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(11) | EP 3 431 201 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | A HOT ROLLED THIN CAST STRIP PRODUCT AND METHOD FOR MAKING THE SAME |
| (57) 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, less
than 0.25% 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 DEG 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%.
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