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3. 氧化铁-奥氏体微结构(亦称两相微结构)，其中奥氏体所占容积百分比至少10%(依adtme-1181-87或同类之国家标准)；及
a ferritic-austenitic microstructure (also referred to as a two-phase microstructure ) of which at least 10% is austenite by volume (according to astm e-1181-87 or national equivalents); and
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