碳化鉭

產品牌號

一級

二級

三級

Tac

≥99.5

≥99.0

≥99.0

總碳

≥6.20

≥6.20

≥6.25±0.25

雜質含量不大于

游離碳

≤0.05

≤0.1

≤0.1

Nb

≤0.03

≤0.03

≤0.03

Fe

≤0.05

≤0.1

≤0.1

Si

≤0.008

≤0.01

≤0.015

Al

≤0.005

≤0.005

≤0.01

Ti

≤0.008

≤0.015

≤0.02

N

≤0.001

≤0.005

≤0.01

Na

≤0.003

≤0.005

≤0.02

Ca

≤0.005

≤0.005

≤0.01

K

≤0.003

≤0.005

≤0.01

費氏平均粒徑

0.8～1.0

1.0～1.2

1.2～1.5

1.5～3.0

氧含量/% 不大于

0.35

0.30

0.20

0.15