Open main menu

Wikidata:Property proposal/Pitting resistance equivalent number

pitting resistance equivalent numberEdit

Originally proposed at Wikidata:Property proposal/Natural science

Descriptionpredictive measurement of a stainless steels resistance to localized pitting corrosion
RepresentsPitting Resistance Equivalent Number (Q2044562)
Data typeQuantity
Template parameterThis proprety request is part of the project of creating an infobox for materials.
DomainPhysical and mechanical property of stainless steel (Q172587).
Allowed valuesAny number. Generally between 0 and 50.
Allowed unitsNo unit
Example 1SAE 304 stainless steel (Q3600978) → 19 ± 1.5
Example 2SAE 316L stainless steel (Q28453931) → 28 ± 3
Example 3UNS S32205 / EN 1.4462 Duplex stainless steel (Q7388539) → 34.5 ± 3.5
Example 4SAE 904L stainless steel (Q28454031) → 36 ± 4
Sourcew:Pitting resistance equivalent number
Planned useCreating an infobox for materials


The PREN is the first value to consider when you select a stainless steel for corrosion intensive environnements. To be used on undersea industrial equipments without anodic protection, the stainless steel must have a PREN > 32 (actually often more because of design induced corrosion). This mean that the most used marine stainless steel, the SAE 316L stainless steel (Q28453931) (also known as A4 class of screws) is not suitable for these uses unless it is tied to a big metallic structure providing electrons. Ignoring this rule often lead to catastrophic situations. --Thibdx (talk) 21:46, 28 July 2018 (UTC)


@Thibdx, ديفيد عادل وهبة خليل 2, ArthurPSmith:   Done: pitting resistance equivalent number (P5624). − Pintoch (talk) 08:14, 12 August 2018 (UTC)