US 12,331,369 B2
Method for producing conventionally hot-rolled profiled strip products
Wolfgang Ernst, Linz (AT); and Helmut Spindler, Oed-Öhling (AT)
Assigned to VOESTALPINE STAHL GMBH, Linz (AT)
Appl. No. 17/413,435
Filed by voestalpine Stahl GmbH, Linz (AT)
PCT Filed Dec. 18, 2019, PCT No. PCT/EP2019/086062
§ 371(c)(1), (2) Date Jan. 14, 2022,
PCT Pub. No. WO2020/127561, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 10 2018 132 860.5 (DE), filed on Dec. 19, 2018.
Prior Publication US 2022/0145414 A1, May 12, 2022
Int. Cl. C21D 8/02 (2006.01); C21D 1/02 (2006.01); C21D 1/18 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01)
CPC C21D 8/0226 (2013.01) [C21D 1/02 (2013.01); C21D 1/18 (2013.01); C21D 8/0263 (2013.01); C21D 8/0273 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C21D 2211/001 (2013.01); C21D 2211/008 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A method for producing hot-rolled hot strip products, comprising the steps of:
providing a steel alloy including the following elements, in percent by weight:
0.03 to 0.22% carbon,
0.0 to 2.0% silicon,
0.5 to 3.0% manganese,
0.02 to 1.2% aluminum,
0 to 2.0% chromium,
0 to 2.0% nickel,
0.0 to 1.0% molybdenum,
0.0 to 1.5% copper,
0 to 0.02% phosphorus,
0 to 0.01% sulfur,
0 to 0.008% nitrogen,
0 to 0.005% boron,
0.0 to 0.2% niobium,
0.0 to 0.3% titanium,
0.0 to 0.5% vanadium,
the remainder being comprised of iron and smelting-related impurities melting the steel alloy;
casting the melted steel alloy into slab ingots;
heating the slab ingots to a temperature above Ac3;
hot rolling the slab ingots to produce steel strips having a desired degree of deformation and a desired strip thickness, the rolling being performed above a recrystallization temperature of the alloy;
cooling the steel strips to room temperature;
after cooling the steel strips to room temperature, hardening the steel strips by heating the steel strips to a temperature >Ac3 and cooling the steel strips again to form hardened steel strips;
wherein the heating of the steel strips takes place with a temperature increase of more than 5 K/s, and the steel strips are kept at a desired target temperature for a holding period of 0.5 to 60s prior to cooling and an optional annealing; and
after hardening the steel strips, profiling the steel strips into one or more components using a forming process.