稀土镁球墨可锻铸铁的熔炼及其生产应用

一、稀土镁球墨可锻铸铁的熔炼我们用于球墨可锻铸铁的熔炼设备是2～2.5t/h的两排大间距热风冲天炉,其主要炉型尺寸和工艺参数如表1所示: 我们用地方焦炭和地方生铁,为使地方生铁和地方土焦能熔炼出质量好、温度高的铁水,将风箱风压     

用杭钢生铁和金华焦试制球墨铸铁

以前各地生产球铁多用本溪生铁作原料,不敢用地方生铁,主要原因是地方生铁含磷较高.最近有些单位遵照毛主席“备战、备荒、为人民”的伟大战略方针,试验用地方生铁生产球铁,获得初步成功.这个方向是正确的,经验是可贵的.其实,不少地方生铁的含磷量虽比本溪铁高,但相差不多,只要采取适当的措施,生产球铁还是可以的.本刊以前曾报道过吉林、新疆、河南、四川等省的一些工厂用地方生铁生产球铁的经验,本期又刊登两篇,供大家参考.希望有更多的单位进行这方面的试验,并将经验总结寄给我们.     

磷对RCM白口铸铁组织和性能的影响

前言在RCM白口铸铁磨球生产过程中发现,只要换用高磷地方生铁,其机械性能特别是冲击韧性就显著下降,此外,磨球内部还会出现大量缩松导致产品报废。我国大多数地方生铁含磷较高,新疆跃进钢铁厂生产的地方生铁含磷通常在0.3％以上。为了探讨利用这种高磷地方生铁生产RCM铸铁的可能性,我们对磷在RCM铸铁中的存在状态及其对冲击韧性和硬度的影响进行了研究,并就如何克服磷的不利影响,在铸造方法及热处理方面做了有益的探索。一、试验条件及方法实验主要在实验室进行,铁水在30kg中频感应     

利用地方铁焦防止白口保证机械性能的措施

在全国一派大好形势下,我区发展了地方钢铁工业。我厂使用的生铁原由区外供应,现基本改为区内供应。由于区内钢铁厂是新建的,目前生产出来的生铁质量不稳定。焦炭也改为土法炼出的土焦。其特点是强度低、易碎,反映在铁水上就是增碳特别严重。     

锑对钒钛蠕墨铸铁组织及耐磨性能的影响

一、前言以钒钛生铁为原料研制生产钒钛蠕墨铸铁是一种具有我国地方特色,并有良好综合性能的新型铸铁材质。我省钒钛磁铁矿资源丰富,出产的钒钛铁已用于生产活塞环、机床等要求耐磨、高强度的铸件产品。用马钢钒钛生铁试制钒钛蠕墨铸铁件,因生铁含     

高硫铁水生产球墨铸铁的实践与体会

介绍了利用地方生铁、地方焦熔炼的高硫铁水生产稀土镁球铁的经验。     

大间距风口冲天炉在熔炼地方生铁方面的应用

本文介绍了用大间距风口冲天炉熔炼地方生铁方面的经验。指出能获得高温铁水(一般在1400~1450℃,最高达1500℃),且维持时间较长,能利用地方生铁生产符合一定质量要求的铸件,有利于生产的正常进行。     

浅谈生铁(1)

介绍了生铁一词的界定和冶炼生铁的工艺,阐述了炼钢生铁和铸造生铁的用量在生铁总产量中的占比及两类生铁在规格、品种方面的差别.指出铸造生铁的发展动向是:(1)铸造生铁必须与铸铁件生产技术同步发展,对铸造生铁质量的要求和品种规格的确定应该保持与时俱进的传统;(2)采用高纯生铁是淡化干扰元素的含量、抑制其有害作用的重要途径.最...     

地方生铁熔铸球铁的试验和初步应用

在伟大领袖毛主席“备战、备荒、为人民”的伟大战略方针指引下,在厂党委和革委会的领导下,我们破除迷信、解放思想,因地制宜,就地取材,应用广东地方生铁进行了熔铸球墨铸铁的试验。目前,我们只对广州钢铁厂、平远钢铁厂和怀集县生产的生铁与各地铸造球墨铸铁普遍     

电石在铸铁熔练中的应用

一、前言我区（牡丹江地区）地方生铁一般为高硅、高磷、高硫、低磷、低锰。     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

The Mirror with Patterns of Auspicious Animals and Grapes——Exquisite cast mirror and the technology of surface tin-enrichment by rubbing-in and infiltration of tin-rich powder

<正>Bronze mirrors were used by the Chinese people before the introduction of the glass mirror.Only after it was replaced by the glass mirror did the bronze mirror gradually retreat from people's lives.Different styles of bronze mirrors were made in different historical periods,particularly in the Warring States Period,the Han and Tang Dynasties,which were the three peaks of the development of bronze mirror arts in ancient China.The casting techniques were exquisite.The surface of the bronze mirror was smooth and bright enough to reflect one's image,and there were scarcely any casting defects on the mirror surface.On the back of the bronze mirror,there were rich depictions of Arts and Humanities,and the ornamentations were also     

The 9th China International Diecasting Congress & Exhibition

The 9th China International Diecasting Congress ＆ Exhibition was held on July 22-24, 2014 at Shanghai New International Expc Centre. This exhibition was the most successful over the years, with over 6890 visitors and 155 exhibitors, and the exhibition area increased by 30% from 9,500 square meters in 2012 to 12340 square meters. Die casting enterprises from a total of 24 countries and regions, including China mainland, Chinese Taiwan and Hong Kong, South Korea, Japan, Germany, India, Thailand, Malaysia, the United States, Russia, Australia, Iran, Ukraine, Brazil, Colombia, Singapore, Austria, Canada, Croatia, France, Turkey, United Kingdom, Vietnam, attended the congress and exhibition.     

Introduction of the Fluid Control Engineering Institute of Kunming University of Science and Technology

正The Fluid Control Engineering Institute of Kunming University of Science and Technology was set up in 1996.The researches of institute concentrate on electro-hydraulic(pneumatic)servo/proportional control and hydromechatronics.The Institute is committed to research and development of electro-hydraulic control of high-end technical equipment in ferrous metallurgy refining produc-     

RARE METALS Volume Contents

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Antimony Induced Crystallization of Amorphous Silicon

Antimony induced crystallization of PVD (physics vapor deposition) amorphous silicon can be observed on sapphire substrates. Very large crystalline regions up to several tens of micrometers can be formed. The Si diffraction patterns of the area of crystallization can be observed with TEM (transmission electron microscopy). Only a few and much smaller crystals of the order of 1μm were formed when the antimony layer was deposited by MBE (molecular beam epitaxy) compared with a layer formed by thermal evaporation. The use of high vacuum is essential in order to observe any Sb induced crystallization at all. In addition it is necessary to take measures to limit the evaporation of the antimony.     

A CUMULATIVE FATIGUE DAMAGE RULE UNDER THE ALTERNATIVE OF CORROSION OR CYCLIC LOADING

Fatigue damage increases with the applied loading cycles in a cumulative manner and the material deteriorates with the corrosion time. A cumulative fatigue damage rule under the alternative of corrosion or cyclic loading was proposed. The specimens of aluminum alloy LY12-CZ soaked in corrosive liquid for different times were tested under the constant amplitude cyclic loading to obtain S-N curves. The test was carried out to verify the proposed cumulative fatigue damage rule under the different combinations among corrosion time, loading level, and the cycle numbers. It was shown that the predicted residual fatigue lives showed a good agreement with the experimental results and the proposed rule was simple and can be easily adopted.