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高氮Fe-Cr-Mn-Ni系奥氏体不锈钢的加压感应熔炼 总被引:3,自引:0,他引:3
采用MgO坩埚高频真空感应炉在氮气压力0.45~1.0MPa、温度1640~1700℃下,对加压感应熔炼高氮Fe-Cr-Mn-Ni系奥氏体不锈钢进行了实验研究。结果表明,1913K、1.0MPa氮气氛中Cr12、Cr17Mn5Ni5、Cr19Mn15和Cr20Mn8不锈钢中氮的溶解度分别为0.391%、0.692%、1.120%和0.899%,氮在液态不锈钢中的溶解与Sievert定律有所偏离;氧浓度在350×10-6内,1913K、1.0MPa氮气氛中Cr20Mn8钢液的吸氮反应仍为一级反应,其传质系数为0.023cm·s-1;随钢中氧浓度的增加,液态钢的吸氮速率和钢液中的平衡氮含量显著降低。 相似文献
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氮气加压熔炼高氮钢若干理论问题探讨 总被引:5,自引:0,他引:5
导出了氮在铁合金溶液中的溶解度模型,探讨了表面活性元素对吸氮过程的影响,且对含氮铁合金溶液的凝固过程、氮的偏析及保持氮在熔体中的最小压力进行了精确解析。 相似文献
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对14Cr8Mn,16Cr7Mn2Mo,18Cr8Ni2Mo不锈钢中氮的溶解行为进行了实验研究.研究结果表明,1 873K,N2气压力为0.1 MPa时,14Cr8Mn,16Cr7Mn2Mo,18Cr8Ni2Mo不锈钢中氮的溶解度(质量分数)分别为0.242%、0.299%和0.226%,氮在液态不锈钢中的溶解符合Sievert定律;在对钢液没有搅拌的情况下,测定了1 873 K时氮在这三种不锈钢中的传质系数,分别为5.72×103m/min,6.13×103m/min和7.68×10.m/min;氮在不锈钢中的传质系数受表面活性元素氧、硫含量的影响. 相似文献
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真空/加压感应炉以10 MPa高纯氮(体积分数≥99999%)为氮源熔炼了Fe Cr V高氮钢,分析了氮的溶解度与氮分压和铬、钒含量的关系。氮在Fe Cr V合金中的溶解服从Sievert定律,氮的溶解度随铬和钒含量的增加而增加。用Al和Fe Al(铝的质量分数为50%)合金加顶渣对Fe Cr V合金进行了脱氧实验,Fe Al合金加CaF2 CaO Al2O3(各成分比例为1∶4∶1)顶渣40 min可使Fe 20Cr 193V合金的氧的质量分数降低到0007 2%。 相似文献
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A simple and feasible method for the production of high nitrogen austenitic stainless steels involves nitrogen gas alloying and adding nitrided ferroalloys under normal atmospheric conditions. Alloying by nitrogen gas bubbling in Fe Cr Mn Mo series alloys was carried out in MoSi2 resistance furnace and air induction furnace under normal atmospheric conditions. The results showed that nitrogen alloying could be accelerated by increasing nitrogen gas flow rate, prolonging residence time of bubbles, increasing gas/molten steel interfaces, and decreasing the sulphur and oxygen contents in molten steel. Nitrogen content of 069% in 18Cr18Mn was obtained using air induction furnace by bubbling of nitrogen gas from porous plug. In addition, the nickel free, high nitrogen austenitic stainless steels with sound and compact macrostructure had been produced in the laboratory using vacuum induction furnace and electroslag remelting furnace under nitrogen atmosphere by the addition of nitrided alloy with the maximum nitrogen content of 081%. Pores were observed in the ingots obtained by melting and casting in vacuum induction furnace with the addition of nitrided ferroalloys and under nitrogen atmosphere. After electroslag remelting of the cast ingots, they were all sound and were free of pores. The yield of nitrogen increased with the decrease of melting rate in the ESR process. Due to electroslag remelting under nitrogen atmosphere and the consequential addition of aluminum as deoxidizer to the slag, the loss of manganese decreased obviously. There existed mainly irregular Al2O3 inclusions and MnS inclusions in ESR ingots, and the size of most of the inclusions was less than 5 μm. After homogenization of the hot rolled plate at 1 150 ℃×1 h followed by water quenching, the microstructure consisted of homogeneous austenite. 相似文献
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�ܴ��� �������У��������Ӻ��֣������� ����ʥ�� 《钢铁研究学报》2013,25(8):16-18
In order to research the effect of nitrogen absorption with blowing N2 and adding FeCrN alloy to the liquid steel, the nick-free high nitrogen stainless steel (17Cr12Mn2Mo) was smelted on the 50kg vacuum induction melting furnace by changing the nitrogen pressure, temperature and adding FeCrN alloy. The result was compared to the theoretical calculation. The results show, stainless steel with certain nitrogen content can be smelted through changing nitrogen pressure and temperature, and the effect of increasing nitrogen pressure is much better than changing temperature, when the nitrogen pressure is up to 0??65MPa, the actual result is equal to the theoretical calculation; the effect of adding FeCrN alloy is better than increasing nitrogen press and controlling temperature, and the actual result is higher than the theoretical calculation. 相似文献
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高氮钢的基础研究及应用进展 总被引:2,自引:0,他引:2
介绍了高氮钢结构特点的最新研究,高氮钢平衡相图的进展及其在高氮钢成分设计方面的应用;概括了氮在钢液中的溶解度公式和高氮钢熔炼过程中的关键问题;分析了氮在奥氏体钢、铁素体钢和双相不锈钢中的作用,即氮在不牺牲强度的同时不仅提高了钢的韧性,且改善了钢的抗腐蚀性能;并列举了一些典型的高氮钢的用途。 相似文献
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高氮不锈钢研究的发展近况 总被引:4,自引:0,他引:4
介绍了国内外高氮不锈钢研究近期的成果,内容涉及高氮不锈钢基础研究、力学性能、耐腐蚀性能、焊接性及高氮不锈钢新材料,反映了国内外高氮不锈钢研究的发展状况.鉴于高氮不锈钢卓越的综合性能而国内高氮钢研究已远远落后于国际发展水平的现状,应尽快在国内建立高氮钢试验装置,加快国内高氮不锈钢基础理论、生产工艺技术(特别是冶炼技术)和新材料的研究,把握不锈钢发展的方向,为中国不锈钢的发展提供有力的支持. 相似文献