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(BR112013028931) The present invention provides a method for the fabrication of a steel sheet with a completely martensitic structure which has an average lath size of less than 1 micrometer and an average elongation factor of the laths is between 2 and 5.The elongation factor of a lath is defined as a maximum dimension divided by and a minimum dimension 1max.The steel sheet has a yield stress greater than 1300 MPa and a mechanical strength greater than (3220(C)+958) megapascals.A composition of a semi-finished steel product includes, expressed in percent by weight, is, 0.15%≰C≰0.40%, 1.5%≰Mn≰3%, 0.005%≰Si≰2%, 0.005%≰Al≰0.1%, 1.8%≰Cr≰4%, 0%≰Mo≰2%, whereby: 2.7%≰0.5 (Mn)+(Cr)+3(Mo)≰5.7%, S≰0.05%, P≰0.1%, optionally: 0%≰Nb≰0.050%, 0.01%≰Ti≰0.1%, 0.0005%≰B≰0.005%, 0.0005%≰Ca≰0.005%.The semi-finished product is reheated to a temperature T1 in the range between 1050° C. and 1250° C., then subjected to a roughing rolling at a temperature T2 in the range between 1000 and 880° C., with a cumulative rate of reduction εa greater than 30%, to obtain a sheet with a completely recrystallized austenitic structure with an average grain size less than 40 micrometers and preferably less than 5 micrometers.The sheet is then partially cooled to prevent a transformation of the austenite at a rate VR1 greater than 2° C./s to a temperature T3 between 600° C. and 400° C. in the metastable austenitic range, and subjected to a finishing hot rolling at the temperature T3 of the partially cooled sheet, with a cumulative rate of reduction εb greater than 30% to obtain a sheet that is then cooled at a rate VR2 which is greater than the critical martensitic quenching rate. (From US2014076470 A1)
(BR112014012756) A dual phase steel (martensite+ferrite) having a tensile strength of at least 980 MPa, and a total elongation of at least 15%.The dual phase steel may have a total elongation of at least 18%.The dual phase steel may also have a tensile strength of at least 1180 MPa.The dual phase steel may include between 0.5-3.5 wt. % Si, and more preferably between 1.5-2.5 wt. % Si. (From US2015267280 A1)
(KR101950079) Method of this invention, phase of at least next:- Boat [ssu] (bath) to D (dipping) will be board (3) dizzily, has if two, (5) becomes coating steel board (3) as for under providing phase,- To on external ostensible (15) of metal coating (7) between 1 and 4 the acid solution which has the ph which is included as for under applying phase, and- Adhesives (13) the low of applying a phase included locally to on at least one external ostensible (15) of metal coating (7).
(US10207743) The automotive vehicle structural part (30) includes at least a main panel (40) and a wheel casing (42), the main panel (40) and the wheel casing (42) being made of two distinct three-dimensional parts made of different materials attached to each other by welding.
(US10203194) A method and device for measuring the thickness of a coating material layer of a running strip according to which, by means of an eddy current sensor for at least one area of the strip, a quantity is measured, representative of the thickness of the coating layer and the thickness of the coating layer is determined from the measured quantity and from at least one calibration value.The measurement made with an eddy current sensor comprises the measurement of the complex impedance of a coil facing the running strip for a low excitation frequency and a high excitation frequency and the elaboration of a quantity representative of the thickness of the coating layer from said complex impedance measurements.A device for applying the method and a coating installation equipped with the device.