Metal steel production by slab casting
View Patent ↗The present disclosure is directed at metal alloys and methods of processing with application to slab casting methods and post-processing steps towards sheet production. The metals provide unique structure and exhibit advanced property combinations of high strength and/or high ductility.
1. A method comprising:
a. supplying a metal alloy comprising Fe at a level of 61.0 to 88.0 atomic percent, Si at a level of 0.5 to 9.0 atomic percent, Mn at a level of 0.90 to 19.0 atomic percent and optionally B at a level of up to 3.0 atomic percent;
b. melting said alloy and cooling and solidifying and forming an alloy having a thickness of greater than or equal to 20 mm and up to 500 mm and a yield strength of 300 MPa to 600 MPa
wherein said solidified alloy has a melting point (Tm) and heating said alloy to a temperature of 700° C. to below said alloy Tm at a strain rate of 10 −6 to 10 4 and reducing said thickness of said alloy and providing a first resulting alloy having a yield strength of 200 MPa to 1000 MPa and stressing said first resulting alloy and providing a second resulting alloy that has a thickness of 0.1 mm to 25.0 mm and indicates a tensile strength of 400 MPa to 1825 MPa and elongation of 2.4% to 78.1%.
2. The method of claim 1 wherein said first resulting alloy has:
a. grains of 50 nm to 500,000 nm
b. boride grains, if present, of 20 nm to 10,000 nm
c. precipitation grains of 1 nm to 200 nm.
3. The method of claim 1 wherein said second resulting alloy has:
a. grains of 25 nm to 25000 nm
b. boride grains, if present, of 20 nm to 10,000 nm
c. precipitation grains of 1 nm to 200 nm.
4. The method of claim 1 further including one or more of the following:
Ni at a level of 0.1 to 9.0 atomic percent;
Cr at a level of 0.1 to 19.0 atomic percent;
Cu at a level of 0.1 to 4.0 atomic percent; and
C at a level of 0.1 to 4.0 atomic percent.
5. The method of claim 1 wherein said solidified alloy has a melting point Tm and repeatedly heating said alloy to a temperature of 700° C. to below said alloy Tm at a strain rate of 10 −6 to 10 4 and repeatedly reducing said thickness of said alloy during each of said heat treatments.
6. The method of claim 1 wherein said second resulting alloy is positioned in a vehicle.
7. The method of claim 1 wherein said second resulting alloy is positioned in one of a drill collar, drill pipe, pipe casing, tool joint, wellhead, compressed gas storage tank of liquefied natural gas.
8. The method of claim 1 wherein said alloy is a boron-free alloy.