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.     

Steelmaking / U.S.A.

Part II of a four-part series on the history of steelmaking in the US, points out the inadequate safety and living conditions that existed in steel mills at the turn of the Century. Also defined are furnace and process developments.     

Steelmaking / U.S.A.

The history of steelmaking in the United States is a fascinating story of determination, sudden tragedy, exploitation, and inventive genius rolled into one gigantic plot. Mr. Reinartz’ flowing interpretation of the progress made in the last one hundred years is being presented in a series of four articles.     

艾福表面处理技术（上海）有限公司

阿可／舍舍夫、Tufftride／Tenifer／Melonite／QPQ是法国H．E．F．集团和其Durferrit子公司开发的盐浴表面技术，经过不断发展现已成为无污染的可控液体离子渗氮CLIN（Controlled Liquid Ionic Nitriding）技术。适用于提高钢铁工件表面硬度，耐磨性，抗咬合，抗疲劳性和耐腐蚀性场合。     

Steelmaking / U.S.A.

Part III of a four-part series on the history of steelmaking in the US, describes furnace developments, improvements during the last few decades, and the contribution of the AIME.     

Steelmaking / U.S.A.

This is the fourth and final installment of Leo Reinartz’ summation of the steelmaking industry over the first one hundred years.     

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.     

Clad Metal Technology in the U.S.S.R.

This article examines the various aspects of cladding processes used in the Soviet Union as well as research into surface preparation, interface layer selection, clad-core property differences, layer thickness ratio, and temperature on cladding response. Post-formed properties, such as bond strength, and typical clad products are also discussed.     

我国石油专用管材的发展方向

随着我国石油钻井技术的发展，石油专用管材的生产、技术、质量及装备水平有了长足的进步。但因石油管材的产品性能要求高，加之接箍丝扣结构性能要求严格，因此生产难度大，国产化问题尚待解决。分析了我国石油专用管材的生产现状及存在的问题，指出了国产石油专用管材的发展方向。     

A 19F.N.M.R. study of graphite fluorosulfates

Graphite fluorosulfates, C_nSO₃F, with n = 7 for stage-one materials, are ideally suited for ¹⁹F n.m.r. studies due to the unambiguous identity of the intercalate and its axially symmetric nature. The intensity of the signal shows a clear dependence on the orientation of the c axis with respect to the oscillating radio-frequency field H₁. The chemical shift value, however, is affected by the orientation of the c axis with respect to H₀. The powder spectrum of the stage-one material C₇SO₃F extends from 10 to 100 ppm at low temperatures, while motional narrowing at room temperature contributes to a sharp signal at the lower field end of the powder spectrum, corresponding to an axially symmetric chemical shift tensor. Angular dependence studies on C₇SO₃F samples made from HOPG indicate that the majority of the intercalated SO₃F⁻ ions are oriented with their molecular C₃ symmetry axes parallel to the c axis of graphite, or normal to H₀. Multi-staged samples made from HOPG demonstrate the stage dependence of the chemical shift of intercalated SO₃F⁻ ions. The chemical shift of the stage-one material is observed in the region of 10 – 12 ppm, while higher-staged materials show resonances at less shielded regions.     

采用步进梁式加热炉的油井管调质生产线

由于油井管的工作条件非常恶劣,因此对其综合力学性能要求较高。要达到所需的力学性能,一般要对其进行调质处理。介绍了采用步进梁式加热炉的油井管调质生产线及所采用的先进工艺、先进装置、先进技术和其使用效果。     

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。