Improving the properties of near net shape cast strip containing copper and tin from scrap
The limits of Cu and Sn from scrap in steel were investigated for applying near net shape casting techniques instead of the continuous casting line. Materials of LC steel DC 04, alloyed with up to 2.5 % Cu and up to 0.15 % Sn were cast in a twin roll caster (typical thickness 2 mm) or in a DSC caster (typical thickness 12 mm). They were inline hot rolled, a coil simulation was carried out, and after cold rolling of about 70 %, the final properties were established by batch or continuous annealing. The investigations of the final strip product focused mainly on the occurrence of hot shortness, the mechanical properties and the deep drawability. The study also investigated whether Cu in higher amounts, intentionally added, could be a desired alloying element in order to improve corrosion resistance and to increase strength. It was found that by using near net shape casting, the limits of Cu and Sn can be raised up to at least 0.5 % and 0.1 %, respectively, if the casting takes place in air. With reduction of the O2 content between caster and inline hot rolling mill, up to at least 1 % Cu may be tolerated. The properties relevant for deep drawability are sufficiently good if Cu content is < 0.5 % and Sn content < 0.1 %. Thus the scrap quality as defined in the European scrap grading system can be utilised if near net shape casting techniques are applied. If the requirement of deep drawability is omitted, a steel with improved strength and corrosion resistance may have up to 1 % Cu; its mechanical properties and weldability are very good.
Bibliographic Reference: EUR 22076 EN (2006), 121 pp. Euro: 25
Availability: Katalogue Number: KI-NA-22076-EN-S The paper version can be ordered online and the PDF version downloaded at: http://bookshop.europa.eu
ISBN: ISBN: 92-79-02076-5
Record Number: 200719300 / Last updated on: 2007-07-10
Original language: en
Available languages: en