Firmetal Co., Ltd.

Products - Tantalum

ASTM Standards: Chemical Requirements for Tantalum

ASTM B365, B708: Additional Chemical Requirements for Finished Product* (When specified by the purchaser) Content, Maximum % Weight Grades
Element	Electron-Beam Cast (R05200) Unalloyed Tantalum	Sintered (R05400) Unalloyed Tantalum	Electron-Beam Cast (R05255) 90% Tantalum 10% Tungsten	Electron-Beam Cast (R05252) 97% Tantalum 2.5% Tungsten	Electron-Beam Cast (R05240) 60% Tantalum 40% Niobium
O	0.025	0.035	0.025	0.025	0.025
N	0.010	0.010	0.010	0.010	0.010
C	0.0015	0.0015	0.0015	0.0015	0.0015
H	0.020	0.020	0.020	0.020	0.020
*Certifiable per ASTM B365 and B708, report values for ASTM B521

ASTM B364, B365, B521, B708: Chemical Requirements for Tantalum and Tantalum Alloy Ingots (Content, Maximum Weight %)
Element	Electron Beam Cast (R05200) Unalloyed Ta	Sintered (R05400) Unalloyed Ta	Electron Beam Cast (R05255) 90% Ta 10% W	Electron Beam Cast (R05252) 97.5% Ta 2.5% W	Electron Beam Cast (R05240) 60% Ta 40% Nb
C	0.010	0.010	0.010	0.010	0.010
O	0.015	0.030	0.015	0.015	0.020
N	0.010	0.010	0.010	0.010	0.010
H	0.0015	0.0015	0.0015	0.0015	0.0015
Nb	0.100	0.100	0.100	0.500	35.0-42.0
Fe	0.010	0.010	0.10	0.010	0.010
Ti	0.010	0.010	0.10	0.010	0.010
W	0.050	0.050	9.0-11.0	2.0-3.5	0.050
Mo	0.020	0.020	0.020	0.020	0.020
Si	0.005	0.005	0.005	0.005	0.005
Ni	0.010	0.010	0.010	0.010	0.010
Ta	remainder	remainder	remainder	remainder	remainder