奥氏体铁素体和奥氏体铁素体之间的铁素体和铁素体之间的铁素体含量的标准测量方法（BS:49-EN）和奥氏体铁素体和铁素体之间的铁素体含量；手工金属电弧焊条标准焊盘的制备和测量。对于生产焊缝的铁素体测量以及其他工艺（如钨极气体保护焊、气体保护金属极电弧焊和埋弧焊）的焊缝金属，也建议采用通用方法（在这些情况下，应确定焊垫的生产方式）；校准其他仪器以测量FN。交叉引用:ISO 525ISO 15510ISO 4954购买本文件时可获得的所有现行修订均包含在购买本文件中。

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.