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S32750特殊不銹鋼-雙相不銹鋼卷板
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[1]。該材料通過高鉬和氮含量提升耐蝕性，PREN值≥40，具備優(yōu)異的抗氯化物點(diǎn)蝕、縫隙腐蝕及應(yīng)力腐蝕開裂能力，適用于海水淡化、石油化工等腐蝕性環(huán)境 [2]。S32750機(jī)械性能突出，抗拉強(qiáng)度≥730-800MPa，屈服強(qiáng)度≥550MPa，延伸率≥15%-20%，密度約8.03g/cm3。連續(xù)工作溫度范圍為-50℃至250℃，加工需在980℃以上進(jìn)行并快速冷卻固溶處理，避免σ相等脆性相析出 [1]。主要應(yīng)用于煉油設(shè)備、熱交換器、海洋平臺(tái)管道系統(tǒng)及煙氣脫硫裝置，制造工藝涉及真空熔煉、電渣重熔等技術(shù) [2-3]。焊接需精確控制線能量與層間溫度，熱處理溫度上限為570℃ [4]。外文名S32750標(biāo) 準(zhǔn)GB/T 20878-2007用 途煉油、化肥、造紙、石油等出 處不銹鋼和耐熱鋼牌號(hào)及化學(xué)成分目錄1S32750簡(jiǎn)介2化學(xué)成分3使用要點(diǎn)S32750簡(jiǎn)介播報(bào)編輯我國(guó)新標(biāo)準(zhǔn)GB/T 20878-2007《不銹鋼和耐熱鋼牌號(hào)及化學(xué)成分》中加入了許多雙相不銹鋼牌號(hào)。如：14Cr18Ni11Si4AlTi、 022Cr19Ni5Mo3Si2N、12Cr21Ni5Ti。更多的牌號(hào)見標(biāo)準(zhǔn)。另外：著名的2205雙相鋼相當(dāng)于我國(guó)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(cuò)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(hào)DSS一般可分為四類低合金型-代表牌號(hào)：UNS S32304（23Cr-4Ni-0.1N）中合金型-代表牌號(hào)：UNS S31803（22Cr-5Ni-3Mo-0.1N）高合金型-代表牌號(hào)：UNS S32550（22Cr-6Ni-3Mo-2Cu-0.2N）超級(jí)雙相不銹鋼型-標(biāo)準(zhǔn)牌號(hào)：UNS S32750（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(jí)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(jí)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(hào)C≤Mn≤Si≤S≤P≤Cr≤NiMoCu≤NS32750（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(hào)σb(Mpa)≥σs(Mpa≥)δ%≥硬度-布氏洛氏----S32750（SAF2507）00Cr25Ni7Mo4N8005501531032S3180.(SAF2507)00Cr22Ni5Mo3N6204502529030.5S31500(3RE60)00Cr18Ni5Mo3Siz6304403029030.5使用要點(diǎn)播報(bào)編輯1.需要對(duì)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(duì)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(gè)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(huì)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(jí)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(duì)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(duì)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(duì)的，盡管雙相不銹鋼有較好的耐局部腐蝕性能，就某一個(gè)雙相不銹鋼而言，他也是有一個(gè)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(cè)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(chǎng)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(zhǎng)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(tái)?|?京ICP證030173號(hào)?京公網(wǎng)安備11000002000001號(hào)window.PAGE_DATA= 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由于該鋼鉻和鉬的含量都很高,因此具有很好的抗點(diǎn)腐蝕,縫隙腐蝕和均勻腐蝕的能力.雙相顯微組織保證了該鋼具有很高的抗應(yīng)力腐蝕破裂的能力,而且機(jī)械強(qiáng)度也很高.S32750應(yīng)用領(lǐng)域應(yīng)用于石油和天然氣工業(yè);海上石破天油平臺(tái)(熱交換器管,水處理和供水系統(tǒng),消防系統(tǒng),噴水系統(tǒng),穩(wěn)水系統(tǒng); 石油化工設(shè)備; 脫鹽(淡化)設(shè)備(和設(shè)備中的高壓管,海水管);既需要高強(qiáng)度同時(shí)又需要高耐腐蝕性的機(jī)械和結(jié)構(gòu)部件;燃(廢)氣凈化設(shè)備。是雙相不銹鋼中耐局部腐蝕很好的鋼，特點(diǎn)是耐點(diǎn)蝕很好，并具有高強(qiáng)度、耐氯化物應(yīng)力腐蝕、可焊接的特點(diǎn)。非常適用于化工、石油、石化和動(dòng)力工業(yè)中以河水、地下水和海水等為冷卻介質(zhì)的換熱設(shè)備。耐腐蝕性及主要使用環(huán)境S32750雙相鋼的較高的鉻及鉬含量使其對(duì)有機(jī)酸如甲酸、乙酸等具有較強(qiáng)的抗整體腐蝕的能力。S32750雙相鋼對(duì)無機(jī)酸尤其是那些包含氯化物的無機(jī)酸也具有較強(qiáng)的抗腐蝕能力。和904L相比，S32750雙相鋼對(duì)稀釋的混有氯離子的硫酸具有更強(qiáng)的抗腐蝕能力。904L是奧氏體狀態(tài)的合金，專用于抗純硫酸腐蝕。316L不能用于鹽酸環(huán)境中，它可能會(huì)遭到局部腐蝕或整體腐蝕。S32750雙相鋼用于稀釋的鹽酸環(huán)境里，具有較強(qiáng)的抗點(diǎn)腐蝕及抗隙腐蝕能力。 PRODUCT PARAMETERS 產(chǎn)品參數(shù) 化學(xué)成分%CSiMnPSCrNiMoNCuMin24.06.03.00.24Max0.030.81.20.0350.0226.08.05.00.320.5物理性能：2507雙相鋼密度：8.03g/cm3， 熔點(diǎn)：1300-1390 ℃，磁性：無 熱處理：1000-1052℃之間保溫1-2小時(shí)，快速空冷或水冷。 機(jī)械性能：抗拉強(qiáng)度：σb≥795Mpa，屈服強(qiáng)度σb≥550Mpa：延伸率：δ≥15%，硬度≤310（HB） 上一頁：2507
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