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50#碳素鋼特種鋼板-碳素鋼/模具鋼系列
專業(yè)為您提供碳素鋼/模具鋼系列牌號，材質(zhì)單，在線報價單 歡迎選購
50（美國國防部指代朝鮮半島的作戰(zhàn)暗號）_百度百科 .rc-dialog{margin:10px;position:relative;width:auto}.rc-dialog-wrap{-webkit-overflow-scrolling:touch;bottom:0;left:0;outline:0;overflow:auto;position:fixed;right:0;top:0;z-index:1050}.rc-dialog-title{font-size:14px;font-weight:700;line-height:21px;margin:0}.rc-dialog-content{background-clip:padding-box;background-color:#fff;border:none;border-radius:6px 6px;position:relative}.rc-dialog-close{background:transparent;border:0;color:#000;cursor:pointer;filter:alpha(opacity=20);font-size:21px;font-weight:700;line-height:1;opacity:.2;position:absolute;right:20px;-webkit-text-decoration:none;text-decoration:none;text-shadow:0 1px 0 #fff;top:12px}.rc-dialog-close-x:after{content:"×"}.rc-dialog-close:hover{filter:alpha(opacity=100);opacity:1;-webkit-text-decoration:none;text-decoration:none}.rc-dialog-header{background:#fff;border-bottom:1px solid #e9e9e9;border-radius:5px 5px 0 0;color:#666;padding:13px 20px 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[3-5]。相關(guān)計劃涉及遠程遙控飛行技術(shù)應(yīng)用推測 [2]，實際運用可追溯至2009年韓美聯(lián)合軍演 [3]。應(yīng)用場景朝鮮半島突發(fā)事態(tài) [1] [4-5]關(guān)聯(lián)計劃5026/5027/5029/5030系列 [4]制定機構(gòu)美國國防部 [4]啟用時間至少自1997年起 [5]技術(shù)關(guān)聯(lián)波音757/767遠程操控系統(tǒng)（"環(huán)球之鷹"遙控飛行技術(shù)） [2]目錄1編號體系背景2核心作戰(zhàn)計劃3技術(shù)應(yīng)用推測4實際運用案例編號體系背景播報編輯前兩位數(shù)字'50'自1997年起被美國國防部確立為朝鮮半島專屬作戰(zhàn)暗號，后兩位數(shù)字則代表具體行動類型 [5]。美國國防部針對朝鮮半島制定了一系列以'50'打頭的作戰(zhàn)計劃，如5026、5027、5029和5030等。該體系下超過20個作戰(zhàn)計劃由美國太平洋司令部統(tǒng)籌制定，其中包括以'50'打頭的多個計劃，如5026、5027、5029和5030等 [4]。核心作戰(zhàn)計劃播報編輯5027作戰(zhàn)計劃：作為韓美聯(lián)合司令部最主要的作戰(zhàn)方案，最新版本（截至2009年）設(shè)想朝鮮發(fā)動閃電戰(zhàn)場景，包含核保護傘部署、美軍快速增援等應(yīng)對措施 [3-4]。5029概念計劃：2023年版本針對五類突發(fā)事態(tài)制定預(yù)案：1.朝鮮政權(quán)交替引發(fā)內(nèi)戰(zhàn)2.大規(guī)模殺傷性武器失控3.居民大規(guī)模外逃4.自然災(zāi)害引發(fā)人道危機5.韓國公民被劫持事件 [1]技術(shù)應(yīng)用推測播報編輯截至2025年，"50"暗號體系可能與"環(huán)球之鷹"遙控飛行技術(shù)存在關(guān)聯(lián)。該技術(shù)由雷神公司與史坦利·霍爾博士研發(fā)，可在劫機時通過地面控制中心接管波音757/767客機 [2]。實際運用案例播報編輯在2009年8月舉行的韓美聯(lián)合軍演中：首次采用以"50"暗號標識的新作戰(zhàn)草案演練2012年戰(zhàn)時指揮權(quán)移交流程 [3]新手上路成長任務(wù)編輯入門編輯規(guī)則本人編輯我有疑問內(nèi)容質(zhì)疑在線客服官方貼吧意見反饋投訴建議舉報不良信息未通過詞條申訴投訴侵權(quán)信息封禁查詢與解封?2025?Baidu?使用百度前必讀?|?百科協(xié)議?|?隱私政策?|?百度百科合作平臺?|?京ICP證030173號?京公網(wǎng)安備11000002000001號window.PAGE_DATA= 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中碳高強度碳素結(jié)構(gòu)鋼，淬火后具有高的強度和硬度，該鋼可切削性中等，冷變形塑性低，焊接性差，熱處理時無回火脆性，但淬透性較低，水中臨界直徑為13*30mm，且水淬時有開裂傾向。此鋼通常在正火或淬火回火，或高頻表面淬火等熱處理后使用。50號鋼可以淬硬至HRC42~46。所以如果需要表面硬度，又希望發(fā)揮50號鋼優(yōu)越的機械性能，常將50號鋼表面滲碳淬火，這樣就能得到需要的表面硬度。交貨狀態(tài)鋼板以熱處理（正火、回火、正火+回火、退火）狀態(tài)交貨。熱處理類別應(yīng)在。材料名稱：50統(tǒng)一數(shù)字代號：U20502執(zhí)行標準GB/T 699-1988 機械加工：(一)軸類零件的毛坯 軸類零件可根據(jù)使用要求、生產(chǎn)類型、設(shè)備條件及結(jié)構(gòu)，選用棒料、鍛件等毛坯形式。對于外圓直徑相差不大的軸，一般以棒料為主；而對于外圓直徑相差大的階梯軸或重要的軸，常選用鍛件，這樣既節(jié)約材料又減少機械加工的工作量，還可改善機械性能。 根據(jù)生產(chǎn)規(guī)模的不同，毛坯的鍛造方式有自由鍛和模鍛兩種。中小批生產(chǎn)多采用自由鍛，大批大量生產(chǎn)時采用模鍛。 (二)軸類零件的材料 軸類零件應(yīng)根據(jù)不同的工作條件和使用要求選用不同的材料并采用不同的熱處理規(guī)范（如調(diào)質(zhì)、正火、淬火等），以獲得一定的強度、韌性和耐磨性。 50鋼是軸類零件的常用材料，它價格便宜經(jīng)過調(diào)質(zhì)（或正火）后，可得到較好的切削性能，而且能獲得較高的強度和韌性等綜合機械性能，淬火后表面硬度可達45～52HRC。未淬火表面硬度為28-32HRC 40Cr等合金結(jié)構(gòu)鋼適用于中等精度而轉(zhuǎn)速較高的軸類零件，這類鋼經(jīng)調(diào)質(zhì)和淬火后，具有較好的綜合機械性能。 軸承鋼GCr15和彈簧鋼65Mn，經(jīng)調(diào)質(zhì)和表面高頻淬火后，表面硬度可達50～58HRC，并具有較高的耐疲勞性能和較好的耐磨性能，可制造較高精度的軸。 精密機床的主軸（例如磨床砂輪軸、坐標鏜床主軸）可選用38CrMoAIA氮化鋼。這種鋼經(jīng)調(diào)質(zhì)和表面氮化后，不僅能獲得很高的表面硬度，而且能保持較軟的芯部，因此耐沖擊韌性好。與滲碳淬火鋼比較，它有熱處理變形很小，硬度更高的特性。 50號鋼廣泛用于機械制造，這種鋼的機械性能很好。但是這是一種中碳鋼，淬火性能并不好， 50號鋼可以淬硬至HRC42~46。所以如果需要表面硬度，又希望發(fā)揮50號鋼優(yōu)越的機械性能，常將50號鋼表面滲碳淬火，這樣就能得到需要的表面硬度。特性中碳高強度碳素結(jié)構(gòu)鋼，淬火后具有高的強度和硬度，該鋼可切削性中等，冷變形塑性低，焊接性差，熱處理時無回火脆性，但淬透性較低，水中臨界直徑為13*30mm，且水淬時有開裂傾向。此鋼通常在正火或淬火回火，或高頻表面淬火等熱處理后使用?；瘜W(xué)成分（質(zhì)量分數(shù)，%）C 0.47~0.55、Si 0.17~0.37、Mn 0.50~0.80、P≤0.035、S≤0.035、Ni≤0.30、Cr≤0.15、Cu≤0.25、 [1] 力學(xué)性能抗拉強度 σb (MPa)：≥630(64)屈服強度 σs (MPa)：≥375(38)伸長率 δ5 (%)：≥14斷面收縮率 ψ (%)：≥40沖擊功 Akv (J)：≥31(4)沖擊韌性值 αkv (J/cm²)：≥39(4)硬度 ：未熱處理，≤241HB;退火鋼，≤207HB試樣尺寸：試樣尺寸為25mm.參考對應(yīng)鋼號 德國DIN標準材料編號1.1213、德國DIN標準鋼號Cf53、我國GB的標準鋼號是50、英國BS標準鋼號060A52、法國AFNOR標準鋼號XC48TS、法國NF標準鋼號C50、意大利UNI標準鋼號C53、比利時NBN標準鋼號C53、瑞典SS標準鋼號1674、美國AISI/SAE/ASTM標準鋼號1050、日本JIS標準鋼號S50C/S53C、國際標準化組織ISO標準鋼號C50E4。臨界點溫度 （近似值） Ac1=725℃，Ac3=760℃，Ar3=721℃，Ar1=690℃正火規(guī)范 溫度830℃±10℃，空氣冷卻。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。適用于制造動負載、沖擊載荷不大以及要求耐磨性好的機械零件，如鍛造齒輪、軸摩擦盤、機床主軸、發(fā)動機主軸、軋輥、拉桿、彈簧墊圈等。特性及應(yīng)用=未熱處理時：HB≤241；熱處理：正火；沖擊功：Aku≥31J；強度較高，塑性和韌性較差，切削性中等，焊接性差，水淬時有形成裂紋的傾向。一般正火，調(diào)質(zhì)狀態(tài)下使用，用作要求較高強度、耐磨性或彈性、動載荷及沖擊負荷不大的零件，如齒輪、軋輥、機床主軸、連桿、次要彈簧等典型應(yīng)用用于制造一般沖頭時，批量小于1000件，被沖材料為軟態(tài)低碳鋼板，料厚δ<1mm，所以使用凹模為鋅基合金。適用于制造耐磨性要求較高，動載荷及沖擊作用較大的模具零件。
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