Title:
Ｃｒ溶湯の脱炭方法およびＣｒ含有鋼の製造方法
Document Type and Number:
Japanese Patent JP7447878
Kind Code:
B2
Abstract:
To provide a method for decarbonizing Cr molten metal, capable of reducing Cr oxidization loss, and a method for manufacturing Cr containing steel.SOLUTION: A method for decarbonizing Cr containing molten metal using an electric furnace comprises: inserting or throwing and dissolving high carbon ferro-chrome having Cr:55 to 70% and C:4 to 9% on a mass standard into the electric furnace; and setting a decarbonization start temperature Ts to 1535°C or more. A method for decarbonizing the Cr containing molten metal using the electric furnace comprises: calculating a preferential decarbonization temperature Tc(°C) in a Cr concentration [%Cr]=5 to 70 in molten metal and a C concentration [%C]=1 to 10 in the molten metal on a mass standard by the following formula (1); and controlling the decarbonization start temperature Ts(°C) of the Cr containing molten metal to a temperature equal to or more than the preferential decarbonization temperature Tc to start decarbonization. A method for manufacturing Cr containing steel comprises: diluting nor diluting Cr containing molten metal with molten iron to perform finish decarbonization; and controlling a component to perform casting. Tc=2.5×[%Cr]+1365 (1).SELECTED DRAWING: Figure 1
Inventors:
Kaei Nishida
Nobuhiko Oda
Nobuhiko Oda
Application Number:
JP2021125875A
Publication Date:
March 12, 2024
Filing Date:
July 30, 2021
Export Citation:
Assignee:
JFE Steel Corporation
International Classes:
C22C33/04; C21C7/00
Domestic Patent References:
| JP36013704B1 | ||||
| JP8157936A | ||||
| JP2016183385A | ||||
| JP2016194126A | ||||
| JP55079821A |
Attorney, Agent or Firm:
Patent Attorney Ginza Maronnier Patent Office