Title:
METHOD OF SUPPRESSING SURFACE FLAW ON STEEL SHEET AND CONTINUOUS ANNEALING FURNACE
Document Type and Number:
Japanese Patent JP2018159134
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a method for suppressing pickup flaws (surface flaws) on a cold-rolled steel sheet.SOLUTION: In the method of suppressing surface flaw on a steel sheet in a continuous annealing furnace in which a steel sheet strip is annealed while being rolled to be fed, the oxygen partial pressure in the furnace is set to equal to or lower than the equilibrium oxygen partial pressure of Fe/FeO. The oxygen partial pressure P(atm) in a part where at least one feeding roll and the steel sheet strip approach each other and the surface temperature T(°C) of the feeding roll satisfy the following formula (1). T≤36.4×ln(10×P)+1020...(1)SELECTED DRAWING: Figure 2
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Inventors:
NAKAKUBO SHOHEI
TAKEDA MIKAKO
KOIZUMI SHIGETO
NAGASE YOSHIYUKI
TAKEDA MIKAKO
KOIZUMI SHIGETO
NAGASE YOSHIYUKI
Application Number:
JP2018115235A
Publication Date:
October 11, 2018
Filing Date:
June 18, 2018
Export Citation:
Assignee:
KOBE STEEL LTD
International Classes:
C21D9/56; C21D9/46; C22C38/06
Attorney, Agent or Firm:
Patent business corporation glory patent office