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<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, 宋體, sans-serif; font-size: 24px; line-height: 24px;"><strong>熱處理:</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, 宋體, sans-serif; font-size: 18px; line-height: 24px;">回火溫度/℃ 220 冷卻劑 水.空 熱處理：淬火（水、油淬）第一次淬火850、回火（水、空冷）、滲碳。</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, 宋體, sans-serif; font-size: 14px;"> <font face="arial, sans-serif"><span style="font-size: 18px;">抗拉強(qiáng)度&ge;785MPa</span></font></div> <div style="word-wrap: break-word; color: rgb(51, 51, 51); margin: 15px 0px 5px; font-family: arial, 宋體, sans-serif; font-size: 14px;"> <font face="arial, sans-serif"><span style="font-size: 18px;">屈服極限&ge;590MPa</span></font></div> <div style="word-wrap: break-word; color: rgb(51, 51, 51); margin: 15px 0px 5px; font-family: arial, 宋體, sans-serif; font-size: 14px;"> <font face="arial, sans-serif"><span style="font-size: 18px;">伸長率&ge;10%</span></font></div> <div style="word-wrap: break-word; color: rgb(51, 51, 51); margin: 15px 0px 5px; font-family: arial, 宋體, sans-serif; font-size: 14px;"> <font face="arial, sans-serif"><span style="font-size: 18px;">斷面收縮率&ge;40%</span></font></div> <div style="word-wrap: break-word; color: rgb(51, 51, 51); margin: 15px 0px 5px; font-family: arial, 宋體, sans-serif; font-size: 14px;"> <font face="arial, sans-serif"><span style="font-size: 18px;">沖擊吸收功&ge;47Aku2/J</span></font></div> <div style="word-wrap: break-word; color: rgb(51, 51, 51); margin: 15px 0px 5px; font-family: arial, 宋體, 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, 宋體, sans-serif; font-size: 14px;"> <font face="arial, sans-serif"><span style="font-size: 18px;">具有中等強(qiáng)度。冷變形時塑性高，低溫性能良好，焊接性及可切削性尚可。與相應(yīng)含碳量的碳鋼相比，其淬透性較高，在油中臨界淬透直徑達(dá)4～15 mm，但熱處理時有過熱、脫碳敏感性及回火</span><span style="font-size: 18px;">脆性傾向。</span></font></div> <p style="word-wrap: break-word; margin: 5px 0px;"> <font face="arial, sans-serif"><span style="font-size: 18px;">這類鋼,由于具有合適的淬透性，經(jīng)適宜的金屬熱處理后，顯微組織為均勻的索氏體、貝氏體或極細(xì)的珠光體，因而具有較高的抗拉強(qiáng)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;">應(yīng)用舉例</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, 宋體, sans-serif; font-size: 14px;"> <font face="arial, sans-serif"><span style="font-size: 18px;">用來制造對表面和心部要求不高的、截面尺寸直徑&lt;50mm的滲碳零件，如汽車、拖拉機(jī)</span><span style="font-size: 18px;">及機(jī)床制造中代替20Cr鋼制作滲碳的小齒輪、小軸，低要求的活塞銷，十字銷頭，柴油機(jī)套筒，汽門頂桿，變速箱操縱桿、鋼套等。此外，這種鋼在熱軋及正火狀態(tài)下亦可用于制造鉚焊件和螺釘、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>化學(xué)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;">錳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;">鉻 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;">鎳 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;">銅 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>