蠕墨铸铁的牌号
<TABLE borderColor=#000000 height=376 cellSpacing=0 cellPadding=1 width=530 align=center border=1><TBODY>
<TR>
<TD rowSpan=2>
<P align=center>牌号</P></TD>
<TD>
<P align=center>σb/MPa（kgf/mm<SUP>2</SUP>)</P></TD>
<TD>
<P align=center>σ<SUB>0.2</SUB>/MPa（kgf/mm<SUP>2</SUP>)</P></TD>
<TD>
<P align=center>δ(%) </P></TD>
<TD rowSpan=2>
<P align=center>硬度值范围HB</P></TD>
<TD>
<P align=center>蠕化率（%）</P></TD>
<TD rowSpan=2>
<P align=center>主要基体组织</P></TD></TR>
<TR>
<TD colSpan=3>
<P align=center>不小于</P></TD>
<TD>
<P align=center>不小于</P></TD></TR>
<TR>
<TD>
<P align=center>RuT420</P></TD>
<TD>
<P align=center>420(42.8)</P></TD>
<TD>
<P align=center>335(34.2)</P></TD>
<TD>
<P align=center>0.75</P></TD>
<TD>
<P align=center>200~280</P></TD>
<TD rowSpan=5>
<P align=center>50</P></TD>
<TD>
<P align=center>珠光体</P></TD></TR>
<TR>
<TD>
<P align=center>RuT380</P></TD>
<TD>
<P align=center>380(38.7)</P></TD>
<TD>
<P align=center>300(30.6)</P></TD>
<TD>
<P align=center>0.75</P></TD>
<TD>
<P align=center>193~274</P></TD>
<TD>
<P align=center>珠光体</P></TD></TR>
<TR>
<TD>
<P align=center>RuT340</P></TD>
<TD>
<P align=center>340(34.7)</P></TD>
<TD>
<P align=center>270(27.5)</P></TD>
<TD>
<P align=center>1.0</P></TD>
<TD>
<P align=center>170~249</P></TD>
<TD>
<P align=center>珠光体＋铁素体</P></TD></TR>
<TR>
<TD>
<P align=center>RuT300</P></TD>
<TD>
<P align=center>300(30.6)</P></TD>
<TD>
<P align=center>240(24.5)</P></TD>
<TD>
<P align=center>1.5</P></TD>
<TD>
<P align=center>140~217</P></TD>
<TD>
<P align=center>铁素体＋珠光体</P></TD></TR>
<TR>
<TD>
<P align=center>RuT260</P></TD>
<TD>
<P align=center>260(26.5)</P></TD>
<TD>
<P align=center>195(19.9)</P></TD>
<TD>
<P align=center>3</P></TD>
<TD>
<P align=center>121~197</P></TD>
<TD>
<P align=center>铁素体</P></TD></TR></TBODY></TABLE>
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