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个人中心收藏查看我的收藏0有用+10播报讨论上传视频双相不锈钢品种，双相不锈钢品种，用于炼油、化肥、造纸、石油、化工等耐海水耐高温浓硝酸等热交换器和冷淋器及器件。最后，一些网页甚至论文将双相不锈钢写作双向不锈钢是错误的。外文名
标    准GB/T 20878-2007
用    途炼油、化肥、造纸、石油等
出    处不锈钢和耐热钢牌号及化学成分

目录
1简介2化学成分3使用要点
简介
播报编辑我国新标准GB/T 20878-2007《不锈钢和耐热钢牌号及化学成分》中加入了许多双相不锈钢牌号。如：14Cr18Ni11Si4AlTi、 022Cr19Ni5Mo3Si2N、12Cr21Ni5Ti。更多的牌号见标准。另外：著名的2205双相钢相当于我国的022Cr23Ni5Mo3N.。最后，一些网页甚至论文将双相不锈钢写作双向不锈钢是错误的。双相是指金相组织的有两种，而非方向的“向”。双相不锈钢的用途用于炼油、化肥、造纸、石油、化工等耐海水耐高温浓硝酸等热交换器和冷淋器及器件。双相不锈钢的主要代表牌号DSS一般可分为四类低合金型-代表牌号：UNS S32304（23Cr-4Ni-0.1N）中合金型-代表牌号：UNS S31803（22Cr-5Ni-3Mo-0.1N）高合金型-代表牌号：UNS S32550（22Cr-6Ni-3Mo-2Cu-0.2N）超级双相不锈钢型-标准牌号：UNS （25Cr-7Ni-3.7Mo-0.3N）低合金型UNS S32304不含钼，在耐应力腐蚀方面可代替AISI304或316使用。中合金型：UNS S31803的耐蚀性能介于AISI316L和6%Mo+N奥氏体不锈钢之间。高合金型：一般含25%Cr,还含有钼和氮，有的还含铜和钨，这类钢的耐蚀性能高于22%Cr的双相不锈钢超级双相不锈钢型：含高钼和氮，有的也含钨和铜，也适用于苛刻的介质条件，具有良好的耐腐蚀与力学综合性能，可与超级奥氏体不锈钢相比美。常用双相不锈钢理化性能指标
化学成分
播报编辑1． 化学成分（%）钢号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、机械性能项目钢号σb(Mpa)≥σs(Mpa≥)δ%≥硬度-布氏洛氏----（SAF2507）00Cr25Ni7Mo4N8005501531032S3180.(SAF2507)00Cr22Ni5Mo3N6204502529030.5S31500(3RE60)00Cr18Ni5Mo3Siz6304403029030.5
使用要点
播报编辑1.需要对相比例进行控制，最合适的比例是铁素体相和奥氏体相约各占一半，其中某一相的数量最多不能超过65%，这样才能保证有最佳的综合性能。如果两相比例失调，例如铁素体相数量过多，很容易在焊接HAZ形成单相铁素体，在某些介质中对应力腐蚀破裂敏感。2.需要掌握双相不锈钢的组织转变规律，熟悉每一个钢种的TTT和CCT转变曲线，这是正确指导制定双相不锈钢热处理，热成型等工艺的关键，双相不锈钢脆性相的析出要比奥氏体不锈钢敏感的多。3.双相不锈钢的连续使用温度范围为-50～250℃，下限取决于钢的脆性转变温度，上限受到475℃脆性的限制，上限温度不能超过300℃。 [1]4.双相不锈钢固溶处理后需要快冷，缓慢冷却会引起脆性相的析出，从而导致钢的韧性，特别是耐局部腐蚀性能的下降。5.高铬钼双相不锈钢的热加工与热成型的下限温度不能低于950℃，超级双相不锈钢不能低于980℃低铬钼双相不锈钢不能低于900℃，避免因脆性相的析出在加工过程造成表面裂纹6.不能使用奥氏体不锈钢常用的650-800℃的消除应力处理，一般采用固溶退火处理。对于在低合金钢的表面堆焊双相不锈钢后，需要进行600-650℃整体消应处理时，必须考虑到因脆性相的析出所带来的韧性和耐腐蚀性，尤其是耐局部腐蚀性能的下降问题，尽可能缩短在这一温度范围内的加热时间。低合金钢和双相不锈钢复合板的热处理问题也要同此考虑。7.需要熟悉了解双相不锈钢的焊接规律，不能全部套用奥氏体不锈钢的焊接，双相不锈钢的设备能否安全使用与正确掌握钢的焊接工艺有很大关系，一些设备的失效往往与焊接有关。关键在于线能量和层间温度的控制，正确选择焊接材料也很重要。焊接接头（焊缝金属和焊接HAZ）的两相比例，尤其是焊接HAZ维持必要的奥氏体数量，这对保证焊接接头具有与母材同等的性能很重要。8.在不同的腐蚀环境中选用双相不锈钢时，要注意钢的耐腐蚀性总是相对的，尽管双相不锈钢有较好的耐局部腐蚀性能，就某一个双相不锈钢而言，他也是有一个适用的介质条件范围，包括温度、压力、介质浓度、pH值等，需要慎重加以选择。从文献和手册中获取的数据很多是实验室的腐蚀试验结果，往往与工程的实际条件有差距，因此在选材时需要注意，必要时需要进行在实际介质中的腐蚀试验或是现场条件下的挂片试验，甚至模拟装置的试验。新手上路成长任务编辑入门编辑规则本人编辑我有疑问内容质疑在线客服官方贴吧意见反馈投诉建议举报不良信息未通过词条申诉投诉侵权信息封禁查询与解封©2025 Baidu 使用百度前必读 | 百科协议 | 隐私政策 | 百度百科合作平台 | 京ICP证030173号 京公网安备11000002000001号window.PAGE_DATA= {"lemmaId":10088094,"lemmaTitle":"","lemmaDesc":"双相不锈钢品种","lemmaType":0,"uid":278439736,"uname":"用户38a79810","createTime":1320743991,"updateTime":1730303577,"isDefault":0,"isDeleted":0,"rank":1,"extData":{"audit_comment_category":2,"classify":[{"id":1033565,"idPath":"1033565/1033595/1033764","leafId":1033764,"leafName":"材料","mainCategory":1,"name":"应用科学","path":"应用科学/材料学/材料"}],"discussion":{"relateInfo":[{"relateId":32990,"relateType":1}]},"isBaikeV6":1,"isFrontV6":1,"isSapp":0,"isWaitForPersonal":false,"kpdClassify":[{"id":337502,"name":"工业产品"}],"lemmaId":6840472,"lemma_id":6840472,"naturalAdConf":{"industrial":true},"newEditor":1,"pass_count":15,"subLemmaId":6973818,"updateTime":1730303578,"wapEdit":0},"extFlag":0,"versionId":612016152,"versionUid":5351643785,"versionUname":"然然过六级","versionCreateTime":1729995153,"catalog":[{"level":1,"title":"简介","index":"1","uuid":"gnbippq768","height":28},{"level":1,"title":"化学成分","index":"2","uuid":"gnbippq78e","height":28},{"level":1,"title":"使用要点","index":"3","uuid":"gnbippqanw","height":28}],"abstract":[],"reference":[{"type":1,"title":"万方数据知识服务平台","site":"万方数据知识服务平台","refDate":"2024-10-27","index":1,"uuid":"usmLkQSo90YI","encodeUrl":"533aYdO6cr3_z3kATKLeyqr4O3zBN9Stt7eFU-ZzzqIPmGapB4qrTYk85tYx-fNmAAqFs5dvLtUb2fivSBIauq5DILEqMe1-_ByXKXOQy9ymlttH2bBE-_AnBcsU4ruI8Tmms2T0k8HVw2WRyw6emNywT3SfMt9sw6wEI5j_e4x8BAXYnEG2Xk_MH5PEquzojUqEBqk"}],"modules":{"adManager":{"data":{"discussionHelpEdit":0,"wapRelatedBusiness":1}},"discussion":{"showHelpEdit":1},"globalConfig":{"data":{"serviceAdLemmaCategory":[337597,337474]}},"paper":{"switch":false},"pinzhuan":{}},"card":{"type":243,"left":[{"key":"foreignName","title":"外文名","isArray":true,"delimiter":"","data":[{"dataType":"text","text":[{"tag":"text","text":""}]}]},{"key":"customDefault","title":"标准","isArray":false,"delimiter":"","data":[{"dataType":"enum","text":[{"tag":"text","text":"GB/T 20878-2007"}],"value":"GB/T 20878-2007"}]}],"right":[{"key":"purpose","title":"用途","isArray":false,"delimiter":"","data":[{"dataType":"text","text":[{"tag":"text","text":"炼油、化肥、造纸、石油等"}]}]},{"key":"source","title":"出处","isArray":false,"delimiter":"","data":[{"dataType":"text","text":[{"tag":"text","text":"不锈钢和耐热钢"},{"lemmaId":0,"tag":"innerlink","text":"牌号"},{"tag":"text","text":"及化学成分"}]}]}]},"lemmaCnt":1,"tips":{"isPolyseme":0},"encodeLemmaId":"5c3a2427645f0b2dca712554","versionUk":"4yYxRTHUkzSRDTSgpZGRlA","description":"，双相不锈钢品种，用于炼油、化肥、造纸、石油、化工等耐海水耐高温浓硝酸等热交换器和冷淋器及器件。最后，一些网页甚至论文将双相不锈钢写作双向不锈钢是错..."}window.__abbaidu_2020_subidgetf||(window.__abbaidu_2020_subidgetf=function(){return"01000000"}) 国内外对应牌号：S32750、S25073、UNS S32750、DIN X2CrNiMoN25-7-4、1.4410、022Cr25Ni7Mo4N   化学成分： 牌号 % Ni Cr Mo N P Mn S C Si S32750 最小 6.0 24.0 3.0 0.24           最大 8.0 26.0 5.0 0.32 0.03 1.20 0.02 0.03 0.80   机械性能： 密度 7.79 g/cm3 熔点 1396-1450℃   牌号 抗拉强度σb (Mpa) 屈服强度σ0.2 (Mpa) 延伸率A5 % 硬度 HB S32750 ≥760 ≥550 ≥25 ≤290   特性及应用： 双相不锈钢S32750合金是由25%铬,4%钼及7%镍和氮合金构成的复式不锈钢。它具有高强度、良好的冲击韧性以及良好的整体和局部的抗应力腐蚀能力。双相钢S32750中铬、钼及氮的含量使其在氧化性及酸性的溶液中, 对点腐蚀及隙腐蚀具有很强的抵抗能力。不锈钢的双相微观结构有助于提高不锈钢的抗应力腐蚀龟裂能力。在一定的温度、应张力、氧气及氯化物存在的情况下,奥氏体不锈钢会发生氯化物应力腐蚀。由于其较高的合金含量，S32750的抗腐蚀能力及强度均优于2205   应用领域： 用于制造压力器皿、高压储藏罐、高压管道、热交换器（化学加工工业），用于制造石油天燃气管道、热交换器管件，污水处理系统，纸浆和造纸工业分类器、漂白设备、贮存处理系统，高强度耐腐蚀环境下的回转轴、压榨辊、叶片、叶轮等，轮船和卡车的货物箱，食品加工设备，能源工业FGD系统、工业洗刷系统、吸收塔。