Twin roll strip casting of low carbon steels

Abstract

The present paper describes the properties of low carbon steels in various processing states during the twin roll Strip casting of low carbon steels has been route. It is shown that composition adjustment can be an investigated using a laboratory twin roll machine efficient countermeasure against casting defects. The resulting with copper rolls. The following grades have been material properties are characterised not only by strength studied: a deep drawing low carbon (LC) steel, a LC and ductility but also with respect to r 90 value (a deep steel with titanium addition, and a high strength drawing parameter) and texture. low alloy (HSLA) grade. The casting behaviour of High strength drawing grades are also of interest for these steels has been examined, and the observed strip casting. To the authors' knowledge, no results from surface defects classified. Defects are most twin roll casting of such steels have been published before pronounced for the LC grade and significantly less the present investigation. The casting behaviour of the steels for the HSLA steel and the LC steel with titanium and expected strip properties are discussed. addition. The as cast structure has been analysed. It can be modified by post-cast treatment, e.g. by normalisation or in line rolling. The mechanical EXPERIMENTAL properties of cold rolled and annealed strip materialsThe steels investigated were produced at the Max-Planckand their textures are presented. Satisfactory sheet Institut (MPI) on a laboratory twin roll caster with a properties can be achieved both as hot band and furnace capacity of 70 kg. The material was induction melted, as cold rolled sheet when adequate treatment alloyed, aluminium killed, teemed into a ladle, poured into steps are applied. Consequences for strip casting a tundish, and passed through a ceramic filter into the applications and future research are discussed.submerged entry nozzle, which had two lateral outlets. The I&S/1498 superheat in the tundish, above the filter, was typically 20-50 K.

Plastic Anisotropy of Strip-Cast Low-Carbon Steels

“…[1][2][3] For further application to low carbon steels, the process has attracted many researchers to conduct relevant studies such as surface quality control, property improvement and so on. [4][5][6][7][8] These laboratory-or pilot-scale investigations and the process simulation have led to the fundamental understanding of the following microstructural features: the alleviation of the element segregation of P and Cu due to rapid solidification; 5,9) the austenite grains in an air-cooled cast strip to remain coarser than those of hot rolled strips; 10) and coarse and irregular ferrite grains in the as-cast strip. 4) However, not much data has been reported on the texture and formability of strip-cast low carbon steels.…”

“…However, this analysis seems to be too general to describe the similar relationship in the strip-cast low carbon steels with weak texture. 4,5,7) In the present study, the texture was characterized in detail by combining the orientation distribution function (ODF) and the orientation imaging microscopy (OIM) analysis to discuss the effects of the volume fractions of the principal texture components on the plastic anisotropy.…”

Twin Roll Casting of Steels: An Overview

“…Coarse austenite grains and high cooling rates in the ferrite formation zone are the main reasons to obtain the mentioned microstructure. 23,24) By adding a small amount of Ti (0.088 wt.%), the average grain size of irregular ferrite decreases to ~ 25 μm ( Fig. 9(b)) and some signs of dark pearlite grains become visible.…”

“…Chemical compositions of steels (wt.%); O and N in ppm; S and P were always ≤ 0.003 wt.%. 23) structure has been modified considerably compared to Fig. 9(b).…”

“…Twin-roll Casting of Low Carbon Steels 5.1.1.1. Effect of Titanium on TRC Strip Girgensohn et al 23) studied the properties of three different low carbon (LC) steels in various processing stages during twin-roll casting route using a laboratory twin-roll machine. Table 1 indicates the chemical composition of investigated steels in this research.…”