UNE-EN ISO 8249:2001 Welding. Determination of Ferrite Number (FN) in austenitic and duplex ferritic-austenitic Cr-Ni stainless steel weld metals. (ISO 8249:2000).
2019UNE-EN ISO 8249:2019 Welding - Determination of Ferrite Number (FN) in austenitic and duplex ferritic-austenitic Cr-Ni stainless steel weld metals (ISO 8249:2018)
2001UNE-EN ISO 8249:2001 Welding. Determination of Ferrite Number (FN) in austenitic and duplex ferritic-austenitic Cr-Ni stainless steel weld metals. (ISO 8249:2000).