<p style="word-wrap: break-word; margin: 5px 0px; color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px; text-align: center;"> <span style="font-family: arial, sans-serif; font-size: 32px; line-height: 28px;"><strong>20Mn2</strong></span></p> <p style="word-wrap: break-word; margin: 5px 0px; color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;"> <span style="font-family: arial, sans-serif; font-size: 14px; line-height: 28px;">??</span></p> <p style="word-wrap: break-word; margin: 5px 0px; color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;"> <span style="font-family: arial, sans-serif; font-size: 24px; line-height: 28px;"><span style="color: rgb(51, 51, 51); font-family: arial, 宋体, sans-serif; font-size: 24px; line-height: 24px;"><strong>热处理:</strong></span></span></p> <p style="word-wrap: break-word; margin: 5px 0px; color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;"> &nbsp;</p> <p style="word-wrap: break-word; margin: 5px 0px; color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;"> <span style="font-family: arial, sans-serif; font-size: 14px; line-height: 28px;"><span style="color: rgb(51, 51, 51); font-family: arial, 宋体, sans-serif; font-size: 18px; line-height: 24px;">回火温度/℃ 220 冷却剂 水.空 热处理：淬火（水、油淬）第一次淬火850、回火（水、空冷）、渗碳。</span><span style="font-size: 18px;">?</span></span></p> <p style="word-wrap: break-word; margin: 5px 0px; color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;"> &nbsp;</p> <p style="word-wrap: break-word; margin: 5px 0px; color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;"> <font face="arial, sans-serif"><span style="font-size: 24px; line-height: 28px;"><strong>物理性能：</strong></span></font></p> <p style="word-wrap: break-word; margin: 5px 0px; color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;"> &nbsp;</p> <p style="word-wrap: break-word; margin: 5px 0px; color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;"> &nbsp;</p> <div style="word-wrap: break-word; color: rgb(51, 51, 51); margin: 15px 0px 5px; font-family: arial, 宋体, sans-serif; font-size: 14px;"> <font face="arial, sans-serif"><span style="font-size: 18px;">抗拉强度&ge;785MPa</span></font></div> <div style="word-wrap: break-word; color: rgb(51, 51, 51); margin: 15px 0px 5px; font-family: arial, 宋体, sans-serif; font-size: 14px;"> <font face="arial, sans-serif"><span style="font-size: 18px;">屈服极限&ge;590MPa</span></font></div> <div style="word-wrap: break-word; color: rgb(51, 51, 51); margin: 15px 0px 5px; font-family: arial, 宋体, sans-serif; font-size: 14px;"> <font face="arial, sans-serif"><span style="font-size: 18px;">伸长率&ge;10%</span></font></div> <div style="word-wrap: break-word; color: rgb(51, 51, 51); margin: 15px 0px 5px; font-family: arial, 宋体, sans-serif; font-size: 14px;"> <font face="arial, sans-serif"><span style="font-size: 18px;">断面收缩率&ge;40%</span></font></div> <div style="word-wrap: break-word; color: rgb(51, 51, 51); margin: 15px 0px 5px; font-family: arial, 宋体, sans-serif; font-size: 14px;"> <font face="arial, sans-serif"><span style="font-size: 18px;">冲击吸收功&ge;47Aku2/J</span></font></div> <div style="word-wrap: break-word; color: rgb(51, 51, 51); margin: 15px 0px 5px; font-family: arial, 宋体, sans-serif; font-size: 14px;"> <font face="arial, sans-serif"><span style="font-size: 18px;">硬度：&le;187HB</span></font></div> <p> <font face="arial, sans-serif"><span style="font-size: 18px;">?</span></font></p> <p> &nbsp;</p> <p style="word-wrap: break-word; margin: 5px 0px; color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;"> &nbsp;</p> <h3 style="font-size: 18px; font-family: 'Microsoft YaHei', SimHei, Verdana; font-weight: 500;"> <font face="arial, sans-serif"><span style="font-size: 24px;"><strong>主要特性</strong></span></font></h3> <p style="word-wrap: break-word; margin: 5px 0px;"> &nbsp;</p> <div style="word-wrap: break-word; color: rgb(51, 51, 51); margin: 15px 0px 5px; font-family: arial, 宋体, sans-serif; font-size: 14px;"> <font face="arial, sans-serif"><span style="font-size: 18px;">具有中等强度。