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NIOBIUM and ALLOY PLATE, SHEET and STRIP, CONT., P. 2

3.2 Chemical Composition. The chemical composition of each alloy ingot shall conform to Table II.

Table Il

Nb Nb
Element Grade I Grade II C-103 C-129Y Nb-1Zr Cb-752
Tungsten 500 ppm* 500 ppm* 5000 ppm* 9-11% 500 ppm* 9-11%
Hafnium --- --- 9-11% 9-11% 200 ppm* 2000 ppm*
Tantalum 1000 ppm* 3000 ppm* 5000 ppm* 5000 ppm* 1000 ppm* 5000 ppm*
Yttrium --- --- --- .05-3% --- ---
Titanium --- --- .7-1.3% --- --- ---
Zirconium 500 ppm* 500 ppm* 7000 ppm* 5000 ppm* .8-1.2% 2.0-3.0%
Carbon 100 ppm* 100 ppm* 150 ppm* 150 ppm* 200 ppm* 150 ppm*
Oxygen 200 ppm* 200 ppm* 250 ppm* 225 ppm* 300 ppm* 225 ppm*
Nitrogen 100 ppm* 100 ppm* 100 ppm* 100 ppm* 100 ppm* 100 ppm*
Hydrogen 15 ppm* 15 ppm* 15 ppm* 15 ppm* 15 ppm* 15 ppm*
Niobium Bal. Bal. Bal. Bal. Bal. Bal.


*Maximum limits unless otherwise indicated. ppm = Parts Per Million.

3.2.1 Product Analysis. If specified, product analysis shall be performed on C, 02, N and H with maximum levels specified as follows on Parts Per Million (ppm).

Element Nb C-103 C-129Y Nb-1Zr Cb-752
C 100 150 150 200 150
02 200 225 225 300 225
N 100 100 100 100 100
H 15 15 15 15 15

3.3 Tensile Properties. Elongation, yield strength, and ultimate tensile strength shall be measured at room temper-ature on samples transverse to final rolling direction on material which is 0.010" thick or greater. The strain rate shall be maintained at 0.05±0.005Ó/per inch/per minute through the 0.2% offset yield strength and at 0.05 ±0.005"/per inch/per minute thereafter. The material shall have minimum transverse tensile pmperly values as specified in Table Ill.

Table Ill.

Nb C-103 C-129Y Nb-1Zr Cb-752
Ultimate tensile strength, 1000 psi 25 54 80 35 75
Yield strength, 0.2% offset, 1000 psi 11 38 60 15 55
Elongation, % in one inch 35 20 20 20 20

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NIOBIUM PRODUCTS   •  SPECIFICATIONS of NIOBIUM   
NIOBIUM ELECTRONICS APPLICATIONS