冷挤压钢的球化退火工艺规范
<TABLE class=table1 borderColor=#b5dba1 cellSpacing=0 cellPadding=0 width=770 border=1><TBODY>
<TR>
<TD class=blk12 align=middle width=128 bgColor=#fdfbea>钢 号</TD>
<TD class=blk12 align=middle width=91 bgColor=#fdfbea>退火前硬度（HB）</TD>
<TD class=blk12 align=middle width=79 bgColor=#fdfbea>加热温 度（℃）</TD>
<TD class=blk12 align=middle width=85 bgColor=#fdfbea>保温时间（h）</TD>
<TD class=blk12 align=middle width=120 bgColor=#fdfbea>等温温度及时间（℃-h）</TD>
<TD class=blk12 align=middle width=89 bgColor=#fdfbea>冷却速度（℃/h）</TD>
<TD class=blk12 align=middle width=74 bgColor=#fdfbea>出炉温度（℃）</TD>
<TD class=blk12 align=middle width=88 bgColor=#fdfbea>退火后硬度（HB）</TD></TR>
<TR>
<TD>15Cr,20Cr</TD>
<TD>170</TD>
<TD>860±10</TD>
<TD>3～4</TD>
<TD>-</TD>
<TD><50</TD>
<TD><130</TD>
<TD>300</TD></TR>
<TR>
<TD>15Cr,20Cr</TD>
<TD>170</TD>
<TD>780±10</TD>
<TD>2～3</TD>
<TD>700±10-6～8</TD>
<TD></TD>
<TD>125～131</TD>
<TD>500</TD></TR>
<TR>
<TD>15Cr,20Cr</TD>
<TD>170</TD>
<TD>720</TD>
<TD>5～6</TD>
<TD>-</TD>
<TD><50</TD>
<TD>≤125</TD>
<TD>450</TD></TR>
<TR>
<TD>35,45,40MnB</TD>
<TD>>180</TD>
<TD>720</TD>
<TD>6～7</TD>
<TD>-</TD>
<TD><50</TD>
<TD>≤145</TD>
<TD>550</TD></TR>
<TR>
<TD>08,15,20</TD>
<TD>150～180</TD>
<TD>720</TD>
<TD>2～3</TD>
<TD>-</TD>
<TD>空冷</TD>
<TD>≤120</TD>
<TD>-</TD></TR>
<TR>
<TD>20MnV,40Cr,50</TD>
<TD>187～217</TD>
<TD>950～1000</TD>
<TD>1～1.5</TD>
<TD>700-2～2.5</TD>
<TD>60</TD>
<TD>140</TD>
<TD>500</TD></TR>
<TR>
<TD>40Cr</TD>
<TD>-</TD>
<TD>770±10</TD>
<TD>4～5</TD>
<TD>670±10-5～6</TD>
<TD>炉冷</TD>
<TD>≤160</TD>
<TD>500</TD></TR></TBODY></TABLE>
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