Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment
DC CAFCFirst Claim
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1. A hot-rolled coated steel sheet comprising a hot-rolled steel sheet coated with an aluminum or aluminum alloy coating, wherein the steel in the sheet comprises the following composition by weight:
- 0.15%<
carbon<
0.5% 0.5%<
manganese<
3% 0.1%<
silicon<
0.5% 0.01%<
chromium<
1% titanium<
0.2% aluminum<
0.1% phosphorus<
0.1% sulfur<
0.05% 0.0005%<
boron<
0.08%, the remainder being iron and impurities inherent in processing, and the steel sheet has a very high mechanical resistance after thermal treatment and the aluminum or aluminum alloy coating provides a high resistance to corrosion of the steel sheet.
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Abstract
Hot-rolled steel sheet which then can be cold-rolled, coated, the steel in the sheet having the following composition by weight:
0.15%<carbon<0.5%
0.5%<manganese<3%
0.1%<silicon<0.5%
0.01%<chromium<1%
titanium<0.2%
aluminum<0.1%
phosphorus<0.1%
sulfur<0.05%
0.0005%<boron<0.08%, the remainder being iron and impurities inherent in processing, the sheet ensuring a very high mechanical resistance after thermal treatment and the aluminum-based coating ensuring a high resistance to corrosion.
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Citations
16 Claims
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1. A hot-rolled coated steel sheet comprising a hot-rolled steel sheet coated with an aluminum or aluminum alloy coating, wherein the steel in the sheet comprises the following composition by weight:
-
0.15%<
carbon<
0.5%0.5%<
manganese<
3%0.1%<
silicon<
0.5%0.01%<
chromium<
1%titanium<
0.2%aluminum<
0.1%phosphorus<
0.1%sulfur<
0.05%0.0005%<
boron<
0.08%, the remainder being iron and impurities inherent in processing, and the steel sheet has a very high mechanical resistance after thermal treatment and the aluminum or aluminum alloy coating provides a high resistance to corrosion of the steel sheet.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
0.20%<
carbon<
0.5%0.8%<
manganese<
1.5%0.1%<
silicon<
0.35%0.01%<
chromium<
1%titanium<
0.1%aluminum<
0.1%phosphorus<
0.05%sulfur<
0.03%0.0005%<
boron<
0.01%, the remainder being iron and impurities inherent in processing.
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3. A heat treated coated steel sheet prepared by subjecting the coated steel sheet according to claim 2, to an increase in temperature at a speed in excess of 600°
- C./second.
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4. A process for producing a casting comprising
shaping the coated steel sheet of claim 2, subjecting the shaped coated steel sheet to an increase in temperature at a speed in excess of 5° - C./sec.
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5. The coated steel sheet according to claim 1, wherein the ratio of titanium to nitrogen in the steel sheet in weight % is in excess of 3.42.
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6. A process for producing a casting comprising
shaping the coated steel sheet of claim 5, subjecting the shaped coated steel sheet to an increase in temperature at a speed in excess of 5° - C./sec.
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7. The coated steel sheet according to claim 1, wherein the aluminum or aluminum alloy coating comprises from 9% to 10% silicon by weight, from 2% to 3.5% iron by weight, the remainder being aluminum.
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8. A process for producing a casting comprising
shaping the coated steel sheet of claim 7, subjecting the shaped coated steel sheet to an increase in temperature at a speed in excess of 5° - C./sec.
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9. The coated steel sheet according to claim 1, wherein the coating comprises from 2% to 4% iron by weight, the remainder being aluminum.
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10. A process for producing a casting comprising
shaping the coated steel sheet of claim 9, subjecting the shaped coated steel sheet to an increase in temperature at a speed in excess of 5° - C./sec.
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11. A process for producing a casting comprising
shaping the coated steel sheet of claim 1, subjecting the shaped coated steel sheet to an increase in temperature at a speed in excess of 5° - C./second.
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12. The process according to claim 11, wherein the casting is heated to a temperature in excess of 750°
- C.
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13. A heat treated coated steel sheet prepared by subjecting the coated steel sheet according to claim 1 to an increase in temperature at a speed in excess of 600°
- C./second.
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14. A land motor vehicle comprising the heat treated coated steel of claim 13.
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15. A land motor vehicle comprising the coated steel sheet of claim 1.
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16. A heat treated coated steel sheet prepared by subjecting the coated steel sheet according to claim 1 to a temperature in excess of 750°
- C.
Specification