Значение и использование

These test methods for the chemical analysis of metals and alloys are primarily intended to test such materials for compliance with compositional specifications such as Specification A550. It is assumed that all who use these test methods will be trained analysts capable of performing common laboratory procedures skillfully and safely. It is expected that work will be performed in a properly equipped laboratory.

Область применения

1.1 These test methods cover the chemical analysis of ferroniobium having chemical compositions within the following limits:

ElementConcentration, % Aluminum2.00 max Carbon0.30 max Chromium2.00 max Cobalt0.25 max Lead0.01 max Manganese3.00 max Niobium40.00 to 75.00 Phosphorus0.05 max Silicon4.00 max Sulfur0.03 max Tantalum7.00 max Tin0.15 max Titanium5.00 max Tungsten0.50 max

1.2 The test methods appear in the following order:

Sections Separation of Niobium, Tantalum, and Titanium
by the Ion-Exchange Test Method10-16 Titanium by the Photometric Test Method [0.05 % to 5.0 %]17-21 Niobium by the Gravimetric Test Method [40 % to 75 %]22-23 Tantalum by the Gravimetric Test Method [1 % to 7 %]24-25 Tantalum by the Photometric Test Method [0.25 % to 1 %]26-30

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 6, and specific warning statements in 11.1.

10.1 These test methods cover the determination of niobium, tantalum, and titanium in ferroniobium from 40 % to 75 %, 0.25 % to 7 %, and 0.05 % to 5.0 %, respectively.