共查询到20条相似文献,搜索用时 78 毫秒
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本文综述了双相不锈钢的开发和应用现状。介绍了新发展的含氮双相不锈钢和粉末冶金双相不锈钢,还叙述了双相不锈钢在改善热加工性方面,以及晶粒细化和超塑性化等方面的概况。 相似文献
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The equilibrium conditions of four duplex stainless steels; Fe‐23Cr‐4.5Ni‐0.1N, Fe‐22Cr‐5.5Ni‐3Mo‐0.17N, Fe‐25Cr‐7Ni‐4Mo‐0.27N and Fe‐25Cr‐7Ni‐4Mo‐1W‐1.5Cu‐0.27N were studied in the temperature region from 700 to 1000 °C. Phase compositions were determined with SEM EDS and the phase fractions using image analysis on backscattered SEM images. The results showed that below 1000 °C the steels develop an inverse duplex structure with austenite and sigma phase, of which the former is the matrix phase. With decreasing temperature, the microstructure will be more and more complex and finely dispersed. The ferrite is, for the higher alloyed steels, only stable above 1000 °C and at lower temperatures disappears in favour of intermetallic phases. The major intermetallic phase is sigma phase with small amounts of chi phase, the latter primarily in high Mo and W grades. Nitrides, not a focus in this investigation, were present as rounded particles and acicular precipitates at lower temperatures. The results were compared to theoretical predictions using the TCFE5 and TCFE6 databases. 相似文献
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太钢采用铁水预处理+30 t电弧炉熔化合金钢水-75 t K-OBM-S吹炼-VOD处理-LF精炼-5.6 t铸锭开坯(或220 mm×220 mm铸坯)-Φ100 mm管坯穿孔-冷轧(冷拔)流程,生产了Φ38 mm×6.6 mm TP347H (1Cr19Ni11Nb)钢无缝管。结果表明,通过控制[O]≤30×10-6、[H]≤3×10-6、As≤0.003 0%、Pb、Sn、Sb、Bi分别≤0.001 0%以及钢中C含量0.06%~0.08%、Nb含量0.6%-0.8%,钢管具有优良的冷、热加工性能,其各项性能均满足ASME和GB标准的使用要求。 相似文献
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超塑性奥氏体-铁素体双相不锈钢00Cr25Ni7Mo3N的研制 总被引:1,自引:0,他引:1
通过电弧炉-电渣重熔工艺开发研制了成分为(%):0.021C,24.16Cr,7.21Ni,2.87Mo,0.17N,0.48Cu超塑性双相不锈钢00Cr25Ni7Mo3N。试验结果表明,00Cr25Ni7Mo3N超塑性双相不锈钢的耐孔蚀性和耐缝隙腐蚀性远高于传统的304L和316L奥氏体不锈钢。在变形温度960℃、应变速率2×10-3/s时,00Cr25Ni7Mo3N超塑性双相不锈钢的最高延伸率为960%,该钢超塑性变形的均匀性优于TC4钛合金,可显著减轻构件的重量。 相似文献
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通过对不锈钢主要冶炼设备———初炼炉、精炼炉、真空吹氧装置的分析以及一步法、二步法、三步法不锈钢工艺路线的比较 ,提出应根据不锈钢的生产规模、产品大纲、原料供应、现有车间条件和动力供应状况 ,合理选择相应的主要冶炼设备和工艺路线 ,以便达到最佳的经济、技术效果。文中列出不锈钢冶炼设备和工艺路线选择一览表。 相似文献
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Jacques Charles 《国际钢铁研究》2008,79(6):455-465
Duplex stainless have always been an exiting area of interest for researchers, stainless steel producers, fabricators and end users. They present very diversified technical challenges and simultaneously attractive in‐service properties at excellent cost/properties ratios, particularly in critical markets including oil and gas, chemical industry, pulp and paper industry, water systems, desalination plants, pollution control equipments, chemical tankers, etc. This explains why although they still remain a marginal production in the stainless steel business (less than 1%) dedicated international conferences have been organised since about 25 years. The purpose of this paper is to present a review of the 100 scientific contributions presented during the latest international duplex stainless steel conference witch took place in Grado, Italy, on 18‐20 June 2007. The main topics concerned microstructure and mechanical properties, weldability, corrosion resistance and in‐service properties. The “standard” duplex stainless steels, i.e. the 2304, 2205, and the family of 2507 (Cu,W, ...) grades were confirmed as very valuable grades with outstanding performances proven in more than 20 years successful in‐service applications. New grades including the so‐called lean duplex dedicated to volume oriented markets (possible replacement of 304/316 grades) and some “niche” grades dedicated to very specific markets were presented. It was pointed out that the duplex grades start to be well established products particularly suitable for corrosion resistance applications. They show a two‐digit yearly growth thanks to the production of new grades and production ranges (coils and bars) targeting the replacement of the more costly 300 series including 304 but also rusty carbon steel in e.g. structural application. 相似文献
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用MMS-200热模拟实验机对2507超级双相不锈钢(/%:0.022C、0.58Si、25.35Cr、7.17Ni、4.05Mo、0.28N)12 mm热轧板在1 000~1150℃、应变速率0.01~10s-1下进行了热压缩实验。实验结果表明,在应变速率一定的条件下,变形温度越高,2507超级双相不锈钢峰值应力越低;在变形温度一定的条件下,峰值应力随着应变速率的增加而增加。根据热变形方程计算得到压缩变形时的平均表观应力指数n=3.25,热变形激活能Q=460kJ/mol。基于实验数据构建了2507超级双相不锈钢在相应变形条件下的热变形方程。 相似文献
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热卷箱是置于热连轧钢带生产线上粗轧机与精轧机之间,将中间坯卷取和开卷的一种设备。通过设备和工艺攻关,太钢2250热连轧生产线成功地应用热卷箱规模化生产热轧2~5.2 mm 300系和400系不锈钢带,提高了钢带的表面质量和生产效率。文中探讨了热卷箱应用于不锈钢带生产的优劣势和生产中易出现的划伤和花印等问题。 相似文献
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