METHOD OF PRODUCING CONTINUOUSLY CAST PIECES OF STEEL

Title:

METHOD OF PRODUCING CONTINUOUSLY CAST PIECES OF STEEL

Document Type and Number:

WIPO Patent Application WO/2002/090971

Kind Code:

A1

Abstract:

A method of producing continuously cast pieces of steel, using a method of measuring the solidified state of continuously cast pieces by means of a sensor placed out of contact with the cast piece, comprising the steps of measuring the solidified state of the cast piece along the casting direction, detecting the position of the crater end from the measured solidified state, and controlling at least one condition selected from the conditions consisting of casting speed and secondary cooling water quantity on the basis of the position of the detected crater end, wherein the method of measuring the solidified state of the cast piece comprises the steps of cooling the cast piece until the surface layer undergoes a-transformation, transmitting the transverse waves in electromagnetic ultrasonic waves to the cooled cast piece, receiving the signal after it has penetrated the cast piece, and determining the solidified state on the basis of the received signal.

Inventors:

IIZUKA YUKINORI (JP)
AWAJIYA YUTAKA (JP)
NAKADA MASAYUKI (JP)
SUZUKI MAKOTO (JP)
TSUTSUMI KOICHI (JP)

Application Number:

PCT/JP2001/010428

Publication Date:

November 14, 2002

Filing Date:

November 29, 2001

Export Citation:

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Assignee:

NIPPON KOKAN KK (JP)
IIZUKA YUKINORI (JP)
AWAJIYA YUTAKA (JP)
NAKADA MASAYUKI (JP)
SUZUKI MAKOTO (JP)
TSUTSUMI KOICHI (JP)

International Classes:

B22D11/16; B22D11/20; B22D11/22; G01B17/00; G01N29/24; G01N29/34; G01N29/50; (IPC1-7): G01N29/08; B22D11/16

Foreign References:

JPS52130422A	1977-11-01
JPS5357088A	1978-05-24
JPS6137356A	1986-02-22
JPH09174213A	1997-07-08
JPS5773670A	1982-05-08
JPS60100758A	1985-06-04
JP2000266730A	2000-09-29

Other References: