包钢对外经济技术合作的现状和前景

文章针对包钢对外经济技术合作的业绩、前景和优势进行了阐述,用一些业绩实例说明了包钢的对外经济技术合作应是深入研究的课题,是包钢实现双百亿美圆目标的新的利润增长点.     

包钢档案管理系统设计及应用前景

随着信息化技术的不断发展,档案管理领域也在不断的引进信息化技术,以提高档案管理工作效率.文章以包钢(集团)公司档案管理信息化、数字化为目标,对包钢现有档案管理模式进行分析,采用数字化、信息化技术研究设计了包钢档案管理信息系统的功能与技术路线,实现包钢(集团)公司档案数字化管理.     

科学发展铸就包钢焦炉特色管理

文章以包钢焦化50年的发展为线索,以焦炉技术进步的实例为题材,阐述了包钢炼焦技术的科学发展历程,总结了包钢焦炉技术的管理,体现了包钢炼焦炉管理的特色。     

包钢高炉现状及长寿工作对策

高炉长寿问题关系到包钢公司的生存与发展,也是目前公司生产系统中 亟待解决的重大课题之一。关注国内外先进高炉的长寿技术措施,为包钢高炉如何实现长寿广开思路,将对包钢生产产生良好的影响以及巨大的经济效益。     

包钢烧结球团技术进步

文章论述了近年来包钢烧结球团的技术进步,通过技术改造和技术攻关,包钢烧结球团生产主要技术指标取得了长足的进步,为包钢高炉利用系数的提高创造了条件。     

矿石还原软化透气性测定

目前,如何强化包钢高炉冶炼已成关键问题。为查明影响包钢高炉强化的基因和解决的途径,我们对包钢、首钢、鞍钢烧结矿的还原软化透气性进行了测定,初步查清了包头矿软熔透气性与首钢、鞍钢烧结矿的差别及其特性,并对现行的高炉配料和配加公益明矿以取代白云块矿进行了测定比较,结果表明,包钢烧结矿配加公益明矿是降低料层压损、提高料柱透气性的有效措施。     

关于促进包钢市场营销体制改革的探讨

通过对包钢目前营销体制的分析,围绕包钢营销战略的制定,加大科研力度,新产品开发,价格体制改革等方面内容进行了探讨.进一步对如何改善包钢的营销环境,完善、优化物流管理,建立高效可行的预警机制,化解市场危机等问题提出了建议.     

包钢钢铁领域中未来EBSD的应用展望

文章介绍了包钢SEM上即将安装的EBSD硬件装置的基本原理。提出了EBSD分析技术在包钢钢铁研究领域中的应用,并对包钢正在研发的管线钢领域进行了研究切入点的深入阐述。     

包钢职工医疗保险信息管理系统改造

文章介绍包钢职工医疗保险信息管理系统改造的背景,论述了新一代包钢职工医疗保险信息管理系统的功能和技术特点,阐述了网络构建原理和数据库应用技术,以及应用程序所包含模块和所实现的业务功能,并对其应用效果进行了统计分析.     

包钢烧结烟气除氟脱硫技术比较

包钢炼铁厂5台烧结机分别采用了LJS烧结干法脱硫工艺和石灰石-石膏湿法两种烧结烟气脱硫技术。文章简要介绍了这两种技术在包钢的成功应用,并重点分析了两种脱硫技术之间的差异,从而为包钢合理选择脱硫技术提供参考。     

Characteristics of sintering processes

Conclusions New, more accurate formulations of the autonomy and stress transfer principles are proposed. Quantitative characteristics of autonomy are defined. An examination is made of characteristics determining quantitatively the participation of various types of deformation (with contact fixation or disturbance) in consolidation (sintering, sintering under pressure, shaping) and characteristics determining the degree of localization of deformation. These characteristics can be expressed in the form of various functions of the paramter — the fraction of the volume of particles displaced as a result of flow of the material of a critical zone. The possibility of determining certain characteristics by experiment is demonstrated.Translated from Poroshkovaya Metallurgiya, No. 3(183), pp. 12–18, March, 1978.     

Roentgenographic Determination of Residual Stresses in Carbonitrided Layers

The aim of the current investigation is to examine the influence of carbonitriding in low-temperature plasma on forming macroresidual stresses in the surface layer of the materials. Particular modes of ion carbonitriding are considered in which layers of different depth and different surface microhardness are obtained. The residual stresses in the α-Fe in carbonitride layers are determined by the method of “sin²Ψ.” The results show that at different modes of ion carbonitriding, residual macrostresses are obtained that have different values and depend on the qualitative characteristics of the formed carbonitrided layers.     

电主轴单元的动静态特性分析

通过对电主轴单元实例的有限元分析(包括建立数学模型、绘制振型曲线等)，阐述了电主轴单元动静态特性的分析方法及意义，提出了改善电主轴动态特性的措施。     

Comparative study of dewatering characteristics of metal precipitates generated during treatment synthetic polymetallic and AMD solutions

The sludge dewatering characteristics expressed in terms of settling, filtration and centrifugation of metal precipitates generated during treatment of polymetallic solutions and synthetic acid mine drainage have been evaluated in this research. Results show that dewatering properties of metallic sludge vary depending on the type of matrix (Cl⁻; SO₄²⁻), precipitating agent, and metals present in effluent. Metal hydroxides (at pH 10.0) and metal phosphates precipitates (at pH 7.0) are amorphous in nature, thus difficult to dewater. In these treatment methods, the substitution of chloride matrix by sulphate one improves considerably dewatering properties (specific resistance to filtration = 6.60 × 10¹³ and 2.35 × 10¹³ m/kg for the chloride and sulphate matrix, respectively). In the case of sulphide and carbonate treatments (pH 8.0), precipitates obtained are semi crystalline, and crystalline form, respectively, and no influence of the matrix was detected on dewatering characteristics.     

