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适用范围：<p>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 <a href="http://myastm.astm.org/SUBSCRIPTION/NewValidateSubscription.cgi?A550-HTML">A550</a>. 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.</p><p id="s00002">1.1 These test methods cover the chemical analysis of ferroniobium having chemical compositions within the following limits:<br> <p id="n00001"><table summary="TABLE 1" frame="void" id="n00001" class="rules"> <tr><td align="center" valign="top"> </td><td>Element</td><td align="center" valign="top">Concentration, %</td></tr> <tr><td align="center" valign="top"></td><td align="left" valign="top">Aluminum</td><td align="center" valign="top">2.00 max</td></tr> <tr><td align="left" valign="top"> </td><td>Carbon</td><td align="center" valign="top">0.30 max</td></tr> <tr><td align="left" valign="top"> </td><td>Chromium</td><td align="center" valign="top">2.00 max</td></tr> <tr><td align="left" valign="top"> </td><td>Cobalt</td><td align="center" valign="top">0.25 max</td></tr> <tr><td align="left" valign="top"> </td><td>Lead</td><td align="center" valign="top">0.01 max</td></tr> <tr><td align="left" valign="top"> </td><td>Manganese</td><td align="center" valign="top">3.00 max</td></tr> <tr><td align="left" valign="top"> </td><td>Niobium</td><td align="center" valign="top">40.00 to 75.00</td></tr> <tr><td align="left" valign="top"> </td><td>Phosphorus</td><td align="center" valign="top">0.05 max</td></tr> <tr><td align="left" valign="top"> </td><td>Silicon</td><td align="center" valign="top">4.00 max</td></tr> <tr><td align="left" valign="top"> </td><td>Sulfur</td><td align="center" valign="top">0.03 max</td></tr> <tr><td align="left" valign="top"> </td><td>Tantalum</td><td align="center" valign="top">7.00 max</td></tr> <tr><td align="left" valign="top"> </td><td>Tin</td><td align="center" valign="top">0.15 max</td></tr> <tr><td align="left" valign="top"> </td><td>Titanium</td><td align="center" valign="top">5.00 max</td></tr> <tr><td align="left" valign="top"> </td><td>Tungsten</td><td align="center" valign="top">0.50 max</td></tr></table></p></p> <p id="s00003">1.2 The test methods appear in the following order:<p id="n00002"><table summary="TABLE 2" frame="void" id="n00002" class="rules"> <tr><td align="left" valign="top"></td><td align="center" valign="top">Sections</td></tr> <tr><td align="left" valign="top">Separation of Niobium, Tantalum, and Titanium <br> by the Ion-Exchange Test Method</td><td align="center" valign="top">10-16</td></tr> <tr><td align="left" valign="top"> Titanium by the Photometric Test Method [0.05 % to 5.0 %]</td><td align="center" valign="top">17-21</td></tr> <tr><td align="center" valign="top"> Niobium by the Gravimetric Test Method [40 % to 75 %]</td><td align="center" valign="top">22-23</td></tr> <tr><td align="center" valign="top"> Tantalum by the Gravimetric Test Method [1 % to 7 %]</td><td align="center" valign="top">24-25</td></tr> <tr><td align="center" valign="top"> Tantalum by the Photometric Test Method [0.25 % to 1 %]</td><td align="center" valign="top">26-30</td></tr></table></p></p> <p id="s10003">1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.</p> <p id="s00004">1.4 <span class="italic">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. <span class="med">Specific precautionary statements are given in Section 6, and specific warning statements in......