1、YS/T 259-2012表1（续）质量分数/%牌号FTa-1FTa-2FTa-3FTa-4FTaNb-3FTaNb-20Si0.0030.0050.010.030.020.02Nb0.0030.0050.0050.03W0.0020.0030.0030.010.010.01Mo0.0010.0020.0020.010.010.01Ti0.0010.0010.0010.010.010.01杂质含量，Mn0.0010.0010.0010.001不大于Sn0.0010.0010.0010.001Ca0.0010.0010.0010.001AI0.0010.0010.0010.001Cu0.0010
2、.0010.0010.001Mg0.0010.0050.010.01P0.00150.003注：钽含量用减量法计算。3.3物理性能产品的松装密度、费氏平均粒径和筛分粒度应符合表2的规定。表2牌一号松装密度(g/cm3)费氏平均粒径/m筛分粒度/mFTa-1提供实测值2.010.0FTa-23.05.03.010.0154m筛下物的数量95%FTa-32.35.02.58.5FTa-42.35.02.58.5315m筛下物的数量95%FTaNb-3100m筛下物的数量95%FTaNb-203.4外观质量产品外观应呈深灰色或黑色，无目视可见的夹杂物。4试验方法4.1产品的化学成分分析按GB/T15076的规定进行。4.2产品的松装密度测定按GB/T1479的规定进行。4.3产品的费氏平均粒径测定按GB/T3249的规定进行。4.4产品的筛分粒度测定按GB/T1480的规定进行。2
