High-reistant, low-density hot laminated sheet steel and method for the production thereof
AssigneeUsinor
InventorsXavier Bano, Christian Giraud
Life of this patent
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Abstract
The invention relates to a high-resistant, low-density hot laminated sheet steel comprising the following elements expressed in weight per cent: 0.04%:9 carbon≦0.5%; 0.05%≦manganese≦3%, being able to contain hardening elements: 0.01%≦niobium≦0.1 0.01%≦titanium≦0.2% 0.01≦vanadium≦0.2%, either individually or combined, and/or elements acting on the transformation temperatures, 0.0005%≦boron≦0.005%; 0.05%≦nickel≦2%; 0.05%≦chrome≦2%; 0.05%≦molybdenum≦2%, either individually or combined, the remainder being iron and elements which are inherent to production, characterized in that it comprises: 2%≦silicon≦10%; 1%≦aluminium≦10%. The invention also relates to the production thereof.
Claims9
A very-high-strength and low-density, hot-rolled steel sheet, characterized in that its composition in % by weight comprises:
- 0.04%≦carbon≦0.5%
- 0.05%≦manganese≦3%
- and optionally the following hardening elements:
- 0.01%≦niobium≦0.1%
- 0.01%≦titanium≦0.2%
- 0.01%≦vanadium≦0.2%, taken individually or in combination,
- and optionally elements that act on the transformation temperatures:
- 0.0005%≦boron≦0.005%
- 0.05%≦nickel≦2%
- 0.05%≦chromium≦2%
- 0.05%≦molybdenum≦2%, taken individually or in combination,
- the balance being iron and elements inherent in smelting, characterized in that it includes:
- 2%≦silicon≦10%,
- 1%≦aluminum≦10%,
- and in that said sheet further has a microstructure consisting of a primary ferrite phase and of a secondary ferrite phase, the mean grain size of said primary ferrite being greater than the mean grain size of said secondary ferrite, said microstructure also containing carbide phases.
Dependencies are inferred from the claim text.