Firmetal Co., Ltd.

Products - Niobium

ASTM B391, B392, B393, B394: Chemical Requirements for Nb and Alloy Nb1Zr

ASTM B391, B392, B393, B394: Chemical Requirements for Nb and Nb Alloy Nb1Zr (Maximum Weight %)
Element	Type 1 Reactor Grade Unalloyed Niobium R04200	Type 2 Commercial Grade Unalloyed Niobium R04210	Type 3 Reactor Grade Nb 1% Zirconium R04251	Type 4 Commercial Grade Nb 1% Zirconium R04261
Each Ingot
Carbon	0.01	0.01	0.01	0.01
Nitrogen	0.01	0.01	0.01	0.01
Oxygen	0.015	0.025	0.015	0.025
Hydrogen	0.0015	0.0015	0.0015	0.0015
Zirconium	0.02	0.02	0.8 to 1.2	0.8 to 1.2
Tantalum	0.01	0.2	0.1	0.5
Iron	0.005	0.01	0.005	0.01
Silicon	0.005	0.005	0.005	0.005
Tungsten	0.03	0.05	0.03	0.05
Nickel	0.005	0.005	0.005	0.005
Molybdenum	0.010	0.10	0.10	0.050
Hafnium	0.02	0.02	0.02	0.02
When Specified
Boron	0.0002	-	0.0002	-
Aluminum	0.002	0.005	0.002	0.005
Beryllium	0.005	-	0.005	-
Chromium	0.002	-	0.002	-
Cobalt	0.002	-	0.002	-