### Calculating Pitting Resistance - Penflex

Calculating Pitting Resistance Equivalent Number (PREN) Note:To print, please click here.. When a metal hose is considered in an application for transferring an aggressive media, like high chlorides, or when it fails while in service due to pitting corrosion or chloride stress corrosion cracking, it is essential to use a hose or replacement hose manufactured from the proper alloy to prevent Calculation of Pitting Resistance Equivalent Numbers PREN Pitting resistance equivalent numbers (PREN) are a theoretical way of comparing the pitting corrosion resistance of various types of stainless steel, based on their chemical composition. The PREN (or PRE) numbers are useful for ranking and comparing the different grades, but cannot be used to predict whether a particular grade will be suitable for a given application, where pitting corrosion

### PITTING CORROSION OF AISI 316Ti STAINLESS STEEL

It is held to be the steel with the strong pitting corrosion resistance because of its high Pitting Resistance Equivalent Number (PREN = 23.688, calculated from the equation PREN = %Cr + 3.3 ×%Mo +16 ×%N). PREN Pitting Resistance Equivalent Number Paul The pitting resistance equivalent number (PREN) is a theoretical way of comparing the pitting corrosion resistance of various types of stainless steels based on the chemical compositions of an alloy. To improve the pitting corrosion resistance of stainless steel, such alloying elements like molybdenum (Mo) and/or nitrogen (N) are added. PREn - Pitting Resistance Equivalent Number - NeoNickelThe pitting resistance equivalent number (PREn) is a theoretical way of comparing the pitting corrosion resistance of various types of stainless steels based on the chemical compositions of those alloys. The PREn of a given alloy is determined by a mathematical model that

### Pitting Corrosion - NACE

Pitting factor:ratio of the depth of the deepest pit resulting from corrosion divided by the average penetration as calculated from weight loss. * Pitting resistance equivalent number (PREN):an empirical relationship to predict the pitting resistance of austenitic and duplex stainless steels. It is eed as PREN = Cr + 3.3 (Mo + 0.5 W) + 16N. Pitting Resistance - an overview ScienceDirect TopicsA common tool in alloy design is the pitting resistance equivalent number (PREN). It gives an impression of the relative influence of different alloying elements on the pitting resistance. It assumes that other parameters influencing the pitting resistance are kept constant, such as surface condition, heat treatment history, and inclusion levels. Pitting and Crevice Corrosion - Offshore Great Plains May 01, 2016 · The resistance of an alloy to localized tubing corrosion can be estimated from its chemical composition by calculating the alloys pitting resistance equivalent number (PREN). The most frequently used relationship is:PREN = %Cr + 3.3 %Mo + 16 %N.

### Pitting corrosion

Pitting factor:ratio of the depth of the deepest pit resulting from corrosion divided by the average penetration as calculated from weight loss. Pitting resistance equivalent number (PREN):an empirical relationship to predict the pitting resistance of austenitic and duplex stainless steels. It is eed as PREN = Cr + 3.3 (Mo + 0.5 W) + 16N. Stainless Steel Type 316Tiresistance is given by the PRE (Pitting Resistance Equivalent) calculation, where:PRE = Cr + 3.3Mo The PRE of Type 316Ti (23.0) is higher than that of Type 304 (PRE =19.0), reflecting the better pitting resistance which Type 316Ti offers due to its Mo content. Type 304 stainless steel is considered to resist pitting and crevice corrosion in What is A Pitting Resistance Equivalent Number (PREN PREN = %Cr + (3.3 x %Mo) + (16 x %N) PREN = %Cr + 3.3 x (%Mo + 0.5%W) + 16 x %N. The first formula is commonly used for stainless and duplex alloys without tungsten while the second adjusts the model to account for the tungsten present in many super duplex stainless alloys.

### What is a pitting resistance equivalent number? - Langley

As a first review, the Pitting Resistance Equivalent Number (PREN) is a helpful theoretical way of comparing the pitting corrosion resistance of various types of metals based on their chemical compositions. The PREN numbers can be used to compare different grades, but cannot be used to predict absolute performance of a grade in a specific application.PREN Calculation of Pitting Resistance Equivalent NumbersCalculation of Pitting Resistance Equivalent Numbers PREN. Pitting resistance equivalent numbers (PREN) are a theoretical way of comparing the pitting corrosion resistance of various types of stainless steel, based on their chemical composition. The PREN (or PRE) numbers are useful for ranking and comparing the different grades, but cannot be used to predict whether a particular grade will be