共查询到18条相似文献,搜索用时 328 毫秒
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分析了真空度、温度和氮化物成分对钢中氮溶解度影响,并在50 k真空感应炉对不同化学成分的合金钢(/%:0.06~0.36C、≤3.23Si、≤2.20Al、≤9.00Cr)进行3种氮化物-氮化硅、氮化锰和氮化铬的增氮试验。结果表明,气相中氮气分压对钢液中氮溶解度影响最大;钢中Ti、Cr提高氮溶解度和氮化物的收得率;增加C含量则降低氮溶解度和氮化物的收得率;钢中含有一定量的铝,可以显著提高氮化物的收得率。40 kPa氩气压力,1 600~1 650℃时在硅钢、结构钢和9%Cr钢中氮化硅、氮化锰、氮化铬的收得率分别为25%~30%、30%~50%、60%~100%。 相似文献
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高氮铬锰奥氏体不锈钢有着极为广泛的应用前景,然而氮含量对其相转变的影响尚不十分清晰。设计并冶炼了氮质量分数为0.02%~1.20%的试验钢,对各钢的平衡相转变进行了热力学计算,对δ铁素体和Cr2N的形貌进行了观察。结果表明,钢中δ铁素体的最大析出量随着氮含量的升高而降低,当氮质量分数超过1.05%后,无δ铁素体析出。获得了试验钢加热时δ铁素体的析出温度与氮含量的关系式。随着氮含量的升高,试验钢在冷却时Cr2N的析出温度逐渐升高,并获得了其定量关系式。在GN04钢中,1 200 ℃等温2 h后的δ铁素体主要沿三叉晶界分布。Cr2N析出优先在晶界形成,然后朝着晶内发展。在相同等温条件下,试验钢中Cr2N的析出量随着氮含量的升高而增大,且层片间距随之减小。 相似文献
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本文研究了与电弧炉,平炉、转炉钢中氮含量相当的氮含量和微量钛对20CrMnB钢淬透性的影响。结果表明.随着钢中氮含量增加,其淬透性降低。用因子Cβ=3.43N—Ti来表达氮和钛对20CrMnB钢淬透性的综合影响。提出对于平炉.转炉冶炼的低氮20CrMnB钢,可用钛固定钢中氮;而对于电弧炉冶炼的高氮钢,宜采用铝和钛同时加入工艺。 相似文献
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真空感应炉充氩冶炼高氮Cr-Mn-Mo-Cu奥氏体不锈钢 总被引:2,自引:2,他引:2
用 2 5kg真空感应炉在Ar气压力 (0 4 0~ 0 4 5 )× 10 5Pa下进行成分 (% )为 0 0 10~ 0 0 4 7C ,16 0 4~ 19 72Cr,6 39~ 15 31Mn ,1 83~ 3 2 9Mo ,0 2 5~ 1 4 4Cu ,0 2 4~ 0 4 6N的奥氏体不锈钢的熔炼试验 ,研究炉内压力、合金成分、添加氮化物类型和熔化停留时间对钢中氮含量和氮的回收率的影响。试验结果表明 ,加入氮化锰的增氮效果和氮的回收率均优于粒状氮化铬和氮化铬 氮化锰的混合物 ;随钢中合金元素的增加 ,氮的活度系数降低 ,钢中氮含量和氮的回收率明显提高。 相似文献
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本文阐述了制作彩色显像管销钉用材,Al、N含量极低的430Ti钢的冶炼工艺。低N低Al的真空铬是冶炼该钢较为理想的铬料,并在真空感应炉中提纯,以降低其氧量。在提纯时将铬量配至19%是合理的。在真空感应矿中冶炼430Ti钢时,待钢液脱氧良好时加入J-Ti,有利于提高和稳定Ti的收得率,确保游离Ti的含量。在高真空,较低温度的条件下,通过较长时间的精炼,由于Ti与N结合成TiN并充分上浮,可使铜液中的N量降低至0.91%以下。 相似文献
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铬锰氮钢铸件的制造常因钢中含氮(N)使铸件产生气孔。本文介绍了应用感应炉冶炼铬现锰氮时,通过严格冶炼工艺措施,较发的防止铸件出气孔缺陷的经验。 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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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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005Cr25Ni20钢(%:24~26Cr、19~22Ni)要求C、P、S、Si等杂质元素含量低-(%):≤0.010C、≤0.010S、≤0.010P、≤0.15Si,因此采用3 t真空感应炉+真空自耗重熔炉冶炼工艺。通过采用优质纯铁(%:0.009C、0.035Si、0.001 2S、0.004 5P)、高纯铬铁(%:0.010~0.021C、0.11~0.13Si、0.002 5~0.005 0S、0.001 5~0.005 0P)和Ni板(Ni≥99%),真空感应炉熔炼时加A1、金属Ca、Ni-Mg脱氧,全程计算机控制真空自耗重熔速度,该钢成品化学成分为(%):0.005~0.007C、0.33~0.34Mn、0.03~0.04Si、0.001~0.002S、0.004~0.005P、24.34~24.62Cr、21.20~21.25Ni,达到技术要求,钢中氧含量为(12~22)×10-6,低于电渣重熔钢的氧含量-(30~80)×10-6。 相似文献
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To replace nickel-based stainless steel, a nitrogen-bearing stainless steel was produced to lower the production cost stemming from the shortage of nickel recourses. Thermodynamic model to calculate the saturated nitrogen content in the stainless steel was developed and the model was validated by experimental measurements performed with a high temperature induction furnace. Nitrogen gas under constant pressure was injected into the molten steel with a top lance. Thus, the nitrogen was transferred to the molten stainless steel. The effects of chemical composition, temperature, superficial active elements and nitrogen flow rate on the transfer of nitrogen to the steel were investigated and discussed. The results showed that the dissolution rate of nitrogen in the molten steel increases with a higher temperature and larger nitrogen flow rate but decreases significantly with an increase in the content of surface-active elements. Alloying elements such as chromium and manganese having a negative interaction coefficient can increase the dissolution of nitrogen in the molten steel. It was also proposed that the primary factor affecting the final saturated nitrogen content is temperature rather than the dissolved oxygen content. 相似文献
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To meet the high cleanliness requirements of bearing steel used in high-speed railway trains, a new production process combining vacuum induction melting and electroslag remelting (ESR) was used to produce G20CrNi2Mo bearing steel. To investigate the effect of remelting on the cleanliness of the steel, two kinds of G20CrNi2Mo steels were prepared using an ESR furnace with and without high-purity argon protection. The results show that the G20CrNi2Mo electrodes smelted using a vacuum induction furnace have very high cleanliness 0.010[P%]–0.004[S%]–0.0012[O%]–0.0041[N%]). Unprotected ESR leads to an increased oxygen content, while protected ESR prevents any increase in oxygen content. Both protected and unprotected ESR results in significant desulphurisation, with desulphurisation rates reaching over 50%. The protected ESR process removes Al2O3–SiO2–MnO inclusions, and the remaining inclusions in the steel can be divided into two categories, Al2O3 and Al2O3–MnS. 相似文献
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