HOT-ROLLED FLAT STEEL PRODUCT AND METHOD FOR THE PRODUCTION THEREOF

• Main Authors: MERTIN CHRISTIAN, FECHTE-HEINEN RAINER, PROCHOTTA SWEN, ESCHER CHRISTINE, PEUSTER ACHIM, SCHAFFNIT ELENA, STOTZEL TIM
• Format: Patent
• Language: Chinese; English
• Published: 16.11.2021
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to a hot-rolled flat steel product with a particularly uniform distribution of its mechanical properties over its length and breadth, having, moreover, good deformability and low tendency to elastic recovery. To this end the flat steel product consists of (in % w/w) C: 0.02 - 0.1 %, Mn: 0.1 - 2.5 %, AI: 0.02 - 0.1 %, Nb: 0.02 - 0.12 %, and optionally of one or more elements of the group, Si, Ti, V, Cr, B, Ca, Mo, with the condition that the Si content is < 0.6 %, the Ti content is < 0.12 %, the V content is < 0.2 %, the Cr content is < 0.2 %, the B content is < 0.0025 %, the Ca content is < 0.01 % and the Mo content is < 0.3 % and the remainder consists of iron and unavoidable impurities, with the impurities including < 0.05 % P, < 0.03 % S, < 0.01 % N, < 0.2 % Ni, < 0.15 % Cu. The microstructure of the flat steel product here is > 60 area percentage ferrite and/or bainite and the remainder is perlite and carbide nitride or carbon nitride precipitations and < 2 area percentage of other m