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Metalurgia

Revistă editată de editura ştiinţifică f.m.r.

preşedintele onorific al

editurii ştiinţifice f.m.r.

Dr. Ec. Lepădatu V.Gheorghe

       Nr.5

                                                                         mai

                                                                          2004

Preşedinte al colegiului executiv de redacţie

Prof. dr. ing. COSTIN SCORŢEA

colegiul onorific de redacţie

(în ordine alfabetică)

I.Ågren (Suedia), dieter ameling (GERMANIA),cornel chiriac, gheorghe chiţu, SORIN DIMITRIU,R. S.  HOUK   (U.S.A.),

T.  Y.  Hsu    (China), christopher lawson (danemarca), petru moldovan, D. R. J. OWEN (SWANSEA, UK),

laurenţie    sofronie, gheorghe roşescu (grecia),

Jean-marc saiter (franţa), ioan vârcolacu

preşedinTii CONSILIULui

sTIINTIFIC de redacţie

Prof. dr. ing. AVRAM NICOLAE

Prof. dr. ing. COSTIN SCORŢEA

Consilieri ştiinţifici

Prof. dr. ing. COSTIN SCORŢEA,

 Prof. dr. ing. MARIA NICOLAE,

Prof. dr. ing. DOINA RĂDUCANU,

Prof. dr. ing. Nicolae constantin,

Conf. dr. ing. AUGUSTIN SEMENESCU

Colegiul onorific  executiv de redacţie

Prof. dr. ing. Mircea bejan

Prof. dr. ing. Daniel bunea

Prof. dr. ing. ADRIAN DIMA

Prof. dr. ing. ION CIUCĂ

Prof.  ing.      DORIN DOBROVICI

Prof. dr. ing. teodor hepuţ

Prof. dr. ing. GHEORGHE IONIŢĂ

Prof. dr. ing. IOAN GIACOMELLI

Prof. dr. ing. tiberiu mănescu

Conf. dr. ing. PETRE  stelian NIŢĂ

Prof. dr. ing.  Tiberiu  Rusu

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

Dumitrescu Traian: Cercetări privind influenţa modificării asupra microstructurii, macrostructurii şi capacităţii de deformare plastică a oţelurilor……………………………………...……….…..5

Chiţu Gheorghe: Realizări în domeniul turnării continue la nivel mondial şi în România…………………………………………….12

Ecaterina Matei, Nicolae Avram: Efectul eficientizării epurării apelor industriale uzate de pe o platformă siderurgică, prin protejarea receptorilor naturali……………………………………………….22

Bordei Marian, Ciurea Aurel: Influenţa gradului de deformare asupra proprietăţilor oţelurilor la laminarea bramelor subţiri ……27

Ionescu Marian: Studii cu privire la importanţa economică a alierii oţelurilor rapide…………………………………………………….31

Mustaţă Ştefan-Mircea, Panait Nicolae, Vertan Horia-Petru, Antonescu Ciprian: Metodă neconvenţională privind obţinerea unor structuri multistrat cu destinaţie specială………………………….…….36

Mariana Pop: Tehnica prototipizării rapide, metodă de lucru în ingineria concurentă……………………………………………………………..39

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

+ Ştiri………………………………..………………...………….…...…..……….…...……………III

+ Arta în metalurgie ………………………………….………………………………………….....VI

+ Semnalări………..……………….……….…………………………………..…....…...….……...IX

+ Evenimente internaţionale …...………………………….………..……...….………..X

ª        Congrese-întâlniri-conferinţe-târguri-expoziţii………………………...…….……….X

+ Cărţi apărute  la Editura Ştiinţifică  F.M.R……………...……………...…..…….……XIII-XVI

+ Revista Revistelor …..……………………………………………………...…………11, 21, 30, 35

D.C.: 669.1.017;539.374

Traian Dumitrescu: Researches regarding effect of modification on microstructure, macrostructure and plastic deformation capacity of steel

Metalurgia (56) 2004, nr.5 p.5

In spite of deformation under laboratory conditions of white cast iron blocks into thin strips, under industrial conditions, plastic deformation of high alloy tool steels ingots represents still a difficult problem, due to low yield, because of cracking, thermal energy losses and low productivity. In some cases, processing of such steel is under efficiency limits. Plastic deformation weak capacity of such steels is duet o the existence of coarse macrostructure, with great columnar crystals, with extension up to the ingot center. Existence of such macrostructure is considered normal and is determined by heat dissipation from liquid steel to atmosphere, through ingot mould walls.

The present paper aims to establish the role of liquid steel modification on solidification process, and to establish in which extent the natural tendence to solidification is changed. Researches establish the strong effect of modification, having a result of pronounced finishing of microstructure and, of course, of macrostructure, aiming to delete the columnary zone crystals. Basically, modification can determine the transfer of tool steel from exaggerate fragility status in to very good plasticity status under hot conditions.

D.C.: 621.74.047

Gheorghe Chiţu: Last achievements in continuous casting field, both worldwide and in romania

Metalurgia (56) 2004, nr.5, p.12

Continuous casting process represents and efficient and less polutant technology. Romania is at present in delay as compared to developped countries.

Some suggestions are included in present  paper regarding the extensions of continuous cast steel grades in order to increase de competitiveness of different finished steel products: rolled, seamless tubes and drawn products.

D.C : 574;628.54;663.632

Ecaterina Matei, Avram Nicolae: Effect of waste industrial water cleaning efficiency in and iron steel complex, by natural receptors protection

Metalurgia (56) 2004, nr.5, p.22

D.C.: 539.374;621.771;669-412

Marian Bordei, Aurel Ciurea: Influence of the Deformation Degree on the Steels Properties During Thin Slabs Rolling

Metalurgia (56) 2004, nr.5 p.27

The rolling of the thin slabs directlly from the continuous casting – compared with the classical one – implies significant differences in the structural development, firstly shown during the solidification process. The specific processes to the thin slabs rolling directly from the continuous casting have to be analysed and checked in order to permanently reduce the fabrication costs and to rise the quality of the rolling products.

D.C.: 669.15-194.2

Marian Ionescu: Studies regarding the economical importance of rapid steel alloying

Metalurgia (56) 2004, nr.5 p.31

Requirement for production of rapid steel with lower production costs, by replacing expensive alloy elements with some other, cheaper, reprezents the main argument of studies prezented in the paper.

The results the manufacturing of steel with alloy base W-Mo or Mo, which could by allied with Si. Cutting tools base don these steel compositions were performed, having working proprieties very closed to the classical rapid ones.

D.C.: 620-186

Ştefan-Mircea Mustaţă, Nicolae Panait, Horia-Petru Vertan, Ciprian Antonescu: Nonconventional method of multilayer structures performance, with special purpose

Metalurgia (56) 2004, nr.5 p.36

These theme propose to treat some aspects about the utilization of the plackage by explosion method  in obtaining new materials with high properties used in the defence industry.

Key words: concurrent engineering, rapid prototyping, computer aided design

Mariana Pop: Quick prototypisation technique, working method in concurent engineering

Metalurgia (56) 2004, nr.5 p.39

                Rapid prototyping is one of the specific technics used in concurrent engineering. The aim of this paper is to present the principles of this method and also its advantages  in relation with the reducing  the time-to-market for a product.