冷变形时塑性高，低温性能良好，焊接性及可切削性尚可。与相应含碳量的碳钢相比，其淬透性较高，在油中临界淬透直径达4～15 mm，但热处理时有过热、脱碳敏感性及回火</span><span style="font-size: 18px;">脆性倾向。</span></font></div> <p style="word-wrap: break-word; margin: 5px 0px;"> <font face="arial, sans-serif"><span style="font-size: 18px;">这类钢,由于具有合适的淬透性，经适宜的金属热处理后，显微组织为均匀的索氏体、贝氏体或极细的珠光体，因而具有较高的抗拉强度</span><span style="font-size: 18px;">。</span></font></p> <p style="word-wrap: break-word; margin: 5px 0px;"> &nbsp;</p> <h3 style="font-size: 18px; font-family: 'Microsoft YaHei', SimHei, Verdana; font-weight: 500;"> <font face="arial, sans-serif"><span style="font-size: 24px;">应用举例</span></font></h3> <p style="word-wrap: break-word; margin: 5px 0px;"> &nbsp;</p> <div style="word-wrap: break-word; color: rgb(51, 51, 51); margin: 15px 0px 5px; font-family: arial, 宋体, sans-serif; font-size: 14px;"> <font face="arial, sans-serif"><span style="font-size: 18px;">用来制造对表面和心部要求不高的、截面尺寸直径&lt;50mm的渗碳零件，如汽车、拖拉机</span><span style="font-size: 18px;">及机床制造中代替20Cr钢制作渗碳的小齿轮、小轴，低要求的活塞销，十字销头，柴油机套筒，汽门顶杆，变速箱操纵杆、钢套等。此外，这种钢在热轧及正火状态下亦可用于制造铆焊件和螺钉、螺帽等。</span></font></div> <p> <font face="arial, sans-serif">?</font></p> <p> &nbsp;</p> <p style="word-wrap: break-word; margin: 5px 0px; color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;"> &nbsp;</p> <p style="word-wrap: break-word; margin: 5px 0px; color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;"> <span style="font-family: arial, sans-serif; line-height: 28px; font-size: 24px;"><strong>化学成分：</strong></span></p> <p style="word-wrap: break-word; margin: 5px 0px; color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;"> &nbsp;</p> <p style="word-wrap: break-word; margin: 5px 0px; color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;"> <span style="font-family: arial, sans-serif; font-size: 18px; line-height: 28px;">（%）：</span></p> <p> <span style="color: rgb(0, 0, 0); font-family: arial, sans-serif; font-size: 18px; line-height: 28px;">碳C: 0.17~0.24</span><br style="color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;" /> <span style="color: rgb(0, 0, 0); font-family: arial, sans-serif; font-size: 18px; line-height: 28px;">硅Si: 0.17~0.37</span><br style="color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;" /> <span style="color: rgb(0, 0, 0); font-family: arial, sans-serif; font-size: 18px; line-height: 28px;">锰Mn:1.40~1.80</span><br style="color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;" /> <span style="color: rgb(0, 0, 0); font-family: arial, sans-serif; font-size: 18px; line-height: 28px;">磷P ：&le;0.025</span><br style="color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;" /> <span style="color: rgb(0, 0, 0); font-family: arial, sans-serif; font-size: 18px; line-height: 28px;">硫S ：&le;0.025&nbsp;</span><br style="color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;" /> <span style="color: rgb(0, 0, 0); font-family: arial, sans-serif; font-size: 18px; line-height: 28px;">铬 Cr：&le;0.30</span><br style="color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;" /> <span style="color: rgb(0, 0, 0); font-family: arial, sans-serif; font-size: 18px; line-height: 28px;">镍 Ni：&le;0.30</span></p> <p style="word-wrap: break-word; margin: 5px 0px; color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;"> <span style="font-family: arial, sans-serif; font-size: 18px; line-height: 28px;">铜 Cu：&le;0.25&nbsp;</span></p> <p style="word-wrap: break-word; margin: 5px 0px; color: rgb(0, 0, 0); font-family: 'sans serif', tahoma, verdana, helvetica; font-size: 12px; line-height: 18px;"> &nbsp;</p>