THIN CAST STEEL STRIP WITH REDUCED MICROCRACKING

摘要

A THIN CAST STEEL STRIP (12) AND METHOD OF MAKING THEREOF WITH IMPROVED RESISTANCE TO MICROCRACKING IS DISCLOSED. THE STEEL STRIP (12) IS PRODUCED BY CONTINUOUS CASTING AND CONTAINS A CARBON CONTENT BETWEEN ABOUT 0.010% AND ABOUT 0.065% BY WEIGHT, LESS THAN 5.0% BY WEIGHT CHROMIUM, AT LEAST 70 PPM OF TOTAL OXYGEN AND BETWEEN 20 AND 70 PPM OF FREE OXYGEN, AND MANGANESE TO SULFUR RATIO GREATER THAN ABOUT 250:1. THE CARBON CONTENT IN THE CAST STRIP MAY BE BELOW 0.035%, LESS THAN 0.005% BY WEIGHT TITANIUM, AND THE AVERAGE MANGANESE TO SILICON RATIO IN THE STRIP PRODUCED MAY BE GREATER THAN 3.5:1. THE CARBON CONTENT MAY BE LESS THAN 0.035%, THE CASTING SPEED LESS THAN 76.68 METERS PER MINUTE, AND THE TUNDISH TEMPERATURE OF THE MOLTEN METAL IS MAINTAINED BELOW 1612°C (2933.7°F).