ISSN 2594-5297
58º Seminário de Laminação, Conformação de Metais e Produtos — vol. 58, num.58 (2023)
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Flatness control of advanced high-strength steels (AHSS) is a major challenge for high-quality steel production in a Hot Strip Mill (HSM). Among the most critical materials, there are those with ultimate tensile strength above 980 MPa, such as dual phase (DP1000) and complex phase (CP1000) steels for the automotive sector. These materials in some circumstances exhibit residual stresses resulting from phase transformation during cooling, leading to flatness oscillations. To improve the shape is often used the Hot Skin Pass (HSP), where the material undergoes to roller leveling and work hardening steps. Thus, a systematic investigation was conducted, with a multidisciplinary team, aiming to improve flatness control in hot rolled AHSS. Laboratory investigation was performed to understand the edge wave generation mechanisms, using Tensile Tests, Optical Microscopy (OM), and Scanning Electron Microscopy (SEM). Furthermore, through monitoring the AHSS manufacturing process in the HSM and HSP lines, it was possible to enhance the knowledge regarding the edge wave generation and to propose a modification in the HSP roll crown, aiming to improve the effectiveness of strip flatness correction. The project actions resulted in improved CP/DP1000 flatness control, as well as enhanced stability in the cold rolling process.
Flatness control of advanced high-strength steels (AHSS) is a major challenge for high-quality steel production in a Hot Strip Mill (HSM). Among the most critical materials, there are those with ultimate tensile strength above 980 MPa, such as dual phase (DP1000) and complex phase (CP1000) steels for the automotive sector. These materials in some circumstances exhibit residual stresses resulting from phase transformation during cooling, leading to flatness oscillations. To improve the shape is often used the Hot Skin Pass (HSP), where the material undergoes to roller leveling and work hardening steps. Thus, a systematic investigation was conducted, with a multidisciplinary team, aiming to improve flatness control in hot rolled AHSS. Laboratory investigation was performed to understand the edge wave generation mechanisms, using Tensile Tests, Optical Microscopy (OM), and Scanning Electron Microscopy (SEM). Furthermore, through monitoring the AHSS manufacturing process in the HSM and HSP lines, it was possible to enhance the knowledge regarding the edge wave generation and to propose a modification in the HSP roll crown, aiming to improve the effectiveness of strip flatness correction. The project actions resulted in improved CP/DP1000 flatness control, as well as enhanced stability in the cold rolling process.
Palavras-chave
AHSS; Hot Strip Mill; Hot Skin Pass; Flatness
AHSS; Hot Strip Mill; Hot Skin Pass; Flatness
Como citar
Loiola, Bruna Helena Malovini;
Barbosa, Jônatas Venancio;
Bahia, Jean Viana.
FLATNESS CONTROL IN HOT ROLLED ADVANCED HIGH-STRENGTH STEELS
,
p. 750-761.
In: 58º Seminário de Laminação, Conformação de Metais e Produtos,
São Paulo,
2023.
ISSN: 2594-5297
, DOI 10.5151/2594-5297-39691
