灰铸铁的低温石墨化规范
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<P><STRONG>铸铁基体组织</STRONG></P></TD>
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<P><STRONG>退火规范</STRONG></P></TD>
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<P><STRONG>冷却效果</STRONG></P></TD>
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<P><STRONG>退火效果</STRONG></P></TD></TR>
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<P>原有</P></TD>
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<P>要求</P></TD>
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<P>温度／℃</P></TD>
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<P>保温时间／h</P></TD></TR>
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<P>珠光体</P></TD>
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<P>珠光体+铁素体</P></TD>
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<P>650～750</P></TD>
<TD vAlign=top width=95>
<P>1～5</P></TD>
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<P>炉冷或空冷</P></TD>
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<P>改善可加工型</P></TD></TR>
<TR>
<TD vAlign=top width=95>
<P>珠光体或珠光体+铁素体</P></TD>
<TD vAlign=top width=95>
<P>铁素体</P></TD>
<TD vAlign=top width=95>
<P>650～750</P></TD>
<TD vAlign=top width=95>
<P>8～2</P></TD>
<TD vAlign=top width=95>
<P>炉冷或空冷</P></TD>
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<P>改善可加工性，提高塑性</P></TD></TR></TBODY></TABLE>
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