球墨铸铁单铸试块的力学性能与金相组织
<TABLE cellSpacing=0 cellPadding=0 width="100%" border=1><TBODY>
<TR>
<TD width="16%">
<DIV align=center>牌号</DIV></TD>
<TD width="14%">
<DIV align=center>抗拉强度</DIV>
<DIV align=center>σ<SUB>b</SUB>≥/MPa</DIV></TD>
<TD width="16%">
<DIV align=center>屈服强度</DIV>
<DIV align=center>σ<SUB>0.2</SUB>≥/MPa</DIV></TD>
<TD width="12%">
<DIV align=center>伸长率</DIV>
<DIV align=center>δ<SUB>5</SUB>≥(％)</DIV></TD>
<TD width="14%">
<DIV align=center>硬度</DIV>
<DIV align=center>HBS</DIV></TD>
<TD width="24%">
<DIV align=center>主要金相组织</DIV></TD></TR>
<TR>
<TD width="16%">
<DIV align=center>QT400-18</DIV></TD>
<TD width="14%">
<DIV align=center>400</DIV></TD>
<TD width="16%">
<DIV align=center>250</DIV></TD>
<TD width="12%">
<DIV align=center>18</DIV></TD>
<TD width="14%">
<DIV align=center>130~180</DIV></TD>
<TD width="24%">
<DIV align=center>铁素体</DIV></TD></TR>
<TR>
<TD width="16%">
<DIV align=center>QT400-15</DIV></TD>
<TD width="14%">
<DIV align=center>400</DIV></TD>
<TD width="16%">
<DIV align=center>250</DIV></TD>
<TD width="12%">
<DIV align=center>15</DIV></TD>
<TD width="14%">
<DIV align=center>130~180</DIV></TD>
<TD width="24%">
<DIV align=center>铁素体</DIV></TD></TR>
<TR>
<TD width="16%">
<DIV align=center>QT450-10</DIV></TD>
<TD width="14%">
<DIV align=center>450</DIV></TD>
<TD width="16%">
<DIV align=center>310</DIV></TD>
<TD width="12%">
<DIV align=center>10</DIV></TD>
<TD width="14%">
<DIV align=center>160~210</DIV></TD>
<TD width="24%">
<DIV align=center>铁素体</DIV></TD></TR>
<TR>
<TD width="16%">
<DIV align=center>QT500-7</DIV></TD>
<TD width="14%">
<DIV align=center>500</DIV></TD>
<TD width="16%">
<DIV align=center>320</DIV></TD>
<TD width="12%">
<DIV align=center>7</DIV></TD>
<TD width="14%">
<DIV align=center>170~230</DIV></TD>
<TD width="24%">
<DIV align=center>铁素体＋珠光体</DIV></TD></TR>
<TR>
<TD width="16%">
<DIV align=center>QT600-3</DIV></TD>
<TD width="14%">
<DIV align=center>600</DIV></TD>
<TD width="16%">
<DIV align=center>370</DIV></TD>
<TD width="12%">
<DIV align=center>3</DIV></TD>
<TD width="14%">
<DIV align=center>190~270</DIV></TD>
<TD width="24%">
<DIV align=center>珠光体＋铁素体</DIV></TD></TR>
<TR>
<TD width="16%">
<DIV align=center>QT700-2</DIV></TD>
<TD width="14%">
<DIV align=center>700</DIV></TD>
<TD width="16%">
<DIV align=center>420</DIV></TD>
<TD width="12%">
<DIV align=center>2</DIV></TD>
<TD width="14%">
<DIV align=center>225~305</DIV></TD>
<TD width="24%">
<DIV align=center>珠光体</DIV></TD></TR>
<TR>
<TD width="16%">
<DIV align=center>QT800-2</DIV></TD>
<TD width="14%">
<DIV align=center>800</DIV></TD>
<TD width="16%">
<DIV align=center>480</DIV></TD>
<TD width="12%">
<DIV align=center>2</DIV></TD>
<TD width="14%">
<DIV align=center>245~335</DIV></TD>
<TD width="24%">
<DIV align=center>珠光体或回火组织</DIV></TD></TR>
<TR>
<TD width="16%">
<DIV align=center>QT900-2</DIV></TD>
<TD width="14%">
<DIV align=center>900</DIV></TD>
<TD width="16%">
<DIV align=center>600</DIV></TD>
<TD width="12%">
<DIV align=center>2</DIV></TD>
<TD width="14%">
<DIV align=center>280~360</DIV></TD>
<TD width="24%">
<DIV align=center>贝氏体或回火马氏体</DIV></TD></TR></TBODY></TABLE>
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