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S32750特殊不銹鋼-雙相不銹鋼卷板
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處不銹鋼和耐熱鋼牌號及化學(xué)成分目錄1簡介2化學(xué)成分3使用要點(diǎn)簡介播報(bào)編輯我國新標(biāo)準(zhǔn)GB/T 20878-2007《不銹鋼和耐熱鋼牌號及化學(xué)成分》中加入了許多雙相不銹鋼牌號。如：14Cr18Ni11Si4AlTi、 022Cr19Ni5Mo3Si2N、12Cr21Ni5Ti。更多的牌號見標(biāo)準(zhǔn)。另外：著名的2205雙相鋼相當(dāng)于我國的022Cr23Ni5Mo3N.。最后，一些網(wǎng)頁甚至論文將雙相不銹鋼寫作雙向不銹鋼是錯誤的。雙相是指金相組織的有兩種，而非方向的“向”。雙相不銹鋼的用途用于煉油、化肥、造紙、石油、化工等耐海水耐高溫濃硝酸等熱交換器和冷淋器及器件。雙相不銹鋼的主要代表牌號DSS一般可分為四類低合金型-代表牌號：UNS S32304（23Cr-4Ni-0.1N）中合金型-代表牌號：UNS S31803（22Cr-5Ni-3Mo-0.1N）高合金型-代表牌號：UNS S32550（22Cr-6Ni-3Mo-2Cu-0.2N）超級雙相不銹鋼型-標(biāo)準(zhǔn)牌號：UNS （25Cr-7Ni-3.7Mo-0.3N）低合金型UNS S32304不含鉬，在耐應(yīng)力腐蝕方面可代替AISI304或316使用。中合金型：UNS S31803的耐蝕性能介于AISI316L和6%Mo+N奧氏體不銹鋼之間。高合金型：一般含25%Cr,還含有鉬和氮，有的還含銅和鎢，這類鋼的耐蝕性能高于22%Cr的雙相不銹鋼超級雙相不銹鋼型：含高鉬和氮，有的也含鎢和銅，也適用于苛刻的介質(zhì)條件，具有良好的耐腐蝕與力學(xué)綜合性能，可與超級奧氏體不銹鋼相比美。常用雙相不銹鋼理化性能指標(biāo)化學(xué)成分播報(bào)編輯1． 化學(xué)成分（%）鋼號C≤Mn≤Si≤S≤P≤Cr≤NiMoCu≤N（SAF2507）00Cr25Ni7Mo4N0.031.200.80.0200.03524.0/26.06.0/8.03.0/5.00.500.24/0.32S3180.(SAF2507)00Cr22Ni5Mo3N0.032.001.00.0200.03021.0/23.04.50/6.502.50/3.50-0.08/0.20S31500(3RE60)00Cr18Ni5Mo3Siz0.031.2/2.001.4/2.000.0300.03018.0/19.04.25/5.252.50/3.00-0.05/0.102、機(jī)械性能項(xiàng)目鋼號σb(Mpa)≥σs(Mpa≥)δ%≥硬度-布氏洛氏----（SAF2507）00Cr25Ni7Mo4N8005501531032S3180.(SAF2507)00Cr22Ni5Mo3N6204502529030.5S31500(3RE60)00Cr18Ni5Mo3Siz6304403029030.5使用要點(diǎn)播報(bào)編輯1.需要對相比例進(jìn)行控制，最合適的比例是鐵素體相和奧氏體相約各占一半，其中某一相的數(shù)量最多不能超過65%，這樣才能保證有最佳的綜合性能。如果兩相比例失調(diào)，例如鐵素體相數(shù)量過多，很容易在焊接HAZ形成單相鐵素體，在某些介質(zhì)中對應(yīng)力腐蝕破裂敏感。2.需要掌握雙相不銹鋼的組織轉(zhuǎn)變規(guī)律，熟悉每一個鋼種的TTT和CCT轉(zhuǎn)變曲線，這是正確指導(dǎo)制定雙相不銹鋼熱處理，熱成型等工藝的關(guān)鍵，雙相不銹鋼脆性相的析出要比奧氏體不銹鋼敏感的多。3.雙相不銹鋼的連續(xù)使用溫度范圍為-50～250℃，下限取決于鋼的脆性轉(zhuǎn)變溫度，上限受到475℃脆性的限制，上限溫度不能超過300℃。 [1]4.雙相不銹鋼固溶處理后需要快冷，緩慢冷卻會引起脆性相的析出，從而導(dǎo)致鋼的韌性，特別是耐局部腐蝕性能的下降。5.高鉻鉬雙相不銹鋼的熱加工與熱成型的下限溫度不能低于950℃，超級雙相不銹鋼不能低于980℃低鉻鉬雙相不銹鋼不能低于900℃，避免因脆性相的析出在加工過程造成表面裂紋6.不能使用奧氏體不銹鋼常用的650-800℃的消除應(yīng)力處理，一般采用固溶退火處理。對于在低合金鋼的表面堆焊雙相不銹鋼后，需要進(jìn)行600-650℃整體消應(yīng)處理時(shí)，必須考慮到因脆性相的析出所帶來的韌性和耐腐蝕性，尤其是耐局部腐蝕性能的下降問題，盡可能縮短在這一溫度范圍內(nèi)的加熱時(shí)間。低合金鋼和雙相不銹鋼復(fù)合板的熱處理問題也要同此考慮。7.需要熟悉了解雙相不銹鋼的焊接規(guī)律，不能全部套用奧氏體不銹鋼的焊接，雙相不銹鋼的設(shè)備能否安全使用與正確掌握鋼的焊接工藝有很大關(guān)系，一些設(shè)備的失效往往與焊接有關(guān)。關(guān)鍵在于線能量和層間溫度的控制，正確選擇焊接材料也很重要。焊接接頭（焊縫金屬和焊接HAZ）的兩相比例，尤其是焊接HAZ維持必要的奧氏體數(shù)量，這對保證焊接接頭具有與母材同等的性能很重要。8.在不同的腐蝕環(huán)境中選用雙相不銹鋼時(shí)，要注意鋼的耐腐蝕性總是相對的，盡管雙相不銹鋼有較好的耐局部腐蝕性能，就某一個雙相不銹鋼而言，他也是有一個適用的介質(zhì)條件范圍，包括溫度、壓力、介質(zhì)濃度、pH值等，需要慎重加以選擇。從文獻(xiàn)和手冊中獲取的數(shù)據(jù)很多是實(shí)驗(yàn)室的腐蝕試驗(yàn)結(jié)果，往往與工程的實(shí)際條件有差距，因此在選材時(shí)需要注意，必要時(shí)需要進(jìn)行在實(shí)際介質(zhì)中的腐蝕試驗(yàn)或是現(xiàn)場條件下的掛片試驗(yàn)，甚至模擬裝置的試驗(yàn)。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?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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(Mpa) 延伸率A5 % 硬度 HB S32750 ≥760 ≥550 ≥25 ≤290 特性及應(yīng)用： 雙相不銹鋼S32750合金是由25%鉻,4%鉬及7%鎳和氮合金構(gòu)成的復(fù)式不銹鋼。它具有高強(qiáng)度、良好的沖擊韌性以及良好的整體和局部的抗應(yīng)力腐蝕能力。雙相鋼S32750中鉻、鉬及氮的含量使其在氧化性及酸性的溶液中, 對點(diǎn)腐蝕及隙腐蝕具有很強(qiáng)的抵抗能力。不銹鋼的雙相微觀結(jié)構(gòu)有助于提高不銹鋼的抗應(yīng)力腐蝕龜裂能力。在一定的溫度、應(yīng)張力、氧氣及氯化物存在的情況下,奧氏體不銹鋼會發(fā)生氯化物應(yīng)力腐蝕。由于其較高的合金含量，S32750的抗腐蝕能力及強(qiáng)度均優(yōu)于2205 應(yīng)用領(lǐng)域： 用于制造壓力器皿、高壓儲藏罐、高壓管道、熱交換器（化學(xué)加工工業(yè)），用于制造石油天燃?xì)夤艿馈峤粨Q器管件，污水處理系統(tǒng)，紙漿和造紙工業(yè)分類器、漂白設(shè)備、貯存處理系統(tǒng)，高強(qiáng)度耐腐蝕環(huán)境下的回轉(zhuǎn)軸、壓榨輥、葉片、葉輪等，輪船和卡車的貨物箱，食品加工設(shè)備，能源工業(yè)FGD系統(tǒng)、工業(yè)洗刷系統(tǒng)、吸收塔。
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