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Metalurgia

revistă fondată în 1948

Revistă editată de editura ştiinţifică f.m.r.

preşedintele onorific al

editurii ştiinţifice f.m.r.

Dr. Ec. Lepădatu V.Gheorghe

Nr.1

ianuarie

2005

preşedinTii colegiilor de

redacţie

Prof. dr. ing. NICOLAE AVRAM

Prof. dr. ing. SCORŢEA COSTIN

colegiul onorific

(în ordine alfabetică)

I.Ågren (Suedia), dieter ameling (GERMANIA), borş ionel, bordea marius,

chiriac cornel, constantin radu, dobra gheorghe, dumitrescu constantin,

R. S. HOUK (S.U.A.), T.Y.Hsu (China), ioan romulus, christopher lawson (danemarca),

y. matsubara (Japonia), moldovan petre, nicolae avram, D. R. J. OWEN (SWANSEA, UK),

radu nicu, roşescu gheorghe (grecia), roxana ruxandra (california),

sofroni laurenţie, Jean-marc saiter (franţa),tudor paul, văzdăuţeanu vasile

Preşedinte al colegiului executiv de redacţie

Prof. dr. ing. SCORŢEA COSTIN

Colegiul executiv

Prof. dr. ing. bejan Mircea

Prof. dr. ing. bunea Daniel

Prof. dr. ing. cănănău nicolae

Prof. dr. ing. GEORGETA COŞMELEAŢĂ

Prof. dr. ing. CIUCĂ ION

Prof. dr. ing. gaba aurel

Prof. dr. ing. GĂLUŞCĂ DAN GELU

Prof. dr. ing. hepuţ teodor

Prof. dr. ing. IONIŢĂ GHEORGHE

Prof. dr. ing. mănescu tiberiu

Conf. univ. dr. ing. TODERIŢA NEMEŞ

Prof. dr. ing. samoilă Corneliu

Prof. dr. ing. SCORŢEA COSTIN

Prof. dr. ing. SIMITI IOAN VIDA

Prof. dr. ing. SOFONEA GALAFTION

Prof. dr. ing. Şaban Rami

Corpul referenţilor ştiinţifici

Prof. dr. ing. anişoara ciocan, Prof. dr. ing. Crişan Aurel,

Prof. dr .ing. Miloşan Ioan, Prof. dr. ing. constantin Nicolae,

Prof. dr. ing. Nagy Emil, Prof. dr. ing. Maria Nicolae,

Prof. dr. ing. Tamara radu, Prof. dr. ing. Doina Răducanu,

Conf. dr. ing. Semenescu Augustin, Prof. dr. ing. Vizureanu Petrică

Director General Editura Ştiinţifică F.M.R.

Redactor Şef. Ing. BRÂNDUŞA FLORENTINA SCORŢEA

Asistent Editura Ştiinţifică F.M.R.

Procesare -tehnoredactare:

ANCA ION

SUMAR ISSN 0461-9579

scorŢea Costin: Comparaţie între uzina siderurgică românească de la Galaţi şi uzinele siderurgice similare din Franţa, producătoare de produse plate – Dunkerque şi FOS-sur Mere ………………………………………………………………………..5

Butnariu Ilie, Ştefănoiu Radu: Teorii privind locul de desfăşurare a reacţiei de decarburare la afinarea băilor metalice înalt aliate cu crom şi conţinut scăzut de carbon prin procedeul duplex (CAE + VOD) ..……………………….……………9

Munteanu Sorin Ion, Ciobanu Ioan, Crişan Aurel: Particularităţi privind solidificarea barelor cu secţiune „U” cu deschidere îngustă între braţele paralele ……………………………………………………………………….…………………15

Mirela SOHACIU: Predicţionarea unor funcţii obiectiv la înlocuirea fierului vechi cu materiale pulverulente ...........................................................................................................27

Alexandru Petrică, Elena Drugescu: Modelarea transformărilor de fază din oţelurile supuse tratamentelor termice ……………………………………..................................33

Florentina Potecaşu, Potecaşu Octavian: Rolul defectelor de material asupra comportării la coroziune a unor repere din industria navală ........................................42

Ana Veteleanu: Protecţia anticorozivă a oţelurilor prin îmbogăţirea mixtă cu crom şi aluminiu ………………………………………………………………………………….48

