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US 2007/0175608 A1Published application
Thin cast steel strip with reduced microcracking
AssigneeNucor Corporation
InventorsRama Mahapatra, David Sosinsky
Life of this patent
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Abstract
A thin cast steel strip and method of making thereof with improved resistance to microcracking, where the steel strip is produced by continuous casting and contains between about 0.003% and about 0.008% sulfur by weight and about 0.010% and about 0.065% carbon by weight. The sulfur content may be between about 0.003% and 0.006%.
Claims22
A thin cast steel strip produced by continuous casting by steps comprising:
- a. assembling a pair of internally cooled casting rolls having a nip there between and with confining closures adjacent the ends of the nip;
- b. introducing molten carbon steel having a sulfur content of between about 0.003% and about 0.008% by weight and a carbon content of between about 0.010% and about 0.065% by weight between the pair of casting rolls to form a casting pool supported on the casting surfaces of the casting rolls;
- c. counter rotating the casting rolls to form solidified metal shells on the casting surfaces of the casting rolls;
- and
- d. forming from said solidified shells thin steel strip downwardly through the nip between the casting rolls.
2 more elements
A method of casting thin steel strip comprising:
- a. introducing molten plain carbon steel on casting surfaces of at least one casting roll with the molten steel having a sulfur content between about 0.003% and about 0.008% by weight and a carbon content between about 0.01% and about 0.065% by weight;
- and
- b. solidifying the molten steel to form metal shells on the casting rolls and form thin.
A thin steel strip produced by:
- casting steel strip from molten steel having a sulfur content between about 0.003% and about 0.008% by weight and a carbon content between about 0.010% and about 0.065% by weight.
A method of casting thin steel strip comprising:
- a. assembling a pair of cooled casting rolls having a nip there between and confining end closures adjacent to ends of the casting rolls;
- b. introducing molten plain carbon steel between the pair of casting rolls to form a casting pool on the casting rolls confined by the end closures, with the molten steel having a sulfur content between about 0.003% and about 0.008% by weight and a carbon content between about 0.010% and about 0.065% by weight;
- c. counter-rotating the casting rolls to form solidified metal shells on casting surfaces of the casting rolls;
- and
- d. forming from the solidified metal shells downwardly through the nip between the casting rolls thin steel strip.
2 more elements
A steel composition comprising:
- a. a carbon content of between about 0.010% and about 0.065% by weight, a silicon content of 2.5% by weight or less, a manganese content of 2.0% by weight or less, and an aluminum content of 1.0% by weight or less;
- and
- b. a component to reduce the formation of surface microcracks in the cast thin strip, the component comprising a sulfur content between about 0.003% and about 0.008% by weight.
Dependencies are inferred from the claim text.