METHOD FOR PRODUCING A SHEET STEEL PRODUCT, SHEET STEEL PRODUCT, AND USE OF SUCH A SHEET STEEL PRODUCT

According to the invention, to produce sheet steel products which are suitable for forming into sheet metal parts and can be welded well, a) a steel melt is melted, which consists of, in wt%, C: 0.10-0.4, Si: 0.05-0.5, Mn: 0.5-3.0, AI: 0.01-0.2, Cr: 0.005-1.0, V: 0.001-0.2, and optionally one or mor...

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Bibliographische Detailangaben
Hauptverfasser: KÖYER, Maria, LINKE, Bernd, BANIK, Janko, ROSENSTOCK, Dirk, BÄUMER, Annette, MATTISSEN, Dorothea
Format: Patent
Sprache:eng ; fre ; ger
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Zusammenfassung:According to the invention, to produce sheet steel products which are suitable for forming into sheet metal parts and can be welded well, a) a steel melt is melted, which consists of, in wt%, C: 0.10-0.4, Si: 0.05-0.5, Mn: 0.5-3.0, AI: 0.01-0.2, Cr: 0.005-1.0, V: 0.001-0.2, and optionally one or more elements from the group "B, Ti, Nb, Ni, Cu, Mo, W" in the following amounts, B: 0.0005-0.01, Ti: 0.001-0.1, Nb: 0.001-0.1, Ni: 0.01-0.4, Cu: 0.01-0.8, Mo: 0.002-1.0, W: 0.001-1.0, the remainder Fe and unavoidable impurities. The melt is b) poured into a tundish, out of which the melt flows into a continuous casting mould to form a strand, wherein, when poured into the tundish, the melt has a superheat temperature TUE which is 5-60°C higher than the liquidus temperature thereof, and the following applies for the product a formed from a thickness Ds of the strand and a pouring speed Vs at which the melt flows into the continuous casting mould: amin < a < amax (where amin - 0.05 m2/min, amax - 0.7 m2/min, Ds: 20-500 mm). c) A slab or thin slab is separated off from the strand and is then d) heated through at a temperature of 1100-1400°C. The heated slab or thin slab is hot-rolled to form a sheet steel product at a final rolling temperature of 750-1000°C. Following any optional reeling, descaling and cold-rolling, the sheet steel product is annealed at an annealing temperature of 650-900°C. It is then cooled to room temperature, the cooling taking place from 600°C to 450°C at an average cooling rate (CR1) ≤ 25 K/s and from 400°C to 220°C at an average cooling rate (CR2) ≤ 20 K/s. The invention also relates to a sheet steel product having an optimal property profile for forming.