Title:
METHOD FOR MANUFACTURING SLAB USING CONTINUOUS CASTING MACHINE
Document Type and Number:
WIPO Patent Application WO/2016/162906
Kind Code:
A1
Abstract:
Provided is a method for manufacturing a slab using a continuous casting machine whereby a slab is obtained in which surface cracking is suppressed without reducing productivity even when molten steel has a prescribed composition. The method for manufacturing a slab has: a step for primary cooling of molten steel, containing 0.13 - 0.20 % by mass C and 0.50% by mass or greater Mn, in a mold; a step for drawing a slab from the mold at a drawing rate of 1.0 m/min or greater; and a step for secondary cooling of the slab that includes reducing the surface temperature of the slab below the Ar3 transformation point and thereafter returning the temperature to be above the Ar3 transformation point. Vibration conditions for the mold satisfy the conditions of a negative strip time Tn of 0.08 - 0.20 seconds and a negative strip time ratio RNS of 0.30 - 0.38, and the time for the surface temperature of the slab to reach the Ar3 transformation point after the slab passes through the mold exceeds 60 seconds.
Inventors:
AWAJIYA YUTAKA (JP)
MIKI YUJI (JP)
NABESHIMA SEIJI (JP)
TSUTSUMI KOICHI (JP)
MIKI YUJI (JP)
NABESHIMA SEIJI (JP)
TSUTSUMI KOICHI (JP)
Application Number:
PCT/JP2015/002963
Publication Date:
October 13, 2016
Filing Date:
June 12, 2015
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B22D11/051; B22D11/00; B22D11/124; B22D11/22
Foreign References:
| JPH09225607A | 1997-09-02 | |||
| JP2015006684A | 2015-01-15 | |||
| JP2008030062A | 2008-02-14 |
Attorney, Agent or Firm:
SUGIMURA, KENJI (JP)
Kenji Sugimura (JP)
Kenji Sugimura (JP)
Download PDF:
Previous Patent: COUPLING NUT AND HOLD-DOWN CONSTRUCTION METHOD
Next Patent: ANTENNAS INCLUDING DUAL RADIATING ELEMENTS FOR WIRELESS ELECTRONIC DEVICES
Next Patent: ANTENNAS INCLUDING DUAL RADIATING ELEMENTS FOR WIRELESS ELECTRONIC DEVICES