+ Informaţii din metalurgia mondială ………………...…………………………………I

Ştiri ………………………………………………………………….……………………....II

+ Ştiri de presă ……………………………………………………………………...….III-V

+Semnalări …………………………………………………………..……………………VI

+Evenimente Internaţionale ……………………………..…….……………VII

ª Congrese-sesiuni .……………………………………………..…………….….VII

+ Indici de autor (revista Metalurgia 2004) …………………………………..………VIII

+ Cărţi apărute la Editura Ştiinţifică F.M.R ……………..……...........…....…XI-XIV

+ Revista revistelor ………………………………………….……14, 26, 32, 41, 47, V, X

abstract metalurgia 1/2005

D.C.: 621.771

scorŢea Costin: Comparison between Romanian Iron and Steel Complex of Galati and similar French steelworks of Dunkerque and FOS-sur Mere

Metalurgia (57) 2005, nr.1, p.5

D.C.: 669.26

Butnariu Ilie, Ştefănoiu Radu: Theories regarding places of decarburisation reaction during refining of high content of chromium and low content of carbon melts by CAE + VOD Duplex process

Metalurgia (57) 2005, nr.1, p.9

In this paper are presented various theories regarding the location in which the decarburization reaction takes place during oxidation period of the chromium high alloyed metal baths with low carbon content in case of the duplex (EAF-VOD) technology.

D.C.: 621.746.62

Keywords: mathematical model, solidification, simulation

Munteanu Sorin Ion, Ciobanu Ioan, Crişan Aurel: Particularities concerning the solidification of „U” bars with small opening between parallel arms

Metalurgia (57) 2005, nr.1, p.15

In this paper there are presented the results obtained by authors concerning the solidification of some bars with „U” section having a small distance between the parallel walls of the section. It was used the computer aided simulation method with a software based on a 2D finite differences mathematical model. The case of eutectic cast iron parts, cast in molding batch on the base of silica sand, cured with CO₂ , was analyzed.

D.C.: 574; 669.162; 621.745.44; 539.215; 620.191.32

Mirela SOHACIU: Prediction of some obiective functions tos crap substitute with powdere materials

Metalurgia (57) 2005, nr.1, p.27

This paper propose establishing of an objective function (the melt steel quality and process parameters) to powdered materials use (EAF dust, scale and slurry) as scrap substitute for steelmaking. It was studied the influence of some parameters, such as: EAF dust amount in charge and Zn and P content from EAF dust, being establish the assimilation ratio of P and Zn, scale amount influence on charge and Fe_tot content from scale and, also, the slurry amount on charge and Fe_tot content from slurry.

D.C.: 669.017.3

Alexandru Petrică, Elena Drugescu: The modelling of phases transformation for the thermal treatments submitted steels

Metalurgia (57) 2005, nr.1, p.33

A mathematical model, has been developed to

predict the interaction among temperature and phase transformations and applied to the water quenching for steel bars. The rate of transformation for the austenite-to-martensite reaction is calculated from a empirical relation (Koistinen-Marburger) and from a numerical method of interpolation for the transformation austenite-to-perlite, ferrite and bainite.

D.C.: 620.193.5

Florentina Potecaşu, Potecaşu Octavian: effect of material faults on corrosion behaviour of some parts, working in ship industry

Metalurgia (57) 2005, nr.1, p.42

The researches are based on the corrosion behaviour of the piping associated with the coolers for the main and auxiliary engines on shipboard Ferosa. Usually the cooler pipes are made from sea water-resistant standard Cu Ni alloys. However, an unproper behaviour to corrosion has lately been noticed, that is why the authors tried to find the causes of the piping corrosion. The experiments were made on a sea-going vessel the corroded pipes of which presented an abnormally short service life. The chemical tests performed on the pipe material (alloy 1 - the heat exchangers of the auxiliary engines; alloy 2 - the heat exchangers of the main engines) revealed a correct chemical composition in compliance with the requirements. Since the pipe corrosion was found to be uneven, samples were taken from several pipes and different pipe zones so that all aspects related to corrosion could be properly investigated. The micro and macrostructural analysis carried out on both corrosion attacked samples and corrosion - free samples, on the inner walls and on cross and oblique sections underlined the significant effects on any structural defects.

D.C.: 620.193; 669.26

Keywords: corrosion, chromizing, aluminizing, chromo-aluminizing, diffusion, deposition

Ana Veteleanu: The anticorrosive protection of steels through the mixed enrichment with chromium and aluminium

Metalurgia (57) 2005, nr.1, p.48

The increase of resistance to corrosion in various environments of steels can be obtained through various procedures. The present paper deals with the analysis of the behaviour to corrosion of steels that are superficially covered through diffusion with chromium, aluminum and chromium-aluminum.By means of forming a mixed covering, there is an improvement both in the resistance to corrosion as well as in other characteristics of exploitation such as persistence and resistance to thermal shocks.