粒度:-1#:1.41μm 1 #:3.36μm 4 #:5.79μm 松比:-1#:0.75g/cm3 1#:1.32g/cm3 4#:2.33g/cm3 化学成分:-1#:C≤0.8% O≤0.5% N≤1% Fe≥97%