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<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;">20CrMn,是中国国家标准规定的一种合金结构钢的牌号。统一数字代号:A22202。标准:GB/T 3077-1988。20CrMn是</span>渗碳钢<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;">,也可用作调质钢,淬透性与20CrNi相近。用作在高速与高弯曲负荷下工作的轴、连杆,在高速、高负荷而无强冲击负荷下工作的齿轮轴、齿轮、水泵转子、离合器、小轴、</span>心轴<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;">,在化工设备上可作高压容器盖板的螺栓;可部分代替42CrMo和40CrNi钢</span></p>
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<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 20px; color: rgb(34, 34, 34); font-family: 'microsoft yahei', Arial, Helvetica, sans-serif;">化学成分</span>折叠<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; line-height: 16px;">编辑本段</span></h2>
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质量分数(%):<br style="margin: 0px; padding: 0px;" />
碳 C :0.17~0.23<img src="http://i6.qhimg.com/dr/200__/t01339ade7e5d40b585.jpg" style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; border: none;" /><br style="margin: 0px; padding: 0px;" />
硅 Si:0.17~0.37<br style="margin: 0px; padding: 0px;" />
锰 Mn:0.90~1.20<br style="margin: 0px; padding: 0px;" />
硫 S :允许残余含量≤0.035<br style="margin: 0px; padding: 0px;" />
磷 P :允许残余含量≤0.035<br style="margin: 0px; padding: 0px;" />
铬 Cr:0.90~1.20<br style="margin: 0px; padding: 0px;" />
镍 Ni:允许残余含量≤0.030 铜 Cu:允许残余含量≤0.030</div>
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<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 20px; color: rgb(34, 34, 34); font-family: 'microsoft yahei', Arial, Helvetica, sans-serif;">力学性能</span>折叠<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; line-height: 16px;">编辑本段</span></h2>
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【试样毛坯尺寸】<br style="margin: 0px; padding: 0px;" />
15mm<br style="margin: 0px; padding: 0px;" />
【热处理】<br style="margin: 0px; padding: 0px;" />
淬火加热温度(℃):850;冷却剂:油<br style="margin: 0px; padding: 0px;" />
回火加热温度(℃):200;冷却剂:水、空<br style="margin: 0px; padding: 0px;" />
【力学性能】<br style="margin: 0px; padding: 0px;" />
抗拉强度σb (MPa):≥930(95)<br style="margin: 0px; padding: 0px;" />
屈服强度σs (MPa):≥735(75)<br style="margin: 0px; padding: 0px;" />
伸长率 δ5 (%):≥10<br style="margin: 0px; padding: 0px;" />
断面收缩率 ψ (%):≥45<br style="margin: 0px; padding: 0px;" />
冲击功 Akv (J):≥47<br style="margin: 0px; padding: 0px;" />
冲击韧性值 αkv (J/cm2):≥59(6)<br style="margin: 0px; padding: 0px;" />
布氏硬度(HBS100/3000)(退火或高温回火状态):≦187<br style="margin: 0px; padding: 0px;" />
<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-weight: 700;">交货状态:</span>以热处理(正火、退火或高温回火)或不热处理状态交货,交货状态应在合同中注明。</div>
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