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This study has been performed to relate the powder properties to the process parameters of the plasma-rotating-electrode-process (Prep). A regression equation for average powder diameter was acquired from the experimental data as . A model is developed to describe the nitrogen pick-up by the Prep. On the basis of this model an expression for nitrogen content of the powder produced is deduced as: The powder has a solidification structure of austenitic dendrites. The CrN precipitates, the amount of which is dependent upon the nitrogen content, can be found in the interdendritic areas. During the solution annealing the Cr2N precipitation reaction occurs in both of the inter- and intradendrite. 相似文献
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A. N. Smirnov 《Russian Metallurgy (Metally)》2012,2012(6):518-522
The history of the development of producing thin sheets and strips by continuous casting methods is considered. The mechanism of this sheet formation during casting of steel in a two-roll continuous caster is described. The advantages of this process over the corresponding traditional technologies are discussed. 相似文献
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论连铸设备在连铸生产中的地位和作用 总被引:1,自引:0,他引:1
本文对连铸设备对提高连铸生产效率、质量和效益的作用,连铸设备组成与连铸设备管理中几个主要问题,连铸装备水平的优化与提高,连铸工艺与设备的结合,抓好连铸设备人员培训等问题进行了论述。 相似文献
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A model for the calculation of flow patterns and inclusion separation in continuous casting tundishes is described. Velocity and turbulence fields for the liquid steel are calculated, assuming three-dimensional, turbulent steady-state flow. A transport equation for particles is solved, which takes into account buoyancy, convection und turbulent dispersion. Particle concentration fields and the percentage of removed particles are calculated as a function of particle rise velocity. The influence of increased tundish width and height and of dams and weirs on the rate of inclusion separation is investigated for a slab caster tundish. Non-dimensional representations and approximation expressions are discussed and used to compare the computed removal rates to measured values from literature. 相似文献
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Manabu Iguchi Tadatoshi Nakatani Hirohiko Tokunaga 《Metallurgical and Materials Transactions B》1997,28(3):417-423
A previously developed multineedle electroresistivity probe was used to investigate the shape of bubbles generated at the
exit of a central single-hole bottom nozzle in molten Wood’s metal and mercury baths. This probe is capable of detecting the
vertical cross section of rising bubbles. The shape of bubbles just after the detachment from the nozzle exit was correlated
as a function of a modified Reynolds number and a modified Weber number. Furthermore, the relations between the shape of bubbles
and the radial distributions of bubble characteristics specified by gas holdup, bubble frequency, etc. were derived. As a result, it is possible to predict the shape of the bubbles by measuring the bubble characteristics with
a conventional two-needle electroresistivity probe. 相似文献
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本文介绍珠钢CSP连铸投产一年多的生产实践,描述连铸主要设备及特点,对连铸工艺进行介绍及总结,特别是对于连铸开浇失败和漏钢,提出一些对策和措施。 相似文献
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氮在钢中通常是一种有害元素,钢中氮含量高会严重影响钢的高温强度和高温塑性,降低钢的深冲性能。在连铸环节,保护浇铸不当会导致钢水增氮。基于连铸生产的实绩,介绍了梅钢连铸生产中对钢水增氮的控制,通过分析钢水连铸过程中的增氮机理,调查梅钢连铸当前的增氮现状,查找出了连铸增氮的主要影响因素,并对连铸工序的生产工艺、设备、耐材等方面实施了改进,有效减少了连铸的增氮保留,减少了改钢损失,为高质量要求钢种的生产创造了条件。 相似文献
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王建忠 《冶金标准化与质量》2010,(5):46-47,51
介绍12流方坯连铸机生产、质量与设备改进情况,主要针对200 mm×285 mm规格的大断面连铸坯和150×150、165 mm×165 mm小断面连铸坯的生产问题,通过改进导向段、优化二次冷却、改进结晶器和喷淋管、优化操作要点等手段,使得铸坯质量有了很大改善,同时也使生产效率有了很大提高。 相似文献
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E. A. Maksimov 《Russian Journal of Non-Ferrous Metals》2011,52(2):171-174
Already-existing and new kinematical flatness criteria are experimentally investigated. The effect that both the irregularity of friction conditions across the width of a strip and the mismatch factor for circumferential speed of rollers has on the variation in the geometrical shape is determined. 相似文献
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通过对连铸实际生产过程中影响中间包使用寿命的原因分析,制定提高中间包使用寿命的措施,并在生产实践中取得了预期效果. 相似文献