resistivity of 68¡ãF or 651 microhm-cm. Its Magnetic Permeability is 1.002 while the Modulus of Elasticity Tension is 28. It has a Poisson¡¯s Ratio of 0.31. When it comes to mechanical properties, Alloy 20 has 35% elongation in 2 inches or 50.8 mm. It has an Ultimate Tensile Strength of 683 MPa or 99,000 psi, yield strength of 414 MPa or 60,000 psi and hardness of 148 HV.