公开(公告)号：US20200033268A1

公开(公告)日：2020-01-30

申请号：US16484615

申请日：2018-04-25

Applicant: NIPPON STEEL CORPORATION

Inventor： Masato SUGIURA ,  Hiroshi TANEI ,  Shuichi YAMAZAKI ,  Yasumitsu KONDO

IPC: G01N21/71 ,  G01N33/2028

Abstract: A scale composition determination device (10) determines that Fe2O3 has been generated in the outermost layer of a scale (SC) in the case where at least one of spectral emissivities at one wavelength and the other wavelength that are measured by radiometers for spectral emissivity measurement (21a, 21b) is not within a predetermined range including spectral emissivities of FeO at one wavelength and the other wavelength, and determines that Fe2O3 has not been generated in the outermost layer of the scale (SC) in the case where all of the spectral emissivities at one wavelength and the other wavelength that are measured by the radiometers for spectral emissivity measurement (21a, 21b) is within the predetermined range including the spectral emissivities of FeO at one wavelength and the other wavelength.

公开(公告)号：US20230400298A1

公开(公告)日：2023-12-14

申请号：US18033387

申请日：2021-11-02

Applicant: NIPPON STEEL CORPORATION

Inventor： Tooru AKASHI ,  Keita IKEDA ,  Yasumitsu KONDO ,  Naoki INOUE ,  Akinobu MINAMI

IPC: G01B21/08

CPC classification number: G01B21/085

Abstract: This internal oxide layer thickness estimation device estimates a thickness of an internal oxide layer formed in a hot-rolled steel sheet. The internal oxide layer thickness estimation device includes: a first temperature definition unit that defines a temperature of a portion to be estimated, in which the thickness of the internal oxide layer is to be estimated, in the hot-rolled steel sheet; a second temperature definition unit that defines an internal oxidation starting temperature at which internal oxidation of the hot-rolled steel sheet starts; a cumulative temperature calculation unit that calculates a cumulative temperature on the basis of the temperatures defined by the first temperature definition unit and the second temperature definition unit and a predetermined period of time from an estimation start time at which estimation of the thickness of the internal oxide layer is started to an estimation evaluation time; a first correlation expression derivation unit that derives a first correlation expression indicating a correlation between the cumulative temperature calculated by the cumulative temperature calculation unit and an estimated value of the thickness of the internal oxide layer; and an internal oxide layer thickness estimation unit that estimates the thickness of the internal oxide layer on the basis of the first correlation expression.

公开(公告)号：US20230296579A1

公开(公告)日：2023-09-21

申请号：US18034628

申请日：2021-11-02

Applicant: NIPPON STEEL CORPORATION

Inventor： Keita IKEDA ,  Tooru AKASHI ,  Yasumitsu KONDO

IPC: G01N33/2028 ,  B21B3/02 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02

CPC classification number: G01N33/2028 ,  B21B3/02 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02

Abstract: An internal oxidation starting temperature, estimation device estimates an internal oxidation starting temperature which is a minimum temperature required for an internal oxide layer to grow on a surface of an easily oxidizable element-containing hot-rolled steel sheet including Si, Mn, or Al or any combination thereof. The internal oxidation starting temperature estimation device includes an internal, oxidation starting temperature estimation unit that estimates the internal oxidation starting temperature on the basis of concentrations of the Si, the Mn, and the Al included in the easily oxidizable element-containing hot-rolled steel sheet.

公开(公告)号：US20210247235A1

公开(公告)日：2021-08-12

申请号：US17243875

申请日：2021-04-29

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroshi TANEI ,  Masato SUGIURA ,  Shuichi YAMAZAKI ,  Yasumitsu KONDO

IPC: G01J5/00 ,  B21C51/00

Abstract: A scale composition determination device (10) determines that Fe2O3 has been generated in the outermost layer of a scale (SC) in the case where the absolute value of a difference between temperatures of a steel material SM measured by radiation thermometers (20a, 20b) is equal to or more than a predetermined temperature, and determines that Fe2O3 has not been generated in the outermost layer of the scale (SC) in the case where the absolute value of the difference between the temperatures of the steel material SM measured by the radiation thermometers (20a, 20b) is not equal to or more than the predetermined temperature.