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40Mn2</h1>
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<span style="font-size: 24px;">40Mn2,合金结构钢。</span></p>
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<span style="font-size: 24px;">【主要特性】</span></p>
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<span style="font-size: 18px;">这是一种中碳调质锰钢,钢的强度、塑性和耐磨性都较高,可切削性及热处理工艺性能亦好,在油中临界淬透直径达8.5~23mm,在水中临界淬透直径达20~42mm;但存在回火脆性和过热敏感性,而且淬火时易于开裂。此钢有白点敏感性,冷变形塑性不高,焊接性差,需要预热到100~425℃后方可焊接。</span></p>
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<span style="font-size: 24px;">【应用举例】</span></p>
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<span style="font-size: 18px;">一般在调质状态下使用,可用于制造重负荷条件下工作的零件,如轴、曲轴、车轴、活塞杆、蜗杆、杠杆、连杆、有负荷的螺栓、螺钉、加固环、弹簧以及其它调质件。一般用于直径小于50mm的小截面重要零件时,这种钢的静强度及疲劳性能均与40Cr钢相当,故可作40Cr的代用钢。</span></p>
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<span style="font-size: 24px;">【化学成分】(质量分数)(%)</span></p>
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<span style="font-size: 18px;">锰Mn:1.40~1.80</span></div>
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<span style="font-size: 18px;">磷 P:《0.030 (残留含量)</span></div>
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<span style="font-size: 18px;">硫 S:《0.030 (残留含量)</span></div>
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<span style="font-size: 18px;">铬 Cr:≤0.30 (残留含量)</span></div>
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<span style="font-size: 18px;">镍 Ni:≤0.30 (残留含量)</span></div>
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<span style="font-size: 18px;">铜 Cu:≤0.25 (残留含量)</span></div>