Alloy 20 flanges are an iron-base, austenitic alloy with excellent corrosion resistance to a number of different media. On top of these things it proves to be useful in a number of applications such as flue-gas desulfurization, chemical processing, food processing and storage as well as pharmaceutical applications to name a few. Application of alloy 20 equivalent material happens to be really cost effective when carefully compared to higher-cost alloys to determine if the necessary resistance is obtained in the chosen media.
Resistance to sulfuric acid is particularly exceptional but alloy 20 threaded flanges shows useful resistance in phosphoric acid, nitric acid as well as in chloride environments. Alloy 20 material can be formed by either hot-working or cold-work using traditional methods. Hot forged material should be heated in the range of 2100°F and 2250°F with careful temperature control ensuring that the material does not fall below 1800°F prior to forging. After hot working, anneal the material by heating to 1725°F and 1850°F for a minimum of 30 minutes per inch of thickness followed by water quench.
When stress relieving is desired, heat to a temperature below 1000°F followed by water quench after the desired time has been established. Annealing Alloy 20 should be between 1725°F and 1850°F for 30 minutes at temperature per inch of thickness. A lower hardness can be obtained by heating to 2100°F but this may have a negative effect on the stabilization of the alloy.
Welding Alloy 20 is normally performed via TIG, MIG as well as submerged arc welding (SAW) using either the matching filler metal, ER320LR for TIG and MIG and E320LR for SAW. When welding to dissimilar alloys such as 316 or higher alloys such as C276 and Alloy 22, AWS ERNiCrMo-3 can be used for TIG and MIG while using ENiCrMo-3 for SAW.
Be it product manufacturing, maintaining alloy 20 chemical composition, attaining customer satisfaction, alloy 20 mechanical properties or providing on-time delivery we work with the sole motive of attaining the right return on investment.