Welding. Determination of Ferrite Number (FN) in austenitic and duplex ferritic-austenitic Cr-Ni stainless steel weld metals
焊接 奥氏体和双铁素体奥氏体铬镍不锈钢焊缝金属中铁素体数(FN)的测定
BS EN ISO 8249:2018 specifies the method and apparatus for:the measurement of the delta ferrite content, expressed as Ferrite Number (FN), in largely austenitic and duplex ferritic-austenitic stainless steel1) weld metal through the attractive force between a weld metal sample and a standard permanent magnet;the preparation and measurement of standard pads for manual metal arc covered electrodes. The general method is also recommended for the ferrite measurement of production welds and for weld metal from other processes, such as gas tungsten arc welding, gas shielded metal arc welding and submerged arc welding (in these cases, the way of producing the pad should be defined);the calibration of other instruments to measure FN.Cross References:ISO 525ISO 15510ISO 4954All current amendments available at time of purchase are included with the purchase of this document.