铸造工、模具钢的回火工艺
<TABLE cellSpacing=0 cellPadding=0 border=1><TBODY>
<TR>
<TD vAlign=top width=143 rowSpan=2>
<P align=center><STRONG>牌号</STRONG></P></TD>
<TD vAlign=top width=258 colSpan=3>
<P align=center><STRONG>回火规范</STRONG></P></TD>
<TD vAlign=top width=85 rowSpan=2>
<P align=center><STRONG>冷却方式</STRONG></P></TD>
<TD vAlign=top width=83 rowSpan=2>
<P align=center><STRONG>回火后硬度</STRONG></P></TD></TR>
<TR>
<TD vAlign=top width=89>
<P align=center>温度／℃</P></TD>
<TD vAlign=top width=84>
<P align=center>次数</P></TD>
<TD vAlign=top width=84>
<P align=center>保温时间／</P></TD></TR>
<TR>
<TD vAlign=top width=143>
<P>ZGW18Cr4V</P></TD>
<TD vAlign=top width=89>
<P> 550</P></TD>
<TD vAlign=top width=84>
<P align=center>3</P></TD>
<TD vAlign=top width=84>
<P align=center>1.5</P></TD>
<TD vAlign=top width=85>
<P align=center>空</P></TD>
<TD vAlign=top width=83>
<P align=center>＞62</P></TD></TR>
<TR>
<TD vAlign=top width=143>
<P align=left>ZGW9Cr4V</P></TD>
<TD vAlign=top width=89>
<P align=center>570~590</P></TD>
<TD vAlign=top width=84>
<P align=center>4</P></TD>
<TD vAlign=top width=84>
<P align=center>1.5</P></TD>
<TD vAlign=top width=85>
<P align=center>空</P></TD>
<TD vAlign=top width=83>
<P align=center>≥63</P></TD></TR>
<TR>
<TD vAlign=top width=143>
<P align=left>ZG4Cr5MoSiV1(H13)</P></TD>
<TD vAlign=top width=89>
<P align=center>590~630</P></TD>
<TD vAlign=top width=84>
<P align=center>2~3</P></TD>
<TD vAlign=top width=84>
<P align=center>1.5</P></TD>
<TD vAlign=top width=85>
<P align=center>空</P></TD>
<TD vAlign=top width=83>
<P align=center>45~48</P></TD></TR>
<TR>
<TD vAlign=top width=143>
<P align=left>ZG5CrMnMo</P></TD>
<TD vAlign=top width=89>
<P align=center>620~650</P></TD>
<TD vAlign=top width=84>
<P align=center>1</P></TD>
<TD vAlign=top width=84>
<P align=center>2~3</P></TD>
<TD vAlign=top width=85>
<P align=center>空</P></TD>
<TD vAlign=top width=83>
<P align=center>34~47</P></TD></TR>
<TR>
<TD vAlign=top width=143>
<P align=left>ZG5CrNiMo</P></TD>
<TD vAlign=top width=89>
<P align=center>490~580</P>
<P align=center>490~540</P></TD>
<TD vAlign=top width=84>
<P align=center>1</P></TD>
<TD vAlign=top width=84>
<P align=center>2~3</P></TD>
<TD vAlign=top width=85>
<P align=center>油冷至100℃以下空冷</P></TD>
<TD vAlign=top width=83>
<P align=center>38~47</P></TD></TR></TBODY></TABLE>
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