Mechanical properties of “Thick” amorphous metallic wires produced by the Ulitovskii-Taylor method

The strength and plastic characteristics of thick (d = 40–120 μm) amorphous wires made of a model Co-based alloy and fabricated by the Ulitovskii-Taylor method are studied. They are found to have stable strength and plastic characteristics along the length. The plasticity of the thick wires is high, and they can form a full knot and undergo a load of 0.5 ultimate tensile strength in this state. The surface state and fracture surfaces of the amorphous wires are analyzed by scanning electron and optical microscopy. The wires are found to have a smooth lustrous lateral surface almost free of defects and to retain stable geometrical parameters along their length. Zones with different positions and frequencies of shear bands can form on the wire surface depending on the type of deformation action. The fracture surfaces of the thick amorphous wires are specific: a venous zone consists of several large pronounced principal “veins” and a rare network of adjoining secondary veins.     

The use of self-propagating high-temperature synthesis and argon-arc overlaying when strengthening the surface of products made of titanium alloys

A new method for the deposition of protective coatings (wear-resistant overlaying) that are 2 to 10 mm thick and more on the surface of titanium articles is suggested, developed, approved, and patented. The method, called “SHS-arc overlaying,” combines the exothermic synthesis of adding material (AM) and argon-arc overlaying, which proceed simultaneously with the deposition of the coating. AMs made of exothermic mixtures are developed. Using this new method, protective composite coatings for titanium articles are obtained. The physicochemical, microstructural, and exploitation properties of the overlaying are investigated. Its operational characteristics exceed the characteristics of standard samples by a factor of 1.5–2.0. This new technology can be recommended for the deposition of protective coatings on products of wide indentation made of titanium alloys.     

Development of Fe-based shape memory alloys associated with face-centered cubic-hexagonal close-packed martensitic transformations: Part II. transformation behavior

As part of a study on the newly developed Fe-based shape memory alloys associated with face-centered cubic-hexagonal close-packed (fcc-hcp) martensitic transformations, transfor-mation behavior is characterized utilizing a combination of electrical resistance, dilatometry, and magnetic susceptibility measurements. The characteristics of thermally induced and strain-induced ε martensitic transformations under the influence of antiferromagnetism are discussed based on the experimental results. The variations of shape memory properties with prestraining temperature are interpreted in terms of the transformation characteristics. It is shown that the ε martensite can be readily strain-induced under the stabilization effect of the antiferromagnetism which strongly suppresses the thermally induced transformation. The strain-induced transfor-mation of ε martensite is more preferred as a predominant deformation mechanism at low tem-peratures under a combined influence of the antiferromagnetism and other physical factors, whereas the irreversible deformation mode is more likely with prestrain at relatively high tem-peratures. The transformation characteristics can be significantly changed by alloying and mechanical /thermal treatments. This offers a possibility of developing new practical Fe-based shape memory alloys with a wide range of mechanical and physical properties.     

Structural changes in eutectic alloys during flame spraying

Results of studying microstructural changes in eutectic alloys with different types of spraying are summarized. A distinctive feature of alloys which have eutectic carbides of the type MeC is that they do not change their shape and composition during different methods of spraying. The morphological characteristics of oxides phases are demonstrated. Addition of alloying elements with an affinity for oxygen makes it possible to alter the morphological characteristics.Materials Science Institute, Ukrainian Academy of Sciences, Kiev. Translated from Poroshkovaya Metallurgiya, Nos. 5–6, pp. 57–63, May-June, 1996. Original article submitted June 3, 1994.     

High-temperature tribotechnical characteristics of ceramics based on aluminum nitride

Studies have been made on the structure, phase composition, and strength parameters for ceramics based on AlN containing 5–15 mass % TiO₂. The tribotechnical characteristics of these ceramics have been determined under sliding friction conditions at 20–900°C in air. Quantitative characteristics are proposed for the friction surface as determined by metallographic, microdurometric, and sclerometric examination of the surfaces produced at various treatment temperatures. Materials Science Institute, Ukrainian Academy of Sciences, Kiev. Translated from Poroshkovaya Metallurgiya, Nos. 3-4(400), pp. 43–48, March–April, 1998.     

Investigation of the morphology and particle size of silicon carbide nanopowders using electron microscopy

Using transmission and scanning electron microscopy, the shape and particle size of nanopowders (NP) of silicon carbide and pyrolytic carbon are determined. The results are compared with other methods of analyzing the dimensional characteristics of NPs, and their tendency to aggregation is analyzed. It is established that silicon carbide NPs in the state of delivery are presented by globular aggregates from 0.1 to 1 μm in size which are formed by faced nanoparticles that are preferentially 50–70 nm in size. The latter are characterized by octahedron-, cube-, and intermediate-shaped facing; i.e., the tendency for rounded edges and vertexes and the formation of convex faces is observed. Nanoparticles of pyrolytic graphite form aggregates up to 150–200 nm in size containing globular particles 30–40 nm in size.