Wikidata:Property proposal/Pitting resistance equivalent number

pitting resistance equivalent number[edit]

Originally proposed at Wikidata:Property proposal/Natural science

Done: pitting resistance equivalent number (P5624) (Talk and documentation)

Description	predictive measurement of a stainless steels resistance to localized pitting corrosion
Represents	Pitting Resistance Equivalent Number (Q2044562)
Data type	Quantity
Template parameter	This proprety request is part of the project of creating an infobox for materials.
Domain	Physical and mechanical property of stainless steel (Q172587).
Allowed values	Any number. Generally between 0 and 50.
Allowed units	No unit
Example 1	SAE 304 stainless steel (Q3600978) → 19 ± 1.5
Example 2	SAE 316L stainless steel (Q28453931) → 28 ± 3
Example 3	UNS S32205 / EN 1.4462 Duplex stainless steel (Q7388539) → 34.5 ± 3.5
Example 4	SAE 904L stainless steel (Q28454031) → 36 ± 4
Source	w:Pitting resistance equivalent number
Planned use	Creating an infobox for materials

Motivation

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)[reply]