Advanced sheet steels for automotive applications

Abstract

Vacuum degassing has recently been used by sheet steel producers to improve their products' ductility and strength. Carbon contents can be reduced by an order of magnitude to less than 0.0030 wt. %. Through careful alloying and processing, a range of new steel products has been developed for the automotive industry. These products include interstitial-free, deep-drawing-quality steels; formable, high-strength, interstitial-free steels; and bake-hardenable steels. This article summarizes the chemistry and processing needed to produce these products.

Öndeformasyon ve Fırınlama Sıcaklığının Fırınlama Sırasında Şertleşen Çeliklerin Sertleşme Özelliğine Etkisi

“…Boyanmış dış gövde saclarının fırınlanması sonrasında da gözlenen bu olgu S biçimlendirilme sonrasında malzemenin akma dayanımında arzu edilen artışı ortaya çıkarmaktadır. Burada vurgulanması gereken önemli bir nokta, sorunsuz bir biçimlendirme için preste biçimlendirme öncesinde ortaya çıkan yaşlanma olgusu yeterince bastırılmalıdır [4,7] Arzu edilen özellikler fırınlama sırasında sertleşen (FSSen) çelik ile elde edilmiştir. FSSen bir çelik sac, preste biçimlendirme işlemini takip eden 170 o C'deki 20 dak.…”

Influence of Al/Ti Ratio in Ti-ULC Steel and Refractory Components of Submerged Entry Nozzle on Formation of Clogging Deposits

“…2) Ti is added in the steel by charging ferro-Ti alloy or Ti sponge during a RH process. 3) However, it has been a longstanding problem that increasing Ti content leads to severe clogging of Submerged Entry Nozzle (SEN) during Continuous Casting (CC). [4][5][6][7][8][9] Deposits causing a nozzle clogging during the CC of Ti-ULC steel is different to those found during CC of Ti free-ULC steel.…”

Dissolution kinetics of alumina in molten CaO–Al2O3–FetO–MgO–SiO2 oxide representing the RH slag in steelmaking process

“…Ultra‐low C (ULC) steel is one of representative grades of the steel. Due to its excellent formability, it is often used where a severe deformation is required such as an outer panel of automotive . The final form of the steel product is a deformed thin sheet, appearing the exterior of the automotive.…”

“…Due to its excellent formability, 1 it is often used where a severe deformation is required such as an outer panel of automotive. 2 The final form of the steel product is a deformed thin sheet, appearing the exterior of the automotive. Therefore, surface quality without any defect (eg, sliver, blister, hole) is important.…”

“…where Δ(%Al 2 O 3 ) is a difference between (%Al 2 O 3 ) sat and (% Al 2 O 3 ) in the bulk slag. Integrating Equation(2) assuming that k m A∕V does not change, the following equation is obtained:…”