The resistance of the alloy to localized tubing corrosion is often estimated from its chemical composition by calculating the alloy's pitting resistance equal number (PREN). The most frequently made use of connection is: PREN = %Cr + three. Wipe an acid-based flux on to the steel surface. The real key http://travisbcabx.loginblogin.com/135508/detailed-notes-on-stainless-teel-tubing