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<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;">50号钢：</span></p>
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<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;">中碳高强度碳素</span>结构钢<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;">，</span>淬火<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;">后具有高的强度和硬度，该</span>钢<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;">可切削性中等，</span>冷变形<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;">塑性低，焊接性差，热处理时无回火脆性，但淬透性较低，水中临界</span>直径<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;">为13*30mm，且水淬时有开裂倾向。此钢通常在正火或淬火</span>回火<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;">，或高频表面淬火等热处理后使用。</span></p>
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<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;">化学成分：</span></p>
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<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;">质量分数<span style="margin: 0px; padding: 0px; outline: 0px; line-height: 28px;">，%）</span></span></p>
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<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;"><span style="margin: 0px; padding: 0px; outline: 0px; line-height: 28px;">C 0.47~0.55、</span></span></p>
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<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;"><span style="margin: 0px; padding: 0px; outline: 0px; line-height: 28px;">Si 0.17~0.37、</span></span></p>
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<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;"><span style="margin: 0px; padding: 0px; outline: 0px; line-height: 28px;">Mn 0.50~0.80、</span></span></p>
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<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;"><span style="margin: 0px; padding: 0px; outline: 0px; line-height: 28px;">P≤0.035、</span></span></p>
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<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;"><span style="margin: 0px; padding: 0px; outline: 0px; line-height: 28px;">S≤0.035、</span></span></p>
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<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;"><span style="margin: 0px; padding: 0px; outline: 0px; line-height: 28px;">Ni≤0.30、</span></span></p>
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<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;"><span style="margin: 0px; padding: 0px; outline: 0px; line-height: 28px;">Cr≤0.15、</span></span></p>
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<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;"><span style="margin: 0px; padding: 0px; outline: 0px; line-height: 28px;">Cu≤0.25、</span></span></p>
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力学性能：</p>
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抗拉强度 σb (MPa)：≥630(64)</p>
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屈服强度 σs (MPa)：≥375(38)</p>
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伸长率 δ5 (%)：≥14</p>
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断面收缩率 ψ (%)：≥40</p>
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冲击功 Akv (J)：≥31(4)</p>
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冲击韧性值 αkv (J/cm&sup2;)：≥39(4)</p>
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硬度 ：未热处理，≤241HB;退火钢，≤207HB</p>
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试样尺寸：试样尺寸为25mm.</p>
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适用类型：</p>
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参考对应钢号 德国DIN标准材料编号1.1213、德国DIN标准钢号Cf53、我国GB的标准钢号是50、英国BS标准钢号060A52、法国AFNOR标准钢号XC48TS、法国NF标准钢号C50、意大利UNI标准钢号C53、比利时NBN标准钢号C53、瑞典SS标准钢号1674、美国AISI/SAE/ASTM标准钢号1050、日本JIS标准钢号S50C/S53C、国际标准化组织ISO标准钢号C50E4。</p>
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临界点温度 （近似值） Ac1=725℃，Ac3=760℃，Ar3=721℃，Ar1=690℃</p>
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正火规范 温度830℃±10℃，空气冷却。</p>
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普通淬火、回火规范 淬火温度830℃ ±10℃，水、油冷却；回火温度600℃±10℃，水、油冷却。</p>
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制造动负载、冲击载荷不大以及要求耐磨性好的机械零件，如锻造齿轮、轴摩擦盘、机床主轴、发动机主轴、轧辊、拉杆、弹簧垫圈等。</p>
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特性及应用=未热处理时：HB≤241；热处理：正火；冲击功：Aku≥31J；强度较高，塑性和韧性较差，切削性中等，焊接性差，水淬时有形成裂纹的倾向。一般正火，调质状态下使用，用作要求较高强度、耐磨性或弹性、动载荷及冲击负荷不大的零件，如齿轮、轧辊、机床主轴、连杆、次要弹簧等</p>
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