Programações - ABM Brasil

OPTIMIZATION OF THE CUTTING CLEARANCES FOR PLATE EDGES QUALITY IMPROVEMENT IN THE SHEAR LINE OF THE GERDAU OURO BRANCO PLATE MILL

Per: Ronaldo Esteves Ribeiro (GERDAU), José Herbert Dolabela da Silveira (GERDAU), Warley da Silva Horta (GERDAU), Jefferson Felipe Faria Clemente (GERDAU), Douglas Clemente Silveira (GERDAU), Carlos Victor Francisco Ferreira dos Santos (GERDAU), Guilherme Valentin da Silva Santiago (GERDAU)

Area: Ferrous and Non Ferrous

Theme: Plate Mills

Event: IRC 2019

Type: Oral

Date and time: 02/10/19 | 14h00

Room: 12

Abstract:

MATHEMATICAL MODELLING OF THERMAL EVOLUTION AS A TOOL FOR ENHANCING STEEL ROUGH ROLLING

Per: Antonio adel dos santos (usiminas)

Area: Ferrous and Non Ferrous

Theme: Mathematical Modeling and Simulation

Event: IRC 2019

Type: Oral

Date and time: 02/10/19 | 14h00

Room: 13

Abstract:

EFFECT OF AUSTENITE GRAIN SIZE ON THE BAINITIC TRANSFORMATION IN A HOT-ROLLED LOW CARBON MICROALLOYED STEEL

Per: junjun cui (State Key Laboratory of Rolling and Automation, Northeastern University), wenting zhu (State Key Laboratory of Rolling and Automation, Northeastern University), LIQING CHEN (State Key Laboratory of Rolling and Automation, Northeastern University)

Area: Ferrous and Non Ferrous

Theme: Thermomechanical Processes, TMCP

Event: IRC 2019

Type: Oral

Date and time: 02/10/19 | 14h00

Room: 14

Abstract:

COST REDUCTION AND BETTER QUALITY CONTROL BY ON-LINE ROUGHNESS MEASUREMENT DURING CONTINUOUS STRIP PROCESSING - SORM3PLUS

Per: anderson rosa pereira (emh)

Area: Ferrous and Non Ferrous

Theme: Strip Cold Rolling, Annealing and Coating Processes

Event: 56th Rolling

Type: Oral

Date and time: 02/10/19 | 14h00

Room: 15

Abstract:

RHEOROLLING OF ALUMINIUM ALLOY A413 TO PRODUCE CONTINUOUS METALLIC STRIPS

Per: PEDRO BARBOSA DE OLIVEIRA NETO (CAMPUS DE ILHA SOLTEIRA), Lucas veronez goulart ferreira (unesp ilha solteira), antonio de pádua lima filho (unesp ilha solteira), MIGUEL BORODIAK (COMPANHIA BRASILEIRA DE ALUMINIO)

Area: Ferrous and Non Ferrous

Theme: New Rolling Processes

Event: IRC 2019

Type: Oral

Date and time: 02/10/19 | 14h00

Room: 16

Abstract:

Rheorolling is a novel technology to manufacture metallic strip. This process saves energy because the material is formed in semisolid state demanding less power from the rolling mills, i.e., no robust equipment is required and many stages of traditional rolling can be suppressed. The typical coarse cast structure of ingoting and continuous casting products is refined by hot rolling. On the other hand, rheorolling processing refines microstructure by the high heat transfer during processing of the strip. Furthermore, during forming of the semisolid state, shear stress acts degenerating the dendritic morphology. Thus, globular structure occurs increasing the mechanical properties. The rheorolling requires minor separation force between the rolls in comparison with the traditional forming processes. Al-Si A413 alloy is usually processed via die casting. This alloy is not suitable to obtain metallic strips by forming because of the brittle Si particles, in such a way that rheorolling process can become this viable. In this work, Al-Si A413 alloy was melted and poured at 680 ºC on a cooling slope to obtain the semisolid material feeding the ceramic nozzle (150 cm³) at the lower roll. The two rolls of the roll stand are separated with a gap of 1.5 mm, have approximately 105 mm in diameter and are made of carbon steel. The chill/columnar layer formed at the lower roll drags the metallic slurry at a rate of 0.2 m/s to be formed by the upper roll, obtaining a metallic cast strip with a thickness of 2 mm, approximately. Three conditions were applied to test the continuity of the process: 1) Roll stand without any mechanism to reduce the pressure on the metallic slurry; 2) Roll stand with springs attached on the upper roll in order to reduce the separation force between the rolls; and 3) The upper roll as modified with springs and the lower roll internally cooled by soluble oil in order to increase the heat transfer. The first situation did not work properly due to the sticking of the strip onto the lower roll. The second condition was successfully performed obtaining a continuous metallic strip. The last condition failed due to complete solidification of the melt alloy between rolls and at the ceramic nozzle. This indicates a lack of fluidity of the metallic slurry promoting premature solidification in the processing.