我国石油专用管生产企业进行重组的思考及建议

通过对我国石油专用管业所面临的国际国内市场形势以及国际钢管企业重组的情况进展及特点的分析,认为重组已成为国际国内市场发展的必然趋势,企业重组不只出现在强势企业对弱势企业,强强联合也逐渐增多。对中国石油专用管生产企业的重组以及建议重组的原则、范围、方式及举措提出了见解。     

A potentiokinetic reactivation method for predicting the I.C.C. and I.G.S.C.C. sensitivity of stainless steels and alloys

The present paper is a continuation of an earlier study dealing with a new method of electrochemical determination of the sensitivity to intercrystalline corrosion of stainless steel, based on reactivation from the passive state. This suggested test method was verified on austenitic chromenickel steels with increased carbon content and cold deformation. The ratio of charge during reactivation to that in the active region of the polarization curve (at increasing potential), expressed as a percentage, appears to give the optimum quantitative criterion of the tendency of steels to intercrystalline corrosion or intergranular stress corrosion cracking. The sensitivity of the method can be adjusted for the individual types of steels and alloys by changing the experimental conditions.     

王仲仁教授简况

<正> 王仲仁教授1934年5月出生于江苏省阜宁县,1947年到1951年曾在扬州中学、泰州中学及无锡市一中学习,1951年考入华北大学工学院(北京理工大学前身),1952年开始到新创建的北京钢铁学院(现北京科技大学)学习直至毕业。1955年到1957年在哈尔滨工业大学压力加工系研究生班学习,毕业后留校任教至今。     

Some Impressions of Electroplating in U.S.A.

The development of electrochemical machining methods is described and it is shown how the original process was improved by the introduction of automatic methods of controlling the inter-electrode distance and by pressure-feeding the electrolyte. Factors of importance in governing the rate of metal removal and controlling the shape of the workpiece are detailed and illustrated by reference to electrode design, electrolyte composition and filtration methods.     

ICP-AES法同时测定金属镁中的铁硅铜铝镍锰

本文研究了在一定溴存在的条件下 ,试样以盐酸与硝酸溶解 ,用ICP—AES同时测定金属镁中Fe、Si、Cu、Al、Ni、Mn六种元素。为消除大量镁基体的干扰 ,本方法采用镁基做工作曲线 ,测定结果令人满意 ,完全可满足产品分析要求 ,方法简便可靠。     

Professor R. N. Parkins Receives Whitney Award from N.A.C.E.

Abstract

In situ metallography has been used to study the effect of temperature on the microstructural changes on the outside surface of primary reformer tubes, used for the production of reformed gas suitable for ammonia synthesis in a 200 tonnes per day capacity ammonia plant. The outside skin temperature varied in the range of 860° to 1050°C. The studies indicated marked changes with increasing temperature in the size of grains and carbide morphology, i.e., the pattern and distribution of primary and secondary carbides.     

A.I.D. Testing and Application of Aircraft Finishes

The introduction of quaternary pyridinium derivatives as brightening agents for the electrodeposition of zinc from alkaline electrolytes was one of the most significant recent advances in this field. This work describes the brightening effect of quaternary pyrindium derivatives, which have differences in structure, on the zinc deposits obtained from alkaline cyanide and alkaline non-cyanide electrolytes. Chemical changes were found to be occurring to these organic compounds when used as addition agents in these electrolytes, which could be followed using ultra violet spectroscopy. Analysis of the data has enabled the kinetics of these reactions to be deduced and this together with relevant informaton from the literature has enabled the identity of the new species to be established.     

无模液压胀形技术——王仲仁教授的一项发明

介绍了无模液压胀形技术的基本原理和主要工序,对无模液压胀形技术发明以来的几个重要发展阶段进行了阐述,并对球形容器、椭球及环壳的无模液压成形过程进行了数值模拟,给出了壳体的成形规律,同时对壳体成形过程中存在的缺陷进行了准确的预报,最后给出了该技术在实际工程中的具体应用实例。     

Presentation of the U.R. Evans Award for 1983 to Professor G. C. Wood

Abstract

Prominent examples of inhibitors recommended to protect metallic materials, especially ferrous metals and alloys, from corrosion in hydrochloric, sulphuric, nitric, hydrofluoric, phosphoric, sulphamic, citric, acetic, hydroxyacetic or formic acid or ammonium bifluoride, during acid pickling, scale removal, acid cleaning or oil and gas well acidizing, are discussed with respect to the individual problems connected with the technical applications of these various kinds of acid treatment. The structures of organic inhibitors are given including N-containing compounds (amines, Mannich bases, alkynoxymethylamines, ammonium compounds heteroaromatics, oximes, nitriles, nitro compounds), acetylenic alcohols, S-containing compounds (mercaptans, thioethers, sulphonium compounds, sulphoxides, thioureas, thiocyanates, heteroaromatics, etc.) and complexones.     

T.I.M.E.焊工艺与高效MAG焊的发展

介绍了Ｔ．Ｉ．Ｍ．Ｅ．焊工艺的特点、工艺本身对焊接设备的要求以及此工艺在国内外的研究现状和高效ＭＡＧ焊的发展趋势。     

E. I. Malinkina and V. N. Lomakin The hardenability of steel

Metal Science and Heat Treatment -     

Simulation of formation of disoriented structures in deformation of f.c.c. materials

It is shown that nuclei of dislocation walls can be formed due to the dynamic loss of stability of a dislocation cluster near the boundaries of a shear zone. A mathematical model is suggested for describing the kinetics of the defect medium that consists of dislocations and dislocation walls. The phase diagrams of dislocation density versus disclination density exhibits various stationary states, namely, a saddle, a stable node, and a limiting cycle of complex structure. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 9–12, April, 1998.     

对当前美国无缝钢管OCTG市场价格的剖析

随着国际原油价格的不断上涨,美国加大了本土原油的开采力度,引发了对无缝钢管OCTG的需求变化。无缝钢管OCTG的价格随着原油价格的起伏波动,2004～2006年美国OCTG价格持续走高。运用统计学原理分析可知近年来美国无缝钢管OGTC价格2、3季度较高,4季度价格最低。随着中国出口到美国无缝钢管OCTG数量的不断增长且价格偏低,有可能引发美国提起反倾销诉讼,这应当引起国内同行的注意。     

Multi-scale modeling of low-temperature deformation in b.c.c. metals

The deformation of body-centered cubic (b.c.c.) metals such as W, Ta, and Mo is complicated both by complex deformation mechanisms at the atomic scale and by microstructural variations at the microscale. In this paper, we develop a multiscale model for low-temperature deformation in b.c.c. metals. This model integrates atomic-scale observations into a single crystal constitutive relationship that is implemented in a polycrystal plasticity grain-scale simulation. We determine that the details of deformation at the microscale differ substantially between b.c.c. and f.c.c. metals.