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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.3

martie

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

Mândru Călaie, Maria Nicolae, Avram Nicolae: Unele elemente ale studiului de viabilizare a unei miniuzine siderurgice…….5

Maria Nicolae, Avram Nicolae, Vasile Şerban: Interacţiuni între bioxidul de sulf generat în procesele siderurgice şi corpurile dispuse în mediul metalurgic .................................................11

Vasile Bratu: cercetări privind stabilirea unor corelaţii între parametri tehnologici la simularea turnării continue a oţelului …....16

Gheorghe Chiţu: cercetări asupra gradului de prelucrare a oţelului în siderurgie………………………………………...…………....…..20

Sorin Dobrovici, Nelu Cazacu: Comportarea oţelului 18MnCr10 la carbonitrurarea în strat fluidizat ......…………………..…….29

Nicolae-Sorin Păun: Calculul randamentului de matificare a cuprului la topirea pentru mată în cuptorul cu vatră .....………....……33

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

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

+ Ştire de presă ………………………………………...……….………….........................….…………..V

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

+Rezumate …………………………………………................……………………………...………...VIII

+ Evenimente internaţionale …………………….................…………..……….……….…..XI

ª Congrese-Expoziţie-Forum-Conferinţă-Târguri……..............…………………….…XI

+ Societatea română de biomateriale (selecţiuni din comunicări ştiinţifice )........……….......XIII

+ Cărţi apărute la Editura Ştiinţifică F.M.R……………..…………..…….………............XVIII-XX

+ Revista Revistelor …...............…………………………………………10, 19, 28, 39, II, IV, VII, XII

abstract metalurgia 3/2004

D.C.: 669.1

Mândru Călaie, Maria Nicolae, Avram Nicolae: Some elements of restructuring study for a mini steel plant

Metalurgia (56) 2004, nr.3 p.5

The paper is destinated to establish the required activities and measures in order to restructure a Romanian iron and steel company, having the following product mix in 2001:

crude steel: 376,000 tons;
finished rolled products: 212,000 tons;
billets for seamless tubes: 105,000 tons.

The restructuring strategy includes:

Industrial restructuring: investment volume, product mixt, market;
Financial restructuring: steps intended to be performed for financial economic recovery;
Social restructuring: labour force evolution, correlated to industrial and financial restructuring.

This paper has to be linked to two other papers published in previous issues of periodical „Metalurgia”.

D.C.: 574; 628-5; 66.02

Maria Nicolae, Avram Nicolae, Vasile Şerban: Interactions between sulphur dioxide, generated during iron and steel metallurgical processes and bodies situated in metallurgical environment

Metalurgia (56) 2004, nr.3, p.11

Engineering activities in the field of environment control are destinated to:

analysis of status down stream of metallurgical processes (identification, measuring and dispersion of emissions, and secondary materials utilisation);
investigations regarding emissions in the metallurgical processes contour are not yet completely finalized.

Taking into account the aspects presented above, some steps have to be performed:

intensification of efforts regarding environment profilaxy, based on knowledges of theory of industrial generation of effluents;
to establish the mathematical instruments required in order to predict the quantity of effluents to be generated by basical metallurgical processes and auxiliary operations.

D.C : 669-1/-9-147

Vasile Bratu: Investigations regarding finding aut of correlations between process parameters during steel continuous casting simulation

Metalurgia (56) 2004, nr.3, p.16

D.C.: 669.14-131

Gheorghe Chiţu: Investigations regarding manufacturing level of steel in the iron and steel industry

Metalurgia (56) 2004, nr.3, p.20

In order to increase the efficiency in the iron and steel industry, the Romanian Metallurgical Research Institute (ICEM) performed comparative analysis regarding the world-wide and Romanian iron and steel industries.

Results of investigations indicate an increasing with minimum 100 USD/ton of efficiency, if manufacturing level of steel is improved. Modernisation and restructuring of iron and steel industry is required in order to diminish the gap as compared to world wide and EU levels.

D.C.: 669.15

Sorin Dobrovici, Nelu Cazacu: Behaviour of 18MnCr10 steel under carbonitriding in fluidized bed

Metalurgia (56) 2004, nr.3, p.29

Fluidized bed is favorable properties for heat and thermo chemical treatment. The mass and heat transfer coefficient having higher values. Experiments for carbonitriding in fluidized bed was made in laboratory conditions and we used different low alloy steel samples. In this paper is showing some aspects concerning the carbonitriding experiments in atmosphere based on methane and ammonia.

D.C.: 669./21.; 669.35

Nicolae-Sorin Păun: Calculation of extraction yield of copper during melting in open hearth furnace

Metalurgia (56) 2004, nr.3, p.33

The way to calculate the extraction of copper during melting in open hearth furnace base don metall losses during the process is presented. The losses are evaluated taking into account thermodynamic data.

The advantage of the method is the calculation of yields, as compared to average of operation data, as usually people do in the factory.