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<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;">50號(hào)鋼：</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;">中碳高強(qiáng)度碳素</span>結(jié)構(gòu)鋼<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;">后具有高的強(qiáng)度和硬度，該</span>鋼<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>冷變形<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，熱處理時(shí)無(wú)回火脆性，但淬透性較低，水中臨界</span>直徑<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;">為13*30mm，且水淬時(shí)有開(kāi)裂傾向。此鋼通常在正火或淬火</span>回火<span style="margin: 0px; padding: 0px; outline: 0px; font-size: 14px; font-family: arial, sans-serif; line-height: 25px;">，或高頻表面淬火等熱處理后使用。</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;">化學(xué)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;">質(zhì)量分?jǐn)?shù)<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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力學(xué)性能：</p>
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抗拉強(qiáng)度 σb (MPa)：≥630(64)</p>
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屈服強(qiáng)度 σs (MPa)：≥375(38)</p>
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伸長(zhǎng)率 δ5 (%)：≥14</p>
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斷面收縮率 ψ (%)：≥40</p>
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沖擊功 Akv (J)：≥31(4)</p>
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沖擊韌性值 αkv (J/cm&sup2;)：≥39(4)</p>
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硬度 ：未熱處理，≤241HB;退火鋼，≤207HB</p>
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試樣尺寸：試樣尺寸為25mm.</p>
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適用類(lèi)型：</p>
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參考對(duì)應(yīng)鋼號(hào) 德國(guó)DIN標(biāo)準(zhǔn)材料編號(hào)1.1213、德國(guó)DIN標(biāo)準(zhǔn)鋼號(hào)Cf53、我國(guó)GB的標(biāo)準(zhǔn)鋼號(hào)是50、英國(guó)BS標(biāo)準(zhǔn)鋼號(hào)060A52、法國(guó)AFNOR標(biāo)準(zhǔn)鋼號(hào)XC48TS、法國(guó)NF標(biāo)準(zhǔn)鋼號(hào)C50、意大利UNI標(biāo)準(zhǔn)鋼號(hào)C53、比利時(shí)NBN標(biāo)準(zhǔn)鋼號(hào)C53、瑞典SS標(biāo)準(zhǔn)鋼號(hào)1674、美國(guó)AISI/SAE/ASTM標(biāo)準(zhǔn)鋼號(hào)1050、日本JIS標(biāo)準(zhǔn)鋼號(hào)S50C/S53C、國(guó)際標(biāo)準(zhǔn)化組織ISO標(biāo)準(zhǔn)鋼號(hào)C50E4。</p>
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臨界點(diǎn)溫度 （近似值） Ac1=725℃，Ac3=760℃，Ar3=721℃，Ar1=690℃</p>
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正火規(guī)范 溫度830℃±10℃，空氣冷卻。</p>
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普通淬火、回火規(guī)范 淬火溫度830℃ ±10℃，水、油冷卻；回火溫度600℃±10℃，水、油冷卻。</p>
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制造動(dòng)負(fù)載、沖擊載荷不大以及要求耐磨性好的機(jī)械零件，如鍛造齒輪、軸摩擦盤(pán)、機(jī)床主軸、發(fā)動(dòng)機(jī)主軸、軋輥、拉桿、彈簧墊圈等。</p>
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特性及應(yīng)用=未熱處理時(shí)：HB≤241；熱處理：正火；沖擊功：Aku≥31J；強(qiáng)度較高，塑性和韌性較差，切削性中等，焊接性差，水淬時(shí)有形成裂紋的傾向。一般正火，調(diào)質(zhì)狀態(tài)下使用，用作要求較高強(qiáng)度、耐磨性或彈性、動(dòng)載荷及沖擊負(fù)荷不大的零件，如齒輪、軋輥、機(jī)床主軸、連桿、次要彈簧等</p>
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