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Title

DEVELOPMENT OF CR AND V ALLOYED HIGH CARBON SHEET STEEL (BW BL 50CRV4) AT ARCELORMITTAL TUBARÃO AND BRASMETAL WAELZHOLZ FOR DIAPHRAGM SPRING

Authorship

Ferreira, Fernando Generoso Neiva; Henriques, Bruno Rodrigues; Machado, Eduardo Alves; Barbosa, Fabiano Almir; Cajano, Felipe Ferreira; Possati, Juliano Braz; Barroso, Marina de Lima; Bomfim, Maurício Franco

Ferreira, Fernando Generoso Neiva

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Henriques, Bruno Rodrigues

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Machado, Eduardo Alves

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Barbosa, Fabiano Almir

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Cajano, Felipe Ferreira

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Possati, Juliano Braz

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Barroso, Marina de Lima

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Bomfim, Maurício Franco

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DOI

10.5151/9785-9785-32226

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Abstract

Spring steels are usually classified as medium to high carbon low alloy steels with very high yield strength, enabling the part to return to its original shape regardless of significant bending or twisting. Despite the fact that plain carbon steels are suitable for small springs, larger and high performance springs usually requires alloy steels such as Cr-V or Si-Mn in order to achieve an even microstructure throughout the cross section. Clutch diaphragm spring is a high performance part that requires very good cleanliness and microstructure homogeneity, thus requiring an alloy steel. In this paper was studied, in an industrial scale, the process parameters and critical characteristics for the development of a Cr and V alloyed high carbon sheet steel for the production of clutch diaphragm spring. The steel was characterized throughout the entire process (casting, hot rolling, cold rolling + batch annealing and heat treated) using tensile test, hardness test, optical microscopy (OM) and scanning electron microscopy (SEM) to assess the mechanical and metallurgical properties of the studied steel. The results have shown the material’s microstructure evolution after each main stage of the process, from a ferrite-bainite/perlite based microstructure as hot band to fully spheroidized as cold-rolled/annealed and then fully martensitic as ready-to-use part.

Keywords

High carbon sheet steel, 50CrV4, Diaphragm spring, ArcelorMittal Tubarão, Waelzholz Brasmetal.