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444特殊不銹鋼-鐵素體不銹鐵400系列
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.index-module_taskLogo__71Tj5{height:66px;position:absolute;right:30px;top:0;width:66px}.index-module_drawerHand__aRhcO.index-module_open__qMl5O{right:480px}.index-module_reverse__OKr6k{transform:rotate(180deg)}網(wǎng)頁新聞貼吧知道網(wǎng)盤圖片視頻地圖文庫資訊采購百科百度首頁登錄注冊進(jìn)入詞條全站搜索幫助首頁秒懂百科特色百科知識專題加入百科百科團(tuán)隊(duì)權(quán)威合作個(gè)人中心收藏查看我的收藏0有用+10444播報(bào)討論上傳視頻自然數(shù)444（四百四十四）是介于443與445之間的自然數(shù)、偶數(shù)、合數(shù)。444是可以從加法里算出來，也可以從乘法里乘出來等等。中文名444外文名Four hundred and forty-four大 寫肆佰肆拾肆分解式因數(shù)22×3×37羅馬數(shù)字CDXLIV二進(jìn)制110111100四進(jìn)制12330八進(jìn)制674十二進(jìn)制310十六進(jìn)制1BC倒數(shù)循環(huán)節(jié)3位目錄1在數(shù)字中2數(shù)學(xué)3畜牧4佛教5化學(xué)6發(fā)展歷史7文學(xué)8地理位置9工匠10測量11法律12地理環(huán)境在數(shù)字中播報(bào)編輯合數(shù)，正約數(shù)有1、2、3、4、6、12、37、74、111、148、222和444。過剩數(shù)，真約數(shù)和為620，盈度為176。半完全數(shù)，和為本身的其中一組約數(shù)為37、74、111、222。半完全數(shù)：74+148+222=444。不尋常數(shù)，大于平方根的素因數(shù)為37。十進(jìn)制的哈沙德數(shù)。十進(jìn)制的奢侈數(shù)。第54個(gè)回文數(shù)4442+1=197137可以組成一個(gè) n2+1形態(tài)的素?cái)?shù)過剩數(shù)（盈數(shù)）該數(shù)除了本身之外，其它約數(shù)的和為620＞444。是第四個(gè)欒數(shù),次列數(shù)為3,位顯數(shù)為4.數(shù)學(xué)播報(bào)編輯平方數(shù)猜想可以證明,用同一個(gè)數(shù)字1,2,3,...,9組成的十進(jìn)制數(shù),只有1,4,9是完全平方數(shù),換句話說,在11,111,1111,...;22,222,2222,...;99,999,9999,...;中沒有完全平方數(shù).方法如下：因?yàn)橥耆椒綌?shù)的個(gè)位只能是0，1，4，5，6，9，由此可推出22，222，……，33，333，……，77，777……，88，888……不是完全平方數(shù)。因?yàn)橥耆椒綌?shù)的個(gè)位是奇數(shù)時(shí)，十位必是偶數(shù)，所以11，111，……，55，555……，99，999……不是完全平方數(shù)。完全平方數(shù)的個(gè)位是偶數(shù)時(shí)，十位必是奇數(shù)，所以66，666，……不是完全平方數(shù)。只剩下44，444，……需要證明了。因?yàn)?44……4=4×111……1，4是完全平方數(shù)，所以若111……1是完全平方數(shù)，則444……4也是完全平方數(shù)，而前面已經(jīng)證明了，111……1不是完全平方數(shù)，所以444……4 也不是完全平方數(shù)。由此可知,除了1,4,9之外,一個(gè)完全平方數(shù)至少是由兩個(gè)不同的數(shù)字組成的畜牧播報(bào)編輯星雜444,是加拿大雪佛公司育成的三系配套雜交雞。據(jù)雪佛公司的資料，其72周齡產(chǎn)蛋量265-280 個(gè)，平均蛋重61-63 克，每千克蛋耗料2.45-2.7 千克。據(jù)1988-1989 年德國隨機(jī)抽樣測定結(jié)果,其生產(chǎn)性能為：500 日齡入舍雞產(chǎn)蛋量276-279 個(gè)，平均蛋重63.2-64.6克，總蛋重17.66-17.8 千克，每千克蛋耗料2.52-2.53 千克；產(chǎn)蛋期存活率91.3-92.7%。 [1]佛教播報(bào)編輯古代著名的僧侶慧深,為了尋找一方凈土，弘揚(yáng)佛法,在公元444年前后踏上了東行弘法之路，比唐僧玄奘貞觀元年（627年）西行求法早了近200年，比鑒真唐天寶二年（743年）東渡日本早了近300年。化學(xué)播報(bào)編輯純粹的單質(zhì)硫，密度1.96克/厘米3，熔點(diǎn)120.0℃，沸點(diǎn)444℃。導(dǎo)熱性和導(dǎo)電性都差。性松脆，不溶于水。無定形硫主要有彈性硫，是由熔態(tài)硫迅速傾倒在冰水中所得。不穩(wěn)定，可轉(zhuǎn)變?yōu)榫盍颉＞盍蚰苋苡谟袡C(jī)溶劑如二硫化碳中，而彈性硫只能部分溶解發(fā)展歷史播報(bào)編輯《百家姓》成書于北宋初年，原收集中文姓氏411個(gè)，后增補(bǔ)到504個(gè)，其中單姓444個(gè)，復(fù)姓60個(gè)?！栋偌倚铡纷x來順口，易學(xué)好記?！栋偌倚铡凡⒉灰勒崭餍帐系娜丝跀?shù)量排序，“趙錢孫李”成為《百家姓》前四姓是因?yàn)榘偌倚招纬捎谒未鷧窃藉X塘地區(qū)，故而宋朝皇帝趙氏、吳越國國王錢氏、吳越國王錢俶正妃孫氏以及南唐國王李氏成為百家姓前四位。另有作為兒童讀物的同名圖書。文學(xué)播報(bào)編輯《世說新語》成書于444年，是我國南朝宋時(shí)期（420-581年）產(chǎn)生的一部主要記述魏晉人物言談軼事的筆記小說。是由南朝劉宋宗室臨川王劉義慶（403-444年）組織一批文人編寫的，梁代劉峻作注。地理位置播報(bào)編輯黃石國家礦山公園位于湖北省黃石市鐵山區(qū)境內(nèi)。著名的漢冶萍煤鐵公司的“冶”即指大冶鐵礦，歷經(jīng)百年開采，大冶鐵礦東露天采場形成了落差444米的世界第一高陡邊坡。2010年2月22日黃石國家礦山公園被評為國家AAAA級景區(qū)。 [3]工匠播報(bào)編輯魯班是我國古代優(yōu)秀的土木建筑工匠之一，也是一個(gè)相傳有許多創(chuàng)造的杰出發(fā)明家。二千多年以來，一直被土木工匠尊奉為“祖師”，受到人們的尊敬和紀(jì)念。 最后死于公元前444年。測量播報(bào)編輯4開紙的尺寸是： 正度389*546 大度 444*597法律播報(bào)編輯第444號國務(wù)院令，公布的《禁止傳銷條例》中定義了什么是傳銷：2009年2月28日，第十一屆全國人民代表大會(huì)常務(wù)委員會(huì)第七次會(huì)議通過了《中華人民共和國刑法修正案(七)》，修正案中新增了“組織領(lǐng)導(dǎo)傳銷罪”，規(guī)定：組織、領(lǐng)導(dǎo)以推銷商品、提供服務(wù)等經(jīng)營活動(dòng)為名，要求參加者以繳納費(fèi)用或者購買商品、服務(wù)等方式獲得加入資格，并按照一定順序組成層級，直接或者間接以發(fā)展人員的數(shù)量作為計(jì)酬或者返利依據(jù)，引誘、脅迫參加者繼續(xù)發(fā)展他人參加，騙取財(cái)物，擾亂經(jīng)濟(jì)社會(huì)秩序的傳銷活動(dòng)的，處五年以下有期徒刑或者拘役，并處罰金；情節(jié)嚴(yán)重的，處五年以上有期徒刑，并處罰金。地理環(huán)境播報(bào)編輯神木縣高家堡古鎮(zhèn)是榆林市歷史文化名鎮(zhèn)，位于神、榆、佳三縣區(qū)交接處的禿尾河流域，神佳公路和榆神公路的交匯處，也是周邊地區(qū)重要的經(jīng)濟(jì)文化交流中心。全鎮(zhèn)東西寬27.5公里，南北長23.5公里，總面積444平方公里，地形圖像一只飛翔的和平鴿。 [2]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(bào)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?2024?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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444 444不銹鋼是一種超低碳氮、含18%鉻與2%鉬、高耐蝕的鐵素體不銹鋼。 該鋼種一般采用鈮或鈦進(jìn)行穩(wěn)定化，可以避免焊接后的晶間腐蝕。該鋼種特別適合應(yīng)用于各種水處理裝置。 444的屈服強(qiáng)度相當(dāng)于碳素鋼的1.5倍，玻璃鋼的6倍，對于耐震，耐積雪，耐風(fēng)壓，耐沖擊等具有出類拔萃的優(yōu)良性。 444鐵素體不銹鋼導(dǎo)熱系數(shù)高，約為鉻鎳奧氏體不銹鋼的130%～150%,非常適合熱交換的用途．熱膨脹系數(shù)小，小分隊(duì)僅為鉻鎳奧運(yùn)氏體不銹鋼的60%～70%,非常適合熱漲，冷縮，有熱循環(huán)的條件下使用．該鋼種的塑性，韌性較好，適于拉伸，軋制成型和沖壓制造．特別是耐應(yīng)用腐蝕是最優(yōu)異的，在高的氯化物介質(zhì)中耐蝕性能優(yōu)于普通鐵素體不銹鋼和奧運(yùn)會(huì)氏體不銹鋼，一般不產(chǎn)生氯化物的應(yīng)力腐蝕破裂．在加入Ti,Mo等元后，提高了耐孔蝕和縫隙腐蝕的性能．該鋼種可采用焊接普通不銹鋼的方法焊接．該鋼種特別適合于食品加工設(shè)備，熱交換器,熱水器罐,蓄水槽,太陽能收集面板等. 444鋼種屬于高合金鐵素體不銹鋼，與常用鋼種SUS430相比：1. 含鉻量高1.0%左右，且添加了合金元素鉬（Mo），因此該鋼種具有良好的耐點(diǎn)蝕、縫隙腐蝕、應(yīng)力腐蝕能力，其耐蝕能力在某些領(lǐng)域甚至優(yōu)于SUS304和SUS316。2. 添加了鈦（Ti），鈮（Nb），鋯（Zr）等穩(wěn)定化元素，因此該鋼種具有良好的耐晶間腐蝕和耐高溫氧化性能。 PRODUCT PARAMETERS 產(chǎn)品參數(shù) 化學(xué)成分 成分 C Si Mn P S Ni Cr N Mo Ti Nb 最小值 - - - - - - 17.5 - 1.75 - - 最大值 0.025 1 1 0.04 0.03 1 19.5 0.035 2.5 0.8 0.8
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