NF EN 1043-1,Destructive test on welds in metallic materials - Hardness testing - Part 1: Hardness test on arc welded joints# t4 h! j& n2 z% s f, T
NF A 05-152,Iron and steel products - Macroscopic examination by strong mineral acid attack * n9 l/ S: y: U8 @' C- E$ n9 yNF A 05-150,Steel products - Micrographic examination techniques , ]4 c# `8 t/ R, z% b J: R. ?NF A 05-165,Steel products - Manual point counting method for statistically estimating the volume fraction of a constituent with a point grid5 }9 j. }! n4 }# L" C