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1.ASTM B392 niobium bars high purity

Size Dia.6 ~150MM 

2. melting point: 2468 degree centigrade

3. Boiling point: 4742 degree centigrade

4. density: 8.57 grams per cubic centimeter

5. Material: RO4200-1, RO4210-2 

6. Chemical composition

Chemicial composition             %

Designation

Chief component

Impurities   maximum

 

Nb

Fe

Si

Ni

W

Mo

Ti

Ta

O

C

H

N

Nb1

Remainder

0.004

0.003

0.002

0.004

0.004

0.002

0.07

0.015

0.004

0.0015

0.002

Nb2

Remainder

0.02

0.02

0.005

0.02

0.02

0.005

0.15

0.03

0.01

0.0015

0.01

7. Mechanical requirements (annealed condition)

 Grade

Tensile strength  

δbpsi (MPa), ≥  

Yield strength δ0.2, 

psi (MPa),≥

Elongation in 1"/2"

gage length, %, ≥

RO4200-1

RO4210-2

18000 (125)

12000 (85)

25