MACROSCOPIC INVESTIGATIONS OF THE PRIMARY STRUCTURE OF CONTINUOUS CASTING INGOTS

Zdzisław Kudliński,Krystian Janiszewski

doi:10.12776/ams.v20i2.310

Abstract

This paper presents the results of macroscopic investigations of the structure of continuous casting ingots depending on the kinetics of solidification and speed of casting of low carbon steel intended for welding wires. We have determined the Lk length of solidification path of ingots of 140 x 140 mm cross-section. We have also performed macroscopic investigations of the ingot structures together with identification of shrinkage porosity defects and axial porosities. microscopic investigations of axial ingot zones, areas of shrinkage defects and axial porosity, have demonstrated that the non-metallic phase (silicates and aluminates) presented there stands in the way of welding during the process of rolling of continuously cast ingots.

Highlights

Defects of the primary structure of continuous casting ingots, including porosity and axial shrinkage defects, occurring concurrently with typical zones of crystallizations, are their important components, which form the non-continuity zones in the material
The occurrence of wire breakage observed in the process of wire drawing from the rolled material produced of the continuous casting ingots, is the result of the shrinkage porosity defects and axial porosity
The CSC machine used in casting of the investigated square ingots, have had the following design characteristics [14-17]: length of the secondary cooling zone Lh= 9,5 m metallurgical length Lm = 29,7 m distance of the ingot straightening 13,7 m from steel table in the crystallizer, recommended ingot casting speeds for 140x140 mm products, Vodl= 3,1- 3,4 m/min

Summary

MACROSCOPIC INVESTIGATIONS OF THE PRIMARY STRUCTURE OF CONTINUOUS CASTING INGOTS

Zdzisław Kudliński1), Krystian Janiszewski2)* 1) Silesian University of Technology, Department of Materials Science and Metallurgy, Institute of Metallurgical Technology Katowice, Poland 2) Silesian University of Technology, Department of Materials Science and Metallurgy, Institute of Metallurgical Technology, Katowice, Poland

Introduction

Length of ingot solidification path LK

Conclusions