HOT ROLLED THIN CAST STRIP PRODUCT AND METHOD FOR MAKING THE SAME
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United States of America Patent
Stats
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N/A
Issued Date -
Nov 14, 2013
app pub date -
Jul 12, 2013
filing date -
Feb 20, 2009
priority date (Note) -
Published
status (Latency Note)
Importance
Abstract
A hot rolled steel strip made by the steps including assembling a twin roll caster, forming a casting pool of molten steel having a free oxygen content between 20 and 75 ppm and having a composition such that the cast strip comprises by weight, greater than 0.1 and not more than 0.5% carbon, between 0.9 and 2.0% manganese, between 0.05 and 0.50% silicon, greater than 0.01% and less than or equal to 0.15% phosphorus, and less than 0.01% aluminum, counter rotating the casting rolls forming the steel strip, hot rolling the strip such that mechanical properties at 10% and 35% reduction are within 10% for yield strength, tensile strength and total elongation, and coiling the strip at a temperature between 300 and 700° C. to provide a majority of the microstructure comprising bainite and acicular ferrite. Alternatively, the steel may have between 0.20 and 0.60% copper and manganese as low as 0.08%.
First Claim
Other Claims data not available