冲天炉熔炼的中锰抗磨球墨铸铁
<TABLE cellSpacing=0 cellPadding=0 border=1><TBODY>
<TR>
<TD vAlign=top width=132 colSpan=2>
<P align=center><STRONG>铸件</STRONG></P></TD>
<TD vAlign=top width=487 colSpan=7>
<P align=center><STRONG>球磨机磨球衬板选矿搅拌机叶片等</STRONG></P></TD></TR>
<TR>
<TD vAlign=top width=60 rowSpan=2>
<P align=center>铸铁成分(%)</P></TD>
<TD vAlign=top width=72>
<P align=center>牌号</P></TD>
<TD vAlign=top width=60>
<P align=center>C</P></TD>
<TD vAlign=top width=60>
<P align=center>Si</P></TD>
<TD vAlign=top width=60>
<P align=center>Mn</P></TD>
<TD vAlign=top width=89>
<P align=center>P</P></TD>
<TD vAlign=top width=53>
<P align=center>S</P></TD>
<TD vAlign=top width=164 colSpan=2>
<P align=center>其他 </P></TD></TR>
<TR>
<TD vAlign=top width=72>
<P align=center>MQTMn6</P></TD>
<TD vAlign=top width=60>
<P align=center>3.3~3.8</P></TD>
<TD vAlign=top width=60>
<P align=center>3.3~4.0</P></TD>
<TD vAlign=top width=60>
<P align=center>5.5~6.5</P></TD>
<TD vAlign=top width=89>
<P align=center><0.15</P></TD>
<TD vAlign=top width=53>
<P align=center><0.02</P></TD>
<TD vAlign=top width=164 colSpan=2>
<P align=center>RE0.025~0.06</P>
<P align=center>Mg0.03~0.06</P></TD></TR>
<TR>
<TD vAlign=top width=60 rowSpan=2>
<P>炉料(%)</P></TD>
<TD vAlign=top width=132 colSpan=2>
<P align=center>生铁Z20</P></TD>
<TD vAlign=top width=60>
<P align=center>回炉料</P></TD>
<TD vAlign=top width=60>
<P align=center>FeSi75</P></TD>
<TD vAlign=top width=142 colSpan=2>
<P align=center>FeMn78C1.0</P></TD>
<TD vAlign=top width=57>
<P align=center>石灰石</P></TD>
<TD vAlign=top width=107>
<P align=center>萤石</P></TD></TR>
<TR>
<TD vAlign=top width=132 colSpan=2>
<P align=center>60~75</P></TD>
<TD vAlign=top width=60>
<P align=center>15~20</P></TD>
<TD vAlign=top width=60>
<P align=center>2~3.0</P></TD>
<TD vAlign=top width=142 colSpan=2>
<P align=center>10~12</P></TD>
<TD vAlign=top width=57>
<P align=center>4</P></TD>
<TD vAlign=top width=107>
<P align=center>2</P></TD></TR>
<TR>
<TD vAlign=top width=60>
<P> </P>
<P> </P>
<P align=center>熔炼要点</P></TD>
<TD vAlign=top width=559 colSpan=8>
<UL>
<LI>原铁液(%):C3.4~3.6、Si2.6~3.0、Mn5.5~6.5、P<0.15、S<0.08当Mn>5.0%以后,每增加Mn0.8%~1.2%,相应地增加Si0.3%~0.5%
<LI>出炉温度应>1380℃
<LI>球化剂RE Mg6~12,加入量0.5%~0.7%,孕育剂FeSi75,加入量1.0%~1.2%
<LI>炉前检查(三角试片或圆柱试棒)。 </LI></UL>
<P>a.球化好,合格-断口凹凸不平、粗糙,青灰色或淡灰色,侧面无收缩,打断费力</P>
<P>b.球化良,宜调整-断口平整、细致,银灰色,质脆,可能铁液中含Mn低或Si高</P>
<P>c.球化不良,不合格-断口灰黑色,有片状石墨,侧面无收缩,质脆,易打断</P></TD></TR></TBODY></TABLE>
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