Investigation of Production Technology for Hot-Rolled High-Strength Low-Alloy Automobile Sheet Steels to Improve Properties and Quality Indices at Reduced Cost

Зайцев, А. И.; Dagman, A. I.; Koldaev, A. V.; Stepanov, A. B.; Kovalev, D. A.

doi:10.1007/s11015-023-01465-9

Cited by 1 publication

(1 citation statement)

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“…Comparatively, the manufacturing process of hot-rolled steel involves heating a billet to a temperature above the material’s recrystallization temperature (>1000 °C), followed by continuous rolling, extrusion, forging, and production. Throughout this entire process, both the shape and size of the material undergo significant changes [ 19 , 20 , 21 , 22 , 23 , 24 ]. Hot-rolled steel offers advantages such as relatively easy rolling and a high rolling efficiency.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Anti-Corrosion Properties of Different Types of Press-Hardened Steels

Peng,

Zhao,

et al. 2024

Materials

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Hot stamping (or press hardening) is a new technology that is widely used in the production of advanced high-strength steel parts for automotive applications. Electrochemical measurements, including potentiodynamic polarization and electrochemical impedance spectroscopy (EIS), and accelerated corrosion tests (the neutral salt spray test and periodic immersion test) were conducted on press-hardened samples produced from uncoated (cold-rolled and cold strip production (CSP) hot-rolled) and Al–Si-coated press-hardened steels to elucidate their distinct anti-corrosion mechanisms. The cross-sectional micromorphology and element distribution of three types of press-hardened steels after a neutral salt spray test were observed using scanning electron microscopy (SEM) and energy-dispersive X-ray analysis (EDAX). The corrosion resistance of Al–Si-coated press-hardened steel was found to be significantly diminished following the hot stamping process due to the presence of microcracks and elevated iron content in the coating subsequent to austenitizing heat treatment. On the other hand, the corrosion resistance of uncoated press-hardened sheets produced from cold-rolled and CSP hot-rolled press-hardened steel was found to be proximal due to their nearly identical composition and microstructure (fully martensite) after the hot stamping process. Considering the high efficiency and energy-saving properties of hot-rolled press-hardened steel, it holds the potential to replace cold-rolled and even aluminum–silicon-coated press-hardened steel in automobile manufacturing.

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