Continuous casting method for slab made of titanium or titanium alloy

Patent metadata

Field	Value
Publication number	US-9333556-B2
Application number	US-201414646366-A
Country	US
Kind code	B2
Filing date	Jan 23, 2014
Priority date	Jan 23, 2013
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

A continuous casting method in which a molten metal obtained by melting titanium or a titanium alloy is injected into a bottomless mold having a rectangular cross-section and withdrawn downward while being caused to solidify, wherein a plasma torch ( 7 ) is caused to rotate in the horizontal direction above the surface of the molten metal ( 12 ) in the mold ( 2 ), and a horizontally rotating flow is generated by electromagnetic stirring on at least the surface of the molten metal ( 12 ) in the mold ( 2 ). It is thereby possible to cast a slab in which the casting surface condition is excellent.

First claim

The invention claimed is:

1. A continuous casting method for continuously casting a slab made of titanium or a titanium alloy by injecting molten metal having titanium or a titanium alloy melted therein into a bottomless mold having a rectangular cross section and withdrawing the molten metal downward while being solidified,
wherein a plasma torch is configured to horizontally rotate on the surface of the molten metal in the mold,
a horizontally rotating flow is generated by electromagnetic stirring at least on the surface of the molten metal in the mold,
when a length of a long side of the slab is denoted as L and a coordinate axis x is set in the long side direction of the slab, where the origin 0 lies at the central part thereof, in a vicinity of mold walls at long side parts of the mold, absolute values of average values of flow rates in the x-axis direction at the surface of the molten metal located in a range of −2L/5≦x≦2L/5 are set to 300 mm/sec or more, and
the vicinity of the mold walls at the long side parts of the mold is a location 10 mm away from the mold walls at the long side parts of the mold.

2. The continuous casting method for the slab made of titanium or a titanium alloy according to claim 1 , wherein standard deviations σ of the absolute values of the flow rates of the molten metal in the x-axis direction, concerning to variations due to locations and time, are confined in a range of 50 mm/sec≦σ≦85 mm/sec.

3. The continuous casting method for the slab made of titanium or a titanium alloy according to claim 1 , wherein a flow rotating in an opposite direction to a rotational direction of the plasma torch is generated at least on the surface of the molten metal.

4. A continuous casting method for continuously casting a slab made of titanium or a titanium alloy by injecting molten metal having titanium or a titanium alloy melted therein into a bottomless mold having a rectangular cross section and withdrawing the molten metal downward while being solidified,
wherein a plasma torch is configured to horizontally rotate on the surface of the molten metal in the mold,
a horizontally rotating flow is generated by electromagnetic stirring at least on the surface of the molten metal in the mold,
when a length of a long side of the slab is denoted as L and a coordinate axis x is set in the long side direction of the slab, where the origin 0 lies at the central part thereof, in a vicinity of mold walls at long side parts of the mold, absolute values of average values of flow rates in the x-axis direction at the surface of the molten metal located in a range of −2L/5≦x≦2L/5 are set to 300 mm/sec or more, and
standard deviations σ of the absolute values of the flow rates of the molten metal in the x-axis direction, concerning to variations due to locations and time, are confined in a range of 50 mm/sec≦σ≦85 mm/sec.

Assignees

• Kobe Steel Ltd

Inventors

• KUROSAWA Eisuke
• Nakaoka Takehiro
• Tsutsumi Kazuyuki
• Oyama Hideto
• Kanahashi Hidetaka
• Ishida Hitoshi
• Takahashi Daiki
• MATSUWAKA Daisuke

Classifications

• B22D11/041 Primary

  for vertical casting (B22D11/043, B22D11/049 - B22D11/059 take precedence) · CPC title

• B22D27/04

  Influencing the temperature of the metal, e.g. by heating or cooling the mould · CPC title

• B22D27/02

  Use of electric or magnetic effects {(for continuous casting B22D11/015, B22D11/11)} · CPC title

• B22D11/103

  Distributing the molten metal, e.g. using runners, floats, distributors · CPC title

• B22D11/11

  Treating the molten metal · CPC title