Medium carbon steel sheet and strip having enhanced uniform elongation and method for production thereof
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United States of America Patent
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Jan 6, 2004
Grant Date -
Jan 30, 2003
app pub date -
Aug 16, 2002
filing date -
Sep 1, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method is provided for producing medium carbon steel sheet and strip with enhanced uniform elongation for deep drawing applications. In one embodiment, a steel slab containing carbon 0.30/0.70%, manganese 0.75/2.0%, silicon up to 1.0% max., total aluminum 0.020/0.10%, the balance iron and incidental impurities is hot rolled to strip at a finishing temperature within the range of 839.degree. C. (1542.degree. F.) to 773.degree. C. (1424.degree. F.) and spheroidize annealed at a temperature below the A.sub.1 temperature. In a second embodiment, a steel slab containing 0.40 minimum/0.70% maximum carbon, 0.50/1.50% manganese, up to 1.0% silicon, 0.020/0.10% total aluminum, the balance iron and incidental impurities is hot rolled, cold rolled and spheroidize annealed, with various combinations of manganese and silicon within the above ranges providing lower yield strength at levels of 60 ksi, 70 ksi, and 80 ksi with minimum 14% uniform elongation.
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