焊接.镍,铬(Cr-Ni)涂料的钢焊条熔敷的奥氏体焊接金属中铁素体含量的测定

[中文适用范围]： 本文件规定了以下方法和装置： ——通过焊缝金属样品和焊缝金属之间的吸引力来测量主要奥氏体和双相铁素体-奥氏体不锈钢中的δ铁素体含量，以铁素体值（FN）表示。 标准永磁体； ——手工金属电弧焊电极标准垫的制备和测量。 还建议对生产焊缝和其他工艺的焊缝金属（如钨极气体保护焊、气体保护金属极电弧焊和埋弧焊）的铁素体测量使用通用方法（在这些情况下，焊盘的生产方式应为定义）； ——测量 FN 的其他仪器的校准。 本文件中规定的方法旨在用于焊接状态的焊缝金属以及热处理后导致铁素体完全或部分转变为任何非磁性相的焊缝金属。 改变铁素体尺寸和形状的奥氏体化热处理改变了铁素体的磁响应。 该方法不适用于测量铸造、锻造或锻造奥氏体或双相铁素体-奥氏体钢样品的铁素体含量。 [外文原描述]： This document 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 steel[1] 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. The method laid down in this document is intended for use on weld metals in the as-welded state and on weld metals after thermal treatments causing complete or partial transformation of ferrite to any non-magnetic phase. Austenitizing thermal treatments which alter the size and shape of the ferrite change the magnetic response of the ferrite. The method is not intended for measurement of the ferrite content of cast, forged or wrought austenitic or duplex ferritic-austenitic steel samples. [1] The term "austenitic-ferritic (duplex) stainless steel" is sometimes applied in place of "duplex ferritic-austenitic stainless